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qgstransformeffect.cpp
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qgstransformeffect.cpp
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/***************************************************************************
qgstransformeffect.cpp
----------------------
begin : March 2015
copyright : (C) 2015 Nyall Dawson
email : nyall dot dawson 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 "qgstransformeffect.h"
#include "qgssymbollayerv2utils.h"
#include "qgsunittypes.h"
#include <QPicture>
#include <QTransform>
QgsPaintEffect* QgsTransformEffect::create( const QgsStringMap &map )
{
QgsTransformEffect* newEffect = new QgsTransformEffect();
newEffect->readProperties( map );
return newEffect;
}
QgsTransformEffect::QgsTransformEffect()
: QgsPaintEffect()
, mTranslateX( 0.0 )
, mTranslateY( 0.0 )
, mTranslateUnit( QgsSymbolV2::MM )
, mScaleX( 1.0 )
, mScaleY( 1.0 )
, mRotation( 0.0 )
, mShearX( 0.0 )
, mShearY( 0.0 )
, mReflectX( false )
, mReflectY( false )
{
}
QgsTransformEffect::~QgsTransformEffect()
{
}
void QgsTransformEffect::draw( QgsRenderContext &context )
{
if ( !source() || !enabled() || !context.painter() )
return;
QPainter* painter = context.painter();
//apply transformations
painter->save();
QTransform t = createTransform( context );
painter->setTransform( t, true );
drawSource( *painter );
painter->restore();
}
QgsStringMap QgsTransformEffect::properties() const
{
QgsStringMap props;
props.insert( "reflect_x", mReflectX ? "1" : "0" );
props.insert( "reflect_y", mReflectY ? "1" : "0" );
props.insert( "scale_x", QString::number( mScaleX ) );
props.insert( "scale_y", QString::number( mScaleY ) );
props.insert( "rotation", QString::number( mRotation ) );
props.insert( "shear_x", QString::number( mShearX ) );
props.insert( "shear_y", QString::number( mShearY ) );
props.insert( "translate_x", QString::number( mTranslateX ) );
props.insert( "translate_y", QString::number( mTranslateY ) );
props.insert( "translate_unit", QgsSymbolLayerV2Utils::encodeOutputUnit( mTranslateUnit ) );
props.insert( "translate_unit_scale", QgsSymbolLayerV2Utils::encodeMapUnitScale( mTranslateMapUnitScale ) );
props.insert( "enabled", mEnabled ? "1" : "0" );
props.insert( "draw_mode", QString::number( int( mDrawMode ) ) );
return props;
}
void QgsTransformEffect::readProperties( const QgsStringMap &props )
{
mEnabled = props.value( "enabled", "1" ).toInt();
mDrawMode = static_cast< QgsPaintEffect::DrawMode >( props.value( "draw_mode", "2" ).toInt() );
mReflectX = props.value( "reflect_x", "0" ).toInt();
mReflectY = props.value( "reflect_y", "0" ).toInt();
mScaleX = props.value( "scale_x", "1.0" ).toDouble();
mScaleY = props.value( "scale_y", "1.0" ).toDouble();
mRotation = props.value( "rotation", "0.0" ).toDouble();
mTranslateX = props.value( "translate_x", "0.0" ).toDouble();
mTranslateY = props.value( "translate_y", "0.0" ).toDouble();
mTranslateUnit = QgsSymbolLayerV2Utils::decodeOutputUnit( props.value( "translate_unit" ) );
mTranslateMapUnitScale = QgsSymbolLayerV2Utils::decodeMapUnitScale( props.value( "translate_unit_scale" ) );
}
QgsTransformEffect* QgsTransformEffect::clone() const
{
QgsTransformEffect* newEffect = new QgsTransformEffect( *this );
return newEffect;
}
QRectF QgsTransformEffect::boundingRect( const QRectF &rect, const QgsRenderContext& context ) const
{
QTransform t = createTransform( context );
return t.mapRect( rect );
}
QTransform QgsTransformEffect::createTransform( const QgsRenderContext& context ) const
{
QTransform t;
if ( !source() )
return t;
int width = source()->boundingRect().width();
int height = source()->boundingRect().height();
int top = source()->boundingRect().top();
int left = source()->boundingRect().left();
//remember that the below operations are effectively performed in the opposite order
//so, first the reflection applies, then scale, shear, rotate and lastly translation
double translateX = mTranslateX *
QgsSymbolLayerV2Utils::pixelSizeScaleFactor( context, mTranslateUnit, mTranslateMapUnitScale );
double translateY = mTranslateY *
QgsSymbolLayerV2Utils::pixelSizeScaleFactor( context, mTranslateUnit, mTranslateMapUnitScale );
t.translate( translateX + left + width / 2.0,
translateY + top + height / 2.0 );
t.rotate( mRotation );
t.shear( mShearX, mShearY );
t.scale( mScaleX, mScaleY );
if ( mReflectX || mReflectY )
{
t.scale( mReflectX ? -1 : 1, mReflectY ? -1 : 1 );
}
t.translate( -left - width / 2.0,
-top - height / 2.0 );
return t;
}