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qgshighlight.cpp
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qgshighlight.cpp
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/***************************************************************************
qgshighlight.cpp - widget to highlight features on the map
--------------------------------------
Date : 02-03-2011
Copyright : (C) 2011 by Juergen E. Fischer, norBIT GmbH
Email : jef at norbit dot de
***************************************************************************
* *
* 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 <QImage>
#include "qgsmarkersymbollayer.h"
#include "qgslinesymbollayer.h"
#include "qgscoordinatetransform.h"
#include "qgsfillsymbollayer.h"
#include "qgsgeometry.h"
#include "qgshighlight.h"
#include "qgsmapcanvas.h"
#include "qgsmaplayer.h"
#include "qgsrendercontext.h"
#include "qgssymbollayer.h"
#include "qgssymbol.h"
#include "qgsvectorlayer.h"
#include "qgsrenderer.h"
/* Few notes about highlighting (RB):
- The highlight fill must always be partially transparent because above highlighted layer
may be another layer which must remain partially visible.
- Because single highlight color does not work well with layers using similar layer color
there were considered various possibilities but no optimal solution was found.
What does not work:
- lighter/darker color: it would work more or less for fully opaque highlight, but
overlaying transparent lighter color over original has small visual effect.
- complemetary color: mixing transparent (128) complement color with original color
results in grey for all colors
- contrast line style/ fill pattern: impression is not highligh but just different style
- line buffer with contrast (or 2 contrast) color: the same as with patterns, no highlight impression
- fill with highlight or contrast color but opaque and using pattern
(e.g. Qt::Dense7Pattern): again no highlight impression
*/
QgsHighlight::QgsHighlight( QgsMapCanvas *mapCanvas, const QgsGeometry &geom, QgsMapLayer *layer )
: QgsMapCanvasItem( mapCanvas )
, mLayer( layer )
, mBuffer( 0 )
, mMinWidth( 0 )
{
mGeometry = !geom.isNull() ? new QgsGeometry( geom ) : nullptr;
init();
}
QgsHighlight::QgsHighlight( QgsMapCanvas *mapCanvas, const QgsGeometry &geom, QgsVectorLayer *layer )
: QgsMapCanvasItem( mapCanvas )
, mLayer( static_cast<QgsMapLayer *>( layer ) )
, mBuffer( 0 )
, mMinWidth( 0 )
{
mGeometry = !geom.isNull() ? new QgsGeometry( geom ) : nullptr;
init();
}
QgsHighlight::QgsHighlight( QgsMapCanvas *mapCanvas, const QgsFeature &feature, QgsVectorLayer *layer )
: QgsMapCanvasItem( mapCanvas )
, mLayer( static_cast<QgsMapLayer *>( layer ) )
, mFeature( feature )
, mBuffer( 0 )
, mMinWidth( 0 )
{
init();
}
void QgsHighlight::init()
{
QgsCoordinateTransform ct = mMapCanvas->mapSettings().layerTransform( mLayer );
if ( ct.isValid() )
{
if ( mGeometry )
{
mGeometry->transform( ct );
}
else if ( mFeature.hasGeometry() )
{
QgsGeometry g = mFeature.geometry();
g.transform( ct );
mFeature.setGeometry( g );
}
}
updateRect();
update();
setColor( QColor( Qt::lightGray ) );
}
QgsHighlight::~QgsHighlight()
{
delete mGeometry;
}
void QgsHighlight::setColor( const QColor &color )
{
mPen.setColor( color );
QColor fillColor( color.red(), color.green(), color.blue(), 63 );
mBrush.setColor( fillColor );
mBrush.setStyle( Qt::SolidPattern );
}
void QgsHighlight::setFillColor( const QColor &fillColor )
{
mBrush.setColor( fillColor );
mBrush.setStyle( Qt::SolidPattern );
}
QgsFeatureRenderer *QgsHighlight::getRenderer( QgsRenderContext &context, const QColor &color, const QColor &fillColor )
{
QgsFeatureRenderer *renderer = nullptr;
QgsVectorLayer *layer = qobject_cast<QgsVectorLayer *>( mLayer );
if ( layer && layer->renderer() )
{
