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git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@9178 c8812cc2-4d05-0410-92ff-de0c093fc19c
90 lines
3.0 KiB
Plaintext
90 lines
3.0 KiB
Plaintext
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/*! \class QgsMapToPixel
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* \brief Class for doing transforms between map coordinates and device coordinates.
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*
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* This class can convert device coordinates to map coordinates and vice versa.
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*/
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class QgsMapToPixel
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{
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%TypeHeaderCode
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#include <qgsmaptopixel.h>
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%End
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public:
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/* Constructor
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* @param mapUnitsPerPixel Map units per pixel
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* @param ymax Maximum y value of the map canvas
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* @param ymin Minimum y value of the map canvas
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* @param xmin Minimum x value of the map canvas
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*/
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QgsMapToPixel(double mapUnitsPerPixel=0, double ymax = 0, double ymin=0,
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double xmin = 0);
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//! destructor
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~QgsMapToPixel();
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/*! Transform the point from map (world) coordinates to device coordinates
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* @param p Point to transform
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* @return QgsPoint in device coordinates
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*/
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QgsPoint transform(const QgsPoint& p);
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void transform(QgsPoint* p);
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/*! Transform the point specified by x,y from map (world)
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* coordinates to device coordinates
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* @param x x cordinate o point to transform
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* @param y y coordinate of point to transform
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* @return QgsPoint in device coordinates
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*/
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QgsPoint transform(double x, double y);
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/*! Tranform device coordinates to map (world) coordinates
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* @param x x coordinate of point to be converted to map cooordinates
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* @param y y coordinate of point to be converted to map cooordinates
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* @return QgsPoint in map coordinates
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*/
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/* Transform device coordinates to map coordinates. Modifies the
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given coordinates in place. Intended as a fast way to do the
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transform. */
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void transformInPlace(double& x, double& y);
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/* Transform device coordinates to map coordinates. Modifies the
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given coordinates in place. Intended as a fast way to do the
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transform. */
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// TODO: not supported argument, must solve manually
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//void transformInPlace(std::vector<double>& x,
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// std::vector<double>& y);
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QgsPoint toMapCoordinates(int x, int y);
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/*! Tranform device coordinates to map (world) coordinates
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* @param p Point to be converted to map cooordinates
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* @return QgsPoint in map coorndiates
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*/
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QgsPoint toMapCoordinates(QPoint p);
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QgsPoint toMapPoint(int x, int y);
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/*! Set map units per pixel
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* @param mapUnitsPerPixel Map units per pixel
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*/
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void setMapUnitsPerPixel(double mapUnitsPerPixel);
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//! Return current map units per pixel
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double mapUnitsPerPixel();
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//! Set maximum y value
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void setYMaximum(double ymax);
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//! Set minimum y value
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void setYMinimum(double ymin);
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//! set minimum x value
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void setXMinimum(double xmin);
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/*! Set parameters for use in tranfsorming coordinates
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* @param mapUnitsPerPixel Map units per pixel
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* @param xmin Minimum x value
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* @param ymin Minimum y value
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* @param ymax Maximum y value
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*/
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void setParameters(double mapUnitsPerPixel, double xmin, double ymin, double ymax);
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//! String representation of the parameters used in the transform
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QString showParameters();
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};
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