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qgsmeshlayer.cpp
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qgsmeshlayer.cpp
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/***************************************************************************
qgsmeshlayer.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 <cstddef>
#include <limits>
#include <QUuid>
#include "qgscolorramp.h"
#include "qgslogger.h"
#include "qgsmaplayerlegend.h"
#include "qgsmeshdataprovider.h"
#include "qgsmeshlayer.h"
#include "qgsmeshlayerrenderer.h"
#include "qgsmeshlayerutils.h"
#include "qgsproviderregistry.h"
#include "qgsreadwritecontext.h"
#include "qgsstyle.h"
#include "qgstriangularmesh.h"
QgsMeshLayer::QgsMeshLayer( const QString &meshLayerPath,
const QString &baseName,
const QString &providerKey,
const LayerOptions & )
: QgsMapLayer( MeshLayer, baseName, meshLayerPath )
, mProviderKey( providerKey )
{
// load data
QgsDataProvider::ProviderOptions providerOptions;
setDataProvider( providerKey, providerOptions );
setLegend( QgsMapLayerLegend::defaultMeshLegend( this ) );
// show at least the mesh by default so we render something
QgsMeshRendererMeshSettings meshSettings;
meshSettings.setEnabled( true );
mRendererSettings.setNativeMeshSettings( meshSettings );
} // QgsMeshLayer ctor
QgsMeshLayer::~QgsMeshLayer()
{
delete mDataProvider;
}
QgsMeshDataProvider *QgsMeshLayer::dataProvider()
{
return mDataProvider;
}
const QgsMeshDataProvider *QgsMeshLayer::dataProvider() const
{
return mDataProvider;
}
QgsMeshLayer *QgsMeshLayer::clone() const
{
QgsMeshLayer *layer = new QgsMeshLayer( source(), name(), mProviderKey );
QgsMapLayer::clone( layer );
return layer;
}
QgsRectangle QgsMeshLayer::extent() const
{
if ( mDataProvider )
return mDataProvider->extent();
else
{
QgsRectangle rec;
rec.setMinimal();
return rec;
}
}
QString QgsMeshLayer::providerType() const
{
return mProviderKey;
}
QgsMesh *QgsMeshLayer::nativeMesh() SIP_SKIP
{
return mNativeMesh.get();
}
QgsTriangularMesh *QgsMeshLayer::triangularMesh() SIP_SKIP
{
return mTriangularMesh.get();
}
QgsMeshRendererSettings QgsMeshLayer::rendererSettings() const
{
return mRendererSettings;
}
void QgsMeshLayer::setRendererSettings( const QgsMeshRendererSettings &settings )
{
mRendererSettings = settings;
emit rendererChanged();
triggerRepaint();
}
QgsMeshDatasetValue QgsMeshLayer::datasetValue( const QgsMeshDatasetIndex &index, const QgsPointXY &point ) const
{
QgsMeshDatasetValue value;
if ( mTriangularMesh && dataProvider() && dataProvider()->isValid() && index.isValid() )
{
int faceIndex = mTriangularMesh->faceIndexForPoint( point ) ;
if ( faceIndex >= 0 )
{
int nativeFaceIndex = mTriangularMesh->trianglesToNativeFaces().at( faceIndex );
if ( dataProvider()->isFaceActive( index, nativeFaceIndex ) )
{
if ( dataProvider()->datasetGroupMetadata( index ).dataType() == QgsMeshDatasetGroupMetadata::DataOnFaces )
{
int nativeFaceIndex = mTriangularMesh->trianglesToNativeFaces().at( faceIndex );
value = dataProvider()->datasetValue( index, nativeFaceIndex );
}
else
{
const QgsMeshFace &face = mTriangularMesh->triangles()[faceIndex];
const int v1 = face[0], v2 = face[1], v3 = face[2];