renderer = layer->renderer()->clone();
}
if ( renderer )
{
Q_FOREACH ( QgsSymbol *symbol, renderer->symbols( context ) )
{
if ( !symbol ) continue;
setSymbol( symbol, context, color, fillColor );
}
}
return renderer;
}
void QgsHighlight::setSymbol( QgsSymbol *symbol, const QgsRenderContext &context, const QColor &color, const QColor &fillColor )
{
if ( !symbol ) return;
for ( int i = symbol->symbolLayerCount() - 1; i >= 0; i-- )
{
QgsSymbolLayer *symbolLayer = symbol->symbolLayer( i );
if ( !symbolLayer ) continue;
if ( symbolLayer->subSymbol() )
{
setSymbol( symbolLayer->subSymbol(), context, color, fillColor );
}
else
{
symbolLayer->setColor( color ); // line symbology layers
symbolLayer->setStrokeColor( color ); // marker and fill symbology layers
symbolLayer->setFillColor( fillColor ); // marker and fill symbology layers
// Data defined widths overwrite what we set here (widths do not work with data defined)
QgsSimpleMarkerSymbolLayer *simpleMarker = dynamic_cast<QgsSimpleMarkerSymbolLayer *>( symbolLayer );
if ( simpleMarker )
{
simpleMarker->setStrokeWidth( getSymbolWidth( context, simpleMarker->strokeWidth(), simpleMarker->strokeWidthUnit() ) );
}
QgsSimpleLineSymbolLayer *simpleLine = dynamic_cast<QgsSimpleLineSymbolLayer *>( symbolLayer );
if ( simpleLine )
{
simpleLine->setWidth( getSymbolWidth( context, simpleLine->width(), simpleLine->widthUnit() ) );
}
QgsSimpleFillSymbolLayer *simpleFill = dynamic_cast<QgsSimpleFillSymbolLayer *>( symbolLayer );
if ( simpleFill )
{
simpleFill->setStrokeWidth( getSymbolWidth( context, simpleFill->strokeWidth(), simpleFill->outputUnit() ) );
}
symbolLayer->setDataDefinedProperty( QgsSymbolLayer::PropertyFillColor, QgsProperty() );
symbolLayer->setDataDefinedProperty( QgsSymbolLayer::PropertyStrokeColor, QgsProperty() );
}
}
}
double QgsHighlight::getSymbolWidth( const QgsRenderContext &context, double width, QgsUnitTypes::RenderUnit unit )
{
// if necessary scale mm to map units
double scale = 1.;
if ( unit == QgsUnitTypes::RenderMapUnits )
{
scale = context.convertToPainterUnits( 1, QgsUnitTypes::RenderMillimeters ) / context.convertToPainterUnits( 1, QgsUnitTypes::RenderMapUnits );
}
width = std::max( width + 2 * mBuffer * scale, mMinWidth * scale );
return width;
}
void QgsHighlight::setWidth( int width )
{
mPen.setWidth( width );
}
void QgsHighlight::paintPoint( QPainter *p, const QgsPointXY &point )
{
QPolygonF r( 5 );
double d = mMapCanvas->extent().width() * 0.005;
r[0] = toCanvasCoordinates( point + QgsVector( -d, -d ) ) - pos();
r[1] = toCanvasCoordinates( point + QgsVector( d, -d ) ) - pos();
r[2] = toCanvasCoordinates( point + QgsVector( d, d ) ) - pos();
r[3] = toCanvasCoordinates( point + QgsVector( -d, d ) ) - pos();
r[4] = r[0];
p->drawPolygon( r );
}
void QgsHighlight::paintLine( QPainter *p, QgsPolylineXY line )
{
QPolygonF polygon( line.size() );
for ( int i = 0; i < line.size(); i++ )
{
polygon[i] = toCanvasCoordinates( line[i] ) - pos();
}
p->drawPolyline( polygon );
}
void QgsHighlight::paintPolygon( QPainter *p, const QgsPolygonXY &polygon )
{
// OddEven fill rule by default
QPainterPath path;
p->setPen( mPen );
p->setBrush( mBrush );
for ( const auto &sourceRing : polygon )
{
if ( sourceRing.empty() )
continue;
QPolygonF ring;
ring.reserve( sourceRing.size() + 1 );
QPointF lastVertex;
for ( const auto &sourceVertex : sourceRing )
{
//adding point only if it is more than a pixel apart from the previous one
const QPointF curVertex = toCanvasCoordinates( sourceVertex ) - pos();
if ( ring.isEmpty() || std::abs( ring.back().x() - curVertex.x() ) > 1 || std::abs( ring.back().y() - curVertex.y() ) > 1 )
{
ring.push_back( curVertex );
}
lastVertex = curVertex;
}
ring.push_back( ring.at( 0 ) );
path.addPolygon( ring );
}
p->drawPath( path );
}
