void GraphViewer::onSceneMouseRelease(QGraphicsSceneMouseEvent *mouseEvent)
{
// need to put the connecting line on the background otherwise it is detected under the mouse
_drawingEdge->setZValue(EDGE_LINE_Z);
QGraphicsItem * item = _scene.itemAt(mouseEvent->scenePos(), QTransform());
if (qgraphicsitem_cast<QGraphicsEllipseItem*>(item)
|| qgraphicsitem_cast<QGraphicsSimpleTextItem*>(item))
{
QGraphicsEllipseItem* vertex = qgraphicsitem_cast<QGraphicsEllipseItem*>(item->parentItem());
if (!vertex)
vertex = qgraphicsitem_cast<QGraphicsEllipseItem*>(item);
if (vertex)
{
double x = _drawingEdge->transform().dx();
double y = _drawingEdge->transform().dy();
_drawingEdge->setLine(0.0,0.0, vertex->scenePos().x()-x, vertex->scenePos().y()-y);
_drawingEdge->setZValue(EDGE_LINE_Z);
if (_drawingEdge->data(KEY_EDGE_VERTEX1) == vertex->data(KEY_EDGE_VERTEX1))
_scene.removeItem(_drawingEdge);
else
{
int defaultWeight = 1;
_drawingEdge->setData(KEY_EDGE_VERTEX2, vertex->data(KEY_VERTEX_ID));
_drawingEdge->setData(KEY_EDGE_WEIGHT, defaultWeight);
// draw edge weight
QGraphicsSimpleTextItem * edgeWeight = _scene.addSimpleText(QString("%1").arg(defaultWeight));
edgeWeight->setParentItem(_drawingEdge);
edgeWeight->setBrush(Qt::blue);
QLineF line = _drawingEdge->line();
edgeWeight->setTransform(
QTransform::fromScale(0.005, 0.005)
* QTransform::fromTranslate(line.x2()*0.5, line.y2()*0.5)
);
edgeWeight->setZValue(EDGE_TEXT_Z);
// add to graph edges
_edges << _drawingEdge;
}
}
}
else
{
_scene.removeItem(_drawingEdge);
}
_isDrawingEdge=false;
_drawingEdge=0;
}
void MyGraphicsView::mousePressEvent(QMouseEvent * event)
{
QPointF clickPos;
QGraphicsEllipseItem *lastPoint;
QGraphicsView::mousePressEvent(event);
if (this->isRoadDrawing)
{
if (event->button() == Qt::LeftButton) // add a road point
{
clickPos = this->mapToScene(event->pos());
if (!this->points.empty())
{
lastPoint = this->points.back();
this->lines.push_back(this->scene()->addLine(lastPoint->scenePos().x(), lastPoint->scenePos().y(), clickPos.x(), clickPos.y(), this->linePen));
}
this->points.push_back(this->scene()->addEllipse(-4, -4, 8, 8, this->nodePen, node));
this->points.back()->setPos(clickPos);
}
else if (event->button() == Qt::RightButton) // remove the last point
{
if (!this->points.empty())
{
this->scene()->removeItem(this->points.back());
this->points.pop_back();
if (!this->lines.empty())
{
this->scene()->removeItem(this->lines.back());
this->lines.pop_back();
}
}
}
}
}
void GraphViewer::onSceneMousePress(QGraphicsSceneMouseEvent *mouseEvent)
{
if (_vertices.isEmpty())
_initialText->setVisible(false);
if (_scene.items(QRectF(
mouseEvent->scenePos().x() - VERTEX_SIZE*0.5,
mouseEvent->scenePos().y() - VERTEX_SIZE*0.5,
VERTEX_SIZE,
VERTEX_SIZE)
).isEmpty())
{
// Create new vertex
QGraphicsEllipseItem * vertex = _scene.addEllipse(
QRectF(-VERTEX_SIZE*0.5, -VERTEX_SIZE*0.5, VERTEX_SIZE, VERTEX_SIZE),
QPen(Qt::black, 0),
QBrush(Qt::white)
);
vertex->setTransform(
QTransform::fromTranslate(mouseEvent->scenePos().x(), mouseEvent->scenePos().y())
);
vertex->setZValue(VERTEX_CIRCLE_Z);
_vertices << vertex;
int id = _vertices.size()-1;
vertex->setData(KEY_VERTEX_ID, id);
QGraphicsSimpleTextItem * vertexId = _scene.addSimpleText(QString("%1").arg(id+1));
vertexId->setParentItem(vertex);
vertexId->setTransform(
QTransform::fromScale(0.005, 0.005)
* QTransform::fromTranslate(-VERTEX_SIZE*( (id < 9) ? 0.18 : 0.28 ), -VERTEX_SIZE*0.35)
);
vertexId->setZValue(VERTEX_TEXT_Z);
}
else
{
// Propose to draw new edge
QGraphicsItem * item = _scene.itemAt(mouseEvent->scenePos(), QTransform());
if (qgraphicsitem_cast<QGraphicsEllipseItem*>(item)
|| qgraphicsitem_cast<QGraphicsSimpleTextItem*>(item))
{
QGraphicsEllipseItem* vertex = qgraphicsitem_cast<QGraphicsEllipseItem*>(item->parentItem());
if (!vertex)
vertex = qgraphicsitem_cast<QGraphicsEllipseItem*>(item);
if (vertex)
{
_isDrawingEdge=true;
_drawingEdge = _scene.addLine(0.0,
0.0,
mouseEvent->scenePos().x()-vertex->scenePos().x(),
mouseEvent->scenePos().y()-vertex->scenePos().y(),
QPen(Qt::black, 0));
_drawingEdge->setTransform(QTransform::fromTranslate(vertex->scenePos().x(), vertex->scenePos().y()));
_drawingEdge->setZValue(VERTEX_CIRCLE_Z);
_drawingEdge->setData(KEY_EDGE_VERTEX1, vertex->data(KEY_VERTEX_ID));
}
}
}
}
