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qgsmaptoolvertexedit.cpp
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qgsmaptoolvertexedit.cpp
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/***************************************************************************
qgsmaptoolvertexedit.cpp - tool for adding, moving, deleting vertices
---------------------
begin : January 2006
copyright : (C) 2006 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 "qgsmaptoolvertexedit.h"
#include "qgsmapcanvas.h"
#include "qgsvertexmarker.h"
#include "qgsrubberband.h"
#include "qgsvectorlayer.h"
#include "qgsvectordataprovider.h"
#include "qgsmaptopixel.h"
#include "qgsproject.h"
#include "qgscursors.h"
#include <QMessageBox>
#include <QPixmap>
#include <QCursor>
QgsMapToolVertexEdit::QgsMapToolVertexEdit(QgsMapCanvas* canvas, enum Tool tool)
: QgsMapTool(canvas), mTool(tool), mRubberBandIndex1(-1), mRubberBandIndex2(-1), mRubberBand(0)
{
// TODO - select a real cursor
QPixmap mySelectQPixmap = QPixmap((const char **) capture_point_cursor);
mCursor = QCursor(mySelectQPixmap, 8, 8);
}
QgsMapToolVertexEdit::~QgsMapToolVertexEdit()
{
delete mRubberBand;
mRubberBand = 0;
}
void QgsMapToolVertexEdit::canvasMoveEvent(QMouseEvent * e)
{
if (e->buttons() == Qt::LeftButton && (mTool == AddVertex || mTool == MoveVertex))
{
//int index = (mStartPointValid ? 1 : 0);
int index;
if(mTool == MoveVertex)
{
if(mRubberBandIndex1 == -1)
{
index = 0;
}
else
{
index = 1;
}
}
else
{
index = 1;
}
//snap to nearest vertex of vectorlayer
QgsPoint rbpoint = toMapCoords(e->pos());
if(mTool == AddVertex)
{
snapVertex(rbpoint, mSnappedAtFeatureId, mSnappedBeforeVertex.back());
}
else if(mTool == MoveVertex)
{
snapVertex(rbpoint, mSnappedAtFeatureId, mSnappedAtVertex.back());
}
mRubberBand->movePoint(index, rbpoint);
}
}
void QgsMapToolVertexEdit::canvasPressEvent(QMouseEvent * e)
{
QgsPoint point = toMapCoords(e->pos());
double x1, y1;
double x2, y2;
QgsGeometryVertexIndex index, rb1Index, rb2Index; //rb1Index/rb2Index is for rubberbanding
if (mTool == AddVertex)
{
// Find the closest line segment to the mouse position
// Then set up the rubber band to its endpoints
#ifdef QGISDEBUG
std::cout << "QgsMapCanvas::mousePressEvent: QGis::AddVertex." << std::endl;
#endif
//Find nearest segment of the selected line, move that node to the mouse location
if (!snapSegmentWithContext(point))
{
QMessageBox::warning(0, "Error",
QObject::tr("Could not snap segment. Have you set the tolerance in Settings > Project Properties > General?"),
QMessageBox::Ok, Qt::NoButton);
return;
}
index = mSnappedBeforeVertex;
// Get the endpoint of the snapped-to segment
mSnappedAtGeometry.vertexAt(x2, y2, index);
// Get the startpoint of the snapped-to segment
index.decrement_back();
mStartPointValid = mSnappedAtGeometry.vertexAt(x1, y1, index);
createRubberBand();
if (mStartPointValid)
{
mRubberBand->addPoint(QgsPoint(x1,y1));
}
mRubberBand->addPoint(toMapCoords(e->pos()));
mRubberBand->addPoint(QgsPoint(x2,y2));
}
