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qgsmeshlayerrenderer.cpp
310 lines (257 loc) · 11.4 KB
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qgsmeshlayerrenderer.cpp
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/***************************************************************************
qgsmeshlayerrenderer.cpp
------------------------
begin : April 2018
copyright : (C) 2018 by Peter Petrik
email : zilolv at gmail dot 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. *
* *
***************************************************************************/
#include <memory>
#include "qgsmeshlayerrenderer.h"
#include "qgsfield.h"
#include "qgslogger.h"
#include "qgsmeshlayer.h"
#include "qgspointxy.h"
#include "qgsrenderer.h"
#include "qgssinglesymbolrenderer.h"
#include "qgssymbol.h"
#include "qgssinglebandpseudocolorrenderer.h"
#include "qgsrastershader.h"
#include "qgsmeshlayerinterpolator.h"
#include "qgsmeshlayerutils.h"
#include "qgsmeshvectorrenderer.h"
#include "qgsfillsymbollayer.h"
#include "qgssettings.h"
#include "qgsstyle.h"
QgsMeshLayerRenderer::QgsMeshLayerRenderer( QgsMeshLayer *layer, QgsRenderContext &context )
: QgsMapLayerRenderer( layer->id() )
, mFeedback( new QgsMeshLayerRendererFeedback )
, mContext( context )
, mRendererSettings( layer->rendererSettings() )
{
// make copies for mesh data
Q_ASSERT( layer->nativeMesh() );
Q_ASSERT( layer->triangularMesh() );
Q_ASSERT( layer->rendererCache() );
Q_ASSERT( layer->dataProvider() );
mNativeMesh = *( layer->nativeMesh() );
mTriangularMesh = *( layer->triangularMesh() );
createMeshSymbol( mNativeMeshSymbol, mRendererSettings.nativeMeshSettings() );
createMeshSymbol( mTriangularMeshSymbol, mRendererSettings.triangularMeshSettings() );
copyScalarDatasetValues( layer );
copyVectorDatasetValues( layer );
calculateOutputSize();
}
QgsFeedback *QgsMeshLayerRenderer::feedback() const
{
return mFeedback.get();
}
void QgsMeshLayerRenderer::calculateOutputSize()
{
// figure out image size
QgsRectangle extent = mContext.extent(); // this is extent in layer's coordinate system - but we need it in map coordinate system
QgsMapToPixel mapToPixel = mContext.mapToPixel();
QgsPointXY topleft = mapToPixel.transform( extent.xMinimum(), extent.yMaximum() );
QgsPointXY bottomright = mapToPixel.transform( extent.xMaximum(), extent.yMinimum() );
int width = int( bottomright.x() - topleft.x() );
int height = int( bottomright.y() - topleft.y() );
mOutputSize = QSize( width, height );
}
void QgsMeshLayerRenderer::createMeshSymbol( std::unique_ptr<QgsSymbol> &symbol,
const QgsMeshRendererMeshSettings &settings )
{
if ( settings.isEnabled() )
{
QgsSymbolLayerList l1;
l1 << new QgsSimpleFillSymbolLayer( Qt::white,
Qt::NoBrush,
settings.color(),
Qt::SolidLine,
settings.lineWidth() );
symbol.reset( new QgsFillSymbol( l1 ) );
}
}
void QgsMeshLayerRenderer::copyScalarDatasetValues( QgsMeshLayer *layer )
{
const QgsMeshDatasetIndex datasetIndex = mRendererSettings.activeScalarDataset();
// Find out if we can use cache up to date. If yes, use it and return
const int datasetGroupCount = layer->dataProvider()->datasetGroupCount();
QgsMeshLayerRendererCache *cache = layer->rendererCache();
if ( ( cache->mDatasetGroupsCount == datasetGroupCount ) &&
( cache->mActiveScalarDatasetIndex == datasetIndex ) )
{
mScalarDatasetValues = cache->mScalarDatasetValues;
mScalarActiveFaceFlagValues = cache->mScalarActiveFaceFlagValues;
