QgsMapToPixel Class Reference
[QGIS core library]

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

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 (std::vector< double > &x, std::vector< double > &y) const

QgsPoint toMapCoordinates (int x, int y) const

QgsPoint toMapCoordinatesF (double x, double y) const

QgsPoint toMapCoordinates (QPoint p) const

QgsPoint toMapPoint (double x, double y) const

void setMapUnitsPerPixel (double mapUnitsPerPixel)

double mapUnitsPerPixel () const

Return current map units per pixel.

void setYMaximum (double ymax)

Set maximum y value.

void setYMinimum (double ymin)

Set minimum y value.

void setXMinimum (double xmin)

set minimum x value

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

QString showParameters ()

String representation of the parameters used in the transform.

Private Attributes

double mMapUnitsPerPixel

double yMax

double yMin

double xMin

double xMax

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 34 of file qgsmaptopixel.h.

Constructor & Destructor Documentation

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

Definition at line 23 of file qgsmaptopixel.cpp.

QgsMapToPixel::~QgsMapToPixel ( )

destructor

Definition at line 35 of file qgsmaptopixel.cpp.

Member Function Documentation

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 112 of file qgsmaptopixel.cpp.

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

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

void QgsMapToPixel::transform ( QgsPoint * p ) const

Definition at line 122 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 106 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 134 of file qgsmaptopixel.cpp.

References mMapUnitsPerPixel, xMin, yMax, and yMin.

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

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

Definition at line 140 of file qgsmaptopixel.cpp.

References transformInPlace().

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

Definition at line 52 of file qgsmaptopixel.cpp.

References toMapPoint().

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

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 57 of file qgsmaptopixel.cpp.

References toMapPoint().

Referenced by QgsPalGeometry::info().

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 46 of file qgsmaptopixel.cpp.

References toMapPoint().

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

Definition at line 39 of file qgsmaptopixel.cpp.

References mMapUnitsPerPixel, xMin, yMax, and yMin.

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

void QgsMapToPixel::setMapUnitsPerPixel ( double mapUnitsPerPixel )

Set map units per pixel

Parameters:

mapUnitsPerPixel

Map units per pixel

Definition at line 62 of file qgsmaptopixel.cpp.

References mMapUnitsPerPixel.

Referenced by QgsMapRenderer::render().

double QgsMapToPixel::mapUnitsPerPixel ( ) const

Return current map units per pixel.

Definition at line 67 of file qgsmaptopixel.cpp.

References mMapUnitsPerPixel.

Referenced by QgsPalLayerSettings::checkMinimumSizeMM(), QgsRasterImageBuffer::createNextPartImage(), QgsRasterLayer::draw(), QgsRasterImageBuffer::drawPixelRectangle(), QgsSymbolLayerV2Utils::lineWidthScaleFactor(), QgsRasterLayer::paintImageToCanvas(), QgsSymbolLayerV2Utils::pixelSizeScaleFactor(), QgsMapRenderer::render(), QgsUniqueValueRenderer::renderFeature(), QgsSingleSymbolRenderer::renderFeature(), QgsGraduatedSymbolRenderer::renderFeature(), and QgsPalLayerSettings::sizeToPixel().

void QgsMapToPixel::setYMaximum ( double ymax )

Set maximum y value.

Definition at line 72 of file qgsmaptopixel.cpp.

References yMax.

Referenced by QgsMapRenderer::render().

void QgsMapToPixel::setYMinimum ( double ymin )

Set minimum y value.

Definition at line 77 of file qgsmaptopixel.cpp.

References yMin.

void QgsMapToPixel::setXMinimum ( double xmin )

set minimum x value

Definition at line 82 of file qgsmaptopixel.cpp.

References xMin.

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 87 of file qgsmaptopixel.cpp.

References mMapUnitsPerPixel, xMin, yMax, and yMin.

Referenced by QgsMapRenderer::adjustExtentToSize().

QString QgsMapToPixel::showParameters ( )

String representation of the parameters used in the transform.

Definition at line 96 of file qgsmaptopixel.cpp.

References mMapUnitsPerPixel, xMin, yMax, and yMin.

Member Data Documentation

double QgsMapToPixel::mMapUnitsPerPixel [private]

Definition at line 115 of file qgsmaptopixel.h.

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

double QgsMapToPixel::yMax [private]

Definition at line 116 of file qgsmaptopixel.h.

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

double QgsMapToPixel::yMin [private]

Definition at line 117 of file qgsmaptopixel.h.

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

double QgsMapToPixel::xMin [private]

Definition at line 118 of file qgsmaptopixel.h.

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

double QgsMapToPixel::xMax [private]

Definition at line 119 of file qgsmaptopixel.h.

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

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


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

QgsMapToPixel Class Reference [QGIS core library]

Public Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation

QgsMapToPixel Class Reference
[QGIS core library]