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qgsmeasuretool.cpp
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qgsmeasuretool.cpp
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/***************************************************************************
qgsmeasuretool.cpp - map tool for measuring distances and areas
---------------------
begin : April 2007
copyright : (C) 2007 by Martin Dobias
email : wonder.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. *
* *
***************************************************************************/
/* $Id$ */
#include "qgsdistancearea.h"
#include "qgslogger.h"
#include "qgsmapcanvas.h"
#include "qgsmaprenderer.h"
#include "qgsmaptopixel.h"
#include "qgsrubberband.h"
#include "qgsvectorlayer.h"
#include "qgstolerance.h"
#include "qgsmeasuredialog.h"
#include "qgsmeasuretool.h"
#include "qgscursors.h"
#include <QMessageBox>
#include <QMouseEvent>
#include <QSettings>
QgsMeasureTool::QgsMeasureTool( QgsMapCanvas* canvas, bool measureArea )
: QgsMapTool( canvas )
{
mMeasureArea = measureArea;
mRubberBand = new QgsRubberBand( canvas, mMeasureArea );
QPixmap myCrossHairQPixmap = QPixmap(( const char ** ) cross_hair_cursor );
mCursor = QCursor( myCrossHairQPixmap, 8, 8 );
mRightMouseClicked = false;
mDialog = new QgsMeasureDialog( this );
}
QgsMeasureTool::~QgsMeasureTool()
{
delete mRubberBand;
}
const QList<QgsPoint>& QgsMeasureTool::points()
{
return mPoints;
}
void QgsMeasureTool::activate()
{
mDialog->restorePosition();
QgsMapTool::activate();
mRightMouseClicked = false;
// ensure that we have correct settings
updateSettings();
// If we suspect that they have data that is projected, yet the
// map CRS is set to a geographic one, warn them.
if ( mCanvas->mapRenderer()->distanceArea()->geographic() &&
( mCanvas->extent().height() > 360 ||
mCanvas->extent().width() > 720 ) )
{
QMessageBox::warning( NULL, tr( "Incorrect measure results" ),
tr( "<p>This map is defined with a geographic coordinate system "
"(latitude/longitude) "
"but the map extents suggests that it is actually a projected "
"coordinate system (e.g., Mercator). "
"If so, the results from line or area measurements will be "
"incorrect.</p>"
"<p>To fix this, explicitly set an appropriate map coordinate "
"system using the <tt>Settings:Project Properties</tt> menu." ) );
mWrongProjectProjection = true;
}
}
void QgsMeasureTool::deactivate()
{
mDialog->close();
QgsMapTool::deactivate();
}
void QgsMeasureTool::restart()
{
mPoints.clear();
mRubberBand->reset( mMeasureArea );
// re-read settings
updateSettings();
mRightMouseClicked = false;
mWrongProjectProjection = false;
}
void QgsMeasureTool::updateSettings()
{
QSettings settings;
int myRed = settings.value( "/qgis/default_measure_color_red", 180 ).toInt();
int myGreen = settings.value( "/qgis/default_measure_color_green", 180 ).toInt();
int myBlue = settings.value( "/qgis/default_measure_color_blue", 180 ).toInt();
mRubberBand->setColor( QColor( myRed, myGreen, myBlue ) );
}
//////////////////////////
void QgsMeasureTool::canvasPressEvent( QMouseEvent * e )
{
if ( e->button() == Qt::LeftButton )
{
if ( mRightMouseClicked )
mDialog->restart();
QgsPoint idPoint = mCanvas->getCoordinateTransform()->toMapCoordinates( e->x(), e->y() );
mDialog->mousePress( idPoint );
}
}
void QgsMeasureTool::canvasMoveEvent( QMouseEvent * e )
{
if ( !mRightMouseClicked )
{
QgsVectorLayer *vl = dynamic_cast<QgsVectorLayer *>( mCanvas->currentLayer() );
QgsPoint point = mCanvas->getCoordinateTransform()->toMapCoordinates( e->pos().x(), e->pos().y() );
if ( vl )
{
vl->snapPoint( point, QgsTolerance::defaultTolerance( vl, mCanvas->mapRenderer() ) );
}
mRubberBand->movePoint( point );
mDialog->mouseMove( point );
}
}
void QgsMeasureTool::canvasReleaseEvent( QMouseEvent * e )
{
QgsVectorLayer *vl = dynamic_cast<QgsVectorLayer *>( mCanvas->currentLayer() );
QgsPoint point = mCanvas->getCoordinateTransform()->toMapCoordinates( e->pos().x(), e->pos().y() );
if ( vl )
{
vl->snapPoint( point, QgsTolerance::defaultTolerance( vl, mCanvas->mapRenderer() ) );
}
if ( e->button() == Qt::RightButton && ( e->buttons() & Qt::LeftButton ) == 0 ) // restart
{
if ( mRightMouseClicked )
mDialog->restart();
else
mRightMouseClicked = true;
}
else if ( e->button() == Qt::LeftButton )
{
addPoint( point );
mDialog->show();
}
}
void QgsMeasureTool::addPoint( QgsPoint &point )
{
QgsDebugMsg( "point=" + point.toString() );
// don't add points with the same coordinates
if ( mPoints.size() > 0 && point == mPoints[0] )
return;
QgsPoint pnt( point );
mPoints.append( pnt );
mRubberBand->addPoint( point );
mDialog->addPoint( point );
}