mScalarDataOnVertices = cache->mScalarDataOnVertices;
mScalarDatasetMinimum = cache->mScalarDatasetMinimum;
mScalarDatasetMaximum = cache->mScalarDatasetMaximum;
return;
}
// Cache is not up-to-date, gather data
if ( datasetIndex.isValid() )
{
const QgsMeshDatasetGroupMetadata metadata = layer->dataProvider()->datasetGroupMetadata( datasetIndex );
mScalarDataOnVertices = metadata.dataType() == QgsMeshDatasetGroupMetadata::DataOnVertices;
int count;
if ( mScalarDataOnVertices )
count = mNativeMesh.vertices.count();
else
count = mNativeMesh.faces.count();
mScalarDatasetValues.resize( count );
for ( int i = 0; i < count; ++i )
{
double v = layer->dataProvider()->datasetValue( datasetIndex, i ).scalar();
mScalarDatasetValues[i] = v;
}
// populate face active flag, always defined on faces
mScalarActiveFaceFlagValues.resize( mNativeMesh.faces.count() );
for ( int i = 0; i < mNativeMesh.faces.count(); ++i )
{
bool active = layer->dataProvider()->isFaceActive( datasetIndex, i );
mScalarActiveFaceFlagValues[i] = active;
}
QgsMeshLayerUtils::calculateMinimumMaximum( mScalarDatasetMinimum, mScalarDatasetMaximum, mScalarDatasetValues );
}
// update cache
cache->mDatasetGroupsCount = datasetGroupCount;
cache->mActiveScalarDatasetIndex = datasetIndex;
cache->mScalarDatasetValues = mScalarDatasetValues;
cache->mScalarActiveFaceFlagValues = mScalarActiveFaceFlagValues;
cache->mScalarDataOnVertices = mScalarDataOnVertices;
cache->mScalarDatasetMinimum = mScalarDatasetMinimum;
cache->mScalarDatasetMaximum = mScalarDatasetMaximum;
}
void QgsMeshLayerRenderer::copyVectorDatasetValues( QgsMeshLayer *layer )
{
const QgsMeshDatasetIndex datasetIndex = mRendererSettings.activeVectorDataset();
// Find out if we can use cache up to date. If yes, use it and return
const int datasetGroupCount = layer->dataProvider()->datasetGroupCount();
QgsMeshLayerRendererCache *cache = layer->rendererCache();
if ( ( cache->mDatasetGroupsCount == datasetGroupCount ) &&
( cache->mActiveVectorDatasetIndex == datasetIndex ) )
{
mVectorDatasetValuesX = cache->mVectorDatasetValuesX;
mVectorDatasetValuesY = cache->mVectorDatasetValuesY;
mVectorDatasetValuesMag = cache->mVectorDatasetValuesMag;
mVectorDatasetMagMinimum = cache->mVectorDatasetMagMinimum;
mVectorDatasetMagMaximum = cache->mVectorDatasetMagMaximum;
mVectorDataOnVertices = cache->mVectorDataOnVertices;
return;
}
// Cache is not up-to-date, gather data
if ( datasetIndex.isValid() )
{
const QgsMeshDatasetGroupMetadata metadata = layer->dataProvider()->datasetGroupMetadata( datasetIndex );
bool isScalar = metadata.isScalar();
if ( isScalar )
{
QgsDebugMsg( "Dataset has no vector values" );
}
else
{
mVectorDataOnVertices = metadata.dataType() == QgsMeshDatasetGroupMetadata::DataOnVertices;
int count;
if ( mVectorDataOnVertices )
count = mNativeMesh.vertices.count();
else
count = mNativeMesh.faces.count();
mVectorDatasetValuesX.resize( count );
mVectorDatasetValuesY.resize( count );
mVectorDatasetValuesMag.resize( count );
for ( int i = 0; i < count; ++i )
{
double x = layer->dataProvider()->datasetValue( datasetIndex, i ).x();
mVectorDatasetValuesX[i] = x;
double y = layer->dataProvider()->datasetValue( datasetIndex, i ).y();
mVectorDatasetValuesY[i] = y;
double mag = layer->dataProvider()->datasetValue( datasetIndex, i ).scalar();
mVectorDatasetValuesMag[i] = mag;
}
}
QgsMeshLayerUtils::calculateMinimumMaximum( mVectorDatasetMagMinimum, mVectorDatasetMagMaximum, mVectorDatasetValuesMag );
