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qgsmapcanvas.cpp
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qgsmapcanvas.cpp
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/***************************************************************************
qgsmapcanvas.cpp - description
-------------------
begin : Sun Jun 30 2002
copyright : (C) 2002 by Gary E.Sherman
email : sherman at mrcc.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. *
* *
***************************************************************************/
/* $Id$ */
#include <QtGlobal>
#include <Q3Canvas>
#include <Q3CanvasRectangle>
#include <QApplication>
#include <QCursor>
#include <QKeyEvent>
//#include <QMessageBox>
#include <QMouseEvent>
#include <QPaintDevice>
#include <QPainter>
#include <QPaintEvent>
#include <QPixmap>
#include <QRect>
#include <QResizeEvent>
#include <QSettings>
#include <QString>
#include <QStringList>
#include <QWheelEvent>
#include "qgis.h"
#include "qgsmapcanvas.h"
#include "qgsmapcanvasmap.h"
#include "qgsmaplayer.h"
#include "qgsmaplayerregistry.h"
#include "qgsmaptool.h"
#include "qgsmaptopixel.h"
#include "qgsmapoverviewcanvas.h"
#include "qgsmaprender.h"
#include "qgsproject.h"
#include "qgsrubberband.h"
#include "qgsmessageviewer.h"
#include "qgsmaptoolzoom.h"
#include "qgsmaptoolpan.h"
/** @DEPRECATED: to be deleted, stuff from here should be moved elsewhere */
class QgsMapCanvas::CanvasProperties
{
public:
CanvasProperties() : panSelectorDown( false ) { }
//!Flag to indicate status of mouse button
bool mouseButtonDown;
//! Last seen point of the mouse
QPoint mouseLastXY;
//! Beginning point of a rubber band
QPoint rubberStartPoint;
//! Flag to indicate the pan selector key is held down by user
bool panSelectorDown;
};
// But the static members must be initialised outside the class! (or GCC 4 dies)
const double QgsMapCanvas::scaleDefaultMultiple = 2.0;
/** note this is private and so shouldn't be accessible */
QgsMapCanvas::QgsMapCanvas()
{}
QgsMapCanvas::QgsMapCanvas(QWidget * parent, const char *name)
: Q3CanvasView(parent, name),
mCanvasProperties(new CanvasProperties)
{
mCanvas = new Q3Canvas();
setCanvas(mCanvas);
setHScrollBarMode(Q3ScrollView::AlwaysOff);
setVScrollBarMode(Q3ScrollView::AlwaysOff);
mCurrentLayer = NULL;
mMapOverview = NULL;
mMapTool = NULL;
mLastNonZoomMapTool = NULL;
mDrawing = false;
mFrozen = false;
mDirty = true;
// by default, the canvas is rendered
mRenderFlag = true;
viewport()->setMouseTracking(true);
setFocusPolicy(Qt::StrongFocus);
mMapRender = new QgsMapRender;
// create map canvas item which will show the map
mMap = new QgsMapCanvasMap(mCanvas, mMapRender);
mMap->show();
int myRedInt = QgsProject::instance()->readNumEntry("Gui","/CanvasColorRedPart",255);
int myGreenInt = QgsProject::instance()->readNumEntry("Gui","/CanvasColorGreenPart",255);
int myBlueInt = QgsProject::instance()->readNumEntry("Gui","/CanvasColorBluePart",255);
QColor myColor = QColor(myRedInt,myGreenInt,myBlueInt);
setCanvasColor(myColor);
moveCanvasContents(TRUE);
connect(mMapRender, SIGNAL(updateMap()), this, SLOT(updateMap()));
connect(mMapRender, SIGNAL(drawError(QgsMapLayer*)), this, SLOT(showError(QgsMapLayer*)));
} // QgsMapCanvas ctor
QgsMapCanvas::~QgsMapCanvas()
{
delete mMapTool;
delete mLastNonZoomMapTool;
// delete canvas items prior to deleteing the canvas
// because they might try to update canvas when it's
