QGIS API Documentation
qgsrasterprojector.h
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1 /***************************************************************************
2  qgsrasterprojector.h - Raster projector
3  --------------------------------------
4  Date : Jan 16, 2011
5  Copyright : (C) 2005 by Radim Blazek
6  email : radim dot blazek at gmail dot com
7  ***************************************************************************/
8 
9 /***************************************************************************
10  * *
11  * This program is free software; you can redistribute it and/or modify *
12  * it under the terms of the GNU General Public License as published by *
13  * the Free Software Foundation; either version 2 of the License, or *
14  * (at your option) any later version. *
15  * *
16  ***************************************************************************/
17 
18 /* This code takes ideas from WarpBuilder in Geotools.
19  * Thank to Ing. Andrea Aime, Ing. Simone Giannecchini and GeoSolutions S.A.S.
20  * See : http://geo-solutions.blogspot.com/2011/01/developers-corner-improving.html
21  */
22 
23 #ifndef QGSRASTERPROJECTOR_H
24 #define QGSRASTERPROJECTOR_H
25 
26 #include <QVector>
27 #include <QList>
28 
29 #include "qgsrectangle.h"
31 #include "qgscoordinatetransform.h"
32 #include "qgsrasterinterface.h"
33 
34 #include <cmath>
35 
36 class QgsPoint;
37 
38 class CORE_EXPORT QgsRasterProjector : public QgsRasterInterface
39 {
40  public:
44  enum Precision
45  {
46  Approximate = 0,
47  Exact = 1,
48  };
49 
56  const QgsCoordinateReferenceSystem& theDestCRS,
57  int theSrcDatumTransform,
58  int theDestDatumTransform,
59  const QgsRectangle& theDestExtent,
60  int theDestRows, int theDestCols,
61  double theMaxSrcXRes, double theMaxSrcYRes,
62  const QgsRectangle& theExtent
63  );
64 
66  const QgsCoordinateReferenceSystem& theDestCRS,
67  const QgsRectangle& theDestExtent,
68  int theDestRows, int theDestCols,
69  double theMaxSrcXRes, double theMaxSrcYRes,
70  const QgsRectangle& theExtent
71  );
73  const QgsCoordinateReferenceSystem& theDestCRS,
74  double theMaxSrcXRes, double theMaxSrcYRes,
75  const QgsRectangle& theExtent
76  );
79  // To avoid synthesized which fails on copy of QgsCoordinateTransform
80  // (QObject child) in Python bindings
81  QgsRasterProjector( const QgsRasterProjector &projector );
82 
85 
86  QgsRasterProjector & operator=( const QgsRasterProjector &projector );
87 
88  QgsRasterProjector *clone() const override;
89 
90  int bandCount() const override;
91 
92  QGis::DataType dataType( int bandNo ) const override;
93 
95  void setCRS( const QgsCoordinateReferenceSystem & theSrcCRS, const QgsCoordinateReferenceSystem & theDestCRS,
96  int srcDatumTransform = -1, int destDatumTransform = -1 );
97 
99  QgsCoordinateReferenceSystem srcCrs() const { return mSrcCRS; }
100 
102  QgsCoordinateReferenceSystem destCrs() const { return mDestCRS; }
103 
105  void setMaxSrcRes( double theMaxSrcXRes, double theMaxSrcYRes )
106  {
107  mMaxSrcXRes = theMaxSrcXRes;
108  mMaxSrcYRes = theMaxSrcYRes;
109  }
110 
111  Precision precision() const { return mPrecision; }
112  void setPrecision( Precision precision ) { mPrecision = precision; }
113  // Translated precision mode, for use in ComboBox etc.
