QGIS API Documentation
2.2.0-Valmiera
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An abstract class for items that can be placed on the map canvas. More...
#include <qgsmapcanvasitem.h>
Public Member Functions | |
virtual void | updatePosition () |
called on changed extent or resize event to update position of the item | |
virtual QRectF | boundingRect () const |
default implementation for canvas items | |
void | setPanningOffset (const QPoint &point) |
sets current offset, to be called from QgsMapCanvas | |
QgsRectangle | rect () const |
returns canvas item rectangle | |
void | setRect (const QgsRectangle &r) |
sets canvas item rectangle | |
QgsPoint | toMapCoordinates (const QPoint &point) |
transformation from screen coordinates to map coordinates | |
QPointF | toCanvasCoordinates (const QgsPoint &point) |
transformation from map coordinates to screen coordinates |
Protected Member Functions | |
QgsMapCanvasItem (QgsMapCanvas *mapCanvas) | |
protected constructor: cannot be constructed directly | |
virtual | ~QgsMapCanvasItem () |
virtual void | paint (QPainter *painter)=0 |
function to be implemented by derived classes | |
virtual void | paint (QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget=0) |
paint function called by map canvas | |
void | updateCanvas () |
schedules map canvas for repaint | |
bool | setRenderContextVariables (QPainter *p, QgsRenderContext &context) const |
Sets render context parameters. |
Protected Attributes | |
QgsMapCanvas * | mMapCanvas |
pointer to map canvas | |
QgsRectangle | mRect |
canvas item rectangle (in map coordinates) | |
QPoint | mPanningOffset |
offset from normal position due current panning operation, used when converting map coordinates to move map canvas items | |
QSizeF | mItemSize |
cached size of the item (to return in boundingRect()) |
An abstract class for items that can be placed on the map canvas.
Definition at line 30 of file qgsmapcanvasitem.h.
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protected |
protected constructor: cannot be constructed directly
Definition at line 29 of file qgsmapcanvasitem.cpp.
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protectedvirtual |
Definition at line 35 of file qgsmapcanvasitem.cpp.
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virtual |
default implementation for canvas items
Reimplemented in QgsAnnotationItem, and QgsVertexMarker.
Definition at line 96 of file qgsmapcanvasitem.cpp.
References mItemSize.
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protectedpure virtual |
function to be implemented by derived classes
Implemented in QgsRubberBand, QgsHighlight, QgsVertexMarker, QgsTextAnnotationItem, QgsHtmlAnnotationItem, QgsFormAnnotationItem, and QgsSvgAnnotationItem.
Referenced by paint().
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protectedvirtual |
paint function called by map canvas
Reimplemented in QgsHtmlAnnotationItem, and QgsFormAnnotationItem.
Definition at line 40 of file qgsmapcanvasitem.cpp.
References QgsMapCanvas::antiAliasingEnabled(), mMapCanvas, and paint().
QgsRectangle QgsMapCanvasItem::rect | ( | ) | const |
returns canvas item rectangle
Definition at line 67 of file qgsmapcanvasitem.cpp.
References mRect.
Referenced by QgsHighlight::paint(), setRect(), and QgsRubberBand::updateRect().
void QgsMapCanvasItem::setPanningOffset | ( | const QPoint & | point | ) |
sets current offset, to be called from QgsMapCanvas
Definition at line 156 of file qgsmapcanvasitem.cpp.
References mPanningOffset.
Referenced by QgsMapCanvas::moveCanvasContents().
void QgsMapCanvasItem::setRect | ( | const QgsRectangle & | r | ) |
sets canvas item rectangle
Definition at line 73 of file qgsmapcanvasitem.cpp.
References QgsRectangle::isEmpty(), mItemSize, mRect, rect(), toCanvasCoordinates(), QgsRectangle::xMaximum(), QgsRectangle::xMinimum(), QgsRectangle::yMaximum(), and QgsRectangle::yMinimum().
Referenced by updatePosition(), QgsHighlight::updateRect(), and QgsRubberBand::updateRect().
