From d24f813f3f2a05c112e803e4256b53535895fc98 Mon Sep 17 00:00:00 2001
From: Jedidiah Barber <contact@jedbarber.id.au>
Date: Wed, 14 Jul 2021 11:49:10 +1200
Subject: Initial mirror commit

---
 src/charts/PieRound.cpp | 77 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 src/charts/PieRound.cpp

(limited to 'src/charts/PieRound.cpp')

diff --git a/src/charts/PieRound.cpp b/src/charts/PieRound.cpp
new file mode 100644
index 0000000..f90d740
--- /dev/null
+++ b/src/charts/PieRound.cpp
@@ -0,0 +1,77 @@
+#include "PieRound.h"
+#include "PieChartScene.h"
+
+PieRound::PieRound(const QPointF& center, const PieChartScene* scene):
+    scene(scene)
+{
+    setPos(center);
+    calculateSum();
+    addSectors();
+}
+
+QRectF PieRound::boundingRect() const
+{
+    return QRectF(-Radius, -Radius, 2 * Radius, 2 * Radius);
+}
+
+void PieRound::calculateSum()
+{
+    sum = 0;
+    foreach(DataPoint point, scene->getDataSet())
+        sum += point.value;
+}
+
+void PieRound::addSectors()
+{
+    qreal angle = -90;
+    for(int i = 0; i < scene->getDataSet().size(); i++)
+    {
+        qreal sweep = 360. * scene->getDataSet()[i].value / sum;
+        addSector(i, angle, sweep);
+        angle += sweep;
+    }
+}
+
+void PieRound::addSector(int index, qreal startAngle, qreal sweep)
+{
+    addSectorItem(createSectorPath(startAngle, sweep),
+            QColor(scene->getColors()[index]));
+    addSectorLabel(index, startAngle, sweep);
+}
+
+QPainterPath PieRound::createSectorPath(qreal startAngle, qreal sweep)
+{
+    QPainterPath sectorPath;
+    sectorPath.arcTo(boundingRect(), -startAngle, -sweep);
+    sectorPath.lineTo(QPointF());
+    return sectorPath;
+}
+
+void PieRound::addSectorItem(const QPainterPath& path, QColor color)
+{
+    QGraphicsPathItem* sectorItem = new QGraphicsPathItem(path, this);
+    sectorItem->setPen(QColor("white"));
+    sectorItem->setBrush(color);
+}
+
+void PieRound::addSectorLabel(int index, qreal startAngle, qreal sweep)
+{
+    int value = scene->getDataSet()[index].value;
+    if(value == 0)
+        return;
+    QGraphicsSimpleTextItem* labelItem =
+            new QGraphicsSimpleTextItem(QString::number(value), this);
+    labelItem->setPos(getLabelPos(startAngle, sweep, labelItem));
+}
+
+QPointF PieRound::getLabelPos(qreal startAngle, qreal sweep,
+        QGraphicsSimpleTextItem* labelItem)
+{
+    int radius = sweep > 30 ? LabelRadius : 2 * LabelRadius;
+    QRectF labelArcRect(-radius, -radius, 2 * radius, 2 * radius);
+    QPainterPath path;
+    path.arcMoveTo(labelArcRect, -startAngle - sweep / 2);
+    QSizeF labelSize = labelItem->boundingRect().size();
+    return path.currentPosition() -
+            QPointF(labelSize.width() / 2, labelSize.height() / 2);
+}
-- 
cgit