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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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77
stats/pieseries.cpp
View file

@ -9,7 +9,6 @@
#include <numeric>
#include <math.h>
#include <QGraphicsEllipseItem>
#include <QLocale>
static const double pieSize = 0.9; // 1.0 = occupy full width of chart
@ -17,20 +16,15 @@ static const double pieBorderWidth = 1.0;
static const double innerLabelRadius = 0.75; // 1.0 = at outer border of pie
static const double outerLabelRadius = 1.01; // 1.0 = at outer border of pie
PieSeries::Item::Item(QGraphicsScene *scene, const QString &name, int from, int count, int totalCount,
PieSeries::Item::Item(StatsView &view, const QString &name, int from, int count, int totalCount,
int bin_nr, int numBins, bool labels) :
item(createItemPtr<QGraphicsEllipseItem>(scene)),
name(name),
count(count)
{
QFont f; // make configurable
QLocale loc;
// For whatever obscure reason, angles in QGraphicsEllipseItem are given as 16th of a degree...?
// Angles increase CCW, whereas pie charts usually are read CW.
item->setStartAngle(90 * 16 - (from + count) * 360 * 16 / totalCount);
item->setSpanAngle(count * 360 * 16 / totalCount);
item->setPen(QPen(::borderColor));
item->setZValue(ZValues::series);
angleFrom = static_cast<double>(from) / totalCount;
angleTo = static_cast<double>(from + count) / totalCount;
double meanAngle = M_PI / 2.0 - (from + count / 2.0) / totalCount * M_PI * 2.0; // Note: "-" because we go CW.
innerLabelPos = QPointF(cos(meanAngle) * innerLabelRadius, -sin(meanAngle) * innerLabelRadius);
@ -39,27 +33,24 @@ PieSeries::Item::Item(QGraphicsScene *scene, const QString &name, int from, int
if (labels) {
double percentage = count * 100.0 / totalCount;
QString innerLabelText = QStringLiteral("%1\%").arg(loc.toString(percentage, 'f', 1));
innerLabel = createItemPtr<QGraphicsSimpleTextItem>(scene, innerLabelText);
innerLabel->setZValue(ZValues::seriesLabels);
innerLabel = view.createChartItem<ChartTextItem>(ChartZValue::SeriesLabels, f, innerLabelText);
outerLabel = createItemPtr<QGraphicsSimpleTextItem>(scene, name);
outerLabel->setBrush(QBrush(darkLabelColor));
outerLabel->setZValue(ZValues::seriesLabels);
outerLabel = view.createChartItem<ChartTextItem>(ChartZValue::SeriesLabels, f, name);
outerLabel->setColor(darkLabelColor);
}
highlight(bin_nr, false, numBins);
}
void PieSeries::Item::updatePositions(const QRectF &rect, const QPointF &center, double radius)
void PieSeries::Item::updatePositions(const QPointF &center, double radius)
{
item->setRect(rect);
// Note: the positions in this functions are rounded to integer values,
// because half-integer values gives horrible aliasing artifacts.
