QgsMapToPixel Class Reference

Perform transforms between map coordinates and device coordinates. More...

#include <qgsmaptopixel.h>

List of all members.

Public Member Functions
	QgsMapToPixel (double mapUnitsPerPixel=0, double ymax=0, double ymin=0, double xmin=0)
	~QgsMapToPixel ()
	destructor
double	mapUnitsPerPixel () const
	Return current map units per pixel.
void	setMapUnitsPerPixel (double mapUnitsPerPixel)
void	setParameters (double mapUnitsPerPixel, double xmin, double ymin, double ymax)
void	setXMinimum (double xmin)
	set minimum x value
void	setYMaximum (double ymax)
	Set maximum y value.
void	setYMinimum (double ymin)
	Set minimum y value.
QString	showParameters ()
	String representation of the parameters used in the transform.
QgsPoint	toMapCoordinates (int x, int y) const
QgsPoint	toMapCoordinates (QPoint p) const
QgsPoint	toMapCoordinatesF (double x, double y) const
QgsPoint	toMapPoint (double x, double y) const
QgsPoint	transform (const QgsPoint &p) const
void	transform (QgsPoint *p) const
QgsPoint	transform (double x, double y) const
void	transformInPlace (double &x, double &y) const
void	transformInPlace (QVector< double > &x, QVector< double > &y) const
Private Attributes
double	mMapUnitsPerPixel
double	xMax
double	xMin
double	yMax
double	yMin

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Detailed Description

Perform transforms between map coordinates and device coordinates.

This class can convert device coordinates to map coordinates and vice versa.

Definition at line 33 of file qgsmaptopixel.h.

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Constructor & Destructor Documentation

QgsMapToPixel::QgsMapToPixel	(	double	mapUnitsPerPixel = 0,
		double	ymax = 0,
		double	ymin = 0,
		double	xmin = 0
	)

Definition at line 25 of file qgsmaptopixel.cpp.

QgsMapToPixel::~QgsMapToPixel

(

)

destructor

Definition at line 37 of file qgsmaptopixel.cpp.

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Member Function Documentation

double QgsMapToPixel::mapUnitsPerPixel

(

)

const

Return current map units per pixel.

Definition at line 69 of file qgsmaptopixel.cpp.

References mMapUnitsPerPixel.

Referenced by QgsPointPatternFillSymbolLayer::applyPattern(), QgsPalLayerSettings::checkMinimumSizeMM(), QgsDiagramRendererV2::convertSizeToMapUnits(), QgsRasterLayer::draw(), QgsPalLabeling::drawLabelBackground(), QgsSymbolLayerV2Utils::lineWidthScaleFactor(), QgsSymbolLayerV2Utils::pixelSizeScaleFactor(), QgsPalLayerSettings::registerFeature(), QgsMapRenderer::render(), QgsDiagram::scaledFont(), QgsPalLayerSettings::scaleToPixelContext(), setMapUnitsPerPixel(), setParameters(), QgsDiagram::setPenWidth(), and QgsDiagram::sizePainterUnits().

void QgsMapToPixel::setMapUnitsPerPixel

(

double

mapUnitsPerPixel

)

Set map units per pixel

Parameters:

mapUnitsPerPixel

Map units per pixel

Definition at line 64 of file qgsmaptopixel.cpp.

References mapUnitsPerPixel(), and mMapUnitsPerPixel.

Referenced by QgsMapRenderer::render().

void QgsMapToPixel::setParameters	(	double	mapUnitsPerPixel,
		double	xmin,
		double	ymin,
		double	ymax
	)

Set parameters for use in tranfsorming coordinates

Parameters:

mapUnitsPerPixel	Map units per pixel
xmin	Minimum x value
ymin	Minimum y value
ymax	Maximum y value

Definition at line 89 of file qgsmaptopixel.cpp.

References mapUnitsPerPixel(), mMapUnitsPerPixel, xMin, yMax, and yMin.

Referenced by QgsMapRenderer::adjustExtentToSize().

void QgsMapToPixel::setXMinimum

(

double

xmin

)

set minimum x value

Definition at line 84 of file qgsmaptopixel.cpp.

References xMin.

void QgsMapToPixel::setYMaximum

(

double

ymax

)

Set maximum y value.

Definition at line 74 of file qgsmaptopixel.cpp.

References yMax.

Referenced by QgsMapRenderer::render().

void QgsMapToPixel::setYMinimum

(

double

ymin

)

Set minimum y value.

Definition at line 79 of file qgsmaptopixel.cpp.

References yMin.

QString QgsMapToPixel::showParameters

(

)

String representation of the parameters used in the transform.

Definition at line 98 of file qgsmaptopixel.cpp.

References mMapUnitsPerPixel, xMin, yMax, and yMin.

QgsPoint QgsMapToPixel::toMapCoordinates	(	int	x,
		int	y
	)		const

Definition at line 54 of file qgsmaptopixel.cpp.

References toMapPoint().

