QGIS API Documentation  2.99.0-Master (08c2e66)
qgsmapunitscale.h
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1 /***************************************************************************
2  qgsmapunitscale.h
3  Struct for storing maximum and minimum scales for measurements in map units
4  -------------------
5  begin : April 2014
6  copyright : (C) Sandro Mani
7  email : smani at sourcepole dot ch
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 #ifndef QGSMAPUNITSCALE_H
19 #define QGSMAPUNITSCALE_H
20 
21 #include "qgis_core.h"
22 #include "qgis.h"
23 #include <QtCore>
24 
25 class QgsRenderContext;
26 
36 class CORE_EXPORT QgsMapUnitScale
37 {
38  public:
39 
44  explicit QgsMapUnitScale( double minScale = 0.0, double maxScale = 0.0 )
45  : minScale( minScale )
46  , maxScale( maxScale )
47  , minSizeMMEnabled( false )
48  , minSizeMM( 0.0 )
49  , maxSizeMMEnabled( false )
50  , maxSizeMM( 0.0 )
51  {}
52 
54  double minScale;
56  double maxScale;
57 
61  double minSizeMM;
65  double maxSizeMM;
66 
72  double computeMapUnitsPerPixel( const QgsRenderContext& c ) const;
73 
74  bool operator==( const QgsMapUnitScale& other ) const
75  {
76  return qgsDoubleNear( minScale, other.minScale )
77  && qgsDoubleNear( maxScale, other.maxScale )
78  && minSizeMMEnabled == other.minSizeMMEnabled
79  && qgsDoubleNear( minSizeMM, other.minSizeMM )
80  && maxSizeMMEnabled == other.maxSizeMMEnabled
81  && qgsDoubleNear( maxSizeMM, other.maxSizeMM );
82  }
83 
84  bool operator!=( const QgsMapUnitScale& other ) const
85  {
86  return !operator==( other );
87  }
88 };
89 
90 
91 #endif // QGSMAPUNITSCALE_H
92 
93 
94 
double minSizeMM
The minimum size in millimeters, or 0.0 if unset.
bool operator==(const QgsMapUnitScale &other) const
bool operator==(const QgsFeatureIterator &fi1, const QgsFeatureIterator &fi2)
bool qgsDoubleNear(double a, double b, double epsilon=4 *DBL_EPSILON)
Compare two doubles (but allow some difference)
Definition: qgis.h:198
double maxScale
The maximum scale, or 0.0 if unset.
bool minSizeMMEnabled
Whether the minimum size in mm should be respected.
Contains information about the context of a rendering operation.
QgsMapUnitScale(double minScale=0.0, double maxScale=0.0)
Constructor for QgsMapUnitScale.
double maxSizeMM
The maximum size in millimeters, or 0.0 if unset.
Struct for storing maximum and minimum scales for measurements in map units.
bool operator!=(const QgsMapUnitScale &other) const
double minScale
The minimum scale, or 0.0 if unset.
bool maxSizeMMEnabled
Whether the maximum size in mm should be respected.