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statistics: turn ChartGrid into QSGNodes

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Turn the background grid into QSGNodes. Each grid line is
represented by a QSG line item. An alternative would be
drawing the grid into a QImage and blasting that onto the
screen. It is unclear which one is preferred.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2021-01-14 12:37:26 +01:00 • committed by bstoeger
parent c74975632e
commit 9b7565e81a
4 changed files with 17 additions and 20 deletions
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1
desktop-widgets/statswidget.h
View file

@ -33,7 +33,6 @@ private:
std::vector<std::unique_ptr<QCheckBox>> features;
ChartListModel charts;
//QStringListModel charts;
void showEvent(QShowEvent *) override;
};

23
stats/statsgrid.cpp
View file

@ -1,17 +1,15 @@
// SPDX-License-Identifier: GPL-2.0
#include "statsgrid.h"
#include "chartitem.h"
#include "statsaxis.h"
#include "statscolors.h"
#include "statshelper.h"
#include "statsview.h"
#include "zvalues.h"
#include <QGraphicsLineItem>
static const double gridWidth = 1.0;
static const Qt::PenStyle gridStyle = Qt::SolidLine;
StatsGrid::StatsGrid(QGraphicsScene *scene, const StatsAxis &xAxis, const StatsAxis &yAxis)
: scene(scene), xAxis(xAxis), yAxis(yAxis)
StatsGrid::StatsGrid(StatsView &view, const StatsAxis &xAxis, const StatsAxis &yAxis)
: view(view), xAxis(xAxis), yAxis(yAxis)
{
}
@ -19,18 +17,19 @@ void StatsGrid::updatePositions()
{
std::vector<double> xtics = xAxis.ticksPositions();
std::vector<double> ytics = yAxis.ticksPositions();
// We probably should be smarter and reuse existing lines.
// For now, this does it.
lines.clear();
if (xtics.empty() || ytics.empty())
return;
for (double x: xtics) {
lines.emplace_back(createItem<QGraphicsLineItem>(scene, x, ytics.front(), x, ytics.back()));
lines.back()->setPen(QPen(gridColor, gridWidth, gridStyle));
lines.back()->setZValue(ZValues::grid);
lines.push_back(view.createChartItem<ChartLineItem>(ChartZValue::Grid, gridColor, gridWidth));
lines.back()->setLine(QPointF(x, ytics.front()), QPointF(x, ytics.back()));
}
for (double y: ytics) {
lines.emplace_back(createItem<QGraphicsLineItem>(scene, xtics.front(), y, xtics.back(), y));
lines.back()->setPen(QPen(gridColor, gridWidth, gridStyle));
lines.back()->setZValue(ZValues::grid);
lines.push_back(view.createChartItem<ChartLineItem>(ChartZValue::Grid, gridColor, gridWidth));
lines.back()->setLine(QPointF(xtics.front(), y), QPointF(xtics.back(), y));
}
}

11
stats/statsgrid.h
View file

@ -3,18 +3,17 @@
#include <memory>
#include <vector>
#include <QVector>
#include <QGraphicsLineItem>
class StatsAxis;
class QGraphicsScene;
class StatsView;
class ChartLineItem;
class StatsGrid {
public:
StatsGrid(QGraphicsScene *scene, const StatsAxis &xAxis, const StatsAxis &yAxis);
StatsGrid(StatsView &view, const StatsAxis &xAxis, const StatsAxis &yAxis);
void updatePositions();
private:
QGraphicsScene *scene;
StatsView &view;
const StatsAxis &xAxis, &yAxis;
std::vector<std::unique_ptr<QGraphicsLineItem>> lines;
std::vector<std::unique_ptr<ChartLineItem>> lines;
};

2
stats/statsview.cpp
View file

@ -317,7 +317,7 @@ void StatsView::setAxes(StatsAxis *x, StatsAxis *y)
xAxis = x;
yAxis = y;
if (x && y)
grid = std::make_unique<StatsGrid>(&scene, *x, *y);
grid = std::make_unique<StatsGrid>(*this, *x, *y);
}
void StatsView::reset()