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statistics: convert chart to QQuickItem

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It turns out that the wrong base class was used for the chart.
QQuickWidget can only be used on desktop, not in a mobile UI.

Therefore, turn this into a QQuickItem and move the container
QQuickWidget into desktop-only code.

Currently, this code is insane: The chart is rendered onto a
QGraphicsScene (as it was before), which is then rendered into
a QImage, which is transformed into a QSGTexture, which is then
projected onto the device. This is performed on every mouse
move event, since these events in general change the position
of the info-box.

The plan is to slowly convert elements such as the info-box into
QQuickItems. Browsing the QtQuick documentation, this will
not be much fun.

Also note that the rendering currently tears, flickers and has
antialiasing artifacts, most likely owing to integer (QImage)
to floating point (QGraphicsScene, QQuickItem) conversion
problems. The data flow is
QGraphicsScene (float) -> QImage (int) -> QQuickItem (float).

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2021-01-07 14:38:37 +01:00 • committed by Dirk Hohndel
parent f6b857b8fe
commit e7907c494f
32 changed files with 299 additions and 269 deletions
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12
stats/legend.cpp
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@ -4,8 +4,8 @@
#include "zvalues.h"
#include <QFontMetrics>
#include <QGraphicsScene>
#include <QGraphicsSceneMouseEvent>
#include <QGraphicsWidget>
#include <QPen>
static const double legendBorderSize = 2.0;
@ -16,8 +16,8 @@ static const double legendInternalBorderSize = 2.0;
static const QColor legendColor(0x00, 0x8e, 0xcc, 192); // Note: fourth argument is opacity
static const QColor legendBorderColor(Qt::black);
Legend::Legend(QGraphicsWidget *chart, const std::vector<QString> &names) :
RoundRectItem(legendBoxBorderRadius, chart), chart(chart),
Legend::Legend(const std::vector<QString> &names) :
RoundRectItem(legendBoxBorderRadius),
displayedItems(0), width(0.0), height(0.0)
{
setZValue(ZValues::legend);
@ -40,8 +40,6 @@ Legend::Legend(QGraphicsWidget *chart, const std::vector<QString> &names) :
}
setPen(QPen(legendBorderColor, legendBorderSize));
setBrush(QBrush(legendColor));
resize(); // Draw initial legend
}
Legend::Entry::Entry(const QString &name, int idx, int numBins, QGraphicsItem *parent) :
@ -70,7 +68,7 @@ void Legend::resize()
if (entries.empty())
return hide();
QSizeF size = chart->size();
QSizeF size = scene()->sceneRect().size();
// Silly heuristics: make the legend at most half as high and half as wide as the chart.
// Not sure if that makes sense - this might need some optimization.
@ -110,7 +108,7 @@ void Legend::updatePosition()
if (displayedItems <= 0)
return hide();
// For now, place the legend in the top right corner.
QPointF pos(chart->size().width() - width - 10.0, 10.0);
QPointF pos(scene()->sceneRect().width() - width - 10.0, 10.0);
setRect(QRectF(pos, QSizeF(width, height)));
for (int i = 0; i < displayedItems; ++i) {
QPointF itemPos = pos + entries[i].pos;