const QgsPoint p1 = mTriangularMesh->vertices()[v1], p2 = mTriangularMesh->vertices()[v2], p3 = mTriangularMesh->vertices()[v3];
const QgsMeshDatasetValue val1 = dataProvider()->datasetValue( index, v1 );
const QgsMeshDatasetValue val2 = dataProvider()->datasetValue( index, v2 );
const QgsMeshDatasetValue val3 = dataProvider()->datasetValue( index, v3 );
const double x = QgsMeshLayerUtils::interpolateFromVerticesData( p1, p2, p3, val1.x(), val2.x(), val3.x(), point );
double y = std::numeric_limits<double>::quiet_NaN();
bool isVector = dataProvider()->datasetGroupMetadata( index ).isVector();
if ( isVector )
y = QgsMeshLayerUtils::interpolateFromVerticesData( p1, p2, p3, val1.y(), val2.y(), val3.y(), point );
value = QgsMeshDatasetValue( x, y );
}
}
}
}
return value;
}
void QgsMeshLayer::fillNativeMesh()
{
Q_ASSERT( !mNativeMesh );
mNativeMesh.reset( new QgsMesh() );
if ( !( dataProvider() && dataProvider()->isValid() ) )
return;
mNativeMesh->vertices.resize( dataProvider()->vertexCount() );
for ( int i = 0; i < dataProvider()->vertexCount(); ++i )
{
mNativeMesh->vertices[i] = dataProvider()->vertex( i );
}
mNativeMesh->faces.resize( dataProvider()->faceCount() );
for ( int i = 0; i < dataProvider()->faceCount(); ++i )
{
mNativeMesh->faces[i] = dataProvider()->face( i );
}
}
void QgsMeshLayer::onDatasetGroupsAdded( int count )
{
// assign default style to new dataset groups
int newDatasetGroupCount = mDataProvider->datasetGroupCount();
for ( int i = newDatasetGroupCount - count; i < newDatasetGroupCount; ++i )
assignDefaultStyleToDatasetGroup( i );
}
static QgsColorRamp *_createDefaultColorRamp()
{
QgsColorRamp *ramp = QgsStyle::defaultStyle()->colorRamp( QStringLiteral( "Plasma" ) );
if ( ramp )
return ramp;
// definition of "Plasma" color ramp (in case it is not available in the style for some reason)
QgsStringMap props;
props["color1"] = "13,8,135,255";
props["color2"] = "240,249,33,255";
props["stops"] =
"0.0196078;27,6,141,255:0.0392157;38,5,145,255:0.0588235;47,5,150,255:0.0784314;56,4,154,255:0.0980392;65,4,157,255:"
"0.117647;73,3,160,255:0.137255;81,2,163,255:0.156863;89,1,165,255:0.176471;97,0,167,255:0.196078;105,0,168,255:"
"0.215686;113,0,168,255:0.235294;120,1,168,255:0.254902;128,4,168,255:0.27451;135,7,166,255:0.294118;142,12,164,255:"
"0.313725;149,17,161,255:0.333333;156,23,158,255:0.352941;162,29,154,255:0.372549;168,34,150,255:0.392157;174,40,146,255:"
"0.411765;180,46,141,255:0.431373;186,51,136,255:0.45098;191,57,132,255:0.470588;196,62,127,255:0.490196;201,68,122,255:"
"0.509804;205,74,118,255:0.529412;210,79,113,255:0.54902;214,85,109,255:0.568627;218,91,105,255:0.588235;222,97,100,255:"
"0.607843;226,102,96,255:0.627451;230,108,92,255:0.647059;233,114,87,255:0.666667;237,121,83,255:0.686275;240,127,79,255:"
"0.705882;243,133,75,255:0.72549;245,140,70,255:0.745098;247,147,66,255:0.764706;249,154,62,255:0.784314;251,161,57,255:"
"0.803922;252,168,53,255:0.823529;253,175,49,255:0.843137;254,183,45,255:0.862745;254,190,42,255:0.882353;253,198,39,255:"
"0.901961;252,206,37,255:0.921569;251,215,36,255:0.941176;248,223,37,255:0.960784;246,232,38,255:0.980392;243,240,39,255";
return QgsGradientColorRamp::create( props );
