pcb_point_editor.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2013-2021 CERN
 * Copyright (C) 2018-2023 KiCad Developers, see AUTHORS.txt for contributors.
 * @author Maciej Suminski <[email protected]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
#include <functional>
#include <memory>
 
using namespace std::placeholders;
#include <advanced_config.h>
#include <tool/tool_manager.h>
#include <view/view_controls.h>
#include <geometry/seg.h>
#include <confirm.h>
#include <tools/pcb_actions.h>
#include <tools/pcb_selection_tool.h>
#include <tools/pcb_point_editor.h>
#include <tools/pcb_grid_helper.h>
#include <board_commit.h>
#include <pcb_edit_frame.h>
#include <fp_shape.h>
#include <fp_textbox.h>
#include <pcb_bitmap.h>
#include <pcb_dimension.h>
#include <pcb_textbox.h>
#include <pad.h>
#include <zone.h>
#include <footprint.h>
#include <footprint_editor_settings.h>
#include <connectivity/connectivity_data.h>
#include <progress_reporter.h>
 
const unsigned int PCB_POINT_EDITOR::COORDS_PADDING = pcbIUScale.mmToIU( 20 );
 
// Few constants to avoid using bare numbers for point indices
enum SEG_POINTS
{
 SEG_START, SEG_END
};
 
 
enum RECT_POINTS
{
 RECT_TOP_LEFT, RECT_TOP_RIGHT, RECT_BOT_RIGHT, RECT_BOT_LEFT
};
 
 
enum RECT_LINES
{
 RECT_TOP, RECT_RIGHT, RECT_BOT, RECT_LEFT
};
 
 
enum ARC_POINTS
{
 ARC_CENTER, ARC_START, ARC_MID, ARC_END
};
 
 
enum CIRCLE_POINTS
{
 CIRC_CENTER, CIRC_END
};
 
 
enum BEZIER_CURVE_POINTS
{
 BEZIER_CURVE_START,
 BEZIER_CURVE_CONTROL_POINT1,
 BEZIER_CURVE_CONTROL_POINT2,
 BEZIER_CURVE_END
};
 
 
enum DIMENSION_POINTS
{
 DIM_START,
 DIM_END,
 DIM_TEXT,
 DIM_CROSSBARSTART,
 DIM_CROSSBAREND,
 DIM_KNEE = DIM_CROSSBARSTART
};
 
 
PCB_POINT_EDITOR::PCB_POINT_EDITOR() :
 PCB_TOOL_BASE( "pcbnew.PointEditor" ),
 m_selectionTool( nullptr ),
 m_editedPoint( nullptr ),
 m_hoveredPoint( nullptr ),
 m_original( VECTOR2I( 0, 0 ) ),
 m_refill( false ),
 m_arcEditMode( ARC_EDIT_MODE::KEEP_CENTER_ADJUST_ANGLE_RADIUS ),
 m_altConstrainer( VECTOR2I( 0, 0 ) )
{
}
 
 
void PCB_POINT_EDITOR::Reset( RESET_REASON aReason )
{
 m_refill = false;
 m_editPoints.reset();
 m_altConstraint.reset();
 getViewControls()->SetAutoPan( false );
}
 
 
bool PCB_POINT_EDITOR::Init()
{
 // Find the selection tool, so they can cooperate
 m_selectionTool = m_toolMgr->GetTool<PCB_SELECTION_TOOL>();
 
 wxASSERT_MSG( m_selectionTool, wxT( "pcbnew.InteractiveSelection tool is not available" ) );
 
 auto& menu = m_selectionTool->GetToolMenu().GetMenu();
 menu.AddItem( PCB_ACTIONS::pointEditorAddCorner, PCB_POINT_EDITOR::addCornerCondition );
 menu.AddItem( PCB_ACTIONS::pointEditorRemoveCorner,
 std::bind( &PCB_POINT_EDITOR::removeCornerCondition, this, _1 ) );
 
 return true;
}
 
 
void PCB_POINT_EDITOR::buildForPolyOutline( std::shared_ptr<EDIT_POINTS> points,
 const SHAPE_POLY_SET* aOutline )
{
 int cornersCount = aOutline->TotalVertices();
 
 for( auto iterator = aOutline->CIterateWithHoles(); iterator; iterator++ )
 {
 points->AddPoint( *iterator );
 
 if( iterator.IsEndContour() )
 points->AddBreak();
 }
 
 // Lines have to be added after creating edit points, as they use EDIT_POINT references
 for( int i = 0; i < cornersCount - 1; ++i )
 {
 if( points->IsContourEnd( i ) )
 points->AddLine( points->Point( i ), points->Point( points->GetContourStartIdx( i ) ) );
 else
 points->AddLine( points->Point( i ), points->Point( i + 1 ) );
 
 points->Line( i ).SetConstraint( new EC_PERPLINE( points->Line( i ) ) );
 }
 
 // The last missing line, connecting the last and the first polygon point
 points->AddLine( points->Point( cornersCount - 1 ),
 points->Point( points->GetContourStartIdx( cornersCount - 1 ) ) );
 
 points->Line( points->LinesSize() - 1 )
 .SetConstraint( new EC_PERPLINE( points->Line( points->LinesSize() - 1 ) ) );
}
 
 
std::shared_ptr<EDIT_POINTS> PCB_POINT_EDITOR::makePoints( EDA_ITEM* aItem )
{
 std::shared_ptr<EDIT_POINTS> points = std::make_shared<EDIT_POINTS>( aItem );
 
 if( !aItem )
 return points;
 
 if( aItem->Type() == PCB_TEXTBOX_T || aItem->Type() == PCB_FP_TEXTBOX_T )
 {
 const PCB_SHAPE* shape = static_cast<const PCB_SHAPE*>( aItem );
 
 // We can't currently handle TEXTBOXes that have been turned into SHAPE_T::POLYs due
 // to non-cardinal rotations
 if( shape->GetShape() != SHAPE_T::RECT )
 return points;
 }
 
 // Generate list of edit points basing on the item type
 switch( aItem->Type() )
 {
 case PCB_BITMAP_T:
 {
 PCB_BITMAP* bitmap = (PCB_BITMAP*) aItem;
 VECTOR2I topLeft = bitmap->GetPosition() - bitmap->GetSize() / 2;
 VECTOR2I botRight = bitmap->GetPosition() + bitmap->GetSize() / 2;
 
 points->AddPoint( topLeft );
 points->AddPoint( VECTOR2I( botRight.x, topLeft.y ) );
 points->AddPoint( botRight );
 points->AddPoint( VECTOR2I( topLeft.x, botRight.y ) );
 
 break;
 }
 
 case PCB_TEXTBOX_T:
 case PCB_FP_TEXTBOX_T:
 case PCB_SHAPE_T:
 case PCB_FP_SHAPE_T:
 {
 const PCB_SHAPE* shape = static_cast<const PCB_SHAPE*>( aItem );
 
 switch( shape->GetShape() )
 {
 case SHAPE_T::SEGMENT:
 points->AddPoint( shape->GetStart() );
 points->AddPoint( shape->GetEnd() );
 break;
 
 case SHAPE_T::RECT:
 points->AddPoint( shape->GetTopLeft() );
 points->AddPoint( VECTOR2I( shape->GetBotRight().x, shape->GetTopLeft().y ) );
 points->AddPoint( shape->GetBotRight() );
 points->AddPoint( VECTOR2I( shape->GetTopLeft().x, shape->GetBotRight().y ) );
 
 points->AddLine( points->Point( RECT_TOP_LEFT ), points->Point( RECT_TOP_RIGHT ) );
 points->Line( RECT_TOP ).SetConstraint( new EC_PERPLINE( points->Line( RECT_TOP ) ) );
 points->AddLine( points->Point( RECT_TOP_RIGHT ), points->Point( RECT_BOT_RIGHT ) );
 points->Line( RECT_RIGHT ).SetConstraint( new EC_PERPLINE( points->Line( RECT_RIGHT ) ) );
 points->AddLine( points->Point( RECT_BOT_RIGHT ), points->Point( RECT_BOT_LEFT ) );
 points->Line( RECT_BOT ).SetConstraint( new EC_PERPLINE( points->Line( RECT_BOT ) ) );
 points->AddLine( points->Point( RECT_BOT_LEFT ), points->Point( RECT_TOP_LEFT ) );
 points->Line( RECT_LEFT ).SetConstraint( new EC_PERPLINE( points->Line( RECT_LEFT ) ) );
 
 break;
 
 case SHAPE_T::ARC:
 points->AddPoint( shape->GetCenter() );
 points->AddPoint( shape->GetStart() );
 points->AddPoint( shape->GetArcMid() );
 points->AddPoint( shape->GetEnd() );
 break;
 
 case SHAPE_T::CIRCLE:
 points->AddPoint( shape->GetCenter() );
 points->AddPoint( shape->GetEnd() );
 break;
 
 case SHAPE_T::POLY:
 buildForPolyOutline( points, &shape->GetPolyShape() );
 break;
 
 case SHAPE_T::BEZIER:
 points->AddPoint( shape->GetStart() );
 points->AddPoint( shape->GetBezierC1() );
 points->AddPoint( shape->GetBezierC2() );
 points->AddPoint( shape->GetEnd() );
 break;
 
 default: // suppress warnings
 break;
 }
 
 break;
 }
 
 case PCB_PAD_T:
 {
 const PAD* pad = static_cast<const PAD*>( aItem );
 VECTOR2I shapePos = pad->ShapePos();
 VECTOR2I halfSize( pad->GetSize().x / 2, pad->GetSize().y / 2 );
 
 if( !m_isFootprintEditor || pad->IsLocked() )
 break;
 
 switch( pad->GetShape() )
 {
 case PAD_SHAPE::CIRCLE:
 points->AddPoint( VECTOR2I( shapePos.x + halfSize.x, shapePos.y ) );
 break;
 
 case PAD_SHAPE::OVAL:
 case PAD_SHAPE::TRAPEZOID:
 case PAD_SHAPE::RECT:
 case PAD_SHAPE::ROUNDRECT:
 case PAD_SHAPE::CHAMFERED_RECT:
 {
 if( !pad->GetOrientation().IsCardinal() )
 break;
 
 if( pad->GetOrientation() == ANGLE_90 || pad->GetOrientation() == ANGLE_270 )
 std::swap( halfSize.x, halfSize.y );
 
 points->AddPoint( shapePos - halfSize );
 points->AddPoint( VECTOR2I( shapePos.x + halfSize.x, shapePos.y - halfSize.y ) );
 points->AddPoint( shapePos + halfSize );
 points->AddPoint( VECTOR2I( shapePos.x - halfSize.x, shapePos.y + halfSize.y ) );
 }
 break;
 
 default: // suppress warnings
 break;
 }
 }
 break;
 
 case PCB_FP_ZONE_T:
 case PCB_ZONE_T:
 {
 const ZONE* zone = static_cast<const ZONE*>( aItem );
 buildForPolyOutline( points, zone->Outline() );
 }
 break;
 
 case PCB_DIM_ALIGNED_T:
 case PCB_DIM_ORTHOGONAL_T:
 case PCB_FP_DIM_ALIGNED_T:
 case PCB_FP_DIM_ORTHOGONAL_T:
 {
 const PCB_DIM_ALIGNED* dimension = static_cast<const PCB_DIM_ALIGNED*>( aItem );
 
