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statistics: convert box-and-whiskers plot to QSG

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This is lazy: Derive from the bar chart item and add whiskers
in the subclassed render() function. The code is ugly, because
the base class function clears the dirty flags and therefore
the derived class has to remember them. Oh well.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2021-01-17 21:07:57 +01:00 • committed by bstoeger
parent 5d5ebfcf3c
commit 409f159e1d
4 changed files with 117 additions and 56 deletions
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74
stats/chartitem.cpp
View file

@ -279,3 +279,77 @@ QRectF ChartBarItem::getRect() const
{
return rect;
}
ChartBoxItem::ChartBoxItem(StatsView &v, ChartZValue z, double borderWidth) :
ChartBarItem(v, z, borderWidth, false) // Only support for vertical boxes
{
}
ChartBoxItem::~ChartBoxItem()
{
}
void ChartBoxItem::render()
{
// Remember old dirty values, since ChartBarItem::render() will clear them
bool oldPositionDirty = positionDirty;
bool oldColorDirty = colorDirty;
ChartBarItem::render(); // This will create the base node, so no need to check for that.
if (!whiskersNode) {
whiskersGeometry.reset(new QSGGeometry(QSGGeometry::defaultAttributes_Point2D(), 10));
whiskersGeometry->setDrawingMode(QSGGeometry::DrawLines);
whiskersGeometry->setLineWidth(static_cast<float>(borderWidth));
whiskersMaterial.reset(new QSGFlatColorMaterial);
whiskersNode.reset(new QSGGeometryNode);
whiskersNode->setGeometry(whiskersGeometry.get());
whiskersNode->setMaterial(whiskersMaterial.get());
node->node->appendChildNode(whiskersNode.get());
// If this is the first time, make sure to update the geometry.
oldPositionDirty = oldColorDirty = true;
}
if (oldColorDirty) {
whiskersMaterial->setColor(borderColor);
whiskersNode->markDirty(QSGNode::DirtyMaterial);
}
if (oldPositionDirty) {
auto vertices = whiskersGeometry->vertexDataAsPoint2D();
double left = rect.left();
double right = rect.right();
double mid = (left + right) / 2.0;
// top bar
setPoint(vertices[0], QPointF(left, max));
setPoint(vertices[1], QPointF(right, max));
// top whisker
setPoint(vertices[2], QPointF(mid, max));
setPoint(vertices[3], QPointF(mid, rect.top()));
// bottom bar
setPoint(vertices[4], QPointF(left, min));
setPoint(vertices[5], QPointF(right, min));
// bottom whisker
setPoint(vertices[6], QPointF(mid, min));
setPoint(vertices[7], QPointF(mid, rect.bottom()));
// median indicator
setPoint(vertices[8], QPointF(left, median));
setPoint(vertices[9], QPointF(right, median));
whiskersNode->markDirty(QSGNode::DirtyGeometry);
}
}
void ChartBoxItem::setBox(const QRectF &rect, double minIn, double maxIn, double medianIn)
{
min = minIn;
max = maxIn;
median = medianIn;
setRect(rect);
}
QRectF ChartBoxItem::getRect() const
{
QRectF res = rect;
res.setTop(min);
res.setBottom(max);
return rect;
}