/usr/include/qgis/qgsrasterprojector.h is in libqgis-dev 1.7.4+1.7.5~20120320-1.1+b1.
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qgsrasterprojector.h - Raster projector
--------------------------------------
Date : Jan 16, 2011
Copyright : (C) 2005 by Radim Blazek
email : radim dot blazek at gmail dot com
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
/* $Id: qgsrasterprojector.h 15005 2011-01-08 16:35:21Z rblazek $ */
/* This code takes ideas from WarpBuilder in Geotools.
* Thank you to Ing. Andrea Aime, Ing. Simone Giannecchini and GeoSolutions S.A.S.
* See : http://geo-solutions.blogspot.com/2011/01/developers-corner-improving.html
*/
#ifndef QGSRASTERPROJECTOR_H
#define QGSRASTERPROJECTOR_H
#include <QVector>
#include <QList>
#include "qgsrectangle.h"
#include "qgscoordinatereferencesystem.h"
#include "qgscoordinatetransform.h"
#include <cmath>
//class QgsRectangle;
class QgsPoint;
//class CORE_EXPORT QgsRasterProjector
class QgsRasterProjector
{
// Q_OBJECT
public:
/** \brief QgsRasterProjector implements approximate projection support for
* it calculates grid of points in source CRS for target CRS + extent
* which are used to calculate affine transformation matrices.
* */
QgsRasterProjector(
QgsCoordinateReferenceSystem theSrcCRS,
QgsCoordinateReferenceSystem theDestCRS,
QgsRectangle theDestExtent,
int theDestRows, int theDestCols,
double theMaxSrcXRes, double theMaxSrcYRes,
QgsRectangle theExtent
);
/** \brief The destructor */
~QgsRasterProjector();
/** \brief get destination point for _current_ destination position */
void destPointOnCPMatrix( int theRow, int theCol, double *theX, double *theY );
/** \brief Get matrix upper left row/col indexes for destination row/col */
int matrixRow( int theDestRow );
int matrixCol( int theDestCol );
/** \brief get destination point for _current_ matrix position */
QgsPoint srcPoint( int theRow, int theCol );
/** \brief Get precise source row and column indexes for current source extent and resolution */
inline void preciseSrcRowCol( int theDestRow, int theDestCol, int *theSrcRow, int *theSrcCol );
/** \brief Get approximate source row and column indexes for current source extent and resolution */
inline void approximateSrcRowCol( int theDestRow, int theDestCol, int *theSrcRow, int *theSrcCol );
/** \brief Get source row and column indexes for current source extent and resolution */
void srcRowCol( int theDestRow, int theDestCol, int *theSrcRow, int *theSrcCol );
/** \brief insert rows to matrix */
void insertRows();
/** \brief insert columns to matrix */
void insertCols();
/* calculate single control point in current matrix */
void calcCP( int theRow, int theCol );
/** \brief calculate matrix row */
bool calcRow( int theRow );
/** \brief calculate matrix column */
bool calcCol( int theCol );
/** \brief calculate source extent */
void calcSrcExtent();
/** \brief calculate minimum source width and height */
void calcSrcRowsCols();
/** \brief check error along columns
* returns true if within threshold */
bool checkCols();
/** \brief check error along rows
* returns true if within threshold */
bool checkRows();
/** Calculate array of src helper points */
//void calcHelper ( int theMatrixRow, QList<QgsPoint> *thePoints );
void calcHelper( int theMatrixRow, QgsPoint *thePoints );
/** Calc / switch helper */
void nextHelper();
/** get source extent */
QgsRectangle srcExtent() { return mSrcExtent; }
/** get/set source width/height */
int srcRows() { return mSrcRows; }
int srcCols() { return mSrcCols; }
void setSrcRows( int theRows ) { mSrcRows = theRows; mSrcXRes = mSrcExtent.height() / mSrcRows; }
void setSrcCols( int theCols ) { mSrcCols = theCols; mSrcYRes = mSrcExtent.width() / mSrcCols; }
/** get mCPMatrix as string */
QString cpToString();
private:
/** Source CRS */
QgsCoordinateReferenceSystem mSrcCRS;
/** Destination CRS */
QgsCoordinateReferenceSystem mDestCRS;
/** Coordinate transform */
QgsCoordinateTransform mCoordinateTransform;
/** Destination extent */
QgsRectangle mDestExtent;
/** Source extent */
QgsRectangle mSrcExtent;
/** Source raster extent */
QgsRectangle mExtent;
/** Number of destination rows */
int mDestRows;
/** Number of destination columns */
int mDestCols;
/** Destination x resolution */
double mDestXRes;
/** Destination y resolution */
double mDestYRes;
/** Number of source rows */
int mSrcRows;
/** Number of source columns */
int mSrcCols;
/** Source x resolution */
double mSrcXRes;
/** Source y resolution */
double mSrcYRes;
/** number of destination rows per matrix row */
double mDestRowsPerMatrixRow;
/** number of destination cols per matrix col */
double mDestColsPerMatrixCol;
/** Grid of source control points */
QList< QList<QgsPoint> > mCPMatrix;
/** Array of source points for each destination column on top of current CPMatrix grid row */
/* Warning: using QList is slow on access */
QgsPoint *pHelperTop;
/** Array of source points for each destination column on bottom of current CPMatrix grid row */
/* Warning: using QList is slow on access */
QgsPoint *pHelperBottom;
/** Current mHelperTop matrix row */
int mHelperTopRow;
/** Number of mCPMatrix columns */
int mCPCols;
/** Number of mCPMatrix rows */
int mCPRows;
/** Maximum tolerance in destination units */
double mSqrTolerance;
/** Maximum source resolution */
double mMaxSrcXRes;
double mMaxSrcYRes;
/** Use approximation */
bool mApproximate;
};
#endif
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