 points->AddPoint( dimension->GetStart() );
 points->AddPoint( dimension->GetEnd() );
 points->AddPoint( dimension->GetTextPos() );
 points->AddPoint( dimension->GetCrossbarStart() );
 points->AddPoint( dimension->GetCrossbarEnd() );
 
 points->Point( DIM_START ).SetSnapConstraint( ALL_LAYERS );
 points->Point( DIM_END ).SetSnapConstraint( ALL_LAYERS );
 
 if( aItem->Type() == PCB_DIM_ALIGNED_T )
 {
 // Dimension height setting - edit points should move only along the feature lines
 points->Point( DIM_CROSSBARSTART )
 .SetConstraint( new EC_LINE( points->Point( DIM_CROSSBARSTART ),
 points->Point( DIM_START ) ) );
 points->Point( DIM_CROSSBAREND )
 .SetConstraint( new EC_LINE( points->Point( DIM_CROSSBAREND ),
 points->Point( DIM_END ) ) );
 }
 
 break;
 }
 
 case PCB_DIM_CENTER_T:
 case PCB_FP_DIM_CENTER_T:
 {
 const PCB_DIM_CENTER* dimension = static_cast<const PCB_DIM_CENTER*>( aItem );
 
 points->AddPoint( dimension->GetStart() );
 points->AddPoint( dimension->GetEnd() );
 
 points->Point( DIM_START ).SetSnapConstraint( ALL_LAYERS );
 
 points->Point( DIM_END ).SetConstraint( new EC_45DEGREE( points->Point( DIM_END ),
 points->Point( DIM_START ) ) );
 points->Point( DIM_END ).SetSnapConstraint( IGNORE_SNAPS );
 
 break;
 }
 
 case PCB_DIM_RADIAL_T:
 case PCB_FP_DIM_RADIAL_T:
 {
 const PCB_DIM_RADIAL* dimension = static_cast<const PCB_DIM_RADIAL*>( aItem );
 
 points->AddPoint( dimension->GetStart() );
 points->AddPoint( dimension->GetEnd() );
 points->AddPoint( dimension->GetTextPos() );
 points->AddPoint( dimension->GetKnee() );
 
 points->Point( DIM_START ).SetSnapConstraint( ALL_LAYERS );
 points->Point( DIM_END ).SetSnapConstraint( ALL_LAYERS );
 
 points->Point( DIM_KNEE ).SetConstraint( new EC_LINE( points->Point( DIM_START ),
 points->Point( DIM_END ) ) );
 points->Point( DIM_KNEE ).SetSnapConstraint( IGNORE_SNAPS );
 
 points->Point( DIM_TEXT ).SetConstraint( new EC_45DEGREE( points->Point( DIM_TEXT ),
 points->Point( DIM_KNEE ) ) );
 points->Point( DIM_TEXT ).SetSnapConstraint( IGNORE_SNAPS );
 
 break;
 }
 
 case PCB_DIM_LEADER_T:
 case PCB_FP_DIM_LEADER_T:
 {
 const PCB_DIM_LEADER* dimension = static_cast<const PCB_DIM_LEADER*>( aItem );
 
 points->AddPoint( dimension->GetStart() );
 points->AddPoint( dimension->GetEnd() );
 points->AddPoint( dimension->GetTextPos() );
 
 points->Point( DIM_START ).SetSnapConstraint( ALL_LAYERS );
 points->Point( DIM_END ).SetSnapConstraint( ALL_LAYERS );
 
 points->Point( DIM_TEXT ).SetConstraint( new EC_45DEGREE( points->Point( DIM_TEXT ),
 points->Point( DIM_END ) ) );
 points->Point( DIM_TEXT ).SetSnapConstraint( IGNORE_SNAPS );
 
 break;
 }
 
 default:
 points.reset();
 break;
 }
 
 return points;
}
 
 
void PCB_POINT_EDITOR::updateEditedPoint( const TOOL_EVENT& aEvent )
{
 EDIT_POINT* point;
 EDIT_POINT* hovered = nullptr;
 
 if( aEvent.IsMotion() )
 {
 point = m_editPoints->FindPoint( aEvent.Position(), getView() );
 hovered = point;
 }
 else if( aEvent.IsDrag( BUT_LEFT ) )
 {
 point = m_editPoints->FindPoint( aEvent.DragOrigin(), getView() );
 }
 else
 {
 point = m_editPoints->FindPoint( getViewControls()->GetCursorPosition(), getView() );
 }
 
 if( hovered )
 {
 if( m_hoveredPoint != hovered )
 {
 if( m_hoveredPoint )
 m_hoveredPoint->SetHover( false );
 
 m_hoveredPoint = hovered;
 m_hoveredPoint->SetHover();
 }
 }
 else if( m_hoveredPoint )
 {
 m_hoveredPoint->SetHover( false );
 m_hoveredPoint = nullptr;
 }
 
 if( m_editedPoint != point )
 setEditedPoint( point );
}
 
 
int PCB_POINT_EDITOR::OnSelectionChange( const TOOL_EVENT& aEvent )
{
 if( !m_selectionTool || aEvent.Matches( EVENTS::InhibitSelectionEditing ) )
 return 0;
 
 PCB_BASE_EDIT_FRAME* editFrame = getEditFrame<PCB_BASE_EDIT_FRAME>();
 const PCB_SELECTION& selection = m_selectionTool->GetSelection();
 
 if( selection.Size() != 1 || selection.Front()->GetEditFlags() )
 return 0;
 
 BOARD_ITEM* item = static_cast<BOARD_ITEM*>( selection.Front() );
 
 if( !item || item->IsLocked() )
 return 0;
 
 Activate();
 // Must be done after Activate() so that it gets set into the correct context
 getViewControls()->ShowCursor( true );
 
 PCB_GRID_HELPER grid( m_toolMgr, editFrame->GetMagneticItemsSettings() );
 m_editPoints = makePoints( item );
 
 if( !m_editPoints )
 return 0;
 
 getView()->Add( m_editPoints.get() );
 setEditedPoint( nullptr );
 updateEditedPoint( aEvent );
 m_refill = false;
 bool inDrag = false;
 bool useAltContraint = false;
 
 BOARD_COMMIT commit( editFrame );
 
 // Main loop: keep receiving events
 while( TOOL_EVENT* evt = Wait() )
 {
 grid.SetSnap( !evt->Modifier( MD_SHIFT ) );
 grid.SetUseGrid( getView()->GetGAL()->GetGridSnapping() && !evt->DisableGridSnapping() );
 
 if( editFrame->IsType( FRAME_PCB_EDITOR ) )
 {
 useAltContraint = editFrame->GetPcbNewSettings()->m_Use45DegreeLimit;
 m_arcEditMode = editFrame->GetPcbNewSettings()->m_ArcEditMode;
 }
 else
 {
 useAltContraint = editFrame->GetFootprintEditorSettings()->m_Use45Limit;
 m_arcEditMode = editFrame->GetFootprintEditorSettings()->m_ArcEditMode;
 }
 
 if( !m_editPoints || evt->IsSelectionEvent() ||
 evt->Matches( EVENTS::InhibitSelectionEditing ) )
 {
 break;
 }
 
 EDIT_POINT* prevHover = m_hoveredPoint;
 
 if( !inDrag )
 updateEditedPoint( *evt );
 
 if( prevHover != m_hoveredPoint )
 getView()->Update( m_editPoints.get() );
 
 if( evt->IsDrag( BUT_LEFT ) && m_editedPoint )
 {
 if( !inDrag )
 {
 frame()->UndoRedoBlock( true );
 
 commit.StageItems( selection, CHT_MODIFY );
 
 getViewControls()->ForceCursorPosition( false );
 m_original = *m_editedPoint; // Save the original position
 getViewControls()->SetAutoPan( true );
 inDrag = true;
 
 if( m_editedPoint->GetGridConstraint() != SNAP_BY_GRID )
 grid.SetAuxAxes( true, m_original.GetPosition() );
 
 setAltConstraint( true );
 m_editedPoint->SetActive();
 
 for( size_t ii = 0; ii < m_editPoints->PointsSize(); ++ii )
 {
 EDIT_POINT& point = m_editPoints->Point( ii );
 
 if( &point != m_editedPoint )
 point.SetActive( false );
 }
 }
 
 // Keep point inside of limits with some padding
 VECTOR2I pos = GetClampedCoords<double, int>( evt->Position(), COORDS_PADDING );
 LSET snapLayers;
 
 switch( m_editedPoint->GetSnapConstraint() )
 {
 case IGNORE_SNAPS: break;
 case OBJECT_LAYERS: snapLayers = item->GetLayerSet(); break;
 case ALL_LAYERS: snapLayers = LSET::AllLayersMask(); break;
 }
 
 if( m_editedPoint->GetGridConstraint() == SNAP_BY_GRID )
 {
 if( grid.GetUseGrid() )
 {
 VECTOR2I gridPt = grid.BestSnapAnchor( pos, {}, { item } );
 
 VECTOR2I last = m_editedPoint->GetPosition();
 VECTOR2I delta = pos - last;
 VECTOR2I deltaGrid = gridPt - grid.BestSnapAnchor( last, {}, { item } );
 
 if( abs( delta.x ) > grid.GetGrid().x / 2 )
 pos.x = last.x + deltaGrid.x;
 else
 pos.x = last.x;
 
 if( abs( delta.y ) > grid.GetGrid().y / 2 )
 pos.y = last.y + deltaGrid.y;
 else
 pos.y = last.y;
 }
 }
 
 m_editedPoint->SetPosition( pos );
 
 // The alternative constraint limits to 45 degrees
 if( useAltContraint )
 {
 m_altConstraint->Apply( grid );
 }
 else if( m_editedPoint->IsConstrained() )
 {
 m_editedPoint->ApplyConstraint( grid );
 }
 else if( m_editedPoint->GetGridConstraint() == SNAP_TO_GRID )
 {
 m_editedPoint->SetPosition( grid.BestSnapAnchor( m_editedPoint->GetPosition(),
 snapLayers, { item } ) );
 }
 
 updateItem();
 getViewControls()->ForceCursorPosition( true, m_editedPoint->GetPosition() );
 updatePoints();
 }
 else if( m_editedPoint && evt->Action() == TA_MOUSE_DOWN && evt->Buttons() == BUT_LEFT )
 {
 m_editedPoint->SetActive();
 
 for( size_t ii = 0; ii < m_editPoints->PointsSize(); ++ii )
 {
 EDIT_POINT& point = m_editPoints->Point( ii );
 
 if( &point != m_editedPoint )
 point.SetActive( false );
 }
 
 getView()->Update( m_editPoints.get() );
 }
 else if( inDrag && evt->IsMouseUp( BUT_LEFT ) )
 {
 if( m_editedPoint )
 {
 m_editedPoint->SetActive( false );
 getView()->Update( m_editPoints.get() );
 }
 
 getViewControls()->SetAutoPan( false );
 setAltConstraint( false );
 
 commit.Push( _( "Drag a corner" ) );
 inDrag = false;
 frame()->UndoRedoBlock( false );
 
 m_refill = true;
 }
 else if( evt->IsCancelInteractive() || evt->IsActivate() )
 {
 if( inDrag ) // Restore the last change
 {
 commit.Revert();
 inDrag = false;
 frame()->UndoRedoBlock( false );
 }
 
