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Export label symbol also to json

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This commit is contained in:
Marco Hugentobler 2021-05-07 15:05:25 +02:00
parent bdccfc2794
commit 8da3d112c5
3 changed files with 64 additions and 13 deletions
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2
python/core/auto_generated/layertree/qgslayertreemodellegendnode.sip.in
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@ -687,6 +687,8 @@ Returns data associated with the item.
%End
virtual QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const;
virtual QJsonObject exportSymbolToJson( const QgsLegendSettings &settings, const QgsRenderContext &context ) const;
};

72
src/core/layertree/qgslayertreemodellegendnode.cpp
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@ -1459,6 +1459,63 @@ QVariant QgsVectorLabelLegendNode::data( int role ) const
QSizeF QgsVectorLabelLegendNode::drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const
{
Q_UNUSED( itemHeight );
if ( !ctx )
{
return QSizeF( 0, 0 );
}
return drawSymbol( settings, ctx->painter, ctx->columnLeft, ctx->top );
}
QSizeF QgsVectorLabelLegendNode::drawSymbol( const QgsLegendSettings &settings, QPainter *p, double xOffset, double yOffset ) const
{
QColor textColor;
QFont f = font( textColor );
double textHeight = settings.fontHeightCharacterMM( f, QChar( 'A' ) );
double textWidth = settings.textWidthMillimeters( f, "Aa" );
if ( p )
{
p->setPen( textColor );
settings.drawText( p, xOffset + settings.symbolSize().width() / 2.0 - textWidth / 2.0, yOffset + settings.symbolSize().height() / 2.0 + textHeight / 2.0, "Aa", f );
}
double symbolWidth = qMax( textWidth, settings.symbolSize().width() );
double symbolHeight = qMax( textHeight, settings.symbolSize().height() );
return QSizeF( symbolWidth, symbolHeight );
}
QJsonObject QgsVectorLabelLegendNode::exportSymbolToJson( const QgsLegendSettings &settings, const QgsRenderContext &context ) const
{
QColor textColor;
QFont f = font( textColor );
double textHeight = settings.fontHeightCharacterMM( f, QChar( 'A' ) );
double textWidth = settings.textWidthMillimeters( f, "Aa" );
double mmToPixel = 96.0 / 25.4; //settings.dpi() is deprecated
int widthPixel = mmToPixel * textWidth;
int heightPixel = mmToPixel * textHeight;
QImage img( widthPixel, heightPixel, QImage::Format_ARGB32 );
img.fill( QColor( 255, 255, 255, 255 ) );
QPainter p( &img );
p.scale( mmToPixel, mmToPixel );
drawSymbol( settings, &p );
QByteArray byteArray;
QBuffer buffer( &byteArray );
img.save( &buffer, "PNG" );
const QString base64 = QString::fromLatin1( byteArray.toBase64().data() );
QJsonObject json;
json[ QStringLiteral( "icon" ) ] = base64;
return json;
}
QFont QgsVectorLabelLegendNode::font( QColor &c ) const
{
QgsTextFormat textFormat = mLabelSettings.format();
QFont font = textFormat.font();
QgsUnitTypes::RenderUnit fontSizeUnit = textFormat.sizeUnit();
@ -1472,18 +1529,7 @@ QSizeF QgsVectorLabelLegendNode::drawSymbol( const QgsLegendSettings &settings,
size = 12; //render in a standard size
}
font.setPointSizeF( size );
double textHeight = settings.fontHeightCharacterMM( font, QChar( 'A' ) );
double textWidth = settings.textWidthMillimeters( font, "Aa" );
if ( ctx && ctx->painter )
{
ctx->painter->setPen( textFormat.color() );
settings.drawText( ctx->painter, ctx->columnLeft + settings.symbolSize().width() / 2.0 - textWidth / 2.0, ctx->top + settings.symbolSize().height() / 2.0 + textHeight / 2.0, "Aa", font );
}
double symbolWidth = qMax( textWidth, settings.symbolSize().width() );
double symbolHeight = qMax( textHeight, settings.symbolSize().height() );
return QSizeF( symbolWidth, symbolHeight );
c = textFormat.color();
return font;
}

3
src/core/layertree/qgslayertreemodellegendnode.h
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@ -737,9 +737,12 @@ class CORE_EXPORT QgsVectorLabelLegendNode : public QgsLayerTreeModelLegendNode
//! Returns data associated with the item.
QVariant data( int role ) const override;
QSizeF drawSymbol( const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight ) const override;
QJsonObject exportSymbolToJson( const QgsLegendSettings &settings, const QgsRenderContext &context ) const override;
private:
QgsPalLayerSettings mLabelSettings;
QSizeF drawSymbol( const QgsLegendSettings &settings, QPainter *p, double xOffset = 0.0, double yOffset = 0.0 ) const;
QFont font( QColor &c ) const;
};