}
void QgsMeshLayer::assignDefaultStyleToDatasetGroup( int groupIndex )
{
double groupMin, groupMax;
QgsMeshLayerUtils::calculateMinMaxForDatasetGroup( groupMin, groupMax, mDataProvider, groupIndex );
QgsColorRampShader fcn( groupMin, groupMax, _createDefaultColorRamp() );
fcn.classifyColorRamp( 5, -1, QgsRectangle(), nullptr );
QgsMeshRendererScalarSettings scalarSettings;
scalarSettings.setClassificationMinimumMaximum( groupMin, groupMax );
scalarSettings.setColorRampShader( fcn );
mRendererSettings.setScalarSettings( groupIndex, scalarSettings );
}
QgsMapLayerRenderer *QgsMeshLayer::createMapRenderer( QgsRenderContext &rendererContext )
{
if ( !mNativeMesh )
{
// lazy loading of mesh data
fillNativeMesh();
}
if ( !mTriangularMesh )
mTriangularMesh.reset( new QgsTriangularMesh() );
mTriangularMesh->update( mNativeMesh.get(), &rendererContext );
return new QgsMeshLayerRenderer( this, rendererContext );
}
bool QgsMeshLayer::readSymbology( const QDomNode &node, QString &errorMessage,
QgsReadWriteContext &context, QgsMapLayerStyle::StyleCategories categories )
{
Q_UNUSED( errorMessage );
// TODO: implement categories for raster layer
QDomElement elem = node.toElement();
readCommonStyle( elem, context, categories );
QDomElement elemRendererSettings = elem.firstChildElement( "mesh-renderer-settings" );
if ( !elemRendererSettings.isNull() )
mRendererSettings.readXml( elemRendererSettings );
return true;
}
bool QgsMeshLayer::writeSymbology( QDomNode &node, QDomDocument &doc, QString &errorMessage,
const QgsReadWriteContext &context, QgsMapLayerStyle::StyleCategories categories ) const
{
Q_UNUSED( errorMessage );
// TODO: implement categories for raster layer
QDomElement elem = node.toElement();
writeCommonStyle( elem, doc, context, categories );
QDomElement elemRendererSettings = mRendererSettings.writeXml( doc );
elem.appendChild( elemRendererSettings );
return true;
}
QString QgsMeshLayer::decodedSource( const QString &source, const QString &provider, const QgsReadWriteContext &context ) const
{
QString src( source );
if ( provider == QLatin1String( "mdal" ) )
{
src = context.pathResolver().readPath( src );
}
return src;
}
QString QgsMeshLayer::encodedSource( const QString &source, const QgsReadWriteContext &context ) const
{
QString src( source );
if ( providerType() == QLatin1String( "mdal" ) )
{
src = context.pathResolver().writePath( src );
}
return src;
}
bool QgsMeshLayer::readXml( const QDomNode &layer_node, QgsReadWriteContext &context )
{
QgsDebugMsgLevel( QStringLiteral( "Datasource in QgsMeshLayer::readXml: %1" ).arg( mDataSource.toLocal8Bit().data() ), 3 );
//process provider key
QDomNode pkeyNode = layer_node.namedItem( QStringLiteral( "provider" ) );
if ( pkeyNode.isNull() )
{
mProviderKey.clear();
}
else
{
QDomElement pkeyElt = pkeyNode.toElement();
mProviderKey = pkeyElt.text();
}
QgsDataProvider::ProviderOptions providerOptions;
if ( !setDataProvider( mProviderKey, providerOptions ) )
{
return false;
}
QDomElement elemExtraDatasets = layer_node.firstChildElement( QStringLiteral( "extra-datasets" ) );
if ( !elemExtraDatasets.isNull() )
{
QDomElement elemUri = elemExtraDatasets.firstChildElement( QStringLiteral( "uri" ) );
