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qgslinesymbollayerv2.cpp
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qgslinesymbollayerv2.cpp
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/***************************************************************************
qgslinesymbollayerv2.cpp
---------------------
begin : November 2009
copyright : (C) 2009 by Martin Dobias
email : wonder dot sk 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 "qgslinesymbollayerv2.h"
#include "qgsdxfexport.h"
#include "qgssymbollayerv2utils.h"
#include "qgsexpression.h"
#include "qgsrendercontext.h"
#include "qgslogger.h"
#include "qgsvectorlayer.h"
#include "qgsgeometrysimplifier.h"
#include <QPainter>
#include <QDomDocument>
#include <QDomElement>
#include <cmath>
QgsSimpleLineSymbolLayerV2::QgsSimpleLineSymbolLayerV2( QColor color, double width, Qt::PenStyle penStyle )
: mPenStyle( penStyle ), mPenJoinStyle( DEFAULT_SIMPLELINE_JOINSTYLE ), mPenCapStyle( DEFAULT_SIMPLELINE_CAPSTYLE ), mOffset( 0 ), mOffsetUnit( QgsSymbolV2::MM ),
mUseCustomDashPattern( false ), mCustomDashPatternUnit( QgsSymbolV2::MM ), mDrawInsidePolygon( false )
{
mColor = color;
mWidth = width;
mCustomDashVector << 5 << 2;
}
void QgsSimpleLineSymbolLayerV2::setOutputUnit( QgsSymbolV2::OutputUnit unit )
{
QgsLineSymbolLayerV2::setOutputUnit( unit );
mWidthUnit = unit;
mOffsetUnit = unit;
mCustomDashPatternUnit = unit;
}
QgsSymbolV2::OutputUnit QgsSimpleLineSymbolLayerV2::outputUnit() const
{
QgsSymbolV2::OutputUnit unit = QgsLineSymbolLayerV2::outputUnit();
if ( mWidthUnit != unit || mOffsetUnit != unit || mCustomDashPatternUnit != unit )
{
return QgsSymbolV2::Mixed;
}
return unit;
}
void QgsSimpleLineSymbolLayerV2::setMapUnitScale( const QgsMapUnitScale &scale )
{
QgsLineSymbolLayerV2::setMapUnitScale( scale );
mWidthMapUnitScale = scale;
mOffsetMapUnitScale = scale;
mCustomDashPatternMapUnitScale = scale;
}
QgsMapUnitScale QgsSimpleLineSymbolLayerV2::mapUnitScale() const
{
if ( QgsLineSymbolLayerV2::mapUnitScale() == mWidthMapUnitScale &&
mWidthMapUnitScale == mOffsetMapUnitScale &&
mOffsetMapUnitScale == mCustomDashPatternMapUnitScale )
{
return mWidthMapUnitScale;
}
return QgsMapUnitScale();
}
QgsSymbolLayerV2* QgsSimpleLineSymbolLayerV2::create( const QgsStringMap& props )
{
QColor color = DEFAULT_SIMPLELINE_COLOR;
double width = DEFAULT_SIMPLELINE_WIDTH;
Qt::PenStyle penStyle = DEFAULT_SIMPLELINE_PENSTYLE;
if ( props.contains( "color" ) )
color = QgsSymbolLayerV2Utils::decodeColor( props["color"] );
if ( props.contains( "width" ) )
width = props["width"].toDouble();
if ( props.contains( "penstyle" ) )
penStyle = QgsSymbolLayerV2Utils::decodePenStyle( props["penstyle"] );
QgsSimpleLineSymbolLayerV2* l = new QgsSimpleLineSymbolLayerV2( color, width, penStyle );
if ( props.contains( "width_unit" ) )
l->setWidthUnit( QgsSymbolLayerV2Utils::decodeOutputUnit( props["width_unit"] ) );
if ( props.contains( "offset" ) )
l->setOffset( props["offset"].toDouble() );
if ( props.contains( "offset_unit" ) )
l->setOffsetUnit( QgsSymbolLayerV2Utils::decodeOutputUnit( props["offset_unit"] ) );
if ( props.contains( "offset_map_unit_scale" ) )
l->setOffsetMapUnitScale( QgsSymbolLayerV2Utils::decodeMapUnitScale( props["offset_map_unit_scale"] ) );
if ( props.contains( "joinstyle" ) )
l->setPenJoinStyle( QgsSymbolLayerV2Utils::decodePenJoinStyle( props["joinstyle"] ) );
if ( props.contains( "capstyle" ) )
l->setPenCapStyle( QgsSymbolLayerV2Utils::decodePenCapStyle( props["capstyle"] ) );
if ( props.contains( "use_custom_dash" ) )
{
l->setUseCustomDashPattern( props["use_custom_dash"].toInt() );
}
if ( props.contains( "customdash" ) )
{
l->setCustomDashVector( QgsSymbolLayerV2Utils::decodeRealVector( props["customdash"] ) );
}
if ( props.contains( "customdash_unit" ) )
{
l->setCustomDashPatternUnit( QgsSymbolLayerV2Utils::decodeOutputUnit( props["customdash_unit"] ) );
}
if ( props.contains( "customdash_map_unit_scale" ) )
{
l->setCustomDashPatternMapUnitScale( QgsSymbolLayerV2Utils::decodeMapUnitScale( props["customdash_map_unit_scale"] ) );
