From de2fd29c3347e4c738f306c784b20382260c4bc9 2012-01-12 10:20:59 From: Jani Honkonen Date: 2012-01-12 10:20:59 Subject: [PATCH] Piechart drafting --- diff --git a/src/pie/main.cpp b/src/pie/main.cpp new file mode 100644 index 0000000..9e45e97 --- /dev/null +++ b/src/pie/main.cpp @@ -0,0 +1,168 @@ +#include +#include +#include + +class Slice : public QGraphicsItem +{ +public: + Slice(const QColor& color, qreal startAngle, qreal span) + :m_color(color), + m_startAngle(startAngle), + m_span(span) + { + setAcceptHoverEvents(true); + } + + ~Slice() + { + + } + + virtual QRectF boundingRect() const + { + return parentItem()->boundingRect(); + } + + QPainterPath shape() const + { + qreal angle = (-m_startAngle) + (90); + qreal span = -m_span; + + QPainterPath path; + path.moveTo(boundingRect().center()); + path.arcTo(boundingRect(), angle, span); + + // TODO: draw the shape so that it might have a hole in the center + // - Sin & Cos will be needed to find inner/outer arc endpoints + + // dx, dy are offsets from the center + //qreal l = boundingRect().height(); + //qreal dx = qSin(angle*(M_PI/180)) * l; + //qreal dy = qCos(angle*(M_PI/180)) * l; + + // TODO: exploded slice? + + return path; + } + + virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) + { + // Setup painter + painter->setBrush(m_color); + QPen pen; + //pen.setColor(m_color.darker()); + pen.setColor(Qt::gray); + pen.setWidth(1); + painter->setPen(pen); + + // From Qt docs: + // The startAngle and spanAngle must be specified in 1/16th of a degree, i.e. a full circle equals 5760 (16 * 360). + // Positive values for the angles mean counter-clockwise while negative values mean the clockwise direction. + // Zero degrees is at the 3 o'clock position. + // + // For sake of simplicity convert this so that zero degrees is at 12 o'clock and full circle is 360. + //qreal angle = (-m_startAngle*16) + (90*16); + //qreal span = -m_span*16; + //painter->drawPie(boundingRect(), angle, span); + + painter->drawPath(shape()); + } + + virtual void hoverEnterEvent( QGraphicsSceneHoverEvent * event) + { + QGraphicsItem::hoverEnterEvent(event); + qDebug() << "hover" << m_color << m_startAngle << m_span; + } + +private: + QColor m_color; + qreal m_startAngle; + qreal m_span; +}; + +class PieChart : public QGraphicsItem +{ +public: + PieChart() + { + qsrand(QTime::currentTime().msec()); + } + + ~PieChart() + { + + } + + QColor randomColor() + { + QColor c; + c.setRed(qrand() % 255); + c.setGreen(qrand() % 255); + c.setBlue(qrand() % 255); + return c; + } + + void setData(QList data) + { + qreal fullPie = 360; + + qreal total = 0; + foreach (qreal value, data) + total += value; + + qreal angle = 0; + foreach (qreal value, data) { + qreal span = value / total * fullPie; + Slice *slice = new Slice(randomColor(), angle, span); + slice->setParentItem(this); + m_slices.append(slice); + angle += span; + } + } + + virtual QRectF boundingRect() const + { + return QRectF(-200, -200, 200, 200); + } + + virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) + { + //painter->setBrush(Qt::red); + //painter->drawRect(boundingRect()); + } + +private: + QList m_slices; + QSizeF m_size; +}; + + +int main(int argc, char *argv[]) +{ + QApplication a(argc, argv); + + QGraphicsScene scene; + + PieChart *pieChart = new PieChart(); + scene.addItem(pieChart); + + QGraphicsView view(&scene); + view.setRenderHint(QPainter::Antialiasing); + view.resize(400, 300); + view.show(); + + QList data; + data << 1; + data << 2; + data << 3; + data << 20; + data << 2; + data << 3; + data << 10; + data << 2; + data << 1; + data << 5; + pieChart->setData(data); + + return a.exec(); +} diff --git a/src/pie/pie.pro b/src/pie/pie.pro new file mode 100644 index 0000000..97a82f4 --- /dev/null +++ b/src/pie/pie.pro @@ -0,0 +1,15 @@ +#------------------------------------------------- +# +# Project created by QtCreator 2012-01-11T14:41:14 +# +#------------------------------------------------- + +QT += core gui + +TARGET = pie +TEMPLATE = app + + +SOURCES += main.cpp + +HEADERS +=