42 , mSettings( settings )
43 , mMinimumValue( minimumValue )
44 , mMaximumValue( maximumValue )
54 connect( nodeLayer, &QObject::destroyed,
this, [ = ]() {
mLayerNode =
nullptr; } );
72QString QgsColorRampLegendNode::labelForMinimum()
const
81QString QgsColorRampLegendNode::labelForMaximum()
const
92 if ( role == Qt::DisplayRole )
96 else if ( role == Qt::EditRole )
100 else if ( role == Qt::DecorationRole )
102 if ( mPixmap.isNull() || mPixmap.size() != mIconSize )
104 const QFont font =
data( Qt::FontRole ).value< QFont >();
106 const QString minLabel = labelForMinimum();
107 const QString maxLabel = labelForMaximum();
109 const QFontMetrics fm( font );
111 const QRect minBoundingRect = fm.boundingRect( minLabel );
112 const QRect maxBoundingRect = fm.boundingRect( maxLabel );
114 const int minLabelWidth = minBoundingRect.width();
115 const int maxLabelWidth = maxBoundingRect.width();
116 const int maxTextWidth = std::max( minLabelWidth, maxLabelWidth );
117 const int labelGapFromRamp = fm.boundingRect( QStringLiteral(
"x" ) ).width();
118 const int extraAllowance = labelGapFromRamp * 0.4;
124 labelRect = QRect( mIconSize.width() + labelGapFromRamp, 0, maxTextWidth + extraAllowance, mIconSize.height() );
125 mPixmap = QPixmap( mIconSize.width() + maxTextWidth + labelGapFromRamp + extraAllowance, mIconSize.height() );
126 rampSize = mIconSize;
130 labelRect = QRect( 0, mIconSize.height() + labelGapFromRamp, std::max( mIconSize.width(), minLabelWidth + maxLabelWidth + labelGapFromRamp ), std::max( minBoundingRect.height(),
131 maxBoundingRect.height() ) + extraAllowance );
132 mPixmap = QPixmap( std::max( mIconSize.width(), minLabelWidth + maxLabelWidth + labelGapFromRamp ), mIconSize.height() + maxTextWidth + labelGapFromRamp + extraAllowance );
133 rampSize = QSize( labelRect.width(), mIconSize.height() );
137 mPixmap.fill( Qt::transparent );
150 pix = QPixmap( rampSize );
151 pix.fill( Qt::transparent );
154 QPainter p( &mPixmap );
155 p.drawPixmap( 0, 0, pix );
157 p.setPen( qApp->palette().color( QPalette::Text ) );
193 std::unique_ptr< QgsRenderContext > tempRenderContext;
198 tempRenderContext = std::make_unique< QgsRenderContext >();
201 tempRenderContext->setScaleFactor(
settings.dpi() / 25.4 );
202 tempRenderContext->setRendererScale(
settings.mapScale() );
204 tempRenderContext->setMapToPixel(
QgsMapToPixel( 1 / (
settings.mmPerMapUnit() * tempRenderContext->scaleFactor() ) ) );
206 tempRenderContext->setForceVectorOutput(
true );
207 tempRenderContext->setPainter( ctx ? ctx->
painter : nullptr );
212 tempRenderContext->setExpressionContext( expContext );
213 context = tempRenderContext.get();
217 const QString minLabel = labelForMinimum();
218 const QString maxLabel = labelForMaximum();
223 double minHeightMm = 0;
224 double minWidthMm = 0;
225 double rampHeight = 0;
226 double rampWidth = 0;
232 rampHeight = ctx && ctx->
patchSize.height() > 0 ? std::max( minHeightMm / 2, ctx->
patchSize.height() ) : std::max( minHeightMm,
settings.symbolSize().height() );
233 rampWidth = patchWidth;
240 rampHeight = patchHeight;
241 rampWidth = std::max( minWidthMm, patchWidth );
247 const double currentYCoord = ctx->
top;
255 opacity = layer->opacity();
260 double rampLeftMm = 0;
261 const double rampTopMm = currentYCoord;
262 switch (
settings.symbolAlignment() )
274 p->scale( 1.0 / dotsPerMM, 1.0 / dotsPerMM );
276 QLinearGradient gradient;
281 const double gradientTop = rampTopMm * dotsPerMM;
282 const double gradientBottom = gradientTop + rampHeight * dotsPerMM;
290 const double gradientLeft = rampLeftMm * dotsPerMM;
291 const double gradientRight = gradientLeft + rampWidth * dotsPerMM;
309 pen.setColor(
settings.rasterStrokeColor() );
310 pen.setWidthF(
settings.rasterStrokeWidth() * dotsPerMM );
311 pen.setJoinStyle( Qt::MiterJoin );
316 ctx->
painter->setPen( Qt::NoPen );
319 p->setBrush( QBrush( gradient ) );
320 p->drawRect( rampLeftMm * dotsPerMM, rampTopMm * dotsPerMM, rampWidth * dotsPerMM, rampHeight * dotsPerMM );
323 double labelHeight = 0;
329 const double currentYCoord = ctx->
top;
338 p->scale( 1.0 / dotsPerMM, 1.0 / dotsPerMM );
340 double labelXMin = 0;
341 double labelXMax = 0;
349 switch (
settings.symbolAlignment() )
363 const QRectF textRect( labelXMin * dotsPerMM, labelYMin * dotsPerMM, ( labelXMax - labelXMin ) * dotsPerMM, labelHeight * dotsPerMM );
381 return QSizeF( rampWidth, rampHeight + labelHeight );
386 if ( !mRamp || mSettings.