}
if ( props.contains( "draw_inside_polygon" ) )
{
l->setDrawInsidePolygon( props["draw_inside_polygon"].toInt() );
}
//data defined properties
if ( props.contains( "color_expression" ) )
l->setDataDefinedProperty( "color", props["color_expression"] );
if ( props.contains( "width_expression" ) )
l->setDataDefinedProperty( "width", props["width_expression"] );
if ( props.contains( "offset_expression" ) )
l->setDataDefinedProperty( "offset", props["offset_expression"] );
if ( props.contains( "customdash_expression" ) )
l->setDataDefinedProperty( "customdash", props["customdash_expression"] );
if ( props.contains( "joinstyle_expression" ) )
l->setDataDefinedProperty( "joinstyle", props["joinstyle_expression"] );
if ( props.contains( "capstyle_expression" ) )
l->setDataDefinedProperty( "capstyle", props["capstyle_expression"] );
return l;
}
QString QgsSimpleLineSymbolLayerV2::layerType() const
{
return "SimpleLine";
}
void QgsSimpleLineSymbolLayerV2::startRender( QgsSymbolV2RenderContext& context )
{
QColor penColor = mColor;
penColor.setAlphaF( mColor.alphaF() * context.alpha() );
mPen.setColor( penColor );
double scaledWidth = mWidth * QgsSymbolLayerV2Utils::lineWidthScaleFactor( context.renderContext(), mWidthUnit, mWidthMapUnitScale );
mPen.setWidthF( scaledWidth );
if ( mUseCustomDashPattern && scaledWidth != 0 )
{
mPen.setStyle( Qt::CustomDashLine );
//scale pattern vector
double dashWidthDiv = scaledWidth;
//fix dash pattern width in Qt 4.8
QStringList versionSplit = QString( qVersion() ).split( "." );
if ( versionSplit.size() > 1
&& versionSplit.at( 1 ).toInt() >= 8
&& ( scaledWidth * context.renderContext().rasterScaleFactor() ) < 1.0 )
{
dashWidthDiv = 1.0;
}
QVector<qreal> scaledVector;
QVector<qreal>::const_iterator it = mCustomDashVector.constBegin();
for ( ; it != mCustomDashVector.constEnd(); ++it )
{
//the dash is specified in terms of pen widths, therefore the division
scaledVector << ( *it ) * QgsSymbolLayerV2Utils::lineWidthScaleFactor( context.renderContext(), mCustomDashPatternUnit, mCustomDashPatternMapUnitScale ) / dashWidthDiv;
}
mPen.setDashPattern( scaledVector );
}
else
{
mPen.setStyle( mPenStyle );
}
mPen.setJoinStyle( mPenJoinStyle );
mPen.setCapStyle( mPenCapStyle );
mSelPen = mPen;
QColor selColor = context.renderContext().selectionColor();
if ( ! selectionIsOpaque )
selColor.setAlphaF( context.alpha() );
mSelPen.setColor( selColor );
//prepare expressions for data defined properties
prepareExpressions( context.fields(), context.renderContext().rendererScale() );
}
void QgsSimpleLineSymbolLayerV2::stopRender( QgsSymbolV2RenderContext& context )
{
Q_UNUSED( context );
}
void QgsSimpleLineSymbolLayerV2::renderPolygonOutline( const QPolygonF& points, QList<QPolygonF>* rings, QgsSymbolV2RenderContext& context )
{
QPainter* p = context.renderContext().painter();
if ( !p )
{
return;
}
if ( mDrawInsidePolygon )
{
//only drawing the line on the interior of the polygon, so set clip path for painter
p->save();
QPainterPath clipPath;
clipPath.addPolygon( points );
if ( rings != NULL )
{
//add polygon rings
QList<QPolygonF>::const_iterator it = rings->constBegin();
for ( ; it != rings->constEnd(); ++it )
{
QPolygonF ring = *it;
clipPath.addPolygon( ring );
}
}
//use intersect mode, as a clip path may already exist (eg, for composer maps)
p->setClipPath( clipPath, Qt::IntersectClip );
}
renderPolyline( points, context );
if ( rings )
{
foreach ( const QPolygonF& ring, *rings )
renderPolyline( ring, context );
}
if ( mDrawInsidePolygon )
{
//restore painter to reset clip path
p->restore();
}
}
void QgsSimpleLineSymbolLayerV2::renderPolyline( const QPolygonF& points, QgsSymbolV2RenderContext& context )
{
QPainter* p = context.renderContext().painter();
if ( !p )
{
return;
}
double offset = 0.0;
applyDataDefinedSymbology( context, mPen, mSelPen, offset );
p->setPen( context.selected() ? mSelPen : mPen );
// Disable 'Antialiasing' if the geometry was generalized in the current RenderContext (We known that it must have least #2 points).