 // Only cancel point editor when activating a new tool
 // Otherwise, allow the points to persist when moving up the
 // tool stack
 if( evt->IsActivate() && !evt->IsMoveTool() )
 break;
 }
 else if( evt->Action() == TA_UNDO_REDO_POST )
 {
 break;
 }
 else
 {
 evt->SetPassEvent();
 }
 }
 
 if( m_editPoints )
 {
 getView()->Remove( m_editPoints.get() );
 m_editPoints.reset();
 }
 
 m_editedPoint = nullptr;
 
 return 0;
}
 
void PCB_POINT_EDITOR::editArcEndpointKeepTangent( PCB_SHAPE* aArc, const VECTOR2I& aCenter,
 const VECTOR2I& aStart, const VECTOR2I& aMid,
 const VECTOR2I& aEnd,
 const VECTOR2I& aCursor ) const
{
 VECTOR2I center = aCenter;
 bool movingStart;
 bool arcValid = true;
 
 VECTOR2I p1, p2, p3;
 // p1 does not move, p2 does.
 
 if( aStart != aArc->GetStart() )
 {
 p1 = aEnd;
 p2 = aStart;
 p3 = aMid;
 movingStart = true;
 }
 else if( aEnd != aArc->GetEnd() )
 {
 p1 = aStart;
 p2 = aEnd;
 p3 = aMid;
 movingStart = false;
 }
 else
 {
 return;
 }
 
 VECTOR2D v1, v2, v3, v4;
 
 // Move the coordinate system
 v1 = p1 - aCenter;
 v2 = p2 - aCenter;
 v3 = p3 - aCenter;
 
 VECTOR2D u1, u2, u3;
 
 // A point cannot be both the center and on the arc.
 if( ( v1.EuclideanNorm() == 0 ) || ( v2.EuclideanNorm() == 0 ) )
 return;
 
 u1 = v1 / v1.EuclideanNorm();
 u2 = v3 - ( u1.x * v3.x + u1.y * v3.y ) * u1;
 u2 = u2 / u2.EuclideanNorm();
 
 // [ u1, u3 ] is a base centered on the circle with:
 // u1 : unit vector toward the point that does not move
 // u2 : unit vector toward the mid point.
 
 // Get vectors v1, and v2 in that coordinate system.
 
 double det = u1.x * u2.y - u2.x * u1.y;
 
 // u1 and u2 are unit vectors, and perpendicular.
 // det should not be 0. In case it is, do not change the arc.
 if( det == 0 )
 return;
 
 double tmpx = v1.x * u2.y - v1.y * u2.x;
 double tmpy = -v1.x * u1.y + v1.y * u1.x;
 v1.x = tmpx;
 v1.y = tmpy;
 v1 = v1 / det;
 
 tmpx = v2.x * u2.y - v2.y * u2.x;
 tmpy = -v2.x * u1.y + v2.y * u1.x;
 v2.x = tmpx;
 v2.y = tmpy;
 v2 = v2 / det;
 
 double R = v1.EuclideanNorm();
 bool transformCircle = false;
 
 /* p2
 * X***
 * ** <---- This is the arc
 * y ^ **
 * | R *
 * | <-----------> *
 * x------x------>--------x p1
 * C' <----> C x
 * delta
 *
 * p1 does not move, and the tangent at p1 remains the same.
 * => The new center, C', will be on the C-p1 axis.
 * p2 moves
 *
 * The radius of the new circle is delta + R
 *
 * || C' p2 || = || C' P1 ||
 * is the same as :
 * ( delta + p2.x ) ^ 2 + p2.y ^ 2 = ( R + delta ) ^ 2
 *
 * delta = ( R^2 - p2.x ^ 2 - p2.y ^2 ) / ( 2 * p2.x - 2 * R )
 *
 * We can use this equation for any point p2 with p2.x < R
 */
 
 if( v2.x == R )
 {
 // Straight line, do nothing
 }
 else
 {
 if( v2.x > R )
 {
 // If we need to invert the curvature.
 // We modify the input so we can use the same equation
 transformCircle = true;
 v2.x = 2 * R - v2.x;
 }
 
 // We can keep the tangent constraint.
 double delta = ( R * R - v2.x * v2.x - v2.y * v2.y ) / ( 2 * v2.x - 2 * R );
 
 // This is just to limit the radius, so nothing overflows later when drawing.
 if( abs( v2.y / ( R - v2.x ) ) > ADVANCED_CFG::GetCfg().m_DrawArcCenterMaxAngle )
 arcValid = false;
 
 // Never recorded a problem, but still checking.
 if( !std::isfinite( delta ) )
 arcValid = false;
 
 // v4 is the new center
 v4 = ( !transformCircle ) ? VECTOR2D( -delta, 0 ) : VECTOR2D( 2 * R + delta, 0 );
 
 tmpx = v4.x * u1.x + v4.y * u2.x;
 tmpy = v4.x * u1.y + v4.y * u2.y;
 v4.x = tmpx;
 v4.y = tmpy;
 
 center = v4 + aCenter;
 
 if( arcValid )
 {
 aArc->SetCenter( center );
 
 if( movingStart )
 aArc->SetStart( aStart );
 else
 aArc->SetEnd( aEnd );
 }
 }
}
 
 
void PCB_POINT_EDITOR::editArcCenterKeepEndpoints( PCB_SHAPE* aArc, const VECTOR2I& aCenter,
 const VECTOR2I& aStart, const VECTOR2I& aMid,
 const VECTOR2I& aEnd ) const
{
 const int c_snapEpsilon_sq = 4;
 
 VECTOR2I m = ( aStart / 2 + aEnd / 2 );
 VECTOR2I perp = ( aEnd - aStart ).Perpendicular().Resize( INT_MAX / 2 );
 
 SEG legal( m - perp, m + perp );
 
 const SEG testSegments[] = { SEG( aCenter, aCenter + VECTOR2( 1, 0 ) ),
 SEG( aCenter, aCenter + VECTOR2( 0, 1 ) ) };
 
 std::vector<VECTOR2I> points = { legal.A, legal.B };
 
 for( const SEG& seg : testSegments )
 {
 OPT_VECTOR2I vec = legal.IntersectLines( seg );
 
 if( vec && legal.SquaredDistance( *vec ) <= c_snapEpsilon_sq )
 points.push_back( *vec );
 }
 
 OPT_VECTOR2I nearest;
 SEG::ecoord min_d_sq = VECTOR2I::ECOORD_MAX;
 
 // Snap by distance between cursor and intersections
 for( const VECTOR2I& pt : points )
 {
 SEG::ecoord d_sq = ( pt - aCenter ).SquaredEuclideanNorm();
 
 if( d_sq < min_d_sq - c_snapEpsilon_sq )
 {
 min_d_sq = d_sq;
 nearest = pt;
 }
 }
 
 if( nearest )
 aArc->SetCenter( *nearest );
}
 
 
void PCB_POINT_EDITOR::pinEditedCorner( VECTOR2I& aTopLeft, VECTOR2I& aTopRight,
 VECTOR2I& aBotLeft, VECTOR2I& aBotRight,
 const VECTOR2I& aHole, const VECTOR2I& aHoleSize ) const
{
 int minWidth = EDA_UNIT_UTILS::Mils2IU( pcbIUScale, 1 );
 int minHeight = EDA_UNIT_UTILS::Mils2IU( pcbIUScale, 1 );
 
 if( isModified( m_editPoints->Point( RECT_TOP_LEFT ) ) )
 {
 if( aHoleSize.x )
 {
 // pin edited point to the top/left of the hole
 aTopLeft.x = std::min( aTopLeft.x, aHole.x - aHoleSize.x / 2 - minWidth );
 aTopLeft.y = std::min( aTopLeft.y, aHole.y - aHoleSize.y / 2 - minHeight );
 }
 else
 {
 // pin edited point within opposite corner
 aTopLeft.x = std::min( aTopLeft.x, aBotRight.x - minWidth );
 aTopLeft.y = std::min( aTopLeft.y, aBotRight.y - minHeight );
 }
 
 // push edited point edges to adjacent corners
 aTopRight.y = aTopLeft.y;
 aBotLeft.x = aTopLeft.x;
 }
 else if( isModified( m_editPoints->Point( RECT_TOP_RIGHT ) ) )
 {
 if( aHoleSize.x )
 {
 // pin edited point to the top/right of the hole
 aTopRight.x = std::max( aTopRight.x, aHole.x + aHoleSize.x / 2 + minWidth );
 aTopRight.y = std::min( aTopRight.y, aHole.y - aHoleSize.y / 2 - minHeight );
 }
 else
 {
 // pin edited point within opposite corner
 aTopRight.x = std::max( aTopRight.x, aBotLeft.x + minWidth );
 aTopRight.y = std::min( aTopRight.y, aBotLeft.y - minHeight );
 }
 
 // push edited point edges to adjacent corners
 aTopLeft.y = aTopRight.y;
 aBotRight.x = aTopRight.x;
 }
 else if( isModified( m_editPoints->Point( RECT_BOT_LEFT ) ) )
 {
 if( aHoleSize.x )
 {
 // pin edited point to the bottom/left of the hole
 aBotLeft.x = std::min( aBotLeft.x, aHole.x - aHoleSize.x / 2 - minWidth );
 aBotLeft.y = std::max( aBotLeft.y, aHole.y + aHoleSize.y / 2 + minHeight );
 }
 else
 {
 // pin edited point within opposite corner
 aBotLeft.x = std::min( aBotLeft.x, aTopRight.x - minWidth );
 aBotLeft.y = std::max( aBotLeft.y, aTopRight.y + minHeight );
 }
 
 // push edited point edges to adjacent corners
 aBotRight.y = aBotLeft.y;
 aTopLeft.x = aBotLeft.x;
 }
 else if( isModified( m_editPoints->Point( RECT_BOT_RIGHT ) ) )
 {
 if( aHoleSize.x )
 {
 // pin edited point to the bottom/right of the hole
 aBotRight.x = std::max( aBotRight.x, aHole.x + aHoleSize.x / 2 + minWidth );
 aBotRight.y = std::max( aBotRight.y, aHole.y + aHoleSize.y / 2 + minHeight );
 }
 else
 {
 // pin edited point within opposite corner
 aBotRight.x = std::max( aBotRight.x, aTopLeft.x + minWidth );
 aBotRight.y = std::max( aBotRight.y, aTopLeft.y + minHeight );
 }
 
