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qgsmaptoolcircle3tangents.cpp
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qgsmaptoolcircle3tangents.cpp
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/***************************************************************************
qgsmaptoolcircle3tangents.h - map tool for adding circle
from 3 tangents
---------------------
begin : July 2017
copyright : (C) 2017 by Loïc Bartoletti
email : lbartoletti at tuxfamily dot org
***************************************************************************
* *
* 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 "qgsmaptoolcircle3tangents.h"
#include "qgsgeometryrubberband.h"
#include "qgsadvanceddigitizingdockwidget.h"
#include "qgslinestring.h"
#include "qgssnappingutils.h"
#include "qgsmapcanvas.h"
#include "qgspoint.h"
#include "qgisapp.h"
#include "qgsmapmouseevent.h"
#include "qgsmessagebar.h"
#include "qgssnapindicator.h"
QgsMapToolCircle3Tangents::QgsMapToolCircle3Tangents( QgsMapToolCapture *parentTool,
QgsMapCanvas *canvas, CaptureMode mode )
: QgsMapToolAddCircle( parentTool, canvas, mode )
{
mToolName = tr( "Add circle from 3 tangents" );
}
static QgsPoint getFirstPointOnParallels( const QgsPoint p1_line1, const QgsPoint p2_line1, const QgsPoint pos_line1, const QgsPoint p1_line2, const QgsPoint p2_line2, const QgsPoint pos_line2, const QgsPoint p1_line3, const QgsPoint p2_line3 )
{
QgsPoint intersection;
bool isInter;
if ( ( !QgsGeometryUtils::segmentIntersection( p1_line1, p2_line1, p1_line2, p2_line2, intersection, isInter, true ) ) || ( !QgsGeometryUtils::segmentIntersection( p1_line1, p2_line1, p1_line3, p2_line3, intersection, isInter, true ) ) )
return pos_line1;
if ( !QgsGeometryUtils::segmentIntersection( p1_line2, p2_line2, p1_line3, p2_line3, intersection, isInter, true ) )
return pos_line2;
return QgsPoint();
}
void QgsMapToolCircle3Tangents::cadCanvasReleaseEvent( QgsMapMouseEvent *e )
{
QgsPoint point = mapPoint( *e );
if ( !currentVectorLayer() )
{
notifyNotVectorLayer();
clean();
stopCapturing();
e->ignore();
return;
}
EdgesOnlyFilter filter;
QgsPointLocator::Match match = mCanvas->snappingUtils()->snapToMap( point, &filter );
QgsPointXY p1, p2;
if ( e->button() == Qt::LeftButton )
{
if ( match.isValid() && ( mPoints.size() <= 2 * 2 ) )
{
mPosPoints.append( mapPoint( match.point() ) );
match.edgePoints( p1, p2 );
mPoints.append( mapPoint( p1 ) );
mPoints.append( mapPoint( p2 ) );
}
}
else if ( e->button() == Qt::RightButton )
{
if ( match.isValid() && ( mPoints.size() == 4 ) )
{
match.edgePoints( p1, p2 );
mPoints.append( mapPoint( p1 ) );
mPoints.append( mapPoint( p2 ) );
const QgsPoint pos = getFirstPointOnParallels( mPoints.at( 0 ), mPoints.at( 1 ), mPosPoints.at( 0 ), mPoints.at( 2 ), mPoints.at( 3 ), mPosPoints.at( 1 ), mPoints.at( 4 ), mPoints.at( 5 ) );
mCircle = QgsCircle().from3Tangents( mPoints.at( 0 ), mPoints.at( 1 ), mPoints.at( 2 ), mPoints.at( 3 ), mPoints.at( 4 ), mPoints.at( 5 ), 1E-8, pos );
if ( mCircle.isEmpty() )
{
QgisApp::instance()->messageBar()->pushMessage( tr( "Error" ), tr( "The three segments are parallel" ), Qgis::Critical );
mPoints.clear();
mPosPoints.clear();
delete mTempRubberBand;
mTempRubberBand = nullptr;
}
}
release( e );
}
}
void QgsMapToolCircle3Tangents::cadCanvasMoveEvent( QgsMapMouseEvent *e )
{
QgsPoint point = mapPoint( *e );
mSnapIndicator->setMatch( e->mapPointMatch() );
EdgesOnlyFilter filter;
QgsPointLocator::Match match = mCanvas->snappingUtils()->snapToMap( point, &filter );
if ( !mTempRubberBand )
{
mTempRubberBand = createGeometryRubberBand( mLayerType, true );
mTempRubberBand->show();
}
else
mTempRubberBand->hide();
if ( match.isValid() )
{
QgsPointXY p1, p2;
match.edgePoints( p1, p2 );
if ( mPoints.size() == 4 )
{
const QgsPoint pos = getFirstPointOnParallels( mPoints.at( 0 ), mPoints.at( 1 ), mPosPoints.at( 0 ), mPoints.at( 2 ), mPoints.at( 3 ), mPosPoints.at( 1 ), QgsPoint( p1 ), QgsPoint( p2 ) );
mCircle = QgsCircle().from3Tangents( mPoints.at( 0 ), mPoints.at( 1 ), mPoints.at( 2 ), mPoints.at( 3 ), QgsPoint( p1 ), QgsPoint( p2 ), 1E-8, pos );
mTempRubberBand->setGeometry( mCircle.toLineString() );
mTempRubberBand->show();
}
else
{
std::unique_ptr<QgsLineString> line( new QgsLineString() );
line->addVertex( mapPoint( p1 ) );
line->addVertex( mapPoint( p2 ) );
mTempRubberBand->setGeometry( line.release() );
mTempRubberBand->show();
}
}
}
void QgsMapToolCircle3Tangents::clean( )
{
mPosPoints.clear();
QgsMapToolAddCircle::clean();
}