if ( points.size() <= 2 && ( context.renderContext().vectorSimplifyMethod().simplifyHints() & QgsVectorSimplifyMethod::AntialiasingSimplification ) && QgsAbstractGeometrySimplifier::canbeGeneralizedByDeviceBoundingBox( points, context.renderContext().vectorSimplifyMethod().threshold() ) && ( p->renderHints() & QPainter::Antialiasing ) )
{
p->setRenderHint( QPainter::Antialiasing, false );
p->drawPolyline( points );
p->setRenderHint( QPainter::Antialiasing, true );
return;
}
if ( offset == 0 )
{
p->drawPolyline( points );
}
else
{
double scaledOffset = offset * QgsSymbolLayerV2Utils::lineWidthScaleFactor( context.renderContext(), mOffsetUnit, mOffsetMapUnitScale );
QList<QPolygonF> mline = ::offsetLine( points, scaledOffset );
for ( int part = 0; part < mline.count(); ++part )
p->drawPolyline( mline[ part ] );
}
}
QgsStringMap QgsSimpleLineSymbolLayerV2::properties() const
{
QgsStringMap map;
map["color"] = QgsSymbolLayerV2Utils::encodeColor( mColor );
map["width"] = QString::number( mWidth );
map["width_unit"] = QgsSymbolLayerV2Utils::encodeOutputUnit( mWidthUnit );
map["width_map_unit_scale"] = QgsSymbolLayerV2Utils::encodeMapUnitScale( mWidthMapUnitScale );
map["penstyle"] = QgsSymbolLayerV2Utils::encodePenStyle( mPenStyle );
map["joinstyle"] = QgsSymbolLayerV2Utils::encodePenJoinStyle( mPenJoinStyle );
map["capstyle"] = QgsSymbolLayerV2Utils::encodePenCapStyle( mPenCapStyle );
map["offset"] = QString::number( mOffset );
map["offset_unit"] = QgsSymbolLayerV2Utils::encodeOutputUnit( mOffsetUnit );
map["offset_map_unit_scale"] = QgsSymbolLayerV2Utils::encodeMapUnitScale( mOffsetMapUnitScale );
map["use_custom_dash"] = ( mUseCustomDashPattern ? "1" : "0" );
map["customdash"] = QgsSymbolLayerV2Utils::encodeRealVector( mCustomDashVector );
map["customdash_unit"] = QgsSymbolLayerV2Utils::encodeOutputUnit( mCustomDashPatternUnit );
map["customdash_map_unit_scale"] = QgsSymbolLayerV2Utils::encodeMapUnitScale( mCustomDashPatternMapUnitScale );
map["draw_inside_polygon"] = ( mDrawInsidePolygon ? "1" : "0" );
saveDataDefinedProperties( map );
return map;
}
QgsSymbolLayerV2* QgsSimpleLineSymbolLayerV2::clone() const
{
QgsSimpleLineSymbolLayerV2* l = new QgsSimpleLineSymbolLayerV2( mColor, mWidth, mPenStyle );
l->setWidthUnit( mWidthUnit );
l->setWidthMapUnitScale( mWidthMapUnitScale );
l->setOffsetUnit( mOffsetUnit );
l->setOffsetMapUnitScale( mOffsetMapUnitScale );
l->setCustomDashPatternUnit( mCustomDashPatternUnit );
l->setCustomDashPatternMapUnitScale( mCustomDashPatternMapUnitScale );
l->setOffset( mOffset );
l->setPenJoinStyle( mPenJoinStyle );
l->setPenCapStyle( mPenCapStyle );
l->setUseCustomDashPattern( mUseCustomDashPattern );
l->setCustomDashVector( mCustomDashVector );
l->setDrawInsidePolygon( mDrawInsidePolygon );
copyDataDefinedProperties( l );
return l;
}
void QgsSimpleLineSymbolLayerV2::toSld( QDomDocument &doc, QDomElement &element, QgsStringMap props ) const
{
if ( mPenStyle == Qt::NoPen )
return;
QDomElement symbolizerElem = doc.createElement( "se:LineSymbolizer" );
if ( !props.value( "uom", "" ).isEmpty() )
symbolizerElem.setAttribute( "uom", props.value( "uom", "" ) );
element.appendChild( symbolizerElem );
// <Geometry>
QgsSymbolLayerV2Utils::createGeometryElement( doc, symbolizerElem, props.value( "geom", "" ) );
// <Stroke>
QDomElement strokeElem = doc.createElement( "se:Stroke" );
symbolizerElem.appendChild( strokeElem );
Qt::PenStyle penStyle = mUseCustomDashPattern ? Qt::CustomDashLine : mPenStyle;
QgsSymbolLayerV2Utils::lineToSld( doc, strokeElem, penStyle, mColor, mWidth,
&mPenJoinStyle, &mPenCapStyle, &mCustomDashVector );