 // push edited point edges to adjacent corners
 aBotLeft.y = aBotRight.y;
 aTopRight.x = aBotRight.x;
 }
 else if( isModified( m_editPoints->Line( RECT_TOP ) ) )
 {
 aTopLeft.y = std::min( aTopLeft.y, aBotRight.y - minHeight );
 }
 else if( isModified( m_editPoints->Line( RECT_LEFT ) ) )
 {
 aTopLeft.x = std::min( aTopLeft.x, aBotRight.x - minWidth );
 }
 else if( isModified( m_editPoints->Line( RECT_BOT ) ) )
 {
 aBotRight.y = std::max( aBotRight.y, aTopLeft.y + minHeight );
 }
 else if( isModified( m_editPoints->Line( RECT_RIGHT ) ) )
 {
 aBotRight.x = std::max( aBotRight.x, aTopLeft.x + minWidth );
 }
}
 
 
void PCB_POINT_EDITOR::editArcEndpointKeepCenter( PCB_SHAPE* aArc, const VECTOR2I& aCenter,
 const VECTOR2I& aStart, const VECTOR2I& aMid,
 const VECTOR2I& aEnd,
 const VECTOR2I& aCursor ) const
{
 int minRadius = EDA_UNIT_UTILS::Mils2IU( pcbIUScale, 1 );
 bool movingStart;
 
 VECTOR2I p1, p2, prev_p1;
 
 // user is moving p1, we want to move p2 to the new radius.
 
 if( aStart != aArc->GetStart() )
 {
 prev_p1 = aArc->GetStart();
 p1 = aStart;
 p2 = aEnd;
 movingStart = true;
 }
 else
 {
 prev_p1 = aArc->GetEnd();
 p1 = aEnd;
 p2 = aStart;
 movingStart = false;
 }
 
 p1 = p1 - aCenter;
 p2 = p2 - aCenter;
 
 if( p1.x == 0 && p1.y == 0 )
 p1 = prev_p1 - aCenter;
 
 if( p2.x == 0 && p2.y == 0 )
 p2 = { 1, 0 };
 
 double radius = p1.EuclideanNorm();
 
 if( radius < minRadius )
 radius = minRadius;
 
 p1 = aCenter + p1.Resize( radius );
 p2 = aCenter + p2.Resize( radius );
 
 aArc->SetCenter( aCenter );
 
 if( movingStart )
 {
 aArc->SetStart( p1 );
 aArc->SetEnd( p2 );
 }
 else
 {
 aArc->SetStart( p2 );
 aArc->SetEnd( p1 );
 }
}
 
 
void PCB_POINT_EDITOR::editArcMidKeepCenter( PCB_SHAPE* aArc, const VECTOR2I& aCenter,
 const VECTOR2I& aStart, const VECTOR2I& aMid,
 const VECTOR2I& aEnd, const VECTOR2I& aCursor ) const
{
 int minRadius = EDA_UNIT_UTILS::Mils2IU( pcbIUScale, 1 );
 
 SEG chord( aStart, aEnd );
 
 // Now, update the edit point position
 // Express the point in a circle-centered coordinate system.
 VECTOR2I start = aStart - aCenter;
 VECTOR2I end = aEnd - aCenter;
 
 double radius = ( aCursor - aCenter ).EuclideanNorm();
 
 if( radius < minRadius )
 radius = minRadius;
 
 start = start.Resize( radius );
 end = end.Resize( radius );
 
 start = start + aCenter;
 end = end + aCenter;
 
 aArc->SetStart( start );
 aArc->SetEnd( end );
}
 
 
void PCB_POINT_EDITOR::editArcMidKeepEndpoints( PCB_SHAPE* aArc, const VECTOR2I& aStart,
 const VECTOR2I& aEnd,
 const VECTOR2I& aCursor ) const
{
 // Let 'm' be the middle point of the chord between the start and end points
 VECTOR2I m = ( aStart + aEnd ) / 2;
 
 // Legal midpoints lie on a vector starting just off the chord midpoint and extending out
 // past the existing midpoint. We do not allow arc inflection while point editing.
 const int JUST_OFF = ( aStart - aEnd ).EuclideanNorm() / 100;
 VECTOR2I v = (VECTOR2I) aArc->GetArcMid() - m;
 SEG legal( m + v.Resize( JUST_OFF ), m + v.Resize( INT_MAX / 2 ) );
 VECTOR2I mid = legal.NearestPoint( aCursor );
 
 aArc->SetArcGeometry( aStart, mid, aEnd );
}
 
 
void PCB_POINT_EDITOR::updateItem() const
{
 EDA_ITEM* item = m_editPoints->GetParent();
 
 if( !item )
 return;
 
 switch( item->Type() )
 {
 case PCB_BITMAP_T:
 {
 PCB_BITMAP* bitmap = (PCB_BITMAP*) item;
 VECTOR2I topLeft = m_editPoints->Point( RECT_TOP_LEFT ).GetPosition();
 VECTOR2I topRight = m_editPoints->Point( RECT_TOP_RIGHT ).GetPosition();
 VECTOR2I botLeft = m_editPoints->Point( RECT_BOT_LEFT ).GetPosition();
 VECTOR2I botRight = m_editPoints->Point( RECT_BOT_RIGHT ).GetPosition();
 
 pinEditedCorner( topLeft, topRight, botLeft, botRight );
 
 double oldWidth = bitmap->GetSize().x;
 double newWidth = std::max( topRight.x - topLeft.x, EDA_UNIT_UTILS::Mils2IU( pcbIUScale, 50 ) );
 double widthRatio = newWidth / oldWidth;
 
 double oldHeight = bitmap->GetSize().y;
 double newHeight =
 std::max( botLeft.y - topLeft.y, EDA_UNIT_UTILS::Mils2IU( pcbIUScale, 50 ) );
 double heightRatio = newHeight / oldHeight;
 
 bitmap->SetImageScale( bitmap->GetImageScale() * std::min( widthRatio, heightRatio ) );
 
 break;
 }
 
 case PCB_TEXTBOX_T:
 case PCB_FP_TEXTBOX_T:
 case PCB_SHAPE_T:
 case PCB_FP_SHAPE_T:
 {
 PCB_SHAPE* shape = static_cast<PCB_SHAPE*>( item );
 
 switch( shape->GetShape() )
 {
 case SHAPE_T::SEGMENT:
 if( isModified( m_editPoints->Point( SEG_START ) ) )
 shape->SetStart( m_editPoints->Point( SEG_START ).GetPosition() );
 else if( isModified( m_editPoints->Point( SEG_END ) ) )
 shape->SetEnd( m_editPoints->Point( SEG_END ).GetPosition() );
 
 break;
 
 case SHAPE_T::RECT:
 {
 VECTOR2I topLeft = m_editPoints->Point( RECT_TOP_LEFT ).GetPosition();
 VECTOR2I topRight = m_editPoints->Point( RECT_TOP_RIGHT ).GetPosition();
 VECTOR2I botLeft = m_editPoints->Point( RECT_BOT_LEFT ).GetPosition();
 VECTOR2I botRight = m_editPoints->Point( RECT_BOT_RIGHT ).GetPosition();
 
 pinEditedCorner( topLeft, topRight, botLeft, botRight );
 
 if( isModified( m_editPoints->Point( RECT_TOP_LEFT ) )
 || isModified( m_editPoints->Point( RECT_TOP_RIGHT ) )
 || isModified( m_editPoints->Point( RECT_BOT_RIGHT ) )
 || isModified( m_editPoints->Point( RECT_BOT_LEFT ) ) )
 {
 shape->SetLeft( topLeft.x );
 shape->SetTop( topLeft.y );
 shape->SetRight( botRight.x );
 shape->SetBottom( botRight.y );
 }
 else if( isModified( m_editPoints->Line( RECT_TOP ) ) )
 {
 shape->SetTop( topLeft.y );
 }
 else if( isModified( m_editPoints->Line( RECT_LEFT ) ) )
 {
 shape->SetLeft( topLeft.x );
 }
 else if( isModified( m_editPoints->Line( RECT_BOT ) ) )
 {
 shape->SetBottom( botRight.y );
 }
 else if( isModified( m_editPoints->Line( RECT_RIGHT ) ) )
 {
 shape->SetRight( botRight.x );
 }
 
 for( unsigned i = 0; i < m_editPoints->LinesSize(); ++i )
 {
 if( !isModified( m_editPoints->Line( i ) ) )
 {
 m_editPoints->Line( i ).SetConstraint(
 new EC_PERPLINE( m_editPoints->Line( i ) ) );
 }
 }
 
 break;
 }
 
 case SHAPE_T::ARC:
 {
 VECTOR2I center = m_editPoints->Point( ARC_CENTER ).GetPosition();
 VECTOR2I mid = m_editPoints->Point( ARC_MID ).GetPosition();
 VECTOR2I start = m_editPoints->Point( ARC_START ).GetPosition();
 VECTOR2I end = m_editPoints->Point( ARC_END ).GetPosition();
 
 if( isModified( m_editPoints->Point( ARC_CENTER ) ) )
 {
 if( m_arcEditMode == ARC_EDIT_MODE::KEEP_ENDPOINTS_OR_START_DIRECTION )
 {
 editArcCenterKeepEndpoints( shape, center, start, mid, end );
 }
 else
 {
 VECTOR2I moveVector = VECTOR2I( center.x, center.y ) - shape->GetCenter();
 shape->Move( moveVector );
 }
 }
 else if( isModified( m_editPoints->Point( ARC_MID ) ) )
 {
 const VECTOR2I& cursorPos = getViewControls()->GetCursorPosition( false );
 
 if( m_arcEditMode == ARC_EDIT_MODE::KEEP_ENDPOINTS_OR_START_DIRECTION )
 editArcMidKeepEndpoints( shape, start, end, cursorPos );
 else
 editArcMidKeepCenter( shape, center, start, mid, end, cursorPos );
 }
 else if( isModified( m_editPoints->Point( ARC_START ) )
 || isModified( m_editPoints->Point( ARC_END ) ) )
 {
 const VECTOR2I& cursorPos = getViewControls()->GetCursorPosition();
 
 if( m_arcEditMode == ARC_EDIT_MODE::KEEP_ENDPOINTS_OR_START_DIRECTION )
  editArcEndpointKeepTangent( shape, center, start, mid, end, cursorPos );
 else
 editArcEndpointKeepCenter( shape, center, start, mid, end, cursorPos );
 }
 
 break;
 }
 
 case SHAPE_T::CIRCLE:
 {
 const VECTOR2I& center = m_editPoints->Point( CIRC_CENTER ).GetPosition();
 const VECTOR2I& end = m_editPoints->Point( CIRC_END ).GetPosition();
 
 if( isModified( m_editPoints->Point( CIRC_CENTER ) ) )
 {
 VECTOR2I moveVector = VECTOR2I( center.x, center.y ) - shape->GetCenter();
 shape->Move( moveVector );
 }
 else
 {
 shape->SetEnd( VECTOR2I( end.x, end.y ) );
 }
 
 break;
 }
 
 case SHAPE_T::POLY:
 {
 SHAPE_POLY_SET& outline = shape->GetPolyShape();
 
 for( int i = 0; i < outline.TotalVertices(); ++i )
 outline.SetVertex( i, m_editPoints->Point( i ).GetPosition() );
 
 for( unsigned i = 0; i < m_editPoints->LinesSize(); ++i )
 {
 if( !isModified( m_editPoints->Line( i ) ) )
 m_editPoints->Line( i ).SetConstraint(
 new EC_PERPLINE( m_editPoints->Line( i ) ) );
 }
 
 validatePolygon( outline );
 break;
 }
 
 case SHAPE_T::BEZIER:
 if( isModified( m_editPoints->Point( BEZIER_CURVE_START ) ) )
 shape->SetStart( m_editPoints->Point( BEZIER_CURVE_START ).GetPosition() );
 else if( isModified( m_editPoints->Point( BEZIER_CURVE_CONTROL_POINT1 ) ) )
 shape->SetBezierC1( m_editPoints->Point( BEZIER_CURVE_CONTROL_POINT1 ).GetPosition() );
 else if( isModified( m_editPoints->Point( BEZIER_CURVE_CONTROL_POINT2 ) ) )
 shape->SetBezierC2( m_editPoints->Point( BEZIER_CURVE_CONTROL_POINT2 ).GetPosition() );
 else if( isModified( m_editPoints->Point( BEZIER_CURVE_END ) ) )
 shape->SetEnd( m_editPoints->Point( BEZIER_CURVE_END ).GetPosition() );
 
 shape->RebuildBezierToSegmentsPointsList( shape->GetWidth() );
 break;
 
 default: // suppress warnings
 break;
 }
 
 if( FP_SHAPE* fpShape = dynamic_cast<FP_SHAPE*>( item ) )
 {
 // Update relative coordinates for footprint shapes
 fpShape->SetLocalCoord();
 
 if( fpShape->IsAnnotationProxy() )
 {
 for( PAD* pad : fpShape->GetParentFootprint()->Pads() )
 {
 if( pad->GetFlags() & ENTERED )
 view()->Update( pad );
 }
 }
 }
 