void QgsHighlight::updatePosition()
{
if ( isVisible() ) updateRect();
}
void QgsHighlight::paint( QPainter *p )
{
if ( mGeometry )
{
p->setPen( mPen );
p->setBrush( mBrush );
switch ( mGeometry->type() )
{
case QgsWkbTypes::PointGeometry:
{
if ( !mGeometry->isMultipart() )
{
paintPoint( p, mGeometry->asPoint() );
}
else
{
QgsMultiPointXY m = mGeometry->asMultiPoint();
for ( int i = 0; i < m.size(); i++ )
{
paintPoint( p, m[i] );
}
}
}
break;
case QgsWkbTypes::LineGeometry:
{
if ( !mGeometry->isMultipart() )
{
paintLine( p, mGeometry->asPolyline() );
}
else
{
QgsMultiPolylineXY m = mGeometry->asMultiPolyline();
for ( int i = 0; i < m.size(); i++ )
{
paintLine( p, m[i] );
}
}
break;
}
case QgsWkbTypes::PolygonGeometry:
{
if ( !mGeometry->isMultipart() )
{
paintPolygon( p, mGeometry->asPolygon() );
}
else
{
QgsMultiPolygonXY m = mGeometry->asMultiPolygon();
for ( int i = 0; i < m.size(); i++ )
{
paintPolygon( p, m[i] );
}
}
break;
}
case QgsWkbTypes::UnknownGeometry:
case QgsWkbTypes::NullGeometry:
return;
}
}
else if ( mFeature.hasGeometry() )
{
QgsVectorLayer *layer = qobject_cast<QgsVectorLayer *>( mLayer );
if ( !layer )
return;
QgsMapSettings mapSettings = mMapCanvas->mapSettings();
QgsRenderContext context = QgsRenderContext::fromMapSettings( mapSettings );
// Because lower level outlines must be covered by upper level fill color
// we render first with temporary opaque color, which is then replaced
// by final transparent fill color.
QColor tmpColor( 255, 0, 0, 255 );
QColor tmpFillColor( 0, 255, 0, 255 );
QgsFeatureRenderer *renderer = getRenderer( context, tmpColor, tmpFillColor );
if ( layer && renderer )
{
QSize imageSize( mMapCanvas->mapSettings().outputSize() );
QImage image = QImage( imageSize.width(), imageSize.height(), QImage::Format_ARGB32 );
image.fill( 0 );
QPainter *imagePainter = new QPainter( &image );
imagePainter->setRenderHint( QPainter::Antialiasing, true );
context.setPainter( imagePainter );
renderer->startRender( context, layer->fields() );
renderer->renderFeature( mFeature, context );
renderer->stopRender( context );
imagePainter->end();
QColor color( mPen.color() ); // true output color
// coefficient to subtract alpha using green (temporary fill)
double k = ( 255. - mBrush.color().alpha() ) / 255.;
for ( int r = 0; r < image.height(); r++ )
{
for ( int c = 0; c < image.width(); c++ )
{
QRgb rgba = image.pixel( c, r );
int alpha = qAlpha( rgba );
if ( alpha > 0 )
{
int green = qGreen( rgba );
color.setAlpha( qBound<int>( 0, alpha - ( green * k ), 255 ) );
image.setPixel( c, r, color.rgba() );
}
}
}
p->drawImage( 0, 0, image );
delete imagePainter;
delete renderer;
}
}
}
void QgsHighlight::updateRect()
{
if ( mGeometry )
{
QgsRectangle r = mGeometry->boundingBox();
if ( r.isEmpty() )
{
double d = mMapCanvas->extent().width() * 0.005;
r.setXMinimum( r.xMinimum() - d );
r.setYMinimum( r.yMinimum() - d );
r.setXMaximum( r.xMaximum() + d );
r.setYMaximum( r.yMaximum() + d );
}
setRect( r );
setVisible( mGeometry );
}
else if ( mFeature.hasGeometry() )
{
// We are currently using full map canvas extent for two reasons:
// 1) currently there is no method in QgsFeatureRenderer to get rendered feature
// bounding box
// 2) using different extent would result in shifted fill patterns
// This is an hack to pass QgsMapCanvasItem::setRect what it
// expects (encoding of position and size of the item)
const QgsMapToPixel &m2p = mMapCanvas->mapSettings().mapToPixel();
QgsPointXY topLeft = m2p.toMapPoint( 0, 0 );
double res = m2p.mapUnitsPerPixel();
QSizeF imageSize = mMapCanvas->mapSettings().outputSize();
QgsRectangle rect( topLeft.x(), topLeft.y(), topLeft.x() + imageSize.width()*res, topLeft.y() - imageSize.height()*res );
setRect( rect );
setVisible( true );
}
else
{
setRect( QgsRectangle() );
}
}