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qgsmeshlayerrenderer.h
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qgsmeshlayerrenderer.h
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/***************************************************************************
qgsmeshlayerrenderer.h
----------------------
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. *
* *
***************************************************************************/
#ifndef QGSMESHLAYERRENDERER_H
#define QGSMESHLAYERRENDERER_H
class QgsMeshLayer;
class QgsSymbol;
#define SIP_NO_FILE
#include <memory>
#include <limits>
#include "qgis.h"
#include "qgsmaplayerrenderer.h"
#include "qgsrasterinterface.h"
#include "qgsrendercontext.h"
#include "qgstriangularmesh.h"
#include "qgsmeshlayer.h"
#include "qgssymbol.h"
///@cond PRIVATE
/**
* Feedback for mesh layer rendering - right now derived from raster block feedback so that we
* can pass it to block reading in the raster interface.
*/
class QgsMeshLayerRendererFeedback : public QgsRasterBlockFeedback
{
};
///@endcond
/**
* \ingroup core
* Implementation of threaded rendering for mesh layers.
*
* \note not available in Python bindings
* \since QGIS 3.2
*/
class QgsMeshLayerRenderer : public QgsMapLayerRenderer
{
public:
//! Ctor
QgsMeshLayerRenderer( QgsMeshLayer *layer, QgsRenderContext &context );
~QgsMeshLayerRenderer() override = default;
QgsFeedback *feedback() const override;
bool render() override;
private:
void renderMesh( const std::unique_ptr<QgsSymbol> &symbol, const QVector<QgsMeshFace> &faces );
void renderScalarDataset();
void renderVectorDataset();
void copyScalarDatasetValues( QgsMeshLayer *layer );
void copyVectorDatasetValues( QgsMeshLayer *layer );
void assignDefaultScalarShader( );
void createMeshSymbol( std::unique_ptr<QgsSymbol> &symbol, const QgsMeshRendererMeshSettings &settings );
void calculateOutputSize();
protected:
//! feedback class for cancelation
std::unique_ptr<QgsMeshLayerRendererFeedback> mFeedback;
// copy from mesh layer
QgsMesh mNativeMesh;
// copy from mesh layer
QgsTriangularMesh mTriangularMesh;
// copy of the scalar dataset
QVector<double> mScalarDatasetValues;
bool mScalarDataOnVertices = true;
double mScalarDatasetMinimum = std::numeric_limits<double>::quiet_NaN();
double mScalarDatasetMaximum = std::numeric_limits<double>::quiet_NaN();
// copy of the vector dataset
QVector<double> mVectorDatasetValuesX;
QVector<double> mVectorDatasetValuesY;
QVector<double> mVectorDatasetValuesMag;
double mVectorDatasetMagMinimum = std::numeric_limits<double>::quiet_NaN();
double mVectorDatasetMagMaximum = std::numeric_limits<double>::quiet_NaN();
bool mVectorDataOnVertices = true;
// copy from mesh layer
std::unique_ptr<QgsSymbol> mNativeMeshSymbol = nullptr;
// copy from mesh layer
std::unique_ptr<QgsSymbol> mTriangularMeshSymbol = nullptr;
// rendering context
QgsRenderContext &mContext;
// copy of rendering settings
QgsMeshRendererMeshSettings mRendererNativeMeshSettings;
QgsMeshRendererMeshSettings mRendererTriangularMeshSettings;
QgsMeshRendererScalarSettings mRendererScalarSettings;
QgsMeshRendererVectorSettings mRendererVectorSettings;
// output screen size
QSize mOutputSize;
};
#endif // QGSMESHLAYERRENDERER_H