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| 1 | +/*************************************************************************** |
| 2 | + qgsalgorithmrotate.cpp |
| 3 | + --------------------- |
| 4 | + begin : March 2018 |
| 5 | + copyright : (C) 2018 by Nyall Dawson |
| 6 | + email : nyall dot dawson 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 "qgsalgorithmrotate.h" |
| 19 | + |
| 20 | +///@cond PRIVATE |
| 21 | + |
| 22 | +QString QgsRotateFeaturesAlgorithm::name() const |
| 23 | +{ |
| 24 | + return QStringLiteral( "rotatefeatures" ); |
| 25 | +} |
| 26 | + |
| 27 | +QString QgsRotateFeaturesAlgorithm::displayName() const |
| 28 | +{ |
| 29 | + return QObject::tr( "Rotate" ); |
| 30 | +} |
| 31 | + |
| 32 | +QStringList QgsRotateFeaturesAlgorithm::tags() const |
| 33 | +{ |
| 34 | + return QObject::tr( "rotate,around,center,point" ).split( ',' ); |
| 35 | +} |
| 36 | + |
| 37 | +QString QgsRotateFeaturesAlgorithm::group() const |
| 38 | +{ |
| 39 | + return QObject::tr( "Vector geometry" ); |
| 40 | +} |
| 41 | + |
| 42 | +QString QgsRotateFeaturesAlgorithm::groupId() const |
| 43 | +{ |
| 44 | + return QStringLiteral( "vectorgeometry" ); |
| 45 | +} |
| 46 | + |
| 47 | +QString QgsRotateFeaturesAlgorithm::outputName() const |
| 48 | +{ |
| 49 | + return QObject::tr( "Rotated" ); |
| 50 | +} |
| 51 | + |
| 52 | +QString QgsRotateFeaturesAlgorithm::shortHelpString() const |
| 53 | +{ |
| 54 | + return QObject::tr( "This algorithm rotates feature geometries, by the specified angle clockwise" ) |
| 55 | + + QStringLiteral( "\n\n" ) |
| 56 | + + QObject::tr( "Optionally, the rotation can occur around a preset point. If not set the rotation occurs around each feature's centroid." ); |
| 57 | +} |
| 58 | + |
| 59 | +QgsRotateFeaturesAlgorithm *QgsRotateFeaturesAlgorithm::createInstance() const |
| 60 | +{ |
| 61 | + return new QgsRotateFeaturesAlgorithm(); |
| 62 | +} |
| 63 | + |
| 64 | +void QgsRotateFeaturesAlgorithm::initParameters( const QVariantMap & ) |
| 65 | +{ |
| 66 | + std::unique_ptr< QgsProcessingParameterNumber > rotation = qgis::make_unique< QgsProcessingParameterNumber >( QStringLiteral( "ANGLE" ), |
| 67 | + QObject::tr( "Rotation (degrees clockwise)" ), QgsProcessingParameterNumber::Double, |
| 68 | + 0.0 ); |
| 69 | + rotation->setIsDynamic( true ); |
| 70 | + rotation->setDynamicPropertyDefinition( QgsPropertyDefinition( QStringLiteral( "ANGLE" ), QObject::tr( "Rotation (degrees clockwise)" ), QgsPropertyDefinition::Rotation ) ); |
| 71 | + rotation->setDynamicLayerParameterName( QStringLiteral( "INPUT" ) ); |
| 72 | + addParameter( rotation.release() ); |
| 73 | + |
| 74 | + std::unique_ptr< QgsProcessingParameterPoint > anchor = qgis::make_unique< QgsProcessingParameterPoint >( QStringLiteral( "ANCHOR" ), |
| 75 | + QObject::tr( "Rotation anchor point" ), QVariant(), true ); |
| 76 | + addParameter( anchor.release() ); |
| 77 | +} |
| 78 | + |
| 79 | +bool QgsRotateFeaturesAlgorithm::prepareAlgorithm( const QVariantMap ¶meters, QgsProcessingContext &context, QgsProcessingFeedback * ) |
| 80 | +{ |
| 81 | + mAngle = parameterAsDouble( parameters, QStringLiteral( "ANGLE" ), context ); |
| 82 | + mDynamicAngle = QgsProcessingParameters::isDynamic( parameters, QStringLiteral( "ANGLE" ) ); |
| 83 | + if ( mDynamicAngle ) |
| 84 | + mAngleProperty = parameters.value( QStringLiteral( "ANGLE" ) ).value< QgsProperty >(); |
| 85 | + |
| 86 | + mUseAnchor = parameters.value( "ANCHOR" ).isValid(); |
| 87 | + if ( mUseAnchor ) |
| 88 | + { |
| 89 | + mAnchor = parameterAsPoint( parameters, QStringLiteral( "ANCHOR" ), context ); |
| 90 | + mAnchorCrs = parameterAsPointCrs( parameters, QStringLiteral( "ANCHOR" ), context ); |
| 91 | + } |
| 92 | + |
| 93 | + return true; |
| 94 | +} |
| 95 | + |
| 96 | +QgsFeatureList QgsRotateFeaturesAlgorithm::processFeature( const QgsFeature &feature, QgsProcessingContext &context, QgsProcessingFeedback *feedback ) |
| 97 | +{ |
| 98 | + if ( mUseAnchor && !mTransformedAnchor ) |
| 99 | + { |
| 100 | + mTransformedAnchor = true; |
| 101 | + if ( mAnchorCrs != sourceCrs() ) |
| 102 | + { |
| 103 | + QgsCoordinateTransform ct( mAnchorCrs, sourceCrs(), context.transformContext() ); |
| 104 | + try |
| 105 | + { |
| 106 | + mAnchor = ct.transform( mAnchor ); |
| 107 | + } |
| 108 | + catch ( QgsCsException & ) |
| 109 | + { |
| 110 | + throw QgsProcessingException( QObject::tr( "Could not transform anchor point to destination CRS" ) ); |
| 111 | + } |
| 112 | + } |
| 113 | + } |
| 114 | + |
| 115 | + QgsFeature f = feature; |
| 116 | + if ( f.hasGeometry() ) |
| 117 | + { |
| 118 | + QgsGeometry geometry = f.geometry(); |
| 119 | + |
| 120 | + double angle = mAngle; |
| 121 | + if ( mDynamicAngle ) |
| 122 | + angle = mAngleProperty.valueAsDouble( context.expressionContext(), angle ); |
| 123 | + |
| 124 | + if ( mUseAnchor ) |
| 125 | + { |
| 126 | + geometry.rotate( angle, mAnchor ); |
| 127 | + f.setGeometry( geometry ); |
| 128 | + } |
| 129 | + else |
| 130 | + { |
| 131 | + QgsGeometry centroid = geometry.centroid(); |
| 132 | + if ( centroid ) |
| 133 | + { |
| 134 | + geometry.rotate( angle, centroid.asPoint() ); |
| 135 | + f.setGeometry( geometry ); |
| 136 | + } |
| 137 | + else |
| 138 | + { |
| 139 | + feedback->reportError( QObject::tr( "Could not calculate centroid for feature %1: %2" ).arg( feature.id() ).arg( centroid.lastError() ) ); |
| 140 | + } |
| 141 | + } |
| 142 | + } |
| 143 | + return QgsFeatureList() << f; |
| 144 | +} |
| 145 | + |
| 146 | + |
| 147 | +///@endcond |
| 148 | + |
| 149 | + |
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