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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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3
stats/legend.cpp
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@ -15,7 +15,8 @@ static const QColor legendColor(0x00, 0x8e, 0xcc, 192); // Note: fourth argument
static const QColor legendBorderColor(Qt::black);
Legend::Legend(StatsView &view, const std::vector<QString> &names) :
ChartRectItem(view, QPen(legendBorderColor, legendBorderSize), QBrush(legendColor), legendBoxBorderRadius),
ChartRectItem(view, ChartZValue::Legend,
QPen(legendBorderColor, legendBorderSize), QBrush(legendColor), legendBoxBorderRadius),
displayedItems(0), width(0.0), height(0.0),
font(QFont()) // Make configurable
{