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statistics: add notion of Z-value to chart items

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The chart items were drawn in order of creation. To control this,
add a notion of Z-value. In contrast to QGraphicsScene, make
this a small integer value.

To controll order of drawing, a plain QSGNode is created for
every possible Z-Value and items are added to these nodes.
Thus, items are rendered by Z-value and if the Z-value is equal
by order of creation.

Likewise split the list of chart-items into Z-values, so that
items can be quickly unregistered: The items that will be
removed individually will usuall be part of Z-levels with only
few items (e.g. legend, infobox). Z-levels with many items
(notably the series) will always be fully rebuilt.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2021-01-13 16:19:27 +01:00 • committed by bstoeger
parent 785d5189f6
commit e1c0cace95
7 changed files with 82 additions and 31 deletions
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9
stats/chartitem.cpp
View file

@ -12,8 +12,8 @@ static int round_up(double f)
return static_cast<int>(ceil(f));
}
ChartItem::ChartItem(StatsView &v) :
dirty(false), view(v), positionDirty(false), textureDirty(false)
ChartItem::ChartItem(StatsView &v, ChartZValue z) :
dirty(false), zValue(z), view(v), positionDirty(false), textureDirty(false)
{
}
@ -46,7 +46,7 @@ void ChartItem::render()
return;
if (!node) {
node.reset(view.w()->createImageNode());
view.addQSGNode(node.get(), 0);
view.addQSGNode(node.get(), zValue);
}
if (!img) {
resize(QSizeF(1,1));
@ -85,7 +85,8 @@ QRectF ChartItem::getRect() const
return rect;
}
ChartRectItem::ChartRectItem(StatsView &v, const QPen &pen, const QBrush &brush, double radius) : ChartItem(v),
ChartRectItem::ChartRectItem(StatsView &v, ChartZValue z,
const QPen &pen, const QBrush &brush, double radius) : ChartItem(v, z),
pen(pen), brush(brush), radius(radius)
{
}