114  static QString precisionLabel( Precision precision );
115 
116  QgsRasterBlock *block( int bandNo, const QgsRectangle & extent, int width, int height ) override;
117 
119  bool destExtentSize( const QgsRectangle& theSrcExtent, int theSrcXSize, int theSrcYSize,
120  QgsRectangle& theDestExtent, int& theDestXSize, int& theDestYSize );
121 
123  static bool extentSize( const QgsCoordinateTransform* ct,
124  const QgsRectangle& theSrcExtent, int theSrcXSize, int theSrcYSize,
125  QgsRectangle& theDestExtent, int& theDestXSize, int& theDestYSize );
126 
127  private:
129  QgsRectangle srcExtent() { return mSrcExtent; }
130 
132  int srcRows() { return mSrcRows; }
133  int srcCols() { return mSrcCols; }
134  void setSrcRows( int theRows ) { mSrcRows = theRows; mSrcXRes = mSrcExtent.height() / mSrcRows; }
135  void setSrcCols( int theCols ) { mSrcCols = theCols; mSrcYRes = mSrcExtent.width() / mSrcCols; }
136 
141  bool srcRowCol( int theDestRow, int theDestCol, int *theSrcRow, int *theSrcCol, const QgsCoordinateTransform* ct );
142 
143  int dstRows() const { return mDestRows; }
144  int dstCols() const { return mDestCols; }
145 
147  void destPointOnCPMatrix( int theRow, int theCol, double *theX, double *theY );
148 
150  int matrixRow( int theDestRow );
151  int matrixCol( int theDestCol );
152 
154  QgsPoint srcPoint( int theRow, int theCol );
155 
157  inline bool preciseSrcRowCol( int theDestRow, int theDestCol, int *theSrcRow, int *theSrcCol, const QgsCoordinateTransform* ct );
158 
160  inline bool approximateSrcRowCol( int theDestRow, int theDestCol, int *theSrcRow, int *theSrcCol );
161 
163  void calc();
164 
166  void insertRows( const QgsCoordinateTransform* ct );
167 
169  void insertCols( const QgsCoordinateTransform* ct );
170 
172  void calcCP( int theRow, int theCol, const QgsCoordinateTransform* ct );
173 
175  bool calcRow( int theRow, const QgsCoordinateTransform* ct );
176 
178  bool calcCol( int theCol, const QgsCoordinateTransform* ct );
179 
181  void calcSrcExtent();
182 
184  void calcSrcRowsCols();
185 
188  bool checkCols( const QgsCoordinateTransform* ct );
189 
192  bool checkRows( const QgsCoordinateTransform* ct );
193 
195  void calcHelper( int theMatrixRow, QgsPoint *thePoints );
196 
198  void nextHelper();
199 
201  QString cpToString();
202 
205 
208 
210  int mSrcDatumTransform;
211 
213  int mDestDatumTransform;
214 
216  QgsRectangle mDestExtent;
217 
219  QgsRectangle mSrcExtent;
220 
222  QgsRectangle mExtent;
223 
225  int mDestRows;
226 
228  int mDestCols;
229 
231  double mDestXRes;
232 
234  double mDestYRes;
235 
237  int mSrcRows;
238 
240  int mSrcCols;
241 
243  double mSrcXRes;
244 
246  double mSrcYRes;
247 
249  double mDestRowsPerMatrixRow;
250 
252  double mDestColsPerMatrixCol;
253 
255  QList< QList<QgsPoint> > mCPMatrix;
256 
258  /* Same size as mCPMatrix */
259  QList< QList<bool> > mCPLegalMatrix;
260 
262  /* Warning: using QList is slow on access */
263  QgsPoint *pHelperTop;
264 
266  /* Warning: using QList is slow on access */
267  QgsPoint *pHelperBottom;
268 
270  int mHelperTopRow;
271 
273  int mCPCols;
275  int mCPRows;
276 
278  double mSqrTolerance;
279 
281  double mMaxSrcXRes;
282  double mMaxSrcYRes;
283 
285  Precision mPrecision;
286 
289  bool mApproximate;
290 };
291 
292 #endif
293 
virtual int bandCount() const =0
Get number of bands.
void setMaxSrcRes(double theMaxSrcXRes, double theMaxSrcYRes)
set maximum source resolution
A rectangle specified with double values.
Definition: qgsrectangle.h:35
Precision precision() const
Raster data container.
QgsCoordinateReferenceSystem destCrs() const
Get destination CRS.
virtual QGis::DataType dataType(int bandNo) const =0
Returns data type for the band specified by number.
Base class for processing filters like renderers, reprojector, resampler etc.
A class to represent a point.
Definition: qgspoint.h:117
void setPrecision(Precision precision)
QgsCoordinateReferenceSystem srcCrs() const
Get source CRS.
Precision
Precison defines if each pixel is reprojected or approximate reprojection based on an approximation m...
virtual QgsRasterInterface * clone() const =0
Clone itself, create deep copy.
Class for storing a coordinate reference system (CRS)
DataType
Raster data types.
Definition: qgis.h:129
virtual QgsRasterBlock * block(int bandNo, const QgsRectangle &extent, int width, int height)=0
Read block of data using given extent and size.
Class for doing transforms between two map coordinate systems.
double height() const
Height of the rectangle.
Definition: qgsrectangle.h:212