zoom_tool.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2017-2022 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */
 
#include <class_draw_panel_gal.h>
#include <eda_draw_frame.h>
#include <preview_items/selection_area.h>
#include <tool/actions.h>
#include <tool/tool_manager.h>
#include <tool/zoom_tool.h>
#include <view/view.h>
#include <view/view_controls.h>
#include <math/vector2wx.h>
 
 
ZOOM_TOOL::ZOOM_TOOL() :
        TOOL_INTERACTIVE( "common.Control.zoomTool" )
{
    m_frame = nullptr;
}
 
 
ZOOM_TOOL::~ZOOM_TOOL() {}
 
 
 
bool ZOOM_TOOL::Init()
{
    auto& ctxMenu = m_menu->GetMenu();
 
    // cancel current tool goes in main context menu at the top if present
    ctxMenu.AddItem( ACTIONS::cancelInteractive, SELECTION_CONDITIONS::ShowAlways, 1 );
    ctxMenu.AddSeparator( 1 );
 
    // Finally, add the standard zoom/grid items
    getEditFrame<EDA_DRAW_FRAME>()->AddStandardSubMenus( *m_menu.get() );
 
    return true;
}
 
 
void ZOOM_TOOL::Reset( RESET_REASON aReason )
{
    m_frame = getEditFrame<EDA_DRAW_FRAME>();
}
 
 
int ZOOM_TOOL::Main( const TOOL_EVENT& aEvent )
{
    m_frame->PushTool( aEvent );
 
    auto setCursor =
        [&]()
        {
            m_frame->GetCanvas()->SetCurrentCursor( KICURSOR::ZOOM_IN );
        };
 
    // Set initial cursor
    setCursor();
 
    while( TOOL_EVENT* evt = Wait() )
    {
        setCursor();
 
        if( evt->IsCancelInteractive() || evt->IsActivate() )
        {
            break;
        }
        else if( evt->IsDrag( BUT_LEFT ) || evt->IsDrag( BUT_RIGHT ) )
        {
            if( selectRegion() )
                break;
        }
        else if( evt->IsClick( BUT_RIGHT ) )
        {
            SELECTION dummy;
            m_menu->ShowContextMenu( dummy );
        }
        else
        {
            evt->SetPassEvent();
        }
    }
 
    // Exit zoom tool
    m_frame->GetCanvas()->SetCurrentCursor( KICURSOR::ARROW );
    m_frame->PopTool( aEvent );
    return 0;
}
 
 
bool ZOOM_TOOL::selectRegion()
{
    bool                cancelled = false;
    KIGFX::VIEW*        view = getView();
    EDA_DRAW_PANEL_GAL* canvas = m_frame->GetCanvas();
 
    getViewControls()->SetAutoPan( true );
 
    KIGFX::PREVIEW::SELECTION_AREA area;
    view->Add( &area );
 
    while( TOOL_EVENT* evt = Wait() )
    {
        if( evt->IsCancelInteractive() || evt->IsActivate() )
        {
            cancelled = true;
            break;
        }
 
        if( evt->IsDrag( BUT_LEFT ) || evt->IsDrag( BUT_RIGHT ) )
        {
            area.SetOrigin( evt->DragOrigin() );
            area.SetEnd( evt->Position() );
            view->SetVisible( &area, true );
            view->Update( &area, KIGFX::GEOMETRY );
        }
 
        if( evt->IsMouseUp( BUT_LEFT ) || evt->IsMouseUp( BUT_RIGHT ) )
        {
            view->SetVisible( &area, false );
            auto selectionBox = area.ViewBBox();
 
            if( selectionBox.GetWidth() == 0 || selectionBox.GetHeight() == 0 )
            {
                break;
            }
            else
            {
                VECTOR2D sSize = view->ToWorld( ToVECTOR2I( canvas->GetClientSize() ), false );
                VECTOR2D vSize = selectionBox.GetSize();
                double scale;
                double ratio = std::max( fabs( vSize.x / sSize.x ), fabs( vSize.y / sSize.y ) );
 
                if( evt->IsMouseUp( BUT_LEFT ) )
                    scale = view->GetScale() / ratio;
                else
                    scale = view->GetScale() * ratio;
 
                view->SetScale( scale );
                view->SetCenter( selectionBox.Centre() );
 
                break;
            }
        }
    }
 
    view->SetVisible( &area, false );
    view->Remove( &area );
    getViewControls()->SetAutoPan( false );
 
    return cancelled;
}
 
 
void ZOOM_TOOL::setTransitions()
{
    Go( &ZOOM_TOOL::Main, ACTIONS::zoomTool.MakeEvent() );
}