// already being destructed, ends with segfault
Q3CanvasItemList list = mCanvas->allItems();
Q3CanvasItemList::iterator it = list.begin();
while (it != list.end())
{
Q3CanvasItem* item = *it;
delete item;
it++;
}
delete mCanvas;
delete mMapRender;
// mCanvasProperties auto-deleted via std::auto_ptr
// CanvasProperties struct has its own dtor for freeing resources
} // dtor
void QgsMapCanvas::enableAntiAliasing(bool theFlag)
{
mMap->enableAntiAliasing(theFlag);
if (mMapOverview)
mMapOverview->enableAntiAliasing(theFlag);
} // anti aliasing
QgsMapCanvasMap* QgsMapCanvas::map()
{
return mMap;
}
QgsMapRender* QgsMapCanvas::mapRender()
{
return mMapRender;
}
QgsMapLayer* QgsMapCanvas::getZpos(int index)
{
QString layer = mMapRender->layers().layerSet()[index];
return QgsMapLayerRegistry::instance()->mapLayer(layer);
}
void QgsMapCanvas::setCurrentLayer(QgsMapLayer* layer)
{
mCurrentLayer = layer;
std::cout << "QgsMapCanvas::setCurrentLayer" << std::endl;
}
double QgsMapCanvas::getScale()
{
return mMapRender->scale();
} // getScale
void QgsMapCanvas::setDirty(bool dirty)
{
mDirty = dirty;
}
bool QgsMapCanvas::isDirty() const
{
return mDirty;
}
bool QgsMapCanvas::isDrawing()
{
return mDrawing;
} // isDrawing
// return the current coordinate transform based on the extents and
// device size
QgsMapToPixel * QgsMapCanvas::getCoordinateTransform()
{
return mMapRender->coordXForm();
}
void QgsMapCanvas::setLayerSet(std::deque<QString>& layerSet)
{
QgsMapLayerSet& layers = mMapRender->layers();
int i;
for (i = 0; i < layerCount(); i++)
{
QObject::disconnect(getZpos(i), SIGNAL(repaintRequested()), this, SLOT(refresh()));
}
layers.setLayerSet(layerSet);
for (i = 0; i < layerCount(); i++)
{
QObject::connect(getZpos(i), SIGNAL(repaintRequested()), this, SLOT(refresh()));
}
if (mMapOverview)
{
mMapOverview->setLayerSet(layerSet);
updateOverview();
}
emit layersChanged();
refresh();
} // addLayer
void QgsMapCanvas::setOverview(QgsMapOverviewCanvas* overview)
{
mMapOverview = overview;
}
void QgsMapCanvas::updateOverview()
{
// redraw overview
if (mMapOverview)
{
mMapOverview->refresh();
}
}
QgsMapLayer* QgsMapCanvas::currentLayer()
{
return mCurrentLayer;
}
void QgsMapCanvas::refresh()
{
clear();
#ifdef Q_WS_MACX
if (mDirty)
{
render();
}
#endif
updateContents();
} // refresh
#ifdef Q_WS_MACX
void QgsMapCanvas::paintEvent(QPaintEvent * ev)
{
int cx, cy, cw, ch;
ev->rect().getRect(&cx, &cy, &cw, &ch);
QPainter p(this);
drawContents(&p, cx, cy, cw, ch);
}
#else
void QgsMapCanvas::drawContents(QPainter * p, int cx, int cy, int cw, int ch)
{
#ifdef QGISDEBUG
std::cout << "QgsMapCanvas::drawContents" << std::endl;
#endif
if (mDirty)
{
render();
// XXX painting pixmap immediately after it's been rendered
// doesn't work, ending with warnings that painter isn't active
updateContents();
return;
}
Q3CanvasView::drawContents(p, cx, cy, cw, ch);
}
#endif
void QgsMapCanvas::render()
{
#ifdef QGISDEBUG
QString msg = mFrozen ? "frozen" : "thawed";
std::cout << "QgsMapCanvas::render: canvas is " << msg.toLocal8Bit().data() << std::endl;
#endif
if (!mFrozen)
{
if (mRenderFlag && mDirty)
{
// Tell the user we're going to be a while
QApplication::setOverrideCursor(Qt::WaitCursor);
mMap->render();
mDirty = false;
// notify any listeners that rendering is complete
QPainter p;
p.begin(&mMap->pixmap());
emit renderComplete(&p);
p.end();
// notifies current map tool