// <se:PerpendicularOffset>
if ( mOffset != 0 )
{
QDomElement perpOffsetElem = doc.createElement( "se:PerpendicularOffset" );
perpOffsetElem.appendChild( doc.createTextNode( QString::number( mOffset ) ) );
symbolizerElem.appendChild( perpOffsetElem );
}
}
QString QgsSimpleLineSymbolLayerV2::ogrFeatureStyle( double mmScaleFactor, double mapUnitScaleFactor ) const
{
if ( mUseCustomDashPattern )
{
return QgsSymbolLayerV2Utils::ogrFeatureStylePen( mWidth, mmScaleFactor, mapUnitScaleFactor,
mPen.color(), mPenJoinStyle,
mPenCapStyle, mOffset, &mCustomDashVector );
}
else
{
return QgsSymbolLayerV2Utils::ogrFeatureStylePen( mWidth, mmScaleFactor, mapUnitScaleFactor, mPen.color(), mPenJoinStyle,
mPenCapStyle, mOffset );
}
}
QgsSymbolLayerV2* QgsSimpleLineSymbolLayerV2::createFromSld( QDomElement &element )
{
QgsDebugMsg( "Entered." );
QDomElement strokeElem = element.firstChildElement( "Stroke" );
if ( strokeElem.isNull() )
return NULL;
Qt::PenStyle penStyle;
QColor color;
double width;
Qt::PenJoinStyle penJoinStyle;
Qt::PenCapStyle penCapStyle;
QVector<qreal> customDashVector;
if ( !QgsSymbolLayerV2Utils::lineFromSld( strokeElem, penStyle,
color, width,
&penJoinStyle, &penCapStyle,
&customDashVector ) )
return NULL;
double offset = 0.0;
QDomElement perpOffsetElem = element.firstChildElement( "PerpendicularOffset" );
if ( !perpOffsetElem.isNull() )
{
bool ok;
double d = perpOffsetElem.firstChild().nodeValue().toDouble( &ok );
if ( ok )
offset = d;
}
QgsSimpleLineSymbolLayerV2* l = new QgsSimpleLineSymbolLayerV2( color, width, penStyle );
l->setOffset( offset );
l->setPenJoinStyle( penJoinStyle );
l->setPenCapStyle( penCapStyle );
l->setUseCustomDashPattern( penStyle == Qt::CustomDashLine );
l->setCustomDashVector( customDashVector );
return l;
}
void QgsSimpleLineSymbolLayerV2::applyDataDefinedSymbology( QgsSymbolV2RenderContext& context, QPen& pen, QPen& selPen, double& offset )
{
//data defined properties
double scaledWidth = 0;
QgsExpression* strokeWidthExpression = expression( "width" );
if ( strokeWidthExpression )
{
scaledWidth = strokeWidthExpression->evaluate( const_cast<QgsFeature*>( context.feature() ) ).toDouble()
* QgsSymbolLayerV2Utils::lineWidthScaleFactor( context.renderContext(), mWidthUnit, mWidthMapUnitScale );
pen.setWidthF( scaledWidth );
selPen.setWidthF( scaledWidth );
}
else if ( context.renderHints() & QgsSymbolV2::DataDefinedSizeScale )
{
scaledWidth = mWidth * QgsSymbolLayerV2Utils::lineWidthScaleFactor( context.renderContext(), mWidthUnit, mWidthMapUnitScale );
pen.setWidthF( scaledWidth );
selPen.setWidthF( scaledWidth );
}
//color
QgsExpression* strokeColorExpression = expression( "color" );
if ( strokeColorExpression )
{
pen.setColor( QgsSymbolLayerV2Utils::decodeColor( strokeColorExpression->evaluate( const_cast<QgsFeature*>( context.feature() ) ).toString() ) );
}
//offset
offset = mOffset;
QgsExpression* lineOffsetExpression = expression( "offset" );
if ( lineOffsetExpression )
{
offset = lineOffsetExpression->evaluate( const_cast<QgsFeature*>( context.feature() ) ).toDouble();
}
//dash dot vector
QgsExpression* dashPatternExpression = expression( "customdash" );
if ( dashPatternExpression )
{
double scaledWidth = mWidth * QgsSymbolLayerV2Utils::lineWidthScaleFactor( context.renderContext(), mWidthUnit, mWidthMapUnitScale );
double dashWidthDiv = mPen.widthF();
//fix dash pattern width in Qt 4.8
QStringList versionSplit = QString( qVersion() ).split( "." );
if ( versionSplit.size() > 1
&& versionSplit.at( 1 ).toInt() >= 8
&& ( scaledWidth * context.renderContext().rasterScaleFactor() ) < 1.0 )
{