else if (mTool == MoveVertex)
{
#ifdef QGISDEBUG
std::cout << "QgsMapCanvas::mousePressEvent: QGis::MoveVertex." << std::endl;
#endif
// Find the closest line segment to the mouse position
// Then find the closest vertex on that line segment
// Then set up the rubber band to its adjoining vertexes
QgsPoint snapPoint;
snapPoint = point;
if (!snapSegmentWithContext(snapPoint))
{
QMessageBox::warning(0, "Error",
QObject::tr("Could not snap segment. Have you set the tolerance in Settings > Project Properties > General?"),
QMessageBox::Ok, Qt::NoButton);
return;
}
snapPoint = point;
if (!snapVertexOfSnappedSegment(snapPoint))
{
QMessageBox::warning(0, "Error",
QObject::tr("Could not snap vertex. Have you set the tolerance in Settings > Project Properties > General?"),
QMessageBox::Ok, Qt::NoButton);
return;
}
#ifdef QGISDEBUG
qWarning("Creating rubber band for moveVertex");
#endif
index = mSnappedAtVertex;
createRubberBand();
if(mRubberBandIndex1 != -1)
{
rb1Index.push_back(mRubberBandIndex1);
mSnappedAtGeometry.vertexAt(x1, y1, rb1Index);
mRubberBand->addPoint(QgsPoint(x1,y1));
mStartPointValid = true;
}
else
{
mStartPointValid = false;
}
if(mRubberBandIndex1 != -1 && mRubberBandIndex2 != -1)
{
mRubberBand->addPoint(toMapCoords(e->pos()));
}
if(mRubberBandIndex2 != -1)
{
rb2Index.push_back(mRubberBandIndex2);
mSnappedAtGeometry.vertexAt(x2, y2, rb2Index);
mRubberBand->addPoint(QgsPoint(x2,y2));
}
#ifdef QGISDEBUG
qWarning("Creating rubber band for moveVertex");
#endif
}
else if (mTool == DeleteVertex)
{
#ifdef QGISDEBUG
std::cout << "QgsMapCanvas::mousePressEvent: QGis::DeleteVertex." << std::endl;
#endif
// TODO: Find nearest node of the selected line, show a big X symbol
// TODO: Find nearest segment of the selected line, move that node to the mouse location
if (!snapVertexWithContext(point))
{
QMessageBox::warning(0, "Error",
QObject::tr("Could not snap vertex. Have you set the tolerance in Settings > Project Properties > General?"),
QMessageBox::Ok, Qt::NoButton);
return;
}
// Get the point of the snapped-to vertex
mSnappedAtGeometry.vertexAt(x1, y1, mSnappedAtVertex);
mCross = new QgsVertexMarker(mCanvas);
mCross->setIconType(QgsVertexMarker::ICON_X);
mCross->setCenter(QgsPoint(x1,y1));
}
}
double QgsMapToolVertexEdit::tolerance()
{
// TODO: tolerance should be in screen pixels
// here it can be computed for map coordinates depending on zoom
return QgsProject::instance()->readDoubleEntry("Digitizing","/Tolerance",0);
}
bool QgsMapToolVertexEdit::snapSegmentWithContext(QgsPoint& point)
{
QgsVectorLayer* vlayer = dynamic_cast<QgsVectorLayer*>(mCanvas->currentLayer());
QgsGeometryVertexIndex beforeVertex;
int atFeatureId;
QgsGeometry atGeometry;
if (!vlayer)
return FALSE;
// TODO: Find nearest segment of the selected line, move that node to the mouse location
if (!vlayer->snapSegmentWithContext(point, beforeVertex, atFeatureId, atGeometry, tolerance()))
{
mSnappedAtFeatureId = -1;
QMessageBox::warning(0, "Error",
QObject::tr("Could not snap segment. Have you set the tolerance in Settings > Project Properties > General?"),