if (mMapTool)
mMapTool->renderComplete();
// Tell the user we've finished going to be a while
QApplication::restoreOverrideCursor();
}
}
} // render
//the format defaults to "PNG" if not specified
void QgsMapCanvas::saveAsImage(QString theFileName, QPixmap * theQPixmap, QString theFormat)
{
//
//check if the optional QPaintDevice was supplied
//
if (theQPixmap != NULL)
{
// render
QPainter painter;
painter.begin(theQPixmap);
mMapRender->render(&painter);
painter.end();
theQPixmap->save(theFileName,theFormat.toLocal8Bit().data());
}
else //use the map view
{
mMap->pixmap().save(theFileName,theFormat.toLocal8Bit().data());
}
} // saveAsImage
QgsRect QgsMapCanvas::extent() const
{
return mMapRender->extent();
} // extent
QgsRect QgsMapCanvas::fullExtent() const
{
return mMapRender->layers().fullExtent();
} // extent
void QgsMapCanvas::updateFullExtent()
{
// projection settings have changed
#ifdef QGISDEBUG
std::cout << "QgsMapCanvas::updateFullExtent" << std::endl;
#endif
mMapRender->layers().updateFullExtent();
if (mMapOverview)
{
mMapOverview->updateFullExtent();
mMapOverview->reflectChangedExtent();
updateOverview();
}
refresh();
}
void QgsMapCanvas::setExtent(QgsRect const & r)
{
QgsRect current = extent();
mMapRender->setExtent(r);
emit extentsChanged(mMapRender->extent());
updateScale();
if (mMapOverview)
mMapOverview->reflectChangedExtent();
mLastExtent = current;
// notify canvas items of change
updateCanvasItemsPositions();
} // setExtent
void QgsMapCanvas::updateScale()
{
double scale = mMapRender->scale();
QString myScaleString("Scale ");
int thePrecision = 0;
if (scale == 0)
myScaleString = "";
else if (scale >= 1)
myScaleString += QString("1: ") + QString::number(scale,'f',thePrecision);
else
myScaleString += QString::number(1.0/scale, 'f', thePrecision) + QString(": 1");
emit scaleChanged(myScaleString);
}
void QgsMapCanvas::clear()
{
// Indicate to the next paint event that we need to rebuild the canvas contents
setDirty(TRUE);
} // clear
void QgsMapCanvas::zoomFullExtent()
{
setExtent(fullExtent());
refresh();
} // zoomFullExtent
void QgsMapCanvas::zoomPreviousExtent()
{
QgsRect current = extent();
setExtent(mLastExtent);
mLastExtent = current;
refresh();
} // zoomPreviousExtent
bool QgsMapCanvas::projectionsEnabled()
{
if (QgsProject::instance()->readNumEntry("SpatialRefSys","/ProjectionsEnabled",0)!=0)
{
return true;
}
else
{
return false;
}
}
void QgsMapCanvas::mapUnitsChanged()
{
// We assume that if the map units have changed, the changed value
// will be accessible from QgsProject.
setMapUnits(QgsProject::instance()->mapUnits());
}
void QgsMapCanvas::zoomToSelected()
{
QgsVectorLayer *lyr = dynamic_cast < QgsVectorLayer * >(mCurrentLayer);
if (lyr)
{
QgsRect rect ;
if (projectionsEnabled())
{
try
{
if ( ! lyr->coordinateTransform() )
{
#ifdef QGISDEBUG
std::cout << "Throwing exception "<< __FILE__ << __LINE__ << std::endl;
#endif
throw QgsCsException( string("NO COORDINATE TRANSFORM FOUND FOR LAYER") );
}
rect = lyr->coordinateTransform()->transformBoundingBox(lyr->bBoxOfSelected());
}
catch (QgsCsException &cse)
{
qDebug( "Transform error caught in %s line %d:\n%s", __FILE__, __LINE__, cse.what());
}
}
else
{
rect = lyr->bBoxOfSelected();
}
// no selected features, only one selected point feature
//or two point features with the same x- or y-coordinates
if(rect.isEmpty())
{
return;
}
//zoom to an area