dashWidthDiv = 1.0;
}
QVector<qreal> dashVector;
QStringList dashList = dashPatternExpression->evaluate( const_cast<QgsFeature*>( context.feature() ) ).toString().split( ";" );
QStringList::const_iterator dashIt = dashList.constBegin();
for ( ; dashIt != dashList.constEnd(); ++dashIt )
{
dashVector.push_back( dashIt->toDouble() * QgsSymbolLayerV2Utils::lineWidthScaleFactor( context.renderContext(), mCustomDashPatternUnit, mCustomDashPatternMapUnitScale ) / dashWidthDiv );
}
pen.setDashPattern( dashVector );
}
//join style
QgsExpression* joinStyleExpression = expression( "joinstyle" );
if ( joinStyleExpression )
{
QString joinStyleString = joinStyleExpression->evaluate( const_cast<QgsFeature*>( context.feature() ) ).toString();
pen.setJoinStyle( QgsSymbolLayerV2Utils::decodePenJoinStyle( joinStyleString ) );
}
//cap style
QgsExpression* capStyleExpression = expression( "capstyle" );
if ( capStyleExpression )
{
QString capStyleString = capStyleExpression->evaluate( const_cast<QgsFeature*>( context.feature() ) ).toString();
pen.setCapStyle( QgsSymbolLayerV2Utils::decodePenCapStyle( capStyleString ) );
}
}
double QgsSimpleLineSymbolLayerV2::estimateMaxBleed() const
{
if ( mDrawInsidePolygon )
{
//set to clip line to the interior of polygon, so we expect no bleed
return 0;
}
else
{
return ( mWidth / 2.0 ) + mOffset;
}
}
QVector<qreal> QgsSimpleLineSymbolLayerV2::dxfCustomDashPattern( QgsSymbolV2::OutputUnit& unit ) const
{
unit = mCustomDashPatternUnit;
return mUseCustomDashPattern ? mCustomDashVector : QVector<qreal>() ;
}
Qt::PenStyle QgsSimpleLineSymbolLayerV2::dxfPenStyle() const
{
return mPenStyle;
}
double QgsSimpleLineSymbolLayerV2::dxfWidth( const QgsDxfExport& e, const QgsSymbolV2RenderContext& context ) const
{
double width = mWidth;
QgsExpression* strokeWidthExpression = expression( "width" );
if ( strokeWidthExpression )
{
width = strokeWidthExpression->evaluate( const_cast<QgsFeature*>( context.feature() ) ).toDouble() * e.mapUnitScaleFactor( e.symbologyScaleDenominator(), widthUnit(), e.mapUnits() );
}
else if ( context.renderHints() & QgsSymbolV2::DataDefinedSizeScale )
{
width = mWidth * QgsSymbolLayerV2Utils::lineWidthScaleFactor( context.renderContext(), mWidthUnit, mWidthMapUnitScale );
}
return width * e.mapUnitScaleFactor( e.symbologyScaleDenominator(), widthUnit(), e.mapUnits() );
}
QColor QgsSimpleLineSymbolLayerV2::dxfColor( const QgsSymbolV2RenderContext& context ) const
{
QgsExpression* strokeColorExpression = expression( "color" );
if ( strokeColorExpression )
{
return ( QgsSymbolLayerV2Utils::decodeColor( strokeColorExpression->evaluate( const_cast<QgsFeature*>( context.feature() ) ).toString() ) );
}
return mColor;
}
/////////
class MyLine
{
public:
MyLine( QPointF p1, QPointF p2 ) : mVertical( false ), mIncreasing( false ), mT( 0.0 ), mLength( 0.0 )
{
if ( p1 == p2 )
return; // invalid
// tangent and direction
if ( p1.x() == p2.x() )
{
// vertical line - tangent undefined
mVertical = true;
mIncreasing = ( p2.y() > p1.y() );
}
else
{
mVertical = false;
mT = float( p2.y() - p1.y() ) / ( p2.x() - p1.x() );
mIncreasing = ( p2.x() > p1.x() );
}
// length
double x = ( p2.x() - p1.x() );
double y = ( p2.y() - p1.y() );
mLength = sqrt( x * x + y * y );
}
// return angle in radians
double angle()
{
double a = ( mVertical ? M_PI / 2 : atan( mT ) );
if ( !mIncreasing )
a += M_PI;
return a;
}
// return difference for x,y when going along the line with specified interval
QPointF diffForInterval( double interval )
{
if ( mVertical )
return ( mIncreasing ? QPointF( 0, interval ) : QPointF( 0, -interval ) );
double alpha = atan( mT );
