QGIS API Documentation 3.27.0-Master (1c05421486)
qgscolorramptexture.cpp
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1/***************************************************************************
2 qgscolorramptexture.h
3 -------------------------
4 begin : january 2020
5 copyright : (C) 2020 by Vincent Cloarec
6 email : vcloarec 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#include "qgscolorramptexture.h"
19
21
22// ColorRampTextureGenerator
23
24QgsColorRampTextureGenerator::QgsColorRampTextureGenerator( const QgsColorRampShader &colorRampShader, double verticalScale )
25 : mColorRampShader( colorRampShader )
26 , mVerticalScale( verticalScale )
27{
28}
29
30Qt3DRender::QTextureImageDataPtr QgsColorRampTextureGenerator::operator()()
31{
32 Qt3DRender::QTextureImageDataPtr dataPtr = Qt3DRender::QTextureImageDataPtr::create();
33 dataPtr->setFormat( QOpenGLTexture::RGBA32F );
34 dataPtr->setTarget( QOpenGLTexture::Target1D );
35 dataPtr->setPixelFormat( QOpenGLTexture::RGBA );
36 dataPtr->setPixelType( QOpenGLTexture::Float32 );
37
38 QByteArray data;
39 const QList<QgsColorRampShader::ColorRampItem> colorItemList = mColorRampShader.colorRampItemList();
40 const int size = colorItemList.count() ;
41
42 dataPtr->setWidth( size );
43 dataPtr->setHeight( 1 );
44 dataPtr->setDepth( 1 );
45 dataPtr->setFaces( 1 );
46 dataPtr->setLayers( 1 );
47 dataPtr->setMipLevels( 1 );
48
49 for ( int i = 0; i < colorItemList.count(); ++i )
50 {
51 float mag = float( colorItemList.at( i ).value * mVerticalScale );
52
53 const QColor color = colorItemList.at( i ).color;
54 if ( color.alphaF() == 0.0f )
55 continue;
56 float rf = float( color.redF() );
57 float gf = float( color.greenF() );
58 float bf = float( color.blueF() );
59
60 data.append( reinterpret_cast<const char *>( &mag ), sizeof( float ) );
61 data.append( reinterpret_cast<const char *>( &rf ), sizeof( float ) );
62 data.append( reinterpret_cast<const char *>( &gf ), sizeof( float ) );
63 data.append( reinterpret_cast<const char *>( &bf ), sizeof( float ) );
64 }
65
66 dataPtr->setData( data, sizeof( float ) ); //size is the size of the type, here float
67
68 return dataPtr;
69}
70
71bool QgsColorRampTextureGenerator::operator==( const Qt3DRender::QTextureImageDataGenerator &other ) const
72{
73 const QgsColorRampTextureGenerator *otherFunctor = functor_cast<QgsColorRampTextureGenerator>( &other );
74 if ( !otherFunctor )
75 return false;
76
77 return mColorRampShader == otherFunctor->mColorRampShader;
78}
79
80// ColorRampTexture
81
82QgsColorRampTexture::QgsColorRampTexture( const QgsColorRampShader &colorRampShader, double verticalScale, Qt3DCore::QNode *parent )
83 : Qt3DRender::QAbstractTextureImage( parent ),
84 mColorRampShader( colorRampShader ),
85 mVerticalScale( verticalScale )
86{
87
88}
89
90Qt3DRender::QTextureImageDataGeneratorPtr QgsColorRampTexture::dataGenerator() const
91{
92 return Qt3DRender::QTextureImageDataGeneratorPtr( new QgsColorRampTextureGenerator( mColorRampShader, mVerticalScale ) );
93}
94
A ramp shader will color a raster pixel based on a list of values ranges in a ramp.
bool operator==(const QgsFeatureIterator &fi1, const QgsFeatureIterator &fi2)