else
{
// TODO: why such complicated way? [MD]
QgsRect r;
r.setXmin(rect.xMin());
r.setYmin(rect.yMin());
r.setXmax(rect.xMax());
r.setYmax(rect.yMax());
setExtent(r);
refresh();
return;
}
}
} // zoomToSelected
void QgsMapCanvas::keyPressEvent(QKeyEvent * e)
{
#ifdef QGISDEBUG
qDebug("keyPress event at line %d in %s", __LINE__, __FILE__);
#endif
if (mCanvasProperties->mouseButtonDown || mCanvasProperties->panSelectorDown)
return;
QPainter paint;
QPen pen(Qt::gray);
QgsPoint ll, ur;
if (! mCanvasProperties->mouseButtonDown )
{
// Don't want to interfer with mouse events
QgsRect currentExtent = mMapRender->extent();
double dx = fabs((currentExtent.xMax()- currentExtent.xMin()) / 4);
double dy = fabs((currentExtent.yMax()- currentExtent.yMin()) / 4);
switch ( e->key() )
{
case Qt::Key_Left:
#ifdef QGISDEBUG
std::cout << "Pan left" << std::endl;
#endif
currentExtent.setXmin(currentExtent.xMin() - dx);
currentExtent.setXmax(currentExtent.xMax() - dx);
setExtent(currentExtent);
refresh();
break;
case Qt::Key_Right:
#ifdef QGISDEBUG
std::cout << "Pan right" << std::endl;
#endif
currentExtent.setXmin(currentExtent.xMin() + dx);
currentExtent.setXmax(currentExtent.xMax() + dx);
setExtent(currentExtent);
refresh();
break;
case Qt::Key_Up:
#ifdef QGISDEBUG
std::cout << "Pan up" << std::endl;
#endif
currentExtent.setYmax(currentExtent.yMax() + dy);
currentExtent.setYmin(currentExtent.yMin() + dy);
setExtent(currentExtent);
refresh();
break;
case Qt::Key_Down:
#ifdef QGISDEBUG
std::cout << "Pan down" << std::endl;
#endif
currentExtent.setYmax(currentExtent.yMax() - dy);
currentExtent.setYmin(currentExtent.yMin() - dy);
setExtent(currentExtent);
refresh();
break;
case Qt::Key_Space:
#ifdef QGISDEBUG
std::cout << "Pressing pan selector" << std::endl;
#endif
//mCanvasProperties->dragging = true;
if ( ! e->isAutoRepeat() )
{
mCanvasProperties->panSelectorDown = true;
mCanvasProperties->rubberStartPoint = mCanvasProperties->mouseLastXY;
}
break;
default:
// Pass it on
e->ignore();
#ifdef QGISDEBUG
qDebug("Ignoring key (%d)", e->key());
#endif
}
}
} //keyPressEvent()
void QgsMapCanvas::keyReleaseEvent(QKeyEvent * e)
{
#ifdef QGISDEBUG
qDebug("keyRelease event at line %d in %s", __LINE__, __FILE__);
#endif
switch( e->key() )
{
case Qt::Key_Space:
if ( !e->isAutoRepeat() && mCanvasProperties->panSelectorDown)
{
#ifdef QGISDEBUG
std::cout << "Releaseing pan selector" << std::endl;
#endif
mCanvasProperties->panSelectorDown = false;
panActionEnd(mCanvasProperties->mouseLastXY);
}
break;
default:
// Pass it on
e->ignore();
#ifdef QGISDEBUG
qDebug("Ignoring key release (%d)", e->key());
#endif
}
} //keyReleaseEvent()
void QgsMapCanvas::contentsMousePressEvent(QMouseEvent * e)
{
// call handler of current map tool
if (mMapTool)
mMapTool->canvasPressEvent(e);
if (mCanvasProperties->panSelectorDown)
return;
mCanvasProperties->mouseButtonDown = true;
mCanvasProperties->rubberStartPoint = e->pos();
} // mousePressEvent
void QgsMapCanvas::contentsMouseReleaseEvent(QMouseEvent * e)
{
// call handler of current map tool
if (mMapTool)
{
mMapTool->canvasReleaseEvent(e);
// right button was pressed in zoom tool? return to previous non zoom tool
QString name = mMapTool->toolName();
if (e->button() == Qt::RightButton && (name == MapTool_Zoom || name == MapTool_Pan))
{
#ifdef QGISDEBUG
std::cout << "Right click in map tool zoom or pan, last tool is " << (mLastNonZoomMapTool ? "not null." : "null.") << std::endl;
