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Code Issues Projects Releases Activity

Better handling of empty graphs

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This commit is contained in:
Martin Tůma 2016-08-30 08:39:14 +02:00
parent bf69ef58ba
commit 05f1536285
2 changed files with 33 additions and 11 deletions
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42
src/graphview.cpp
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@ -13,6 +13,7 @@
#define MARGIN 10.0
void Scene::mousePressEvent(QGraphicsSceneMouseEvent *e)
{
if (e->button() == Qt::LeftButton)
@ -39,11 +40,6 @@ GraphView::GraphView(QWidget *parent)
_sliderInfo->setZValue(2.0);
_info = new InfoItem();
_scene->addItem(_xAxis);
_scene->addItem(_yAxis);
_scene->addItem(_slider);
_scene->addItem(_info);
connect(_slider, SIGNAL(positionChanged(const QPointF&)), this,
SLOT(emitSliderPositionChanged(const QPointF&)));
connect(_scene, SIGNAL(mouseClicked(const QPointF&)), this,
@ -121,6 +117,18 @@ void GraphView::loadData(const QVector<QPointF> &data, int id)
}
}
void GraphView::removeItem(QGraphicsItem *item)
{
if (item->scene() == _scene)
_scene->removeItem(item);
}
void GraphView::addItem(QGraphicsItem *item)
{
if (item->scene() != _scene)
_scene->addItem(item);
}
void GraphView::showGraph(bool show, int id)
{
if (show)
@ -132,12 +140,10 @@ void GraphView::showGraph(bool show, int id)
_bounds = QRectF();
for (int i = 0; i < _graphs.count(); i++) {
GraphItem* gi = _graphs.at(i);
if (_hide.contains(gi->id())) {
if (gi->scene() == _scene)
_scene->removeItem(gi);
} else {
if (gi->scene() != _scene)
_scene->addItem(gi);
if (_hide.contains(gi->id()))
removeItem(gi);
else {
addItem(gi);
_visible.append(gi);
updateBounds(gi->path());
}
@ -175,6 +181,20 @@ void GraphView::redraw(const QSizeF &size)
qreal xs, ys;
if (_visible.isEmpty()) {
removeItem(_xAxis);
removeItem(_yAxis);
removeItem(_slider);
removeItem(_info);
_scene->setSceneRect(QRectF());
return;
}
addItem(_xAxis);
addItem(_yAxis);
addItem(_slider);
addItem(_info);
rx = RangeF(_bounds.left() * _xScale, _bounds.right() * _xScale);
ry = RangeF(_bounds.top() * _yScale + _yOffset, _bounds.bottom() * _yScale
+ _yOffset);

2
src/graphview.h
View File

@ -87,6 +87,8 @@ private:
void updateSliderInfo();
void updateBounds(const QPainterPath &path);
QRectF graphsBoundingRect() const;
void removeItem(QGraphicsItem *item);
void addItem(QGraphicsItem *item);
qreal _xScale, _yScale;
qreal _yOffset;