QgsRasterDrawer Class Reference

The drawing pipe for raster layers. More...

#include <qgsrasterdrawer.h>

Public Member Functions
	QgsRasterDrawer (QgsRasterIterator *iterator)
	The QgsRasterDrawer constructor.
Q_DECL_DEPRECATED	QgsRasterDrawer (QgsRasterIterator *iterator, double dpiTarget)
	The QgsRasterDrawer constructor.
void	draw (QgsRenderContext &context, QgsRasterViewPort *viewPort, QgsRasterBlockFeedback *feedback=nullptr)
	Draws raster data.
void	draw (QPainter *p, QgsRasterViewPort *viewPort, const QgsMapToPixel *qgsMapToPixel, QgsRasterBlockFeedback *feedback=nullptr)
	Draws raster data.

Protected Member Functions
void	drawImage (QPainter *p, QgsRasterViewPort *viewPort, const QImage &img, int topLeftCol, int topLeftRow, const QgsMapToPixel *mapToPixel=nullptr) const
	Draws raster part.

Detailed Description

The drawing pipe for raster layers.

Definition at line 37 of file qgsrasterdrawer.h.

Constructor & Destructor Documentation

QgsRasterDrawer() [1/2]

QgsRasterDrawer::QgsRasterDrawer	(	QgsRasterIterator *	iterator,
		double	dpiTarget
	)

The QgsRasterDrawer constructor.

Parameters

iterator	the raster iterator to fetch data from
dpiTarget	the target dpi (dots per inch) to be taken into consideration when rendering

Deprecated:

QGIS 3.28. Use the constructor without the dpiTarget argument instead, as DPI is now handled by the draw() method which accepts a QgsRenderContext.

Definition at line 30 of file qgsrasterdrawer.cpp.

QgsRasterDrawer() [2/2]

QgsRasterDrawer::QgsRasterDrawer

(

QgsRasterIterator *

iterator

)

The QgsRasterDrawer constructor.

Parameters

iterator

the raster iterator to fetch data from

Definition at line 36 of file qgsrasterdrawer.cpp.

Member Function Documentation

draw() [1/2]

void QgsRasterDrawer::draw	(	QgsRenderContext &	context,
		QgsRasterViewPort *	viewPort,
		QgsRasterBlockFeedback *	feedback = nullptr
	)

Draws raster data.

Parameters

context	the render context
viewPort	viewport to render
feedback	optional raster feedback object for cancellation/preview.

Since

QGIS 3.28

Definition at line 41 of file qgsrasterdrawer.cpp.

draw() [2/2]

void QgsRasterDrawer::draw	(	QPainter *	p,
		QgsRasterViewPort *	viewPort,
		const QgsMapToPixel *	qgsMapToPixel,
		QgsRasterBlockFeedback *	feedback = nullptr
	)

Draws raster data.

Parameters

p	destination QPainter
viewPort	viewport to render
qgsMapToPixel	map to pixel converter
feedback	optional raster feedback object for cancellation/preview. Added in QGIS 3.0.

Definition at line 49 of file qgsrasterdrawer.cpp.

drawImage()

void QgsRasterDrawer::drawImage ( QPainter *  p, QgsRasterViewPort *  viewPort, const QImage &  img, int  topLeftCol, int  topLeftRow, const QgsMapToPixel *  mapToPixel = nullptr  ) const

protected

Draws raster part.

Parameters

p	the painter to draw to
viewPort	view port to draw to
img	image to draw
topLeftCol	Left position relative to left border of viewport
topLeftRow	Top position relative to top border of viewport
mapToPixel	map to device coordinate transformation info

Note

not available in Python bindings

Definition at line 134 of file qgsrasterdrawer.cpp.

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The documentation for this class was generated from the following files:

• /build/qgis-3.41.0+git20241116+25ec5511245+99sid/src/core/raster/qgsrasterdrawer.h
• /build/qgis-3.41.0+git20241116+25ec5511245+99sid/src/core/raster/qgsrasterdrawer.cpp