#endif
// change to older non-zoom tool
if (mLastNonZoomMapTool)
{
QgsMapTool* t = mLastNonZoomMapTool;
mLastNonZoomMapTool = NULL;
setMapTool(t);
}
return;
}
}
mCanvasProperties->mouseButtonDown = false;
if (mCanvasProperties->panSelectorDown)
return;
} // mouseReleaseEvent
void QgsMapCanvas::resizeEvent(QResizeEvent * e)
{
int width = e->size().width(), height = e->size().height();
// int width = visibleWidth(), height = visibleHeight();
mCanvas->resize(width, height);
mMap->resize(/*e->size()*/ QSize(width,height));
// notify canvas items of change
updateCanvasItemsPositions();
updateScale();
refresh();
} // resizeEvent
void QgsMapCanvas::updateCanvasItemsPositions()
{
Q3CanvasItemList list = mCanvas->allItems();
Q3CanvasItemList::iterator it = list.begin();
while (it != list.end())
{
QgsMapCanvasItem* item = dynamic_cast<QgsMapCanvasItem*>(*it);
if (item)
{
item->updatePosition();
}
it++;
}
}
void QgsMapCanvas::wheelEvent(QWheelEvent *e)
{
// Zoom the map canvas in response to a mouse wheel event. Moving the
// wheel forward (away) from the user zooms in by a factor of 2.
// TODO The scale factor needs to be customizable by the user.
#ifdef QGISDEBUG
std::cout << "Wheel event delta " << e->delta() << std::endl;
#endif
// change extent
zoomWithCenter(e->x(), e->y(), e->delta() > 0);
}
void QgsMapCanvas::zoomWithCenter(int x, int y, bool zoomIn)
{
zoomByScale(x, y, (zoomIn ? 1/scaleDefaultMultiple : scaleDefaultMultiple));
}
void QgsMapCanvas::contentsMouseMoveEvent(QMouseEvent * e)
{
mCanvasProperties->mouseLastXY = e->pos();
if (mCanvasProperties->panSelectorDown)
{
panAction(e);
}
// call handler of current map tool
if (mMapTool)
mMapTool->canvasMoveEvent(e);
// show x y on status bar
QPoint xy = e->pos();
QgsPoint coord = getCoordinateTransform()->toMapCoordinates(xy);
emit xyCoordinates(coord);
} // mouseMoveEvent
/**
* Zooms at the given screen x and y by the given scale (< 1, zoom out, > 1, zoom in)
*/
void QgsMapCanvas::zoomByScale(int x, int y, double scaleFactor)
{
// transform the mouse pos to map coordinates
QgsPoint center = getCoordinateTransform()->toMapPoint(x, y);
QgsRect r = mMapRender->extent();
r.scale(scaleFactor, ¢er);
setExtent(r);
refresh();
}
/** Sets the map tool currently being used on the canvas */
void QgsMapCanvas::setMapTool(QgsMapTool* tool)
{
if (mMapTool)
mMapTool->deactivate();
#ifdef QGISDEBUG
std::cout << "setMapTool: using tool " <<
(tool ? tool->toolName().toLocal8Bit().data() : "null") << std::endl;
#endif
if (tool && (tool->toolName() == MapTool_Zoom || tool->toolName() == MapTool_Pan))
{
// if zoom or pan tool will be active, save old tool
// to bring it back on right click
// (but only if it wasn't also zoom or pan tool)
if (mMapTool && mMapTool->toolName() != MapTool_Zoom && mMapTool->toolName() != MapTool_Pan)
{
delete mLastNonZoomMapTool;
mLastNonZoomMapTool = mMapTool;
}
}
else
{
// if there's already an old tool, delete it
delete mLastNonZoomMapTool;
mLastNonZoomMapTool = NULL;
// delete current map tool
delete mMapTool;
}
// set new map tool and activate it
mMapTool = tool;
if (mMapTool)
mMapTool->activate();
} // setMapTool
/** Write property of QColor bgColor. */
void QgsMapCanvas::setCanvasColor(const QColor & theColor)
{
// background of map's pixmap
mMap->setBgColor(theColor);
// background of the Q3CavnasView
QPalette palette;