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protected |
Sets render context parameters.
p | painter for rendering |
context | out: configured context |
Definition at line 109 of file qgsmapcanvasitem.cpp.
References QgsMapCanvas::mapRenderer(), QgsMapRenderer::Millimeters, mMapCanvas, QgsMapRenderer::outputDpi(), QgsMapRenderer::outputUnits(), rasterScaleFactor, QgsMapCanvas::scale(), QgsRenderContext::setForceVectorOutput(), QgsRenderContext::setPainter(), QgsRenderContext::setRasterScaleFactor(), QgsRenderContext::setRendererScale(), and QgsRenderContext::setScaleFactor().
Referenced by QgsAnnotationItem::drawMarkerSymbol().
QPointF QgsMapCanvasItem::toCanvasCoordinates | ( | const QgsPoint & | point | ) |
transformation from map coordinates to screen coordinates
Definition at line 59 of file qgsmapcanvasitem.cpp.
References QgsMapCanvas::getCoordinateTransform(), mMapCanvas, mPanningOffset, QgsMapToPixel::transformInPlace(), QgsPoint::x(), and QgsPoint::y().
Referenced by QgsHighlight::paint(), QgsRubberBand::paint(), QgsHighlight::paintLine(), QgsHighlight::paintPoint(), QgsHighlight::paintPolygon(), QgsVertexMarker::setCenter(), QgsAnnotationItem::setMapPosition(), setRect(), and QgsAnnotationItem::updatePosition().
QgsPoint QgsMapCanvasItem::toMapCoordinates | ( | const QPoint & | point | ) |
transformation from screen coordinates to map coordinates
Definition at line 53 of file qgsmapcanvasitem.cpp.
References QgsMapCanvas::getCoordinateTransform(), mMapCanvas, mPanningOffset, and QgsMapToPixel::toMapCoordinates().
Referenced by QgsAnnotationItem::setMapPositionFixed(), and QgsAnnotationItem::updatePosition().
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protected |
schedules map canvas for repaint
Definition at line 102 of file qgsmapcanvasitem.cpp.
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virtual |
called on changed extent or resize event to update position of the item
Reimplemented in QgsVertexMarker, and QgsAnnotationItem.
Definition at line 149 of file qgsmapcanvasitem.cpp.
References mRect, and setRect().
Referenced by QgsMapCanvas::updateCanvasItemPositions().
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protected |
cached size of the item (to return in boundingRect())
Definition at line 93 of file qgsmapcanvasitem.h.
Referenced by boundingRect(), and setRect().
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pointer to map canvas
Definition at line 83 of file qgsmapcanvasitem.h.
Referenced by QgsRubberBand::addGeometry(), QgsHighlight::init(), QgsHtmlAnnotationItem::javascript(), paint(), QgsHighlight::paint(), QgsHighlight::paintPoint(), QgsFormAnnotationItem::QgsFormAnnotationItem(), QgsHtmlAnnotationItem::QgsHtmlAnnotationItem(), QgsHtmlAnnotationItem::readXML(), QgsFormAnnotationItem::readXML(), QgsAnnotationItem::scaledSymbolSize(), QgsFormAnnotationItem::setFeatureForMapPosition(), QgsHtmlAnnotationItem::setFeatureForMapPosition(), setRenderContextVariables(), QgsRubberBand::setToCanvasRectangle(), toCanvasCoordinates(), toMapCoordinates(), QgsHighlight::updateRect(), QgsRubberBand::updateRect(), QgsFormAnnotationItem::updateVisibility(), and QgsHtmlAnnotationItem::updateVisibility().
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protected |
offset from normal position due current panning operation, used when converting map coordinates to move map canvas items
Definition at line 90 of file qgsmapcanvasitem.h.
Referenced by setPanningOffset(), toCanvasCoordinates(), and toMapCoordinates().
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protected |
canvas item rectangle (in map coordinates)
Definition at line 86 of file qgsmapcanvasitem.h.
Referenced by rect(), setRect(), and updatePosition().