preview_utils.cpp

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/*
 * This program source code file is part of KICAD, a free EDA CAD application.
 *
 * Copyright (C) 2019-2023 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 <preview_items/preview_utils.h>
#include <gal/graphics_abstraction_layer.h>
#include <base_units.h>
#include <gal/painter.h>
#include <view/view.h>
#include <gal/hidpi_gl_canvas.h>
 
double KIGFX::PREVIEW::PreviewOverlayDeemphAlpha( bool aDeemph )
{
 return aDeemph ? 0.5 : 1.0;
}
 
 
wxString KIGFX::PREVIEW::DimensionLabel( const wxString& prefix, double aVal,
 const EDA_IU_SCALE& aIuScale, EDA_UNITS aUnits,
 bool aIncludeUnits )
{
 wxString str;
 
 if( prefix.size() )
 str << prefix << ": ";
 
 wxString fmtStr;
 
 // show a sane precision for the preview, which doesn't need to be accurate down to the
 // nanometre
 switch( aUnits )
 {
 case EDA_UNITS::MILLIMETRES: fmtStr = wxT( "%.3f" ); break; // 1um
 case EDA_UNITS::MILS: fmtStr = wxT( "%.1f" ); break; // 0.1mil
 case EDA_UNITS::INCHES: fmtStr = wxT( "%.4f" ); break; // 0.1mil
 case EDA_UNITS::DEGREES: fmtStr = wxT( "%.1f" ); break; // 0.1deg
 case EDA_UNITS::PERCENT: fmtStr = wxT( "%.1f" ); break; // 0.1%
 case EDA_UNITS::UNSCALED: fmtStr = wxT( "%f" ); break;
 }
 
 str << wxString::Format( fmtStr, EDA_UNIT_UTILS::UI::ToUserUnit( aIuScale, aUnits, aVal ) );
 
 if( aIncludeUnits )
 str << EDA_UNIT_UTILS::GetText( aUnits );
 
 return str;
}
 
 
KIGFX::PREVIEW::TEXT_DIMS KIGFX::PREVIEW::GetConstantGlyphHeight( KIGFX::GAL* aGal,
 int aRelativeSize )
{
 constexpr double aspectRatio = 1.0;
 constexpr double hdpiSizes[] = { 8, 9, 11, 13, 15 };
 constexpr double sizes[] = { 10, 12, 14, 16, 18 };
 
 double height;
 double thicknessFactor;
 double shadowFactor;
 double linePitchFactor;
 
 HIDPI_GL_CANVAS* canvas = dynamic_cast<HIDPI_GL_CANVAS*>( aGal );
 
 if( canvas && canvas->GetScaleFactor() > 1 )
 {
 height = hdpiSizes[ 2 + aRelativeSize ];
 thicknessFactor = 0.15;
 shadowFactor = 0.10;
 linePitchFactor = 1.7;
 }
 else
 {
 height = sizes[ 2 + aRelativeSize ];
 thicknessFactor = 0.20;
 shadowFactor = 0.15;
 linePitchFactor = 1.9;
 }
 
 height /= aGal->GetWorldScale();
 
 TEXT_DIMS textDims;
 
 textDims.GlyphSize = VECTOR2I( height * aspectRatio, height );
 textDims.StrokeWidth = height * thicknessFactor;
 textDims.ShadowWidth = height * shadowFactor;
 textDims.LinePitch = height * linePitchFactor;
 
 return textDims;
}
 
 
KIGFX::COLOR4D KIGFX::PREVIEW::GetShadowColor( const KIGFX::COLOR4D& aColor )
{
 if( aColor.GetBrightness() > 0.5 )
 return COLOR4D::BLACK;
 else
 return COLOR4D::WHITE;
}
 
 
void KIGFX::PREVIEW::DrawTextNextToCursor( KIGFX::VIEW* aView, const VECTOR2D& aCursorPos,
 const VECTOR2D& aTextQuadrant,
 const std::vector<wxString>& aStrings,
 bool aDrawingDropShadows )
{
 KIGFX::GAL* gal = aView->GetGAL();
 KIFONT::FONT* font = KIFONT::FONT::GetFont();
 
 // constant text size on screen
 TEXT_DIMS textDims = GetConstantGlyphHeight( gal );
 TEXT_ATTRIBUTES textAttrs;
 
 // radius string goes on the right of the cursor centre line with a small horizontal
 // offset (enough to keep clear of a system cursor if present)
 VECTOR2D textPos = aCursorPos;
 
 bool viewFlipped = gal->IsFlippedX();
 
 // if the text goes above the cursor, shift it up
 if( aTextQuadrant.y > 0 )
 textPos.y -= textDims.LinePitch * ( aStrings.size() + 1 );
 
 if( aTextQuadrant.x < 0 )
 {
 if( viewFlipped )
 textAttrs.m_Halign = GR_TEXT_H_ALIGN_RIGHT;
 else
 textAttrs.m_Halign = GR_TEXT_H_ALIGN_LEFT;
 
 textPos.x += 15.0 / gal->GetWorldScale();
 }
 else
 {
 if( viewFlipped )
 textAttrs.m_Halign = GR_TEXT_H_ALIGN_LEFT;
 else
 textAttrs.m_Halign = GR_TEXT_H_ALIGN_RIGHT;
 
 textPos.x -= 15.0 / gal->GetWorldScale();
 }
 
 // text is left (or right) aligned, so a shadow text need a small offset to be draw
 // around the basic text
 int shadowXoffset = aDrawingDropShadows ? textDims.ShadowWidth : 0;
 
 // Due to the fact a shadow text is drawn left or right aligned,
 // it needs an offset = shadowWidth/2 to be drawn at the same place as normal text
 // But for some reason we need to slightly modify this offset
 // for a better look for KiCad font (better alignment of shadow shape)
 const float adjust = 1.2f; // Value chosen after tests
 shadowXoffset *= adjust;
 
 if( ( textAttrs.m_Halign == GR_TEXT_H_ALIGN_LEFT ) != viewFlipped )
 textPos.x -= shadowXoffset;
 else
 textPos.x += shadowXoffset;
 
 gal->SetStrokeColor( aView->GetPainter()->GetSettings()->GetLayerColor( LAYER_AUX_ITEMS ) );
 textAttrs.m_Mirrored = viewFlipped; // Prevent text flipping when view is flipped
 textAttrs.m_Size = textDims.GlyphSize;
 textAttrs.m_StrokeWidth = textDims.StrokeWidth;
 gal->SetIsFill( false );
 gal->SetIsStroke( true );
 
 if( aDrawingDropShadows )
 {
 textAttrs.m_StrokeWidth = textDims.StrokeWidth + ( 2 * textDims.ShadowWidth );
 gal->SetStrokeColor( GetShadowColor( gal->GetStrokeColor() ) );
 }
 
 // write strings top-to-bottom
 for( const wxString& str : aStrings )
 {
 textPos.y += textDims.LinePitch;
 font->Draw( gal, str, textPos, textAttrs, KIFONT::METRICS::Default() );
 }
}