}
// update cache
cache->mDatasetGroupsCount = datasetGroupCount;
cache->mActiveVectorDatasetIndex = datasetIndex;
cache->mVectorDatasetValuesX = mVectorDatasetValuesX;
cache->mVectorDatasetValuesY = mVectorDatasetValuesY;
cache->mVectorDatasetValuesMag = mVectorDatasetValuesMag;
cache->mVectorDatasetMagMinimum = mVectorDatasetMagMinimum;
cache->mVectorDatasetMagMaximum = mVectorDatasetMagMaximum;
cache->mVectorDataOnVertices = mVectorDataOnVertices;
}
bool QgsMeshLayerRenderer::render()
{
renderScalarDataset();
renderMesh( mNativeMeshSymbol, mNativeMesh.faces ); // native mesh
renderMesh( mTriangularMeshSymbol, mTriangularMesh.triangles() ); // triangular mesh
renderVectorDataset();
return true;
}
void QgsMeshLayerRenderer::renderMesh( const std::unique_ptr<QgsSymbol> &symbol, const QVector<QgsMeshFace> &faces )
{
if ( !symbol )
return;
QgsFields fields;
QgsSingleSymbolRenderer renderer( symbol->clone() );
renderer.startRender( mContext, fields );
for ( int i = 0; i < faces.size(); ++i )
{
if ( mContext.renderingStopped() )
break;
const QgsMeshFace &face = faces[i];
QgsFeature feat;
feat.setFields( fields );
QgsGeometry geom = QgsMeshUtils::toGeometry( face, mTriangularMesh.vertices() ); //Triangular mesh vertices contains also native mesh vertices
feat.setGeometry( geom );
renderer.renderFeature( feat, mContext );
}
renderer.stopRender( mContext );
}
void QgsMeshLayerRenderer::renderScalarDataset()
{
if ( mScalarDatasetValues.isEmpty() )
return; // activeScalarDataset == NO_ACTIVE_MESH_DATASET
if ( std::isnan( mScalarDatasetMinimum ) || std::isnan( mScalarDatasetMaximum ) )
return; // only NODATA values
QgsMeshDatasetIndex index = mRendererSettings.activeScalarDataset();
if ( !index.isValid() )
return; // no shader
const QgsMeshRendererScalarSettings scalarSettings = mRendererSettings.scalarSettings( index.group() );
QgsColorRampShader *fcn = new QgsColorRampShader( scalarSettings.colorRampShader() );
QgsRasterShader *sh = new QgsRasterShader();
sh->setRasterShaderFunction( fcn ); // takes ownership of fcn
QgsMeshLayerInterpolator interpolator( mTriangularMesh, mScalarDatasetValues, mScalarActiveFaceFlagValues,
mScalarDataOnVertices, mContext, mOutputSize );
QgsSingleBandPseudoColorRenderer renderer( &interpolator, 0, sh ); // takes ownership of sh
renderer.setClassificationMin( scalarSettings.classificationMinimum() );
renderer.setClassificationMax( scalarSettings.classificationMaximum() );
renderer.setOpacity( scalarSettings.opacity() );
std::unique_ptr<QgsRasterBlock> bl( renderer.block( 0, mContext.extent(), mOutputSize.width(), mOutputSize.height(), mFeedback.get() ) );
QImage img = bl->image();
mContext.painter()->drawImage( 0, 0, img );
}
void QgsMeshLayerRenderer::renderVectorDataset()
{
QgsMeshDatasetIndex index = mRendererSettings.activeVectorDataset();
if ( !index.isValid() )
return;
if ( mVectorDatasetValuesX.isEmpty() )
return;
if ( std::isnan( mVectorDatasetMagMinimum ) || std::isnan( mVectorDatasetMagMaximum ) )
return; // only NODATA values
if ( mVectorDatasetValuesX.size() != mVectorDatasetValuesY.size() )
return;
QgsMeshVectorRenderer renderer( mTriangularMesh,
mVectorDatasetValuesX, mVectorDatasetValuesY, mVectorDatasetValuesMag,
mVectorDatasetMagMinimum, mVectorDatasetMagMaximum,
mVectorDataOnVertices, mRendererSettings.vectorSettings( index.group() ), mContext, mOutputSize );
renderer.draw();
}