 // Nuke outline font render caches
 if( PCB_TEXTBOX* textBox = dynamic_cast<PCB_TEXTBOX*>( item ) )
 textBox->ClearRenderCache();
 else if( FP_TEXTBOX* fpTextBox = dynamic_cast<FP_TEXTBOX*>( item ) )
 fpTextBox->ClearRenderCache();
 
 break;
 }
 
 case PCB_PAD_T:
 {
 PAD* pad = static_cast<PAD*>( item );
 
 switch( pad->GetShape() )
 {
 case PAD_SHAPE::CIRCLE:
 {
 VECTOR2I end = m_editPoints->Point( 0 ).GetPosition();
 int diameter = (int) EuclideanNorm( end - pad->GetPosition() ) * 2;
 
 pad->SetSize( VECTOR2I( diameter, diameter ) );
 break;
 }
 
 case PAD_SHAPE::OVAL:
 case PAD_SHAPE::TRAPEZOID:
 case PAD_SHAPE::RECT:
 case PAD_SHAPE::ROUNDRECT:
 case PAD_SHAPE::CHAMFERED_RECT:
 {
 VECTOR2I topLeft = m_editPoints->Point( RECT_TOP_LEFT ).GetPosition();
 VECTOR2I topRight = m_editPoints->Point( RECT_TOP_RIGHT ).GetPosition();
 VECTOR2I botLeft = m_editPoints->Point( RECT_BOT_LEFT ).GetPosition();
 VECTOR2I botRight = m_editPoints->Point( RECT_BOT_RIGHT ).GetPosition();
 VECTOR2I holeCenter = pad->GetPosition();
 VECTOR2I holeSize = pad->GetDrillSize();
 
 pinEditedCorner( topLeft, topRight, botLeft, botRight, holeCenter, holeSize );
 
 if( ( pad->GetOffset().x || pad->GetOffset().y )
 || ( pad->GetDrillSize().x && pad->GetDrillSize().y ) )
 {
 // Keep hole pinned at the current location; adjust the pad around the hole
 
 VECTOR2I center = pad->GetPosition();
 int dist[4];
 
 if( isModified( m_editPoints->Point( RECT_TOP_LEFT ) )
 || isModified( m_editPoints->Point( RECT_BOT_RIGHT ) ) )
 {
 dist[0] = center.x - topLeft.x;
 dist[1] = center.y - topLeft.y;
 dist[2] = botRight.x - center.x;
 dist[3] = botRight.y - center.y;
 }
 else
 {
 dist[0] = center.x - botLeft.x;
 dist[1] = center.y - topRight.y;
 dist[2] = topRight.x - center.x;
 dist[3] = botLeft.y - center.y;
 }
 
 VECTOR2I padSize( dist[0] + dist[2], dist[1] + dist[3] );
 VECTOR2I deltaOffset( padSize.x / 2 - dist[2], padSize.y / 2 - dist[3] );
 
 if( pad->GetOrientation() == ANGLE_90 || pad->GetOrientation() == ANGLE_270 )
 std::swap( padSize.x, padSize.y );
 
 RotatePoint( deltaOffset, -pad->GetOrientation() );
 
 pad->SetSize( padSize );
 pad->SetOffset( -deltaOffset );
 }
 else
 {
 // Keep pad position at the center of the pad shape
 
 int left, top, right, bottom;
 
 if( isModified( m_editPoints->Point( RECT_TOP_LEFT ) )
 || isModified( m_editPoints->Point( RECT_BOT_RIGHT ) ) )
 {
 left = topLeft.x;
 top = topLeft.y;
 right = botRight.x;
 bottom = botRight.y;
 }
 else
 {
 left = botLeft.x;
 top = topRight.y;
 right = topRight.x;
 bottom = botLeft.y;
 }
 
 VECTOR2I padSize( abs( right - left ), abs( bottom - top ) );
 
 if( pad->GetOrientation() == ANGLE_90 || pad->GetOrientation() == ANGLE_270 )
 std::swap( padSize.x, padSize.y );
 
 pad->SetSize( padSize );
 pad->SetPosition( VECTOR2I( ( left + right ) / 2, ( top + bottom ) / 2 ) );
 pad->SetLocalCoord();
 }
 break;
 }
 
 default: // suppress warnings
 break;
 }
 
 break;
 }
 
 case PCB_FP_ZONE_T:
 case PCB_ZONE_T:
 {
 ZONE* zone = static_cast<ZONE*>( item );
 zone->UnFill();
 SHAPE_POLY_SET& outline = *zone->Outline();
 
 for( int i = 0; i < outline.TotalVertices(); ++i )
 {
 if( outline.CVertex( i ) != m_editPoints->Point( i ).GetPosition() )
 zone->SetNeedRefill( true );
 
 outline.SetVertex( i, m_editPoints->Point( i ).GetPosition() );
 }
 
 for( unsigned i = 0; i < m_editPoints->LinesSize(); ++i )
 {
 if( !isModified( m_editPoints->Line( i ) ) )
 m_editPoints->Line( i ).SetConstraint( new EC_PERPLINE( m_editPoints->Line( i ) ) );
 }
 
 validatePolygon( outline );
 zone->HatchBorder();
 
 // TODO Refill zone when KiCad supports auto re-fill
 break;
 }
 
 case PCB_DIM_ALIGNED_T:
 case PCB_FP_DIM_ALIGNED_T:
 {
 PCB_DIM_ALIGNED* dimension = static_cast<PCB_DIM_ALIGNED*>( item );
 
 // Check which point is currently modified and updated dimension's points respectively
 if( isModified( m_editPoints->Point( DIM_CROSSBARSTART ) ) )
 {
 VECTOR2D featureLine( m_editedPoint->GetPosition() - dimension->GetStart() );
 VECTOR2D crossBar( dimension->GetEnd() - dimension->GetStart() );
 
 if( featureLine.Cross( crossBar ) > 0 )
 dimension->SetHeight( -featureLine.EuclideanNorm() );
 else
 dimension->SetHeight( featureLine.EuclideanNorm() );
 
 dimension->Update();
 }
 else if( isModified( m_editPoints->Point( DIM_CROSSBAREND ) ) )
 {
 VECTOR2D featureLine( m_editedPoint->GetPosition() - dimension->GetEnd() );
 VECTOR2D crossBar( dimension->GetEnd() - dimension->GetStart() );
 
 if( featureLine.Cross( crossBar ) > 0 )
 dimension->SetHeight( -featureLine.EuclideanNorm() );
 else
 dimension->SetHeight( featureLine.EuclideanNorm() );
 
 dimension->Update();
 }
 else if( isModified( m_editPoints->Point( DIM_START ) ) )
 {
 dimension->SetStart( m_editedPoint->GetPosition() );
 dimension->Update();
 
 m_editPoints->Point( DIM_CROSSBARSTART ).
 SetConstraint( new EC_LINE( m_editPoints->Point( DIM_CROSSBARSTART ),
 m_editPoints->Point( DIM_START ) ) );
 m_editPoints->Point( DIM_CROSSBAREND ).
 SetConstraint( new EC_LINE( m_editPoints->Point( DIM_CROSSBAREND ),
 m_editPoints->Point( DIM_END ) ) );
 }
 else if( isModified( m_editPoints->Point( DIM_END ) ) )
 {
 dimension->SetEnd( m_editedPoint->GetPosition() );
 dimension->Update();
 
 m_editPoints->Point( DIM_CROSSBARSTART ).
 SetConstraint( new EC_LINE( m_editPoints->Point( DIM_CROSSBARSTART ),
 m_editPoints->Point( DIM_START ) ) );
 m_editPoints->Point( DIM_CROSSBAREND ).
 SetConstraint( new EC_LINE( m_editPoints->Point( DIM_CROSSBAREND ),
 m_editPoints->Point( DIM_END ) ) );
 }
 else if( isModified( m_editPoints->Point(DIM_TEXT ) ) )
 {
 // Force manual mode if we weren't already in it
 dimension->SetTextPositionMode( DIM_TEXT_POSITION::MANUAL );
 dimension->SetTextPos( m_editedPoint->GetPosition() );
 dimension->Update();
 }
 
 break;
 }
 
 case PCB_DIM_ORTHOGONAL_T:
 case PCB_FP_DIM_ORTHOGONAL_T:
 {
 PCB_DIM_ORTHOGONAL* dimension = static_cast<PCB_DIM_ORTHOGONAL*>( item );
 
 if( isModified( m_editPoints->Point( DIM_CROSSBARSTART ) ) ||
 isModified( m_editPoints->Point( DIM_CROSSBAREND ) ) )
 {
 BOX2I bounds( dimension->GetStart(), dimension->GetEnd() - dimension->GetStart() );
 
 const VECTOR2I& cursorPos = m_editedPoint->GetPosition();
 
 // Find vector from nearest dimension point to edit position
 VECTOR2I directionA( cursorPos - dimension->GetStart() );
 VECTOR2I directionB( cursorPos - dimension->GetEnd() );
 VECTOR2I direction = ( directionA < directionB ) ? directionA : directionB;
 
 bool vert;
 VECTOR2D featureLine( cursorPos - dimension->GetStart() );
 
