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qgsmapoverviewcanvas.cpp
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qgsmapoverviewcanvas.cpp
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/***************************************************************************
qgsmapoverviewcanvas.cpp
Map canvas subclassed for overview
-------------------
begin : 09/14/2005
copyright : (C) 2005 by Martin Dobias
email : won.der at centrum.sk
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
/* $Id$ */
#include "qgsmapcanvas.h"
#include "qgsmaprenderer.h"
#include "qgsmapoverviewcanvas.h"
#include "qgsmaptopixel.h"
#include <QPainter>
#include <QPaintEvent>
#include <QResizeEvent>
#include <QMouseEvent>
#include "qgslogger.h"
#include <limits.h>
//! widget that serves as rectangle showing current extent in overview
class QgsPanningWidget : public QWidget
{
public:
QgsPanningWidget( QWidget* parent )
: QWidget( parent )
{
setObjectName( "panningWidget" );
setMinimumSize( 5, 5 );
setAttribute( Qt::WA_NoSystemBackground );
}
void resizeEvent( QResizeEvent* r )
{
QSize s = r->size();
QRegion reg( 0, 0, s.width(), s.height() );
QRegion reg2( 2, 2, s.width() - 4, s.height() - 4 );
QRegion reg3 = reg.subtract( reg2 );
setMask( reg3 );
}
void paintEvent( QPaintEvent* pe )
{
QRect r( QPoint( 0, 0 ), size() );
QPainter p;
p.begin( this );
p.setPen( Qt::red );
p.setBrush( Qt::red );
p.drawRect( r );
p.end();
}
};
QgsMapOverviewCanvas::QgsMapOverviewCanvas( QWidget * parent, QgsMapCanvas* mapCanvas )
: QWidget( parent ), mMapCanvas( mapCanvas )
{
setObjectName( "theOverviewCanvas" );
mPanningWidget = new QgsPanningWidget( this );
mMapRenderer = new QgsMapRenderer;
mMapRenderer->enableOverviewMode();
setBackgroundColor( palette().window().color() );
}
QgsMapOverviewCanvas::~QgsMapOverviewCanvas()
{
delete mMapRenderer;
}
void QgsMapOverviewCanvas::resizeEvent( QResizeEvent* e )
{
mPixmap = QPixmap( e->size() );
mMapRenderer->setOutputSize( e->size(), mPixmap.logicalDpiX() );
refresh();
}
void QgsMapOverviewCanvas::drawExtentRect()
{
const QgsRectangle& extent = mMapCanvas->extent();
// show only when valid extent is set
if ( extent.isEmpty() )
{
mPanningWidget->hide();
return;
}
const QgsMapToPixel* cXf = mMapRenderer->coordinateTransform();
QgsPoint ll( extent.xMinimum(), extent.yMinimum() );
QgsPoint ur( extent.xMaximum(), extent.yMaximum() );
if ( cXf )
{
// transform the points before drawing
cXf->transform( &ll );
cXf->transform( &ur );
}
#if 0
// test whether panning widget should be drawn
bool show = false;
if ( ur.x() >= 0 && ur.x() < width() ) show = true;
if ( ll.x() >= 0 && ll.x() < width() ) show = true;
if ( ur.y() >= 0 && ur.y() < height() ) show = true;
if ( ll.y() >= 0 && ll.y() < height() ) show = true;
if ( !show )
{
QgsDebugMsg( "panning: extent out of overview area" );
mPanningWidget->hide();
return;
}
#endif
// round values
int x1 = static_cast<int>( ur.x() + 0.5 ), x2 = static_cast<int>( ll.x() + 0.5 );
int y1 = static_cast<int>( ur.y() + 0.5 ), y2 = static_cast<int>( ll.y() + 0.5 );
if ( x1 > x2 )
std::swap( x1, x2 );
if ( y1 > y2 )
std::swap( y1, y2 );
#ifdef Q_WS_MAC
// setGeometry (Qt 4.2) is causing Mac window corruption (decorations
// are drawn at odd locations) if both coords are at limit. This may
// have something to do with Qt calculating dimensions as x2 - x1 + 1.