if (innerLabel) {
QRectF labelRect = innerLabel->boundingRect();
innerLabel->setPos(center.x() + innerLabelPos.x() * radius - labelRect.width() / 2.0,
center.y() + innerLabelPos.y() * radius - labelRect.height() / 2.0);
QRectF labelRect = innerLabel->getRect();
innerLabel->setPos(QPointF(round(center.x() + innerLabelPos.x() * radius - labelRect.width() / 2.0),
round(center.y() + innerLabelPos.y() * radius - labelRect.height() / 2.0)));
}
if (outerLabel) {
QRectF labelRect = outerLabel->boundingRect();
QRectF labelRect = outerLabel->getRect();
QPointF pos(center.x() + outerLabelPos.x() * radius, center.y() + outerLabelPos.y() * radius);
if (outerLabelPos.x() < 0.0) {
if (outerLabelPos.y() < 0.0)
@ -70,25 +61,23 @@ void PieSeries::Item::updatePositions(const QRectF &rect, const QPointF &center,
pos.ry() -= labelRect.height();
}
outerLabel->setPos(pos);
outerLabel->setPos(QPointF(round(pos.x()), round(pos.y())));
}
}
void PieSeries::Item::highlight(int bin_nr, bool highlight, int numBins)
void PieSeries::Item::highlight(ChartPieItem &item, int bin_nr, bool highlight, int numBins)
{
QBrush brush(highlight ? highlightedColor : binColor(bin_nr, numBins));
QPen pen(highlight ? highlightedBorderColor : ::borderColor, pieBorderWidth);
item->setBrush(brush);
item->setPen(pen);
if (innerLabel) {
QBrush labelBrush(highlight ? darkLabelColor : labelColor(bin_nr, numBins));
innerLabel->setBrush(labelBrush);
}
if (innerLabel)
innerLabel->setColor(highlight ? darkLabelColor : labelColor(bin_nr, numBins));
item.drawSegment(angleFrom, angleTo,
highlight ? highlightedColor : binColor(bin_nr, numBins),
highlight ? highlightedBorderColor : ::borderColor);
}
PieSeries::PieSeries(QGraphicsScene *scene, StatsView &view, StatsAxis *xAxis, StatsAxis *yAxis, const QString &categoryName,
const std::vector<std::pair<QString, int>> &data, bool keepOrder, bool labels) :
StatsSeries(scene, view, xAxis, yAxis),
item(view.createChartItem<ChartPieItem>(ChartZValue::Series, pieBorderWidth)),
categoryName(categoryName),
highlighted(-1)
{
@ -148,7 +137,7 @@ PieSeries::PieSeries(QGraphicsScene *scene, StatsView &view, StatsAxis *xAxis, S
int act = 0;
for (auto it2 = sorted.begin(); it2 != it; ++it2) {
int count = data[*it2].second;
items.emplace_back(scene, data[*it2].first, act, count, totalCount, (int)items.size(), numBins, labels);
items.emplace_back(view, data[*it2].first, act, count, totalCount, (int)items.size(), numBins, labels);
act += count;
}
@ -158,7 +147,7 @@ PieSeries::PieSeries(QGraphicsScene *scene, StatsView &view, StatsAxis *xAxis, S
for (auto it2 = it; it2 != sorted.end(); ++it2)
other.push_back({ data[*it2].first, data[*it2].second });
QString name = StatsTranslations::tr("other (%1 items)").arg(other.size());
items.emplace_back(scene, name, act, totalCount - act, totalCount, (int)items.size(), numBins, labels);
items.emplace_back(view, name, act, totalCount - act, totalCount, (int)items.size(), numBins, labels);
}
}
@ -168,12 +157,18 @@ PieSeries::~PieSeries()
void PieSeries::updatePositions()
{
QRectF plotRect = scene->sceneRect();
QRectF plotRect = view.plotArea();
center = plotRect.center();
radius = std::min(plotRect.width(), plotRect.height()) * pieSize / 2.0;
QRectF rect(center.x() - radius, center.y() - radius, 2.0 * radius, 2.0 * radius);
for (Item &item: items)
item.updatePositions(rect, center, radius);
radius = ceil(std::min(plotRect.width(), plotRect.height()) * pieSize / 2.0);
QRectF rect(round(center.x() - radius), round(center.y() - radius), ceil(2.0 * radius), ceil(2.0 * radius));
item->resize(rect.size());
item->setPos(rect.topLeft());
int i = 0;
for (Item &segment: items) {
segment.updatePositions(center, radius);
segment.highlight(*item, i, i == highlighted, (int)items.size()); // Draw segment
++i;
}
}
std::vector<QString> PieSeries::binNames()
@ -245,7 +240,7 @@ bool PieSeries::hover(QPointF pos)
// Highlight new item (if any)
if (highlighted >= 0 && highlighted < (int)items.size()) {
items[highlighted].highlight(highlighted, true, (int)items.size());
items[highlighted].highlight(*item, highlighted, true, (int)items.size());
if (!information)
information = view.createChartItem<InformationBox>();
information->setText(makeInfo(highlighted), pos);
@ -258,6 +253,6 @@ bool PieSeries::hover(QPointF pos)
void PieSeries::unhighlight()
{
if (highlighted >= 0 && highlighted < (int)items.size())
items[highlighted].highlight(highlighted, false, (int)items.size());
items[highlighted].highlight(*item, highlighted, false, (int)items.size());
highlighted = -1;
}