 // Only change the orientation when we move outside the bounds
 if( !bounds.Contains( cursorPos ) )
 {
 // If the dimension is horizontal or vertical, set correct orientation
 // otherwise, test if we're left/right of the bounding box or above/below it
 if( bounds.GetWidth() == 0 )
 vert = true;
 else if( bounds.GetHeight() == 0 )
 vert = false;
 else if( cursorPos.x > bounds.GetLeft() && cursorPos.x < bounds.GetRight() )
 vert = false;
 else if( cursorPos.y > bounds.GetTop() && cursorPos.y < bounds.GetBottom() )
 vert = true;
 else
 vert = std::abs( direction.y ) < std::abs( direction.x );
 
 dimension->SetOrientation( vert ? PCB_DIM_ORTHOGONAL::DIR::VERTICAL
 : PCB_DIM_ORTHOGONAL::DIR::HORIZONTAL );
 }
 else
 {
 vert = dimension->GetOrientation() == PCB_DIM_ORTHOGONAL::DIR::VERTICAL;
 }
 
 dimension->SetHeight( vert ? featureLine.x : featureLine.y );
 }
 else if( isModified( m_editPoints->Point( DIM_START ) ) )
 {
 dimension->SetStart( m_editedPoint->GetPosition() );
 }
 else if( isModified( m_editPoints->Point( DIM_END ) ) )
 {
 dimension->SetEnd( m_editedPoint->GetPosition() );
 }
 else if( isModified( m_editPoints->Point(DIM_TEXT ) ) )
 {
 // Force manual mode if we weren't already in it
 dimension->SetTextPositionMode( DIM_TEXT_POSITION::MANUAL );
 dimension->SetTextPos( VECTOR2I( m_editedPoint->GetPosition() ) );
 }
 
 dimension->Update();
 
 break;
 }
 
 case PCB_DIM_CENTER_T:
 case PCB_FP_DIM_CENTER_T:
 {
 PCB_DIM_CENTER* dimension = static_cast<PCB_DIM_CENTER*>( item );
 
 if( isModified( m_editPoints->Point( DIM_START ) ) )
 dimension->SetStart( m_editedPoint->GetPosition() );
 else if( isModified( m_editPoints->Point( DIM_END ) ) )
 dimension->SetEnd( m_editedPoint->GetPosition() );
 
 dimension->Update();
 
 break;
 }
 
 case PCB_DIM_RADIAL_T:
 case PCB_FP_DIM_RADIAL_T:
 {
 PCB_DIM_RADIAL* dimension = static_cast<PCB_DIM_RADIAL*>( item );
 
 if( isModified( m_editPoints->Point( DIM_START ) ) )
 {
 dimension->SetStart( m_editedPoint->GetPosition() );
 dimension->Update();
 
 m_editPoints->Point( DIM_KNEE ).SetConstraint( new EC_LINE( m_editPoints->Point( DIM_START ),
 m_editPoints->Point( DIM_END ) ) );
 }
 else if( isModified( m_editPoints->Point( DIM_END ) ) )
 {
 VECTOR2I oldKnee = dimension->GetKnee();
 
 dimension->SetEnd( m_editedPoint->GetPosition() );
 dimension->Update();
 
 VECTOR2I kneeDelta = dimension->GetKnee() - oldKnee;
 dimension->SetTextPos( dimension->GetTextPos() + kneeDelta );
 dimension->Update();
 
 m_editPoints->Point( DIM_KNEE ).SetConstraint( new EC_LINE( m_editPoints->Point( DIM_START ),
 m_editPoints->Point( DIM_END ) ) );
 }
 else if( isModified( m_editPoints->Point( DIM_KNEE ) ) )
 {
 VECTOR2I oldKnee = dimension->GetKnee();
 VECTOR2I arrowVec = m_editPoints->Point( DIM_KNEE ).GetPosition()
 - m_editPoints->Point( DIM_END ).GetPosition();
 
 dimension->SetLeaderLength( arrowVec.EuclideanNorm() );
 dimension->Update();
 
 VECTOR2I kneeDelta = dimension->GetKnee() - oldKnee;
 dimension->SetTextPos( dimension->GetTextPos() + kneeDelta );
 dimension->Update();
 }
 else if( isModified( m_editPoints->Point( DIM_TEXT ) ) )
 {
 dimension->SetTextPos( m_editedPoint->GetPosition() );
 dimension->Update();
 }
 
 break;
 }
 
 case PCB_DIM_LEADER_T:
 case PCB_FP_DIM_LEADER_T:
 {
 PCB_DIM_LEADER* dimension = static_cast<PCB_DIM_LEADER*>( item );
 
 if( isModified( m_editPoints->Point( DIM_START ) ) )
 {
 dimension->SetStart( (VECTOR2I) m_editedPoint->GetPosition() );
 }
 else if( isModified( m_editPoints->Point( DIM_END ) ) )
 {
 VECTOR2I newPoint( m_editedPoint->GetPosition() );
 VECTOR2I delta = newPoint - dimension->GetEnd();
 
 dimension->SetEnd( newPoint );
 dimension->SetTextPos( dimension->GetTextPos() + delta );
 }
 else if( isModified( m_editPoints->Point( DIM_TEXT ) ) )
 {
 dimension->SetTextPos( (VECTOR2I) m_editedPoint->GetPosition() );
 }
 
 dimension->Update();
 
 break;
 }
 
 default:
 break;
 }
 
 getView()->Update( item );
 
 frame()->SetMsgPanel( item );
}
 
 
bool PCB_POINT_EDITOR::validatePolygon( SHAPE_POLY_SET& aPoly ) const
{
 return true;
}
 
 
void PCB_POINT_EDITOR::updatePoints()
{
 if( !m_editPoints )
 return;
 
 EDA_ITEM* item = m_editPoints->GetParent();
 
 if( !item )
 return;
 
 switch( item->Type() )
 {
 case PCB_BITMAP_T:
 {
 PCB_BITMAP* bitmap = (PCB_BITMAP*) item;
 VECTOR2I topLeft = bitmap->GetPosition() - bitmap->GetSize() / 2;
 VECTOR2I botRight = bitmap->GetPosition() + bitmap->GetSize() / 2;
 
 m_editPoints->Point( RECT_TOP_LEFT ).SetPosition( topLeft );
 m_editPoints->Point( RECT_TOP_RIGHT ).SetPosition( botRight.x, topLeft.y );
 m_editPoints->Point( RECT_BOT_LEFT ).SetPosition( topLeft.x, botRight.y );
 m_editPoints->Point( RECT_BOT_RIGHT ).SetPosition( botRight );
 
 break;
 }
 
 case PCB_TEXTBOX_T:
 case PCB_FP_TEXTBOX_T:
 {
 const PCB_SHAPE* shape = static_cast<const PCB_SHAPE*>( item );
 int target = shape->GetShape() == SHAPE_T::RECT ? 4 : 0;
 
 // Careful; textbox shape is mutable between cardinal and non-cardinal rotations...
 if( int( m_editPoints->PointsSize() ) != target )
 {
 getView()->Remove( m_editPoints.get() );
 m_editedPoint = nullptr;
 
 m_editPoints = makePoints( item );
 
 if( m_editPoints )
 getView()->Add( m_editPoints.get() );
 
 break;
 }
 
 if( shape->GetShape() == SHAPE_T::RECT )
 {
 m_editPoints->Point( RECT_TOP_LEFT ).SetPosition( shape->GetTopLeft() );
 m_editPoints->Point( RECT_TOP_RIGHT ).SetPosition( shape->GetBotRight().x,
 shape->GetTopLeft().y );
 m_editPoints->Point( RECT_BOT_RIGHT ).SetPosition( shape->GetBotRight() );
 m_editPoints->Point( RECT_BOT_LEFT ).SetPosition( shape->GetTopLeft().x,
 shape->GetBotRight().y );
 }
 else if( shape->GetShape() == SHAPE_T::POLY )
 {
 // Not currently editable while rotated.
 }
 
 break;
 }
 
 case PCB_SHAPE_T:
 case PCB_FP_SHAPE_T:
 {
 const PCB_SHAPE* shape = static_cast<const PCB_SHAPE*>( item );
 
 switch( shape->GetShape() )
 {
 case SHAPE_T::SEGMENT:
 m_editPoints->Point( SEG_START ).SetPosition( shape->GetStart() );
 m_editPoints->Point( SEG_END ).SetPosition( shape->GetEnd() );
 break;
 
 case SHAPE_T::RECT:
 m_editPoints->Point( RECT_TOP_LEFT ).SetPosition( shape->GetTopLeft() );
 m_editPoints->Point( RECT_TOP_RIGHT ).SetPosition( shape->GetBotRight().x,
 shape->GetTopLeft().y );
 m_editPoints->Point( RECT_BOT_RIGHT ).SetPosition( shape->GetBotRight() );
 m_editPoints->Point( RECT_BOT_LEFT ).SetPosition( shape->GetTopLeft().x,
 shape->GetBotRight().y );
 break;
 
 case SHAPE_T::ARC:
 m_editPoints->Point( ARC_CENTER ).SetPosition( shape->GetCenter() );
 m_editPoints->Point( ARC_START ).SetPosition( shape->GetStart() );
 m_editPoints->Point( ARC_MID ).SetPosition( shape->GetArcMid() );
 m_editPoints->Point( ARC_END ).SetPosition( shape->GetEnd() );
 break;
 
 case SHAPE_T::CIRCLE:
 m_editPoints->Point( CIRC_CENTER ).SetPosition( shape->GetCenter() );
 m_editPoints->Point( CIRC_END ).SetPosition( shape->GetEnd() );
 break;
 
 case SHAPE_T::POLY:
 {
 std::vector<VECTOR2I> points;
 shape->DupPolyPointsList( points );
 
 if( m_editPoints->PointsSize() != (unsigned) points.size() )
 {
 getView()->Remove( m_editPoints.get() );
 m_editedPoint = nullptr;
 
 m_editPoints = makePoints( item );
 
 if( m_editPoints )
 getView()->Add( m_editPoints.get() );
 }
 else
 {
 for( unsigned i = 0; i < points.size(); i++ )
 m_editPoints->Point( i ).SetPosition( points[i] );
 }
 
 break;
 }
 
 case SHAPE_T::BEZIER:
 m_editPoints->Point( BEZIER_CURVE_START ).SetPosition( shape->GetStart() );
 m_editPoints->Point( BEZIER_CURVE_CONTROL_POINT1 ).SetPosition( shape->GetBezierC1() );
 m_editPoints->Point( BEZIER_CURVE_CONTROL_POINT2 ).SetPosition( shape->GetBezierC2() );
 m_editPoints->Point( BEZIER_CURVE_END ).SetPosition( shape->GetEnd() );
 break;
 
 default: // suppress warnings
 break;
 }
 
 break;
 }
 
 case PCB_PAD_T:
 {
 const PAD* pad = static_cast<const PAD*>( item );
 bool locked = pad->GetParent() && pad->IsLocked();
  VECTOR2I shapePos = pad->ShapePos();
 VECTOR2I halfSize( pad->GetSize().x / 2, pad->GetSize().y / 2 );
 
 switch( pad->GetShape() )
 {
 case PAD_SHAPE::CIRCLE:
 {
 int target = locked ? 0 : 1;
 
