-
-
Notifications
You must be signed in to change notification settings - Fork 3k
/
qgsmaptopixel.h
223 lines (189 loc) · 6.98 KB
/
qgsmaptopixel.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
/***************************************************************************
qgsmaptopixel.h - description
-------------------
begin : Sat Jun 22 2002
copyright : (C) 2002 by Gary E.Sherman
email : sherman at mrcc.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. *
* *
***************************************************************************/
#ifndef QGSMAPTOPIXEL
#define QGSMAPTOPIXEL
#include "qgis_core.h"
#include "qgis_sip.h"
#include <QTransform>
#include <vector>
#include "qgsunittypes.h"
#include <cassert>
#include <memory>
class QgsPointXY;
class QPoint;
/**
* \ingroup core
* Perform transforms between map coordinates and device coordinates.
*
* This class can convert device coordinates to map coordinates and vice versa.
*/
class CORE_EXPORT QgsMapToPixel
{
public:
/**
* Constructor
* \param mapUnitsPerPixel Map units per pixel
* \param centerX X coordinate of map center, in geographical units
* \param centerY Y coordinate of map center, in geographical units
* \param widthPixels Output width, in pixels
* \param heightPixels Output height, in pixels
* \param rotation clockwise rotation in degrees
* \since QGIS 2.8
*/
QgsMapToPixel( double mapUnitsPerPixel, double centerX, double centerY, int widthPixels, int heightPixels, double rotation );
/**
* Constructor
* \param mapUnitsPerPixel Map units per pixel
*/
QgsMapToPixel( double mapUnitsPerPixel );
/**
* Returns a new QgsMapToPixel created using a specified \a scale and distance unit.
* \param scale map scale denominator, e.g. 1000.0 for a 1:1000 map.
* \param dpi screen DPI
* \param mapUnits map units
* \returns matching QgsMapToPixel
* \since QGIS 3.0
*/
static QgsMapToPixel fromScale( double scale, QgsUnitTypes::DistanceUnit mapUnits, double dpi = 96 );
/**
* Constructor
*
* Use setParameters to fill
*/
QgsMapToPixel();
/**
* Transform the point from map (world) coordinates to device coordinates
* \param p Point to transform
* \returns QgsPointXY in device coordinates
*/
QgsPointXY transform( const QgsPointXY &p ) const;
void transform( QgsPointXY *p ) const;
/**
* Transform the point specified by x,y from map (world)
* coordinates to device coordinates
* \param x x coordinate o point to transform
* \param y y coordinate of point to transform
* \returns QgsPointXY in device coordinates
*/
QgsPointXY transform( qreal x, qreal y ) const;
/**
* Transform device coordinates to map coordinates. Modifies the
* given coordinates in place. Intended as a fast way to do the
* transform.
*/
void transformInPlace( double &x, double &y ) const;
//! \note not available in Python bindings
void transformInPlace( float &x, float &y ) const SIP_SKIP;
#ifndef SIP_RUN
/**
* Transform device coordinates to map coordinates. Modifies the
* given coordinates in place. Intended as a fast way to do the
* transform.
* \note not available in Python bindings
*/
template <class T> SIP_SKIP
void transformInPlace( QVector<T> &x, QVector<T> &y ) const
{
assert( x.size() == y.size() );
for ( int i = 0; i < x.size(); ++i )
transformInPlace( x[i], y[i] );
}
#endif
//! Transform device coordinates to map (world) coordinates
QgsPointXY toMapCoordinates( int x, int y ) const;
//! Transform device coordinates to map (world) coordinates
QgsPointXY toMapCoordinates( double x, double y ) const SIP_PYNAME( toMapCoordinatesF );
/**
* Transform device coordinates to map (world) coordinates
* \param p Point to be converted to map cooordinates
* \returns QgsPointXY in map coorndiates
*/
QgsPointXY toMapCoordinates( QPoint p ) const;
/**
* Transform device coordinates to map (world) coordinates
* \deprecated since QGIS 3.4 use toMapCoordinates instead
*/
Q_DECL_DEPRECATED QgsPointXY toMapPoint( double x, double y ) const SIP_DEPRECATED;
/**
* Set map units per pixel
* \param mapUnitsPerPixel Map units per pixel
*/
void setMapUnitsPerPixel( double mapUnitsPerPixel );
//! Returns current map units per pixel
double mapUnitsPerPixel() const;
/**
* Returns current map width in pixels
* The information is only known if setRotation was used
* \since QGIS 2.8
*/
int mapWidth() const;
/**
* Returns current map height in pixels
* \since QGIS 2.8
*/
int mapHeight() const;
/**
* Set map rotation in degrees (clockwise)
* \param degrees clockwise rotation in degrees
* \param cx X ordinate of map center in geographical units
* \param cy Y ordinate of map center in geographical units
* \since QGIS 2.8
*/
void setMapRotation( double degrees, double cx, double cy );
/**
* Returns current map rotation in degrees (clockwise)
* \since QGIS 2.8
*/
double mapRotation() const;
/**
* Set parameters for use in transforming coordinates
* \param mapUnitsPerPixel Map units per pixel
* \param centerX X coordinate of map center, in geographical units
* \param centerY Y coordinate of map center, in geographical units
* \param widthPixels Output width, in pixels
* \param heightPixels Output height, in pixels
* \param rotation clockwise rotation in degrees
* \since QGIS 2.8
*/
void setParameters( double mapUnitsPerPixel, double centerX, double centerY, int widthPixels, int heightPixels, double rotation );
//! String representation of the parameters used in the transform
QString showParameters() const;
QTransform transform() const;
/**
* Returns the center x-coordinate for the transform.
* \see yCenter()
* \since QGIS 3.0
*/
double xCenter() const { return mXCenter; }
/**
* Returns the center y-coordinate for the transform.
* \see xCenter()
* \since QGIS 3.0
*/
double yCenter() const { return mYCenter; }
private:
double mMapUnitsPerPixel = 1;
int mWidth = 1;
int mHeight = 1;
double mRotation = 0.0;
double mXCenter = 0.5;
double mYCenter = 0.5;
double xMin = 0;
double yMin = 0;
QTransform mMatrix;
bool updateMatrix();
};
#endif // QGSMAPTOPIXEL