// (INT_MAX - INT_MIN + 1 is UINT_MAX + 1)
if ( x1 == INT_MIN && x2 == INT_MAX ) x1 += 1; // x2 -= 1 works too
if ( y1 == INT_MIN && y2 == INT_MAX ) y1 += 1;
#endif
QRect r( x1, y1, x2 - x1 + 1, y2 - y1 + 1 );
// allow for 5 pixel minimum widget size
if ( r.width() < 5 && x1 > INT_MIN + 2 ) // make sure no underflow occurs (2 is largest adjustment)
{
r.setX( r.x() - ( ( 5 - r.width() ) / 2 ) ); // adjust x by 1/2 the difference of calculated and min. width
r.setWidth(5);
}
if ( r.height() < 5 && y1 > INT_MIN + 2 )
{
r.setY( r.y() - ( ( 5 - r.height() ) / 2 ) ); // adjust y
r.setHeight(5);
}
QgsDebugMsg( QString( "panning: extent to widget: [%1,%2] [%3x%4]" ).arg( x1 ).arg( y1 ).arg( r.width() ).arg( r.height() ) );
mPanningWidget->setGeometry( r );
mPanningWidget->show(); // show if hidden
}
void QgsMapOverviewCanvas::mousePressEvent( QMouseEvent * e )
{
// if (mPanningWidget->isHidden())
// return;
// set offset in panning widget if inside it
// for better experience with panning :)
if ( mPanningWidget->geometry().contains( e->pos() ) )
{
mPanningCursorOffset = e->pos() - mPanningWidget->pos();
}
else
{
// use center of the panning widget if outside
QSize s = mPanningWidget->size();
mPanningCursorOffset = QPoint( s.width() / 2, s.height() / 2 );
}
updatePanningWidget( e->pos() );
}
void QgsMapOverviewCanvas::mouseReleaseEvent( QMouseEvent * e )
{
// if (mPanningWidget->isHidden())
// return;
if ( e->button() == Qt::LeftButton )
{
// set new extent
const QgsMapToPixel* cXf = mMapRenderer->coordinateTransform();
QRect rect = mPanningWidget->geometry();
QgsPoint center = cXf->toMapCoordinates( rect.center() );
QgsRectangle oldExtent = mMapCanvas->extent();
QgsRectangle ext;
ext.setXMinimum( center.x() - oldExtent.width() / 2 );
ext.setXMaximum( center.x() + oldExtent.width() / 2 );
ext.setYMinimum( center.y() - oldExtent.height() / 2 );
ext.setYMaximum( center.y() + oldExtent.height() / 2 );
QgsDebugMsg( QString( "panning: new position: [%1,%2] [%3x%4]" ).arg( rect.left() ).arg( rect.top() ).arg( rect.width() ).arg( rect.height() ) );
mMapCanvas->setExtent( ext );
mMapCanvas->refresh();
}
}
void QgsMapOverviewCanvas::mouseMoveEvent( QMouseEvent * e )
{
// move with panning widget if tracking cursor
if (( e->buttons() & Qt::LeftButton ) == Qt::LeftButton )
{
updatePanningWidget( e->pos() );
}
}
void QgsMapOverviewCanvas::updatePanningWidget( const QPoint& pos )
{
// if (mPanningWidget->isHidden())
// return;
QSize size = mPanningWidget->size();
mPanningWidget->move( pos.x() - mPanningCursorOffset.x(), pos.y() - mPanningCursorOffset.y() );
}
void QgsMapOverviewCanvas::paintEvent( QPaintEvent * pe )
{
QPainter paint( this );
paint.drawPixmap( pe->rect().topLeft(), mPixmap, pe->rect() );
}
void QgsMapOverviewCanvas::refresh()
{
mPixmap.fill( mBgColor ); //palette().color(backgroundRole());
QPainter painter;
painter.begin( &mPixmap );
// antialiasing
if ( mAntiAliasing )
painter.setRenderHint( QPainter::Antialiasing );
// render image
mMapRenderer->render( &painter );
painter.end();
// schedule repaint
update();
// update panning widget
drawExtentRect();
}
void QgsMapOverviewCanvas::setBackgroundColor( const QColor& color )
{
mBgColor = color;
// set erase color
QPalette palette;
palette.setColor( backgroundRole(), color );
setPalette( palette );
}
void QgsMapOverviewCanvas::setLayerSet( const QStringList& layerSet )
{
mMapRenderer->setLayerSet( layerSet );
}
void QgsMapOverviewCanvas::updateFullExtent( const QgsRectangle& rect )
{
mMapRenderer->setExtent( rect );
drawExtentRect();
}
void QgsMapOverviewCanvas::hasCrsTransformEnabled( bool flag )
{
mMapRenderer->setProjectionsEnabled( flag );
}
void QgsMapOverviewCanvas::destinationSrsChanged()
{
const QgsCoordinateReferenceSystem& srs = mMapCanvas->mapRenderer()->destinationSrs();
mMapRenderer->setDestinationSrs( srs );
}
QStringList& QgsMapOverviewCanvas::layerSet()
{
return mMapRenderer->layerSet();
}