QMessageBox::Ok, Qt::NoButton);
return FALSE;
}
else
{
#ifdef QGISDEBUG
std::cout << "QgsMapToolVertexEdit::snapSegmentWithContext: Snapped to segment fid " << atFeatureId << "." << std::endl;
#endif
// Save where we snapped to
mSnappedBeforeVertex = beforeVertex;
mSnappedAtFeatureId = atFeatureId;
mSnappedAtGeometry = atGeometry;
return TRUE;
}
}
bool QgsMapToolVertexEdit::snapVertexWithContext(QgsPoint& point)
{
QgsVectorLayer* vlayer = dynamic_cast<QgsVectorLayer*>(mCanvas->currentLayer());
QgsGeometryVertexIndex atVertex;
int atFeatureId;
QgsGeometry atGeometry;
if (!vlayer)
return FALSE;
if (!vlayer->snapVertexWithContext(point, atVertex, mRubberBandIndex1, mRubberBandIndex2, atFeatureId, atGeometry, tolerance()))
{
mSnappedAtFeatureId = -1;
return FALSE;
}
else
{
#ifdef QGISDEBUG
std::cout << "QgsMapToolVertexEdit: Snapped to segment fid " << atFeatureId << "." << std::endl;
#endif
// Save where we snapped to
mSnappedAtVertex = atVertex;
mSnappedAtFeatureId = atFeatureId;
mSnappedAtGeometry = atGeometry;
return TRUE;
}
}
bool QgsMapToolVertexEdit::snapVertexOfSnappedSegment(QgsPoint& point)
{
double twoBeforeVertexSqrDist;
double beforeVertexSqrDist;
// Set up the "other side" of the snapped-to segment
QgsGeometryVertexIndex snappedTwoBeforeVertex(mSnappedBeforeVertex);
snappedTwoBeforeVertex.decrement_back();
#ifdef QGISDEBUG
std::cout << "QgsMapToolVertexEdit::snapVertexOfSnappedSegment: Choice of "
<< snappedTwoBeforeVertex.toString().toLocal8Bit().data() << " or "
<< mSnappedBeforeVertex.toString().toLocal8Bit().data() << "." << std::endl;
#endif
twoBeforeVertexSqrDist = mSnappedAtGeometry.sqrDistToVertexAt(point, snappedTwoBeforeVertex);
beforeVertexSqrDist = mSnappedAtGeometry.sqrDistToVertexAt(point, mSnappedBeforeVertex);
#ifdef QGISDEBUG
std::cout << "QgsMapToolVertexEdit::snapVertexOfSnappedSegment: Choice of "
<< twoBeforeVertexSqrDist << " or "
<< beforeVertexSqrDist << "." << std::endl;
#endif
// See which of the two verticies is closer (i.e. smaller squared distance)
if (twoBeforeVertexSqrDist < beforeVertexSqrDist)
{
mSnappedAtVertex = snappedTwoBeforeVertex;
}
else
{
mSnappedAtVertex = mSnappedBeforeVertex;
}
#ifdef QGISDEBUG
std::cout << "QgsMapToolVertexEdit::snapVertexOfSnappedSegment: Chose "
<< mSnappedAtVertex.toString().toLocal8Bit().data() << "." << std::endl;
#endif
return TRUE;
}
bool QgsMapToolVertexEdit::snapVertex(QgsPoint& point, int exclFeatureId, int exclVertexNr)
{
QgsVectorLayer* vlayer = dynamic_cast<QgsVectorLayer*>(mCanvas->currentLayer());
if(vlayer)
{
QgsGeometryVertexIndex vIndex;
int snappedFeatureId;
int rbPoint1, rbPoint2;
QgsGeometry snappedGeometry;
//do the snapping to a copy point first
QgsPoint cpyPoint = point;
vlayer->snapVertexWithContext(cpyPoint, vIndex, rbPoint1, rbPoint2, snappedFeatureId, snappedGeometry, tolerance());
if(snappedFeatureId != exclFeatureId || vIndex.back() != exclVertexNr)
{
point = cpyPoint;
}
}
}
void QgsMapToolVertexEdit::canvasReleaseEvent(QMouseEvent * e)