 // Careful; pad shape is mutable...
 if( int( m_editPoints->PointsSize() ) != target )
 {
 getView()->Remove( m_editPoints.get() );
 m_editedPoint = nullptr;
 
 m_editPoints = makePoints( item );
 
 if( m_editPoints )
 getView()->Add( m_editPoints.get() );
 }
 else if( target == 1 )
 {
 shapePos.x += halfSize.x;
 m_editPoints->Point( 0 ).SetPosition( shapePos );
 }
 }
 break;
 
 case PAD_SHAPE::OVAL:
 case PAD_SHAPE::TRAPEZOID:
 case PAD_SHAPE::RECT:
 case PAD_SHAPE::ROUNDRECT:
 case PAD_SHAPE::CHAMFERED_RECT:
 {
 // Careful; pad shape and orientation are mutable...
 int target = locked || !pad->GetOrientation().IsCardinal() ? 0 : 4;
 
 if( int( m_editPoints->PointsSize() ) != target )
 {
 getView()->Remove( m_editPoints.get() );
 m_editedPoint = nullptr;
 
 m_editPoints = makePoints( item );
 
 if( m_editPoints )
 getView()->Add( m_editPoints.get() );
 }
 else if( target == 4 )
 {
 if( pad->GetOrientation() == ANGLE_90 || pad->GetOrientation() == ANGLE_270 )
 std::swap( halfSize.x, halfSize.y );
 
 m_editPoints->Point( RECT_TOP_LEFT ).SetPosition( shapePos - halfSize );
 m_editPoints->Point( RECT_TOP_RIGHT )
 .SetPosition(
 VECTOR2I( shapePos.x + halfSize.x, shapePos.y - halfSize.y ) );
 m_editPoints->Point( RECT_BOT_RIGHT ).SetPosition( shapePos + halfSize );
 m_editPoints->Point( RECT_BOT_LEFT )
 .SetPosition(
 VECTOR2I( shapePos.x - halfSize.x, shapePos.y + halfSize.y ) );
 }
 
 break;
 }
 
 default: // suppress warnings
 break;
 }
 }
 break;
 
 case PCB_FP_ZONE_T:
 case PCB_ZONE_T:
 {
 ZONE* zone = static_cast<ZONE*>( item );
 const SHAPE_POLY_SET* outline = zone->Outline();
 
 if( m_editPoints->PointsSize() != (unsigned) outline->TotalVertices() )
 {
 getView()->Remove( m_editPoints.get() );
 m_editedPoint = nullptr;
 
 m_editPoints = makePoints( item );
 
 if( m_editPoints )
 getView()->Add( m_editPoints.get() );
 }
 else
 {
 for( int i = 0; i < outline->TotalVertices(); ++i )
 m_editPoints->Point( i ).SetPosition( outline->CVertex( i ) );
 }
 
 break;
 }
 
 case PCB_DIM_ALIGNED_T:
 case PCB_DIM_ORTHOGONAL_T:
 case PCB_FP_DIM_ALIGNED_T:
 case PCB_FP_DIM_ORTHOGONAL_T:
 {
 const PCB_DIM_ALIGNED* dimension = static_cast<const PCB_DIM_ALIGNED*>( item );
 
 m_editPoints->Point( DIM_START ).SetPosition( dimension->GetStart() );
 m_editPoints->Point( DIM_END ).SetPosition( dimension->GetEnd() );
 m_editPoints->Point( DIM_TEXT ).SetPosition( dimension->GetTextPos() );
 m_editPoints->Point( DIM_CROSSBARSTART ).SetPosition( dimension->GetCrossbarStart() );
 m_editPoints->Point( DIM_CROSSBAREND ).SetPosition( dimension->GetCrossbarEnd() );
 break;
 }
 
 case PCB_DIM_CENTER_T:
 case PCB_FP_DIM_CENTER_T:
 {
 const PCB_DIM_CENTER* dimension = static_cast<const PCB_DIM_CENTER*>( item );
 
 m_editPoints->Point( DIM_START ).SetPosition( dimension->GetStart() );
 m_editPoints->Point( DIM_END ).SetPosition( dimension->GetEnd() );
 break;
 }
 
 case PCB_DIM_RADIAL_T:
 case PCB_FP_DIM_RADIAL_T:
 {
 const PCB_DIM_RADIAL* dimension = static_cast<const PCB_DIM_RADIAL*>( item );
 
 m_editPoints->Point( DIM_START ).SetPosition( dimension->GetStart() );
 m_editPoints->Point( DIM_END ).SetPosition( dimension->GetEnd() );
 m_editPoints->Point( DIM_TEXT ).SetPosition( dimension->GetTextPos() );
 m_editPoints->Point( DIM_KNEE ).SetPosition( dimension->GetKnee() );
 break;
 }
 
 case PCB_DIM_LEADER_T:
 case PCB_FP_DIM_LEADER_T:
 {
 const PCB_DIM_LEADER* dimension = static_cast<const PCB_DIM_LEADER*>( item );
 
 m_editPoints->Point( DIM_START ).SetPosition( dimension->GetStart() );
 m_editPoints->Point( DIM_END ).SetPosition( dimension->GetEnd() );
 m_editPoints->Point( DIM_TEXT ).SetPosition( dimension->GetTextPos() );
 break;
 }
 
 default:
 break;
 }
 
 getView()->Update( m_editPoints.get() );
}
 
 
void PCB_POINT_EDITOR::setEditedPoint( EDIT_POINT* aPoint )
{
 KIGFX::VIEW_CONTROLS* controls = getViewControls();
 
 if( aPoint )
 {
 frame()->GetCanvas()->SetCurrentCursor( KICURSOR::ARROW );
 controls->ForceCursorPosition( true, aPoint->GetPosition() );
 controls->ShowCursor( true );
 }
 else
 {
 if( frame()->ToolStackIsEmpty() )
 controls->ShowCursor( false );
 
 controls->ForceCursorPosition( false );
 }
 
 m_editedPoint = aPoint;
}
 
 
void PCB_POINT_EDITOR::setAltConstraint( bool aEnabled )
{
 if( aEnabled )
 {
 EDA_ITEM* parent = m_editPoints->GetParent();
 EDIT_LINE* line = dynamic_cast<EDIT_LINE*>( m_editedPoint );
 bool isPoly;
 
 switch( parent->Type() )
 {
 case PCB_ZONE_T:
 case PCB_FP_ZONE_T:
 isPoly = true;
 break;
 
 case PCB_SHAPE_T:
 case PCB_FP_SHAPE_T:
 isPoly = static_cast<PCB_SHAPE*>( parent )->GetShape() == SHAPE_T::POLY;
 break;
 
 default:
 isPoly = false;
 break;
 }
 
 if( line && isPoly )
 {
 EC_CONVERGING* altConstraint = new EC_CONVERGING( *line, *m_editPoints );
 m_altConstraint.reset( (EDIT_CONSTRAINT<EDIT_POINT>*) altConstraint );
 }
 else
 {
 // Find a proper constraining point for 45 degrees mode
 m_altConstrainer = get45DegConstrainer();
 m_altConstraint.reset( new EC_45DEGREE( *m_editedPoint, m_altConstrainer ) );
 }
 }
 else
 {
 m_altConstraint.reset();
 }
}
 
 
EDIT_POINT PCB_POINT_EDITOR::get45DegConstrainer() const
{
 EDA_ITEM* item = m_editPoints->GetParent();
 
 switch( item->Type() )
 {
 case PCB_SHAPE_T:
 case PCB_FP_SHAPE_T:
 switch( static_cast<const PCB_SHAPE*>( item )->GetShape() )
 {
 case SHAPE_T::SEGMENT:
 return *( m_editPoints->Next( *m_editedPoint ) ); // select the other end of line
 
 case SHAPE_T::ARC:
 case SHAPE_T::CIRCLE:
 return m_editPoints->Point( CIRC_CENTER );
 
 default: // suppress warnings
 break;
 }
 
 break;
 
 case PCB_DIM_ALIGNED_T:
 case PCB_FP_DIM_ALIGNED_T:
 {
 // Constraint for crossbar
 if( isModified( m_editPoints->Point( DIM_START ) ) )
 return m_editPoints->Point( DIM_END );
 
 else if( isModified( m_editPoints->Point( DIM_END ) ) )
 return m_editPoints->Point( DIM_START );
 
 else
 return EDIT_POINT( m_editedPoint->GetPosition() ); // no constraint
 
 break;
 }
 
 case PCB_DIM_CENTER_T:
 case PCB_FP_DIM_CENTER_T:
 {
 if( isModified( m_editPoints->Point( DIM_END ) ) )
 return m_editPoints->Point( DIM_START );
 
 break;
 }
 
 case PCB_DIM_RADIAL_T:
 case PCB_FP_DIM_RADIAL_T:
 {
 if( isModified( m_editPoints->Point( DIM_TEXT ) ) )
 return m_editPoints->Point( DIM_KNEE );
 
 break;
 }
 
 default:
 break;
 }
 
 // In any other case we may align item to its original position
 return m_original;
}
 
 
bool PCB_POINT_EDITOR::canAddCorner( const EDA_ITEM& aItem )
{
 const auto type = aItem.Type();
 
 // Works only for zones and line segments
 if( type == PCB_ZONE_T || type == PCB_FP_ZONE_T )
 return true;
 
 if( type == PCB_SHAPE_T || type == PCB_FP_SHAPE_T )
 {
 const PCB_SHAPE& shape = static_cast<const PCB_SHAPE&>( aItem );
 return shape.GetShape() == SHAPE_T::SEGMENT || shape.GetShape() == SHAPE_T::POLY;
 }
 
 return false;
}
 
 
bool PCB_POINT_EDITOR::addCornerCondition( const SELECTION& aSelection )
{
 if( aSelection.Size() != 1 )
 return false;
 
 const EDA_ITEM* item = aSelection.Front();
 
 return ( item != nullptr ) && canAddCorner( *item );
}
 
 
// Finds a corresponding vertex in a polygon set
static std::pair<bool, SHAPE_POLY_SET::VERTEX_INDEX>
findVertex( SHAPE_POLY_SET& aPolySet, const EDIT_POINT& aPoint )
{
 for( auto it = aPolySet.IterateWithHoles(); it; ++it )
 {
 auto vertexIdx = it.GetIndex();
 
 if( aPolySet.CVertex( vertexIdx ) == aPoint.GetPosition() )
 return std::make_pair( true, vertexIdx );
 }
 
 return std::make_pair( false, SHAPE_POLY_SET::VERTEX_INDEX() );
}
 
 
bool PCB_POINT_EDITOR::removeCornerCondition( const SELECTION& )
{
 if( !m_editPoints || !m_editedPoint )
 return false;
 
 EDA_ITEM* item = m_editPoints->GetParent();
 SHAPE_POLY_SET* polyset = nullptr;
 
 if( !item )
 return false;
 
 switch( item->Type() )
 {
 case PCB_ZONE_T:
 case PCB_FP_ZONE_T:
 polyset = static_cast<ZONE*>( item )->Outline();
 break;
 
 case PCB_SHAPE_T:
 case PCB_FP_SHAPE_T:
 if( static_cast<PCB_SHAPE*>( item )->GetShape() == SHAPE_T::POLY )
 polyset = &static_cast<PCB_SHAPE*>( item )->GetPolyShape();
 else
 return false;
 
 break;
 
 default:
 return false;
 }
 
 std::pair<bool, SHAPE_POLY_SET::VERTEX_INDEX> vertex = findVertex( *polyset, *m_editedPoint );
 
 if( !vertex.first )
 return false;
 
 const SHAPE_POLY_SET::VERTEX_INDEX& vertexIdx = vertex.second;
 
 // Check if there are enough vertices so one can be removed without
 // degenerating the polygon.
 // The first condition allows one to remove all corners from holes (when
 // there are only 2 vertices left, a hole is removed).
 if( vertexIdx.m_contour == 0 &&
 polyset->Polygon( vertexIdx.m_polygon )[vertexIdx.m_contour].PointCount() <= 3 )
 {
 return false;
 }
 