double dx = cos( alpha ) * interval;
double dy = sin( alpha ) * interval;
return ( mIncreasing ? QPointF( dx, dy ) : QPointF( -dx, -dy ) );
}
double length() { return mLength; }
protected:
bool mVertical;
bool mIncreasing;
double mT;
double mLength;
};
QgsMarkerLineSymbolLayerV2::QgsMarkerLineSymbolLayerV2( bool rotateMarker, double interval )
{
mRotateMarker = rotateMarker;
mInterval = interval;
mIntervalUnit = QgsSymbolV2::MM;
mMarker = NULL;
mOffset = 0;
mOffsetUnit = QgsSymbolV2::MM;
mPlacement = Interval;
mOffsetAlongLine = 0;
mOffsetAlongLineUnit = QgsSymbolV2::MM;
setSubSymbol( new QgsMarkerSymbolV2() );
}
QgsMarkerLineSymbolLayerV2::~QgsMarkerLineSymbolLayerV2()
{
delete mMarker;
}
QgsSymbolLayerV2* QgsMarkerLineSymbolLayerV2::create( const QgsStringMap& props )
{
bool rotate = DEFAULT_MARKERLINE_ROTATE;
double interval = DEFAULT_MARKERLINE_INTERVAL;
if ( props.contains( "interval" ) )
interval = props["interval"].toDouble();
if ( props.contains( "rotate" ) )
rotate = ( props["rotate"] == "1" );
QgsMarkerLineSymbolLayerV2* x = new QgsMarkerLineSymbolLayerV2( rotate, interval );
if ( props.contains( "offset" ) )
{
x->setOffset( props["offset"].toDouble() );
}
if ( props.contains( "offset_unit" ) )
{
x->setOffsetUnit( QgsSymbolLayerV2Utils::decodeOutputUnit( props["offset_unit"] ) );
}
if ( props.contains( "interval_unit" ) )
{
x->setIntervalUnit( QgsSymbolLayerV2Utils::decodeOutputUnit( props["interval_unit"] ) );
}
if ( props.contains( "offset_along_line" ) )
{
x->setOffsetAlongLine( props["offset_along_line"].toDouble() );
}
if ( props.contains( "offset_along_line_unit" ) )
{
x->setOffsetAlongLineUnit( QgsSymbolLayerV2Utils::decodeOutputUnit( props["offset_along_line_unit"] ) );
}
if ( props.contains(( "offset_along_line_map_unit_scale" ) ) )
{
x->setOffsetAlongLineMapUnitScale( QgsSymbolLayerV2Utils::decodeMapUnitScale( props["offset_along_line_map_unit_scale"] ) );
}
if ( props.contains( "offset_map_unit_scale" ) )
{
x->setOffsetMapUnitScale( QgsSymbolLayerV2Utils::decodeMapUnitScale( props["offset_map_unit_scale"] ) );
}
if ( props.contains( "interval_map_unit_scale" ) )
{
x->setIntervalMapUnitScale( QgsSymbolLayerV2Utils::decodeMapUnitScale( props["interval_map_unit_scale"] ) );
}
if ( props.contains( "placement" ) )
{
if ( props["placement"] == "vertex" )
x->setPlacement( Vertex );
else if ( props["placement"] == "lastvertex" )
x->setPlacement( LastVertex );
else if ( props["placement"] == "firstvertex" )
x->setPlacement( FirstVertex );
else if ( props["placement"] == "centralpoint" )
x->setPlacement( CentralPoint );
else
x->setPlacement( Interval );
}
//data defined properties
if ( props.contains( "interval_expression" ) )
{
x->setDataDefinedProperty( "interval", props["interval_expression"] );
}
if ( props.contains( "offset_expression" ) )
{
x->setDataDefinedProperty( "offset", props["offset_expression"] );
}
if ( props.contains( "placement_expression" ) )
{
x->setDataDefinedProperty( "placement", props["placement_expression"] );
}
if ( props.contains( "offset_along_line_expression" ) )
{
x->setDataDefinedProperty( "offset_along_line", props["offset_along_line_expression"] );
}
return x;
}
QString QgsMarkerLineSymbolLayerV2::layerType() const
{
return "MarkerLine";
}
void QgsMarkerLineSymbolLayerV2::setColor( const QColor& color )
{
mMarker->setColor( color );
mColor = color;
}
void QgsMarkerLineSymbolLayerV2::startRender( QgsSymbolV2RenderContext& context )
{
mMarker->setAlpha( context.alpha() );
// if being rotated, it gets initialized with every line segment
int hints = 0;
if ( mRotateMarker )