while ( !elemUri.isNull() )
{
QString uri = context.pathResolver().readPath( elemUri.text() );
bool res = mDataProvider->addDataset( uri );
#ifdef QGISDEBUG
QgsDebugMsg( QStringLiteral( "extra dataset (res %1): %2" ).arg( res ).arg( uri ) );
#else
( void )res; // avoid unused warning in release builds
#endif
elemUri = elemUri.nextSiblingElement( QStringLiteral( "uri" ) );
}
}
QString errorMsg;
readSymbology( layer_node, errorMsg, context );
return mValid; // should be true if read successfully
}
bool QgsMeshLayer::writeXml( QDomNode &layer_node, QDomDocument &document, const QgsReadWriteContext &context ) const
{
// first get the layer element so that we can append the type attribute
QDomElement mapLayerNode = layer_node.toElement();
if ( mapLayerNode.isNull() || ( QLatin1String( "maplayer" ) != mapLayerNode.nodeName() ) )
{
QgsDebugMsgLevel( QStringLiteral( "can't find <maplayer>" ), 2 );
return false;
}
mapLayerNode.setAttribute( QStringLiteral( "type" ), QStringLiteral( "mesh" ) );
// add provider node
if ( mDataProvider )
{
QDomElement provider = document.createElement( QStringLiteral( "provider" ) );
QDomText providerText = document.createTextNode( providerType() );
provider.appendChild( providerText );
layer_node.appendChild( provider );
const QStringList extraDatasetUris = mDataProvider->extraDatasets();
QDomElement elemExtraDatasets = document.createElement( QStringLiteral( "extra-datasets" ) );
for ( const QString &uri : extraDatasetUris )
{
QString path = context.pathResolver().writePath( uri );
QDomElement elemUri = document.createElement( QStringLiteral( "uri" ) );
elemUri.appendChild( document.createTextNode( path ) );
elemExtraDatasets.appendChild( elemUri );
}
layer_node.appendChild( elemExtraDatasets );
}
// renderer specific settings
QString errorMsg;
return writeSymbology( layer_node, document, errorMsg, context );
}
bool QgsMeshLayer::setDataProvider( QString const &provider, const QgsDataProvider::ProviderOptions &options )
{
delete mDataProvider;
mProviderKey = provider;
QString dataSource = mDataSource;
mDataProvider = qobject_cast<QgsMeshDataProvider *>( QgsProviderRegistry::instance()->createProvider( provider, dataSource, options ) );
if ( !mDataProvider )
{
QgsDebugMsgLevel( QStringLiteral( "Unable to get mesh data provider" ), 2 );
return false;
}
mDataProvider->setParent( this );
QgsDebugMsgLevel( QStringLiteral( "Instantiated the mesh data provider plugin" ), 2 );
mValid = mDataProvider->isValid();
if ( !mValid )
{
QgsDebugMsgLevel( QStringLiteral( "Invalid mesh provider plugin %1" ).arg( QString( mDataSource.toUtf8() ) ), 2 );
return false;
}
if ( provider == QStringLiteral( "mesh_memory" ) )
{
// required so that source differs between memory layers
mDataSource = mDataSource + QStringLiteral( "&uid=%1" ).arg( QUuid::createUuid().toString() );
}
for ( int i = 0; i < mDataProvider->datasetGroupCount(); ++i )
assignDefaultStyleToDatasetGroup( i );
connect( mDataProvider, &QgsMeshDataProvider::dataChanged, this, &QgsMeshLayer::dataChanged );
connect( mDataProvider, &QgsMeshDataProvider::datasetGroupsAdded, this, &QgsMeshLayer::onDatasetGroupsAdded );
return true;
}