 // Remove corner does not work with lines
 if( dynamic_cast<EDIT_LINE*>( m_editedPoint ) )
 return false;
 
 return m_editedPoint != nullptr;
}
 
 
int PCB_POINT_EDITOR::addCorner( const TOOL_EVENT& aEvent )
{
 if( !m_editPoints )
 return 0;
 
 EDA_ITEM* item = m_editPoints->GetParent();
 PCB_BASE_EDIT_FRAME* frame = getEditFrame<PCB_BASE_EDIT_FRAME>();
 const VECTOR2I& cursorPos = getViewControls()->GetCursorPosition();
 
 // called without an active edited polygon
 if( !item || !canAddCorner( *item ) )
 return 0;
 
 PCB_SHAPE* graphicItem = dynamic_cast<PCB_SHAPE*>( item );
 BOARD_COMMIT commit( frame );
 
 if( item->Type() == PCB_ZONE_T || item->Type() == PCB_FP_ZONE_T
 || ( graphicItem && graphicItem->GetShape() == SHAPE_T::POLY ) )
 {
 unsigned int nearestIdx = 0;
 unsigned int nextNearestIdx = 0;
 unsigned int nearestDist = INT_MAX;
 unsigned int firstPointInContour = 0;
 SHAPE_POLY_SET* zoneOutline;
 
 if( item->Type() == PCB_ZONE_T || item->Type() == PCB_FP_ZONE_T )
 {
 ZONE* zone = static_cast<ZONE*>( item );
 zoneOutline = zone->Outline();
 zone->SetNeedRefill( true );
 }
 else
 {
 zoneOutline = &( graphicItem->GetPolyShape() );
 }
 
 commit.Modify( item );
 
 // Search the best outline segment to add a new corner
 // and therefore break this segment into two segments
 
 // Object to iterate through the corners of the outlines (main contour and its holes)
 SHAPE_POLY_SET::ITERATOR iterator = zoneOutline->Iterate( 0, zoneOutline->OutlineCount()-1,
 /* IterateHoles */ true );
 int curr_idx = 0;
 
 // Iterate through all the corners of the outlines and search the best segment
 for( ; iterator; iterator++, curr_idx++ )
 {
 int jj = curr_idx+1;
 
 if( iterator.IsEndContour() )
 { // We reach the last point of the current contour (main or hole)
 jj = firstPointInContour;
 firstPointInContour = curr_idx+1; // Prepare next contour analysis
 }
 
 SEG curr_segment( zoneOutline->CVertex( curr_idx ), zoneOutline->CVertex( jj ) );
 
 unsigned int distance = curr_segment.Distance( cursorPos );
 
 if( distance < nearestDist )
 {
 nearestDist = distance;
 nearestIdx = curr_idx;
 nextNearestIdx = jj;
 }
 }
 
 // Find the point on the closest segment
 const VECTOR2I& sideOrigin = zoneOutline->CVertex( nearestIdx );
 const VECTOR2I& sideEnd = zoneOutline->CVertex( nextNearestIdx );
 SEG nearestSide( sideOrigin, sideEnd );
 VECTOR2I nearestPoint = nearestSide.NearestPoint( cursorPos );
 
 // Do not add points that have the same coordinates as ones that already belong to polygon
 // instead, add a point in the middle of the side
 if( nearestPoint == sideOrigin || nearestPoint == sideEnd )
 nearestPoint = ( sideOrigin + sideEnd ) / 2;
 
 zoneOutline->InsertVertex( nextNearestIdx, nearestPoint );
 
 // We re-hatch the filled zones but not polygons
 if( item->Type() == PCB_ZONE_T || item->Type() == PCB_FP_ZONE_T )
 static_cast<ZONE*>( item )->HatchBorder();
 
 
 commit.Push( _( "Add a zone corner" ) );
 }
 else if( graphicItem && graphicItem->GetShape() == SHAPE_T::SEGMENT )
 {
 commit.Modify( graphicItem );
 
 SEG seg( graphicItem->GetStart(), graphicItem->GetEnd() );
 VECTOR2I nearestPoint = seg.NearestPoint( cursorPos );
 
 // Move the end of the line to the break point..
 graphicItem->SetEnd( VECTOR2I( nearestPoint.x, nearestPoint.y ) );
 
 if( graphicItem->Type() == PCB_FP_SHAPE_T )
 static_cast<FP_SHAPE*>( graphicItem )->SetLocalCoord();
 
 // and add another one starting from the break point
 PCB_SHAPE* newSegment;
 
 if( item->Type() == PCB_FP_SHAPE_T )
 {
 FP_SHAPE* edge = static_cast<FP_SHAPE*>( graphicItem );
 assert( edge->GetParent()->Type() == PCB_FOOTPRINT_T );
 newSegment = new FP_SHAPE( *edge );
 }
 else
 {
 newSegment = new PCB_SHAPE( *graphicItem );
 }
 
 newSegment->ClearSelected();
 newSegment->SetStart( VECTOR2I( nearestPoint.x, nearestPoint.y ) );
 newSegment->SetEnd( VECTOR2I( seg.B.x, seg.B.y ) );
 
 if( newSegment->Type() == PCB_FP_SHAPE_T )
 static_cast<FP_SHAPE*>( newSegment )->SetLocalCoord();
 
 commit.Add( newSegment );
 commit.Push( _( "Split segment" ) );
 }
 
 updatePoints();
 return 0;
}
 
 
int PCB_POINT_EDITOR::removeCorner( const TOOL_EVENT& aEvent )
{
 if( !m_editPoints || !m_editedPoint )
 return 0;
 
 EDA_ITEM* item = m_editPoints->GetParent();
 
 if( !item )
 return 0;
 
 SHAPE_POLY_SET* polygon = nullptr;
 
 if( item->Type() == PCB_ZONE_T || item->Type() == PCB_FP_ZONE_T )
 {
 ZONE* zone = static_cast<ZONE*>( item );
 polygon = zone->Outline();
 zone->SetNeedRefill( true );
 }
 else if( item->Type() == PCB_FP_SHAPE_T || item->Type() == PCB_SHAPE_T )
 {
 PCB_SHAPE* shape = static_cast<PCB_SHAPE*>( item );
 
 if( shape->GetShape() == SHAPE_T::POLY )
 polygon = &shape->GetPolyShape();
 }
 
 if( !polygon )
 return 0;
 
 PCB_BASE_FRAME* frame = getEditFrame<PCB_BASE_FRAME>();
 BOARD_COMMIT commit( frame );
 auto vertex = findVertex( *polygon, *m_editedPoint );
 
 if( vertex.first )
 {
 const auto& vertexIdx = vertex.second;
 auto& outline = polygon->Polygon( vertexIdx.m_polygon )[vertexIdx.m_contour];
 
 if( outline.PointCount() > 3 )
 {
 // the usual case: remove just the corner when there are >3 vertices
 commit.Modify( item );
 polygon->RemoveVertex( vertexIdx );
 validatePolygon( *polygon );
 }
 else
 {
 // either remove a hole or the polygon when there are <= 3 corners
 if( vertexIdx.m_contour > 0 )
 {
 // remove hole
 commit.Modify( item );
 polygon->RemoveContour( vertexIdx.m_contour );
 }
 else
 {
 m_toolMgr->RunAction( PCB_ACTIONS::selectionClear, true );
 commit.Remove( item );
 }
 }
 
 setEditedPoint( nullptr );
 
 commit.Push( _( "Remove a zone/polygon corner" ) );
 
 // Refresh zone hatching
 if( item->Type() == PCB_ZONE_T || item->Type() == PCB_FP_ZONE_T )
 static_cast<ZONE*>( item )->HatchBorder();
 
 updatePoints();
 }
 
 return 0;
}
 
 
int PCB_POINT_EDITOR::modifiedSelection( const TOOL_EVENT& aEvent )
{
 updatePoints();
 return 0;
}
 
 
int PCB_POINT_EDITOR::changeArcEditMode( const TOOL_EVENT& aEvent )
{
 PCB_BASE_EDIT_FRAME* editFrame = getEditFrame<PCB_BASE_EDIT_FRAME>();
 
 if( aEvent.Matches( ACTIONS::cycleArcEditMode.MakeEvent() ) )
 {
 if( editFrame->IsType( FRAME_PCB_EDITOR ) )
 m_arcEditMode = editFrame->GetPcbNewSettings()->m_ArcEditMode;
 else
 m_arcEditMode = editFrame->GetFootprintEditorSettings()->m_ArcEditMode;
 
 switch( m_arcEditMode )
 {
 case ARC_EDIT_MODE::KEEP_CENTER_ADJUST_ANGLE_RADIUS:
 m_arcEditMode = ARC_EDIT_MODE::KEEP_ENDPOINTS_OR_START_DIRECTION;
 break;
 case ARC_EDIT_MODE::KEEP_ENDPOINTS_OR_START_DIRECTION:
 m_arcEditMode = ARC_EDIT_MODE::KEEP_CENTER_ADJUST_ANGLE_RADIUS;
 break;
 }
 }
 else
 {
 m_arcEditMode = aEvent.Parameter<ARC_EDIT_MODE>();
 }
 
 if( editFrame->IsType( FRAME_PCB_EDITOR ) )
 editFrame->GetPcbNewSettings()->m_ArcEditMode = m_arcEditMode;
 else
 editFrame->GetFootprintEditorSettings()->m_ArcEditMode = m_arcEditMode;
 
 return 0;
}
 
 
void PCB_POINT_EDITOR::setTransitions()
{
 Go( &PCB_POINT_EDITOR::OnSelectionChange, ACTIONS::activatePointEditor.MakeEvent() );
 Go( &PCB_POINT_EDITOR::addCorner, PCB_ACTIONS::pointEditorAddCorner.MakeEvent() );
 Go( &PCB_POINT_EDITOR::removeCorner, PCB_ACTIONS::pointEditorRemoveCorner.MakeEvent() );
 Go( &PCB_POINT_EDITOR::changeArcEditMode, PCB_ACTIONS::pointEditorArcKeepCenter.MakeEvent() );
 Go( &PCB_POINT_EDITOR::changeArcEditMode, PCB_ACTIONS::pointEditorArcKeepEndpoint.MakeEvent() );
 Go( &PCB_POINT_EDITOR::changeArcEditMode, ACTIONS::cycleArcEditMode.MakeEvent() );
 Go( &PCB_POINT_EDITOR::modifiedSelection, EVENTS::SelectedItemsModified );
 Go( &PCB_POINT_EDITOR::modifiedSelection, EVENTS::SelectedItemsMoved );
 Go( &PCB_POINT_EDITOR::OnSelectionChange, EVENTS::PointSelectedEvent );
 Go( &PCB_POINT_EDITOR::OnSelectionChange, EVENTS::SelectedEvent );
 Go( &PCB_POINT_EDITOR::OnSelectionChange, EVENTS::UnselectedEvent );
 Go( &PCB_POINT_EDITOR::OnSelectionChange, EVENTS::InhibitSelectionEditing );
 Go( &PCB_POINT_EDITOR::OnSelectionChange, EVENTS::UninhibitSelectionEditing );
}