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statistics: replace PieSeries by QSG nodes

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Since there are no disk-segment QSG primitives (one could draw
a triangle fan, but that doesn't seem optimal), this draws
into a pixmap and blits that as a QSG node.

Since this is the only series without axis, it needs a function
that returns the size of the plot area. This didn't exist, so
add it.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2021-01-18 12:08:46 +01:00 • committed by bstoeger
parent b07a7fe5f1
commit b068b2b0e7
6 changed files with 92 additions and 50 deletions
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30
stats/chartitem.cpp
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@ -224,6 +224,11 @@ ChartTextItem::ChartTextItem(StatsView &v, ChartZValue z, const QFont &f, const
resize(QSizeF(totalWidth, totalHeight));
}
ChartTextItem::ChartTextItem(StatsView &v, ChartZValue z, const QFont &f, const QString &text) :
ChartTextItem(v, z, f, std::vector<QString>({ text }), true)
{
}
void ChartTextItem::setColor(const QColor &c)
{
img->fill(Qt::transparent);
@ -240,6 +245,31 @@ void ChartTextItem::setColor(const QColor &c)
setTextureDirty();
}
ChartPieItem::ChartPieItem(StatsView &v, ChartZValue z, double borderWidth) : ChartPixmapItem(v, z),
borderWidth(borderWidth)
{
}
void ChartPieItem::drawSegment(double from, double to, QColor fill, QColor border)
{
painter->setPen(QPen(border, borderWidth));
painter->setBrush(QBrush(fill));
// For whatever obscure reason, angles of pie pieces are given as 16th of a degree...?
// Angles increase CCW, whereas pie charts usually are read CW. Therfore, startAngle
// is dervied from "from" and subtracted from the origin angle at 12:00.
int startAngle = 90 * 16 - static_cast<int>(round(to * 360.0 * 16.0));
int spanAngle = static_cast<int>(round((to - from) * 360.0 * 16.0));
QRectF drawRect(QPointF(0.0, 0.0), rect.size());
painter->drawPie(drawRect, startAngle, spanAngle);
setTextureDirty();
}
void ChartPieItem::resize(QSizeF size)
{
ChartPixmapItem::resize(size);
img->fill(Qt::transparent);
}
ChartLineItem::ChartLineItem(StatsView &v, ChartZValue z, QColor color, double width) : HideableChartItem(v, z),
color(color), width(width), positionDirty(false), materialDirty(false)
{