orientation() == Qt::Horizontal )
393 std::unique_ptr< QgsRenderContext > tempRenderContext;
398 tempRenderContext = std::make_unique< QgsRenderContext >();
401 tempRenderContext->setScaleFactor(
settings.dpi() / 25.4 );
402 tempRenderContext->setRendererScale(
settings.mapScale() );
404 tempRenderContext->setMapToPixel(
QgsMapToPixel( 1 / (
settings.mmPerMapUnit() * tempRenderContext->scaleFactor() ) ) );
406 tempRenderContext->setForceVectorOutput(
true );
407 tempRenderContext->setPainter( ctx ? ctx->
painter : nullptr );
412 tempRenderContext->setExpressionContext( expContext );
413 context = tempRenderContext.get();
418 const QString minLabel = labelForMinimum();
419 const QString maxLabel = labelForMaximum();
421 const double rampHeight = symbolSize.height();
422 const double rampWidth = symbolSize.width();
423 double textWidth = 0;
424 double textHeight = 0;
428 const double currentYCoord = ctx->
top;
437 p->scale( 1.0 / dotsPerMM, 1.0 / dotsPerMM );
439 double labelXMin = 0;
440 double labelXMax = 0;
441 switch (
settings.symbolAlignment() )
462 const QRectF textRect( labelXMin * dotsPerMM, currentYCoord * dotsPerMM, ( labelXMax - labelXMin ) * dotsPerMM, rampHeight * dotsPerMM );
474 textHeight = rampHeight;
477 return QSizeF( textWidth, textHeight );
@ Rectangle
Text within rectangle layout mode.
@ Antialiasing
Use antialiasing while drawing.
Settings for a color ramp legend node.
void setMaximumLabel(const QString &label)
Sets the label for the maximum value on the ramp.
const QgsNumericFormat * numericFormat() const
Returns the numeric format used for numbers in the scalebar.
QString maximumLabel() const
Returns the label for the maximum value on the ramp.
QString suffix() const
Returns the suffix to show after legend text.
@ MaximumToMinimum
Maximum value on bottom, minimum value on top.
@ MinimumToMaximum
Minimum value on bottom, maximum value on top.
QString prefix() const
Returns the prefix to show before legend text.
Qt::Orientation orientation() const
Returns the ramp orientation (i.e.
QgsColorRampLegendNodeSettings::Direction direction() const
Returns the direction of the ramp.
QgsTextFormat textFormat() const
Returns the text format used to render text in the legend item.
void setMinimumLabel(const QString &label)
Sets the label for the minimum value on the ramp.
QString minimumLabel() const
Returns the label for the minimum value on the ramp.
QSizeF drawSymbolText(const QgsLegendSettings &settings, ItemContext *ctx, QSizeF symbolSize) const override
Draws label on the right side of the item.
const QgsColorRamp * ramp() const
Returns the color ramp used by the node.
QSize iconSize() const
Returns the icon size, which is how large the ramp will render in a layer tree widget.
void setSettings(const QgsColorRampLegendNodeSettings &settings)
Sets the node's settings.
QgsColorRampLegendNodeSettings settings() const
Returns the node's settings.
QVariant data(int role) const override
Returns data associated with the item. Must be implemented in derived class.