Referenced by QgsMapToolZoom::canvasReleaseEvent(), QgsMapToolIdentify::identify(), QgsPalGeometry::info(), QgsMapCanvas::mouseMoveEvent(), QgsMapOverviewCanvas::mouseReleaseEvent(), QgsMapCanvas::panActionEnd(), QgsPalLabeling::prepareLayer(), QgsRubberBand::setToCanvasRectangle(), QgsSnapper::snapPoint(), QgsTolerance::toLayerCoordinates(), QgsMapCanvasItem::toMapCoordinates(), and QgsMapTool::toMapCoordinates().

QgsPoint QgsMapToPixel::toMapCoordinates

(

QPoint

p

)

const

Tranform device coordinates to map (world) coordinates

Parameters:

p	Point to be converted to map cooordinates

Returns:

QgsPoint in map coorndiates

Definition at line 48 of file qgsmaptopixel.cpp.

References toMapPoint().

QgsPoint QgsMapToPixel::toMapCoordinatesF	(	double	x,
		double	y
	)		const

Transform device coordinates to map (world) coordinates

Note:

: this method was added in version 1.6

Definition at line 59 of file qgsmaptopixel.cpp.

References toMapPoint().

Referenced by QgsPalLayerSettings::calculateLabelSize(), QgsRasterLayer::draw(), and QgsPalGeometry::info().

QgsPoint QgsMapToPixel::toMapPoint	(	double	x,
		double	y
	)		const

Definition at line 41 of file qgsmaptopixel.cpp.

References mMapUnitsPerPixel, xMin, yMax, and yMin.

Referenced by QgsMapToolPan::canvasReleaseEvent(), QgsMapToolTouch::canvasReleaseEvent(), QgsMapToolTouch::pinchTriggered(), toMapCoordinates(), toMapCoordinatesF(), and QgsMapCanvas::zoomWithCenter().

QgsPoint QgsMapToPixel::transform

(

const QgsPoint &

p

)

const

Transform the point from map (world) coordinates to device coordinates

Parameters:

p	Point to transform

Returns:

QgsPoint in device coordinates

Definition at line 114 of file qgsmaptopixel.cpp.

References transformInPlace(), QgsPoint::x(), and QgsPoint::y().

Referenced by QgsRasterLayer::draw(), QgsMapOverviewCanvas::drawExtentRect(), QgsPalLabeling::drawLabel(), QgsPalLabeling::drawLabelCandidateRect(), QgsPalLabeling::drawLabeling(), and QgsLabel::renderLabel().

void QgsMapToPixel::transform

(

QgsPoint *

p

)

const

Definition at line 124 of file qgsmaptopixel.cpp.

References QgsPoint::set(), transformInPlace(), QgsPoint::x(), and QgsPoint::y().

QgsPoint QgsMapToPixel::transform	(	double	x,
		double	y
	)		const

Transform the point specified by x,y from map (world) coordinates to device coordinates

Parameters:

x	x cordinate o point to transform
y	y coordinate of point to transform

Returns:

QgsPoint in device coordinates

Definition at line 108 of file qgsmaptopixel.cpp.

References transformInPlace().

void QgsMapToPixel::transformInPlace	(	double &	x,
		double &	y
	)		const

Tranform device coordinates to map (world) coordinates

Parameters:

x	x coordinate of point to be converted to map cooordinates
y	y coordinate of point to be converted to map cooordinates

Returns:

QgsPoint in map coordinates

Definition at line 136 of file qgsmaptopixel.cpp.

References mMapUnitsPerPixel, xMin, yMax, and yMin.

Referenced by QgsFeatureRendererV2::_getLineString(), QgsFeatureRendererV2::_getPoint(), QgsFeatureRendererV2::_getPolygon(), QgsMapCanvasItem::toCanvasCoordinates(), QgsMapTool::toCanvasCoordinates(), transform(), and transformInPlace().

void QgsMapToPixel::transformInPlace	(	QVector< double > &	x,
		QVector< double > &	y
	)		const

Definition at line 142 of file qgsmaptopixel.cpp.

References transformInPlace().

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Member Data Documentation

double QgsMapToPixel::mMapUnitsPerPixel [private]

Definition at line 120 of file qgsmaptopixel.h.

Referenced by mapUnitsPerPixel(), setMapUnitsPerPixel(), setParameters(), showParameters(), toMapPoint(), and transformInPlace().

double QgsMapToPixel::xMax [private]

Definition at line 124 of file qgsmaptopixel.h.

double QgsMapToPixel::xMin [private]

Definition at line 123 of file qgsmaptopixel.h.

Referenced by setParameters(), setXMinimum(), showParameters(), toMapPoint(), and transformInPlace().

double QgsMapToPixel::yMax [private]

Definition at line 121 of file qgsmaptopixel.h.

Referenced by setParameters(), setYMaximum(), showParameters(), toMapPoint(), and transformInPlace().

double QgsMapToPixel::yMin [private]

Definition at line 122 of file qgsmaptopixel.h.

Referenced by setParameters(), setYMinimum(), showParameters(), toMapPoint(), and transformInPlace().

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

• src/core/qgsmaptopixel.h
• src/core/qgsmaptopixel.cpp