QGIS API Documentation 3.27.0-Master (1d7a28cfd2)
qgsdemterraingenerator.cpp
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1/***************************************************************************
2 qgsdemterraingenerator.cpp
3 --------------------------------------
4 Date : July 2017
5 Copyright : (C) 2017 by Martin Dobias
6 Email : wonder dot sk at gmail dot com
7 ***************************************************************************
8 * *
9 * This program is free software; you can redistribute it and/or modify *
10 * it under the terms of the GNU General Public License as published by *
11 * the Free Software Foundation; either version 2 of the License, or *
12 * (at your option) any later version. *
13 * *
14 ***************************************************************************/
15
17
19
20#include "qgsrasterlayer.h"
22
24{
25 delete mHeightMapGenerator;
26}
27
29{
30 mLayer = QgsMapLayerRef( layer );
31 updateGenerator();
32}
33
35{
36 return qobject_cast<QgsRasterLayer *>( mLayer.layer.data() );
37}
38
40{
41 mCrs = crs;
42 mTransformContext = context;
43 updateGenerator();
44}
45
47{
49 cloned->setTerrain( mTerrain );
50 cloned->mCrs = mCrs;
51 cloned->mLayer = mLayer;
52 cloned->mResolution = mResolution;
53 cloned->mSkirtHeight = mSkirtHeight;
54 cloned->updateGenerator();
55 return cloned;
56}
57
59{
61}
62
64{
65 return mTerrainTilingScheme.tileToExtent( 0, 0, 0 );
66}
67
68float QgsDemTerrainGenerator::heightAt( double x, double y, const Qgs3DMapSettings &map ) const
69{
70 Q_UNUSED( map )
71 if ( mHeightMapGenerator )
72 return mHeightMapGenerator->heightAt( x, y );
73 else
74 return 0;
75}
76
77void QgsDemTerrainGenerator::writeXml( QDomElement &elem ) const
78{
79 elem.setAttribute( QStringLiteral( "layer" ), mLayer.layerId );
80 elem.setAttribute( QStringLiteral( "resolution" ), mResolution );
81 elem.setAttribute( QStringLiteral( "skirt-height" ), mSkirtHeight );
82
83 // crs is not read/written - it should be the same as destination crs of the map
84}
85
86void QgsDemTerrainGenerator::readXml( const QDomElement &elem )
87{
88 mLayer = QgsMapLayerRef( elem.attribute( QStringLiteral( "layer" ) ) );
89 mResolution = elem.attribute( QStringLiteral( "resolution" ) ).toInt();
90 mSkirtHeight = elem.attribute( QStringLiteral( "skirt-height" ) ).toFloat();
91
92 // crs is not read/written - it should be the same as destination crs of the map
93}
94
96{
97 mLayer = QgsMapLayerRef( project.mapLayer( mLayer.layerId ) );
98 updateGenerator();
99}
100
101QgsChunkLoader *QgsDemTerrainGenerator::createChunkLoader( QgsChunkNode *node ) const
102{
103 // A bit of a hack to make cloning terrain generator work properly
104 return new QgsDemTerrainTileLoader( mTerrain, node, const_cast<QgsDemTerrainGenerator *>( this ) );
105}
106
107void QgsDemTerrainGenerator::updateGenerator()
108{
109 QgsRasterLayer *dem = layer();
110 if ( dem )
111 {
112 QgsRectangle te = dem->extent();
113 QgsCoordinateTransform terrainToMapTransform( dem->crs(), mCrs, mTransformContext );
114 terrainToMapTransform.setBallparkTransformsAreAppropriate( true );
115 te = terrainToMapTransform.transformBoundingBox( te );
116
118 delete mHeightMapGenerator;
119 mHeightMapGenerator = new QgsDemHeightMapGenerator( dem, mTerrainTilingScheme, mResolution, mTransformContext );
120 mIsValid = true;
121 }
122 else
123 {
125 delete mHeightMapGenerator;
126 mHeightMapGenerator = nullptr;
127 mIsValid = false;
128 }
129}
This class represents a coordinate reference system (CRS).
Contains information about the context in which a coordinate transform is executed.
Class for doing transforms between two map coordinate systems.
float heightAt(double x, double y, const Qgs3DMapSettings &map) const override
Returns height at (x,y) in terrain's CRS.
Type type() const override
What texture generator implementation is this.
void setCrs(const QgsCoordinateReferenceSystem &crs, const QgsCoordinateTransformContext &context)
Sets CRS of the terrain.
void readXml(const QDomElement &elem) override
Read terrain generator's configuration from XML.
QgsTerrainGenerator * clone() const override
Makes a copy of the current instance.
QgsRectangle extent() const override
extent of the terrain in terrain's CRS
void resolveReferences(const QgsProject &project) override
After read of XML, resolve references to any layers that have been read as layer IDs.
QgsRasterLayer * layer() const
Returns raster layer with elevation model to be used for terrain generation.
void writeXml(QDomElement &elem) const override
Write terrain generator's configuration to XML.
QgsChunkLoader * createChunkLoader(QgsChunkNode *node) const override
void setLayer(QgsRasterLayer *layer)
Sets raster layer with elevation model to be used for terrain generation.
QgsDemTerrainGenerator()=default
Constructor for QgsDemTerrainGenerator.
virtual QgsRectangle extent() const
Returns the extent of the layer.
QgsCoordinateReferenceSystem crs
Definition: qgsmaplayer.h:79
Encapsulates a QGIS project, including sets of map layers and their styles, layouts,...
Definition: qgsproject.h:104
Q_INVOKABLE QgsMapLayer * mapLayer(const QString &layerId) const
Retrieve a pointer to a registered layer by layer ID.
Represents a raster layer.
A rectangle specified with double values.
Definition: qgsrectangle.h:42
Type
Enumeration of the available terrain generators.
@ Dem
Terrain is built from raster layer with digital elevation model.
QgsTilingScheme mTerrainTilingScheme
Tiling scheme of the terrain.
QgsCoordinateReferenceSystem crs() const
Returns CRS of the terrain.
QgsTerrainEntity * mTerrain
void setTerrain(QgsTerrainEntity *t)
Sets terrain entity for the generator (does not transfer ownership)
QgsRectangle tileToExtent(int x, int y, int z) const
Returns map coordinates of the extent of a tile.
_LayerRef< QgsMapLayer > QgsMapLayerRef
const QgsCoordinateReferenceSystem & crs
QPointer< TYPE > layer
Weak pointer to map layer.
QString layerId
Original layer ID.