hints |= QgsSymbolV2::DataDefinedRotation;
if ( context.renderHints() & QgsSymbolV2::DataDefinedSizeScale )
hints |= QgsSymbolV2::DataDefinedSizeScale;
mMarker->setRenderHints( hints );
mMarker->startRender( context.renderContext(), context.fields() );
//prepare expressions for data defined properties
prepareExpressions( context.fields(), context.renderContext().rendererScale() );
}
void QgsMarkerLineSymbolLayerV2::stopRender( QgsSymbolV2RenderContext& context )
{
mMarker->stopRender( context.renderContext() );
}
void QgsMarkerLineSymbolLayerV2::renderPolyline( const QPolygonF& points, QgsSymbolV2RenderContext& context )
{
double offset = mOffset;
QgsExpression* offsetExpression = expression( "offset" );
if ( offsetExpression )
{
offset = offsetExpression->evaluate( const_cast<QgsFeature*>( context.feature() ) ).toDouble();
}
Placement placement = mPlacement;
QgsExpression* placementExpression = expression( "placement" );
if ( placementExpression )
{
QString placementString = placementExpression->evaluate( const_cast<QgsFeature*>( context.feature() ) ).toString();
if ( placementString.compare( "vertex", Qt::CaseInsensitive ) == 0 )
{
placement = Vertex;
}
else if ( placementString.compare( "lastvertex", Qt::CaseInsensitive ) == 0 )
{
placement = LastVertex;
}
else if ( placementString.compare( "firstvertex", Qt::CaseInsensitive ) == 0 )
{
placement = FirstVertex;
}
else if ( placementString.compare( "centerpoint", Qt::CaseInsensitive ) == 0 )
{
placement = CentralPoint;
}
else
{
placement = Interval;
}
}
if ( offset == 0 )
{
if ( placement == Interval )
renderPolylineInterval( points, context );
else if ( placement == CentralPoint )
renderPolylineCentral( points, context );
else
renderPolylineVertex( points, context, placement );
}
else
{
QList<QPolygonF> mline = ::offsetLine( points, offset * QgsSymbolLayerV2Utils::lineWidthScaleFactor( context.renderContext(), mOffsetUnit, mOffsetMapUnitScale ) );
for ( int part = 0; part < mline.count(); ++part )
{
const QPolygonF &points2 = mline[ part ];
if ( placement == Interval )
renderPolylineInterval( points2, context );
else if ( placement == CentralPoint )
renderPolylineCentral( points2, context );
else
renderPolylineVertex( points2, context, placement );
}
}
}
void QgsMarkerLineSymbolLayerV2::renderPolylineInterval( const QPolygonF& points, QgsSymbolV2RenderContext& context )
{
if ( points.isEmpty() )
return;
QPointF lastPt = points[0];
double lengthLeft = 0; // how much is left until next marker
bool first = mOffsetAlongLine ? false : true; //only draw marker at first vertex when no offset along line is set
double origAngle = mMarker->angle();
QgsRenderContext& rc = context.renderContext();
double interval = mInterval;
QgsExpression* intervalExpression = expression( "interval" );
if ( intervalExpression )
{
interval = intervalExpression->evaluate( const_cast<QgsFeature*>( context.feature() ) ).toDouble();
}
if ( interval <= 0 )
{
interval = 0.1;
}
double offsetAlongLine = mOffsetAlongLine;
QgsExpression* offsetAlongLineExpression = expression( "offset_along_line" );
if ( offsetAlongLineExpression )
{
offsetAlongLine = offsetAlongLineExpression->evaluate( const_cast<QgsFeature*>( context.feature() ) ).toDouble();
}
double painterUnitInterval = interval * QgsSymbolLayerV2Utils::lineWidthScaleFactor( rc, mIntervalUnit, mIntervalMapUnitScale );
lengthLeft = painterUnitInterval - offsetAlongLine * QgsSymbolLayerV2Utils::lineWidthScaleFactor( rc, mIntervalUnit, mIntervalMapUnitScale );
for ( int i = 1; i < points.count(); ++i )
{
const QPointF& pt = points[i];
if ( lastPt == pt ) // must not be equal!
