43 , mSettings( settings )
44 , mMinimumValue( minimumValue )
45 , mMaximumValue( maximumValue )
55 connect( nodeLayer, &QObject::destroyed,
this, [
this]() {
mLayerNode =
nullptr; } );
73QString QgsColorRampLegendNode::labelForMinimum()
const
82QString QgsColorRampLegendNode::labelForMaximum()
const
93 if ( role == Qt::DisplayRole )
97 else if ( role == Qt::EditRole )
101 else if ( role == Qt::DecorationRole )
103 if ( mPixmap.isNull() || mPixmap.size() != mIconSize )
105 const QFont font =
data( Qt::FontRole ).value< QFont >();
107 const QString minLabel = labelForMinimum();
108 const QString maxLabel = labelForMaximum();
110 const QFontMetrics fm( font );
112 const QRect minBoundingRect = fm.boundingRect( minLabel );
113 const QRect maxBoundingRect = fm.boundingRect( maxLabel );
115 const int minLabelWidth = minBoundingRect.width();
116 const int maxLabelWidth = maxBoundingRect.width();
117 const int maxTextWidth = std::max( minLabelWidth, maxLabelWidth );
118 const int labelGapFromRamp = fm.boundingRect( QStringLiteral(
"x" ) ).width();
119 const int extraAllowance = labelGapFromRamp * 0.4;
125 labelRect = QRect( mIconSize.width() + labelGapFromRamp, 0, maxTextWidth + extraAllowance, mIconSize.height() );
126 mPixmap = QPixmap( mIconSize.width() + maxTextWidth + labelGapFromRamp + extraAllowance, mIconSize.height() );
127 rampSize = mIconSize;
131 labelRect = QRect( 0, mIconSize.height() + labelGapFromRamp, std::max( mIconSize.width(), minLabelWidth + maxLabelWidth + labelGapFromRamp ), std::max( minBoundingRect.height(),
132 maxBoundingRect.height() ) + extraAllowance );
133 mPixmap = QPixmap( std::max( mIconSize.width(), minLabelWidth + maxLabelWidth + labelGapFromRamp ), mIconSize.height() + maxTextWidth + labelGapFromRamp + extraAllowance );
134 rampSize = QSize( labelRect.width(), mIconSize.height() );
138 mPixmap.fill( Qt::transparent );
151 pix = QPixmap( rampSize );
152 pix.fill( Qt::transparent );
155 QPainter p( &mPixmap );
156 p.drawPixmap( 0, 0, pix );
158 p.setPen( qApp->palette().color( QPalette::Text ) );
194 std::unique_ptr< QgsRenderContext > tempRenderContext;
199 tempRenderContext = std::make_unique< QgsRenderContext >();
202 tempRenderContext->setScaleFactor(
settings.dpi() / 25.4 );
203 tempRenderContext->setRendererScale(
settings.mapScale() );
205 tempRenderContext->setMapToPixel(
QgsMapToPixel( 1 / (
settings.mmPerMapUnit() * tempRenderContext->scaleFactor() ) ) );
207 tempRenderContext->setForceVectorOutput(
true );
208 tempRenderContext->setPainter( ctx ? ctx->
painter : nullptr );
213 tempRenderContext->setExpressionContext( expContext );
214 context = tempRenderContext.get();
218 const QString minLabel = labelForMinimum();
219 const QString maxLabel = labelForMaximum();
224 double minHeightMm = 0;
225 double minWidthMm = 0;
226 double rampHeight = 0;
227 double rampWidth = 0;
233 rampHeight = ctx && ctx->
patchSize.height() > 0 ? std::max( minHeightMm / 2, ctx->
patchSize.height() ) : std::max( minHeightMm,
settings.symbolSize().height() );
234 rampWidth = patchWidth;
241 rampHeight = patchHeight;
242 rampWidth = std::max( minWidthMm, patchWidth );
248 const double currentYCoord = ctx->
top;
256 opacity = layer->opacity();
261 double rampLeftMm = 0;
262 const double rampTopMm = currentYCoord;
263 switch (
