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feat(CMYK): Add a specific preview for CMYK color
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| Original file line number | Diff line number | Diff line change |
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| /*************************************************************************** | ||
| qgscolortooltip_p.h | ||
| --------------------- | ||
| begin : 2024/08/21 | ||
| copyright : (C) 2024 by Julien Cabieces | ||
| email : julien dot cabieces at oslandia dot com | ||
| *************************************************************************** | ||
| * * | ||
| * 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. * | ||
| * * | ||
| ***************************************************************************/ | ||
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| #ifndef QGSCOLORTOOLTIP_P_H | ||
| #define QGSCOLORTOOLTIP_P_H | ||
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| #include <QPainter> | ||
| #include <QBuffer> | ||
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| #include "qgssymbollayerutils.h" | ||
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| //! helper class to generate color tooltip | ||
| class QgsColorTooltip | ||
| { | ||
| public: | ||
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| //! Returns an HTML desciption given a \a color with a preview image of the color | ||
| template<typename T> | ||
| static QString htmlDescription( QColor color, T *widget ) | ||
| { | ||
| // create very large preview swatch | ||
| const int width = static_cast< int >( Qgis::UI_SCALE_FACTOR * widget->fontMetrics().horizontalAdvance( 'X' ) * 23 ); | ||
| const int height = static_cast< int >( width / 1.61803398875 ); // golden ratio | ||
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| const int margin = static_cast< int >( height * 0.1 ); | ||
| QImage icon = QImage( width + 2 * margin, height + 2 * margin, QImage::Format_ARGB32 ); | ||
| icon.fill( Qt::transparent ); | ||
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| QPainter p; | ||
| p.begin( &icon ); | ||
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| //start with checkboard pattern | ||
| const QBrush checkBrush = QBrush( widget->transparentBackground() ); | ||
| p.setPen( Qt::NoPen ); | ||
| p.setBrush( checkBrush ); | ||
| p.drawRect( margin, margin, width, height ); | ||
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| //draw color over pattern | ||
| p.setBrush( QBrush( color ) ); | ||
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| //draw border | ||
| p.setPen( QColor( 197, 197, 197 ) ); | ||
| p.drawRect( margin, margin, width, height ); | ||
| p.end(); | ||
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| QByteArray data; | ||
| QBuffer buffer( &data ); | ||
| icon.save( &buffer, "PNG", 100 ); | ||
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| QString info = QStringLiteral( "<b>HEX</b> %1<br>" ).arg( color.name() ); | ||
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| if ( color.spec() == QColor::Spec::Cmyk ) | ||
| { | ||
| const float cyan = color.cyanF() * 100.f; | ||
| const float magenta = color.magentaF() * 100.f; | ||
| const float yellow = color.yellowF() * 100.f; | ||
| const float black = color.blackF() * 100.f; | ||
| const float alpha = color.alphaF() * 100.f; | ||
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| info += QStringLiteral( "<b>CMYKA</b> %1,%2,%3,%4,%5<p>" ) | ||
| .arg( cyan, 0, 'f', 2 ).arg( magenta, 0, 'f', 2 ) | ||
| .arg( yellow, 0, 'f', 2 ).arg( black, 0, 'f', 2 ) | ||
| .arg( alpha, 0, 'f', 2 ); | ||
| } | ||
| else | ||
| { | ||
| const int hue = color.hue(); | ||
| const int value = color.value(); | ||
| const int saturation = color.saturation(); | ||
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| info += QStringLiteral( "<b>RGB</b> %1<br>" | ||
| "<b>HSV</b> %2,%3,%4<p>" ).arg( QgsSymbolLayerUtils::encodeColor( color ) ) | ||
| .arg( hue ).arg( saturation ).arg( value ); | ||
| } | ||
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| info += QStringLiteral( "<img src='data:image/png;base64, %1'>" ).arg( QString( data.toBase64() ) ); | ||
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| return info; | ||
| } | ||
| }; | ||
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| #endif |