continue;
// for each line, find out dx and dy, and length
MyLine l( lastPt, pt );
QPointF diff = l.diffForInterval( painterUnitInterval );
// if there's some length left from previous line
// use only the rest for the first point in new line segment
double c = 1 - lengthLeft / painterUnitInterval;
lengthLeft += l.length();
// rotate marker (if desired)
if ( mRotateMarker )
{
mMarker->setAngle( origAngle + ( l.angle() * 180 / M_PI ) );
}
// draw first marker
if ( first )
{
mMarker->renderPoint( lastPt, context.feature(), rc, -1, context.selected() );
first = false;
}
// while we're not at the end of line segment, draw!
while ( lengthLeft > painterUnitInterval )
{
// "c" is 1 for regular point or in interval (0,1] for begin of line segment
lastPt += c * diff;
lengthLeft -= painterUnitInterval;
mMarker->renderPoint( lastPt, context.feature(), rc, -1, context.selected() );
c = 1; // reset c (if wasn't 1 already)
}
lastPt = pt;
}
// restore original rotation
mMarker->setAngle( origAngle );
}
static double _averageAngle( const QPointF& prevPt, const QPointF& pt, const QPointF& nextPt )
{
// calc average angle between the previous and next point
double a1 = MyLine( prevPt, pt ).angle();
double a2 = MyLine( pt, nextPt ).angle();
double unitX = cos( a1 ) + cos( a2 ), unitY = sin( a1 ) + sin( a2 );
return atan2( unitY, unitX );
}
void QgsMarkerLineSymbolLayerV2::renderPolylineVertex( const QPolygonF& points, QgsSymbolV2RenderContext& context, Placement placement )
{
if ( points.isEmpty() )
return;
QgsRenderContext& rc = context.renderContext();
double origAngle = mMarker->angle();
int i, maxCount;
bool isRing = false;
double offsetAlongLine = mOffsetAlongLine;
QgsExpression* offsetAlongLineExpression = expression( "offset_along_line" );
if ( offsetAlongLineExpression )
{
offsetAlongLine = offsetAlongLineExpression->evaluate( const_cast<QgsFeature*>( context.feature() ) ).toDouble();
}
if ( offsetAlongLine != 0 )
{
//scale offset along line
offsetAlongLine *= QgsSymbolLayerV2Utils::lineWidthScaleFactor( rc, mOffsetAlongLineUnit, mOffsetAlongLineMapUnitScale );
}
if ( placement == FirstVertex )
{
i = 0;
maxCount = 1;
}
else if ( placement == LastVertex )
{
i = points.count() - 1;
maxCount = points.count();
}
else
{
i = 0;
maxCount = points.count();
if ( points.first() == points.last() )
isRing = true;
}
if ( offsetAlongLine > 0 && ( placement == FirstVertex || placement == LastVertex ) )
{
double distance;
distance = placement == FirstVertex ? offsetAlongLine : -offsetAlongLine;
renderOffsetVertexAlongLine( points, i, distance, context );
// restore original rotation
mMarker->setAngle( origAngle );
return;
}
for ( ; i < maxCount; ++i )
{
if ( isRing && placement == Vertex && i == points.count() - 1 )
{
continue; // don't draw the last marker - it has been drawn already
}
// rotate marker (if desired)
if ( mRotateMarker )
{
double angle = markerAngle( points, isRing, i );
mMarker->setAngle( origAngle + angle * 180 / M_PI );
}
mMarker->renderPoint( points.at( i ), context.feature(), rc, -1, context.selected() );
}
// restore original rotation
mMarker->setAngle( origAngle );
}
double QgsMarkerLineSymbolLayerV2::markerAngle( const QPolygonF& points, bool isRing, int vertex )
{
double angle = 0;
const QPointF& pt = points[vertex];
if ( isRing || ( vertex > 0 && vertex < points.count() - 1 ) )
{
int prevIndex = vertex - 1;
int nextIndex = vertex + 1;
if ( isRing && ( vertex == 0 || vertex == points.count() - 1 ) )
{
prevIndex = points.count() - 2;
nextIndex = 1;
}
QPointF prevPoint, nextPoint;
while ( prevIndex >= 0 )
{
prevPoint = points[ prevIndex ];
if ( prevPoint != pt )
{
break;
}
--prevIndex;
}
while ( nextIndex < points.count() )
{
nextPoint = points[ nextIndex ];
if ( nextPoint != pt )
{
break;
}
++nextIndex;
}
if ( prevIndex >= 0 && nextIndex < points.count() )
{
angle = _averageAngle( prevPoint, pt, nextPoint );
}
}