settings.symbolAlignment() )
275 p->scale( 1.0 / dotsPerMM, 1.0 / dotsPerMM );
277 QLinearGradient gradient;
282 const double gradientTop = rampTopMm * dotsPerMM;
283 const double gradientBottom = gradientTop + rampHeight * dotsPerMM;
291 const double gradientLeft = rampLeftMm * dotsPerMM;
292 const double gradientRight = gradientLeft + rampWidth * dotsPerMM;
310 pen.setColor(
settings.rasterStrokeColor() );
311 pen.setWidthF(
settings.rasterStrokeWidth() * dotsPerMM );
312 pen.setJoinStyle( Qt::MiterJoin );
317 ctx->
painter->setPen( Qt::NoPen );
320 p->setBrush( QBrush( gradient ) );
321 p->drawRect( rampLeftMm * dotsPerMM, rampTopMm * dotsPerMM, rampWidth * dotsPerMM, rampHeight * dotsPerMM );
324 double labelHeight = 0;
330 const double currentYCoord = ctx->
top;
339 p->scale( 1.0 / dotsPerMM, 1.0 / dotsPerMM );
341 double labelXMin = 0;
342 double labelXMax = 0;
350 switch (
settings.symbolAlignment() )
364 const QRectF textRect( labelXMin * dotsPerMM, labelYMin * dotsPerMM, ( labelXMax - labelXMin ) * dotsPerMM, labelHeight * dotsPerMM );
382 return QSizeF( rampWidth, rampHeight + labelHeight );
387 if ( !mRamp || mSettings.
orientation() == Qt::Horizontal )
394 std::unique_ptr< QgsRenderContext > tempRenderContext;
399 tempRenderContext = std::make_unique< QgsRenderContext >();
402 tempRenderContext->setScaleFactor(
settings.dpi() / 25.4 );
403 tempRenderContext->setRendererScale(
settings.mapScale() );
405 tempRenderContext->setMapToPixel(
QgsMapToPixel( 1 / (
settings.mmPerMapUnit() * tempRenderContext->scaleFactor() ) ) );
407 tempRenderContext->setForceVectorOutput(
true );
408 tempRenderContext->setPainter( ctx ? ctx->
painter : nullptr );
413 tempRenderContext->setExpressionContext( expContext );
414 context = tempRenderContext.get();
419 const QString minLabel = labelForMinimum();
420 const QString maxLabel = labelForMaximum();
422 const double rampHeight = symbolSize.height();
423 const double rampWidth = symbolSize.width();
424 double textWidth = 0;
425 double textHeight = 0;
429 const double currentYCoord = ctx->
top;
438 p->scale( 1.0 / dotsPerMM, 1.0 / dotsPerMM );
440 double labelXMin = 0;
441 double labelXMax = 0;
442 switch (
settings.symbolAlignment() )
463 const QRectF textRect( labelXMin * dotsPerMM, currentYCoord * dotsPerMM, ( labelXMax - labelXMin ) * dotsPerMM, rampHeight * dotsPerMM );
475 textHeight = rampHeight;
478 return QSizeF( textWidth, textHeight );
488 const QPixmap icon =
data( Qt::DecorationRole ).value<QPixmap>();
490 if ( ! icon.isNull() )
492 const QImage image( icon.toImage() );
493 QByteArray byteArray;
494 QBuffer buffer( &byteArray );
495 image.save( &buffer,
"PNG" );
496 const QString base64 = QString::fromLatin1( byteArray.toBase64().data() );
497 json[ QStringLiteral(
"icon" ) ] = base64;
500 json [ QStringLiteral(
"min" ) ] = mMinimumValue;
501 json [ QStringLiteral(
"max" ) ] = mMaximumValue;
@ 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.
QJsonObject exportSymbolToJson(const QgsLegendSettings &settings, const QgsRenderContext &context) const override
Adds a symbol in base64 string within a JSON object with the key "icon".
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.
@ NodeType
Type of node. Added in 3.16.
QgsLayerTreeLayer * mLayerNode
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.