palette.setColor(backgroundRole(), theColor);
setPalette(palette);
// background of Q3Canvas
mCanvas->setBackgroundColor(theColor);
if (mMapOverview)
mMapOverview->setbgColor(theColor);
} // setbgColor
int QgsMapCanvas::layerCount() const
{
return mMapRender->layers().layerCount();
} // layerCount
void QgsMapCanvas::layerStateChange()
{
// called when a layer has changed visibility setting
refresh();
} // layerStateChange
void QgsMapCanvas::freeze(bool frz)
{
mFrozen = frz;
} // freeze
bool QgsMapCanvas::isFrozen()
{
return mFrozen;
} // freeze
QPixmap * QgsMapCanvas::canvasPixmap()
{
return &mMap->pixmap();
} // canvasPixmap
double QgsMapCanvas::mupp() const
{
return mMapRender->mupp();
} // mupp
void QgsMapCanvas::setMapUnits(QGis::units u)
{
#ifdef QGISDEBUG
std::cerr << "Setting map units to " << static_cast<int>(u) << std::endl;
#endif
mMapRender->setMapUnits(u);
}
QGis::units QgsMapCanvas::mapUnits() const
{
return mMapRender->mapUnits();
}
void QgsMapCanvas::setRenderFlag(bool theFlag)
{
mRenderFlag = theFlag;
// render the map
if(mRenderFlag)
{
refresh();
}
}
void QgsMapCanvas::connectNotify( const char * signal )
{
#ifdef QGISDEBUG
std::cerr << "QgsMapCanvas connected to " << signal << "\n";
#endif
} // QgsMapCanvas::connectNotify( const char * signal )
bool QgsMapCanvas::writeXML(QDomNode & layerNode, QDomDocument & doc)
{
// Write current view extents
QDomElement extentNode = doc.createElement("extent");
layerNode.appendChild(extentNode);
QDomElement xMin = doc.createElement("xmin");
QDomElement yMin = doc.createElement("ymin");
QDomElement xMax = doc.createElement("xmax");
QDomElement yMax = doc.createElement("ymax");
QgsRect r = mMapRender->extent();
QDomText xMinText = doc.createTextNode(QString::number(r.xMin(), 'f'));
QDomText yMinText = doc.createTextNode(QString::number(r.yMin(), 'f'));
QDomText xMaxText = doc.createTextNode(QString::number(r.xMax(), 'f'));
QDomText yMaxText = doc.createTextNode(QString::number(r.yMax(), 'f'));
xMin.appendChild(xMinText);
yMin.appendChild(yMinText);
xMax.appendChild(xMaxText);
yMax.appendChild(yMaxText);
extentNode.appendChild(xMin);
extentNode.appendChild(yMin);
extentNode.appendChild(xMax);
extentNode.appendChild(yMax);
std::deque<QString>& layers = mMapRender->layers().layerSet();
// Iterate over layers in zOrder
// Call writeXML() on each
QDomElement projectLayersNode = doc.createElement("projectlayers");
projectLayersNode.setAttribute("layercount", qulonglong( layers.size() ));
std::deque<QString>::iterator li = layers.begin();
while (li != layers.end())
{
QgsMapLayer *ml = QgsMapLayerRegistry::instance()->mapLayer(*li);
if (ml)
{
ml->writeXML(projectLayersNode, doc);
}
li++;
}
layerNode.appendChild(projectLayersNode);
return true;
}
QgsMapTool* QgsMapCanvas::mapTool()
{
return mMapTool;
}
void QgsMapCanvas::panActionEnd(QPoint releasePoint)
{
// move map image and other items to standard position
moveCanvasContents(TRUE); // TRUE means reset
// use start and end box points to calculate the extent
QgsPoint start = getCoordinateTransform()->toMapCoordinates(mCanvasProperties->rubberStartPoint);
QgsPoint end = getCoordinateTransform()->toMapCoordinates(releasePoint);
double dx = fabs(end.x() - start.x());
double dy = fabs(end.y() - start.y());
// modify the extent
QgsRect r = mMapRender->extent();
if (end.x() < start.x())
{
r.setXmin(r.xMin() + dx);
r.setXmax(r.xMax() + dx);