{
if (mSnappedAtFeatureId == -1)
{
return;
}
QgsVectorLayer* vlayer = dynamic_cast<QgsVectorLayer*>(mCanvas->currentLayer());
if (!vlayer)
{
QMessageBox::information(0,"Not a vector layer","The current layer is not a vector layer",QMessageBox::Ok);
return;
}
if (!(vlayer->getDataProvider()->capabilities() & QgsVectorDataProvider::ChangeGeometries))
{
QMessageBox::information(0,"Change geometry",
"Data provider of the current layer doesn't allow changing geometries",
QMessageBox::Ok);
return;
}
if (!vlayer->isEditable())
{
QMessageBox::information(0,"Layer not editable",
"Cannot edit the vector layer. Use 'Start editing' in the legend item menu",
QMessageBox::Ok);
return;
}
QgsPoint point = toMapCoords(e->pos());
if (mTool == AddVertex)
{
//snap to nearest vertex of vectorlayer
snapVertex(point, mSnappedAtFeatureId, mSnappedBeforeVertex.back());
#ifdef QGISDEBUG
std::cout << "QgsMapToolVertexEdit::canvasReleaseEvent: AddVertex." << std::endl;
#endif
delete mRubberBand;
mRubberBand = 0;
// Add the new vertex
vlayer->insertVertexBefore(point.x(), point.y(), mSnappedAtFeatureId, mSnappedBeforeVertex);
mCanvas->refresh();
}
else if (mTool == MoveVertex)
{
//snap to nearest vertex of vectorlayer
snapVertex(point, mSnappedAtFeatureId, mSnappedAtVertex.back());
#ifdef QGISDEBUG
std::cout << "QgsMapToolVertexEdit::canvasReleaseEvent: MoveVertex." << std::endl;
#endif
delete mRubberBand;
mRubberBand = 0;
vlayer->moveVertexAt(point.x(), point.y(), mSnappedAtFeatureId, mSnappedAtVertex);
mCanvas->refresh();
}
else if (mTool == DeleteVertex)
{
#ifdef QGISDEBUG
std::cout << "QgsMapToolVertexEdit::canvasReleaseEvent: DeleteVertex." << std::endl;
#endif
delete mCross;
mCross = 0;
// delete vertex
vlayer->deleteVertexAt(mSnappedAtFeatureId, mSnappedAtVertex);
mCanvas->refresh();
}
}
void QgsMapToolVertexEdit::createRubberBand()
{
mRubberBand = new QgsRubberBand(mCanvas, FALSE);
QgsProject* project = QgsProject::instance();
QColor color( project->readNumEntry("Digitizing", "/LineColorRedPart", 255),
project->readNumEntry("Digitizing", "/LineColorGreenPart", 0),
project->readNumEntry("Digitizing", "/LineColorBluePart", 0));
mRubberBand->setColor(color);
mRubberBand->setWidth(project->readNumEntry("Digitizing", "/LineWidth", 1));
}
void QgsMapToolVertexEdit::deactivate()
{
delete mRubberBand;
mRubberBand = 0;
}
QgsPoint QgsMapToolVertexEdit::maybeInversePoint(QgsPoint point, const char whenmsg[])
{
QgsVectorLayer *vlayer = dynamic_cast <QgsVectorLayer*>(mCanvas->currentLayer());
QgsPoint transformedPoint;
if( mCanvas->projectionsEnabled() )
{
// Do reverse transformation before saving. If possible!
try
{
transformedPoint = vlayer->coordinateTransform()->transform(point, QgsCoordinateTransform::INVERSE);
}
catch(QgsCsException &cse)
{
//#ifdef QGISDEBUG
std::cout << "Caught transform error when " << whenmsg <<"."
<< "Setting untransformed values." << std::endl;
//#endif
// Transformation failed,. Bail out with original rectangle.
return point;
}
return transformedPoint;
}
return point;
}