QSizeF drawSymbol(const QgsLegendSettings &settings, ItemContext *ctx, double itemHeight) const override
Draws symbol on the left side of the item.
QgsColorRampLegendNode(QgsLayerTreeLayer *nodeLayer, QgsColorRamp *ramp, const QString &minimumLabel, const QString &maximumLabel, QObject *parent=nullptr)
Constructor for QgsColorRampLegendNode.
Abstract base class for color ramps.
static QString typeString()
Returns the string identifier for QgsCptCityColorRamp.
static QList< QgsExpressionContextScope * > globalProjectLayerScopes(const QgsMapLayer *layer)
Creates a list of three scopes: global, layer's project and layer.
Expression contexts are used to encapsulate the parameters around which a QgsExpression should be eva...
void appendScopes(const QList< QgsExpressionContextScope * > &scopes)
Appends a list of scopes to the end of the context.
Gradient color ramp, which smoothly interpolates between two colors and also supports optional extra ...
static QString typeString()
Returns the string identifier for QgsGradientColorRamp.
void addStopsToGradient(QGradient *gradient, double opacity=1) const
Copy color ramp stops to a QGradient.
Layer tree node points to a map layer.
The QgsLegendRendererItem class is abstract interface for legend items returned from QgsMapLayerLegen...
@ ColorRampLegend
Color ramp legend (since QGIS 3.18)
QgsLayerTreeLayer * mLayerNode
@ NodeTypeRole
Type of node. Added in 3.16.
QgsLayerTreeLayer * layerNode() const
Returns pointer to the parent layer node.
static int scaleIconSize(int standardSize)
Scales an layer tree model icon size to compensate for display pixel density, making the icon size hi...
The QgsLegendSettings class stores the appearance and layout settings for legend drawing with QgsLege...
@ Symbol
Symbol icon (excluding label)
@ SymbolLabel
Symbol label (excluding icon)
Base class for all map layer types.
Perform transforms between map coordinates and device coordinates.
A context for numeric formats.
Contains information about the context of a rendering operation.
double scaleFactor() const
Returns the scaling factor for the render to convert painter units to physical sizes.
void setPainterFlagsUsingContext(QPainter *painter=nullptr) const
Sets relevant flags on a destination painter, using the flags and settings currently defined for the ...
Scoped object for saving and restoring a QPainter object's state.
static QPixmap colorRampPreviewPixmap(QgsColorRamp *ramp, QSize size, int padding=0, Qt::Orientation direction=Qt::Horizontal, bool flipDirection=false, bool drawTransparentBackground=true)
Returns a pixmap preview for a color ramp.
Container for all settings relating to text rendering.
bool isValid() const
Returns true if the format is valid.
static double textWidth(const QgsRenderContext &context, const QgsTextFormat &format, const QStringList &textLines, QFontMetricsF *fontMetrics=nullptr)
Returns the width of a text based on a given format.
static void drawText(const QRectF &rect, double rotation, Qgis::TextHorizontalAlignment alignment, const QStringList &textLines, QgsRenderContext &context, const QgsTextFormat &format, bool drawAsOutlines=true, Qgis::TextVerticalAlignment vAlignment=Qgis::TextVerticalAlignment::Top, Qgis::TextRendererFlags flags=Qgis::TextRendererFlags(), Qgis::TextLayoutMode mode=Qgis::TextLayoutMode::Rectangle)
Draws text within a rectangle using the specified settings.
static double textHeight(const QgsRenderContext &context, const QgsTextFormat &format, const QStringList &textLines, Qgis::TextLayoutMode mode=Qgis::TextLayoutMode::Point, QFontMetricsF *fontMetrics=nullptr, Qgis::TextRendererFlags flags=Qgis::TextRendererFlags(), double maxLineWidth=0)
Returns the height of a text based on a given format.
static Qgis::TextHorizontalAlignment convertQtHAlignment(Qt::Alignment alignment)
Converts a Qt horizontal alignment flag to a Qgis::TextHorizontalAlignment value.
#define Q_NOWARN_DEPRECATED_POP
#define Q_NOWARN_DEPRECATED_PUSH
QPainter * painter
Painter.
double top
Top y-position of legend item.
double maxSiblingSymbolWidth
Largest symbol width, considering all other sibling legend components associated with the current com...
QSizeF patchSize
Symbol patch size to render for the node.
double columnLeft
Left side of current legend column.
double columnRight
Right side of current legend column.
Q_NOWARN_DEPRECATED_POP QgsRenderContext * context
Render context, if available.