pieslice.cpp
91 lines
| 2.6 KiB
| text/x-c
|
CppLexer
Tero Ahola
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r51 | #include "pieslice.h" | ||
Jani Honkonen
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r142 | #include "piepresentation.h" | ||
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Tero Ahola
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r51 | #include <QPainter> | ||
| #include <QDebug> | ||||
| QTCOMMERCIALCHART_BEGIN_NAMESPACE | ||||
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Jani Honkonen
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r142 | PieSlice::PieSlice(PiePresentation *piePresentation, int seriesIndex, qreal startAngle, qreal span) | ||
| :QGraphicsItem(piePresentation), | ||||
| m_seriesIndex(seriesIndex), | ||||
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Tero Ahola
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r51 | m_startAngle(startAngle), | ||
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Jani Honkonen
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r142 | m_span(span) | ||
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Tero Ahola
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r51 | { | ||
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Jani Honkonen
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r142 | Q_ASSERT(piePresentation); | ||
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Tero Ahola
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r51 | setAcceptHoverEvents(true); | ||
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Jani Honkonen
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r142 | setAcceptedMouseButtons(Qt::LeftButton); | ||
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Tero Ahola
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r51 | } | ||
| PieSlice::~PieSlice() | ||||
| { | ||||
| } | ||||
| QRectF PieSlice::boundingRect() const | ||||
| { | ||||
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Jani Honkonen
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r142 | return shape().boundingRect(); | ||
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Tero Ahola
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r51 | } | ||
| QPainterPath PieSlice::shape() const | ||||
| { | ||||
|
Jani Honkonen
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r142 | QRectF rect = (static_cast<PiePresentation*>(parentItem()))->pieRect(); | ||
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Tero Ahola
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r51 | qreal angle = (-m_startAngle) + (90); | ||
| qreal span = -m_span; | ||||
| QPainterPath path; | ||||
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Jani Honkonen
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r142 | path.moveTo(rect.center()); | ||
| path.arcTo(rect, angle, span); | ||||
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Tero Ahola
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r51 | |||
| // 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; | ||||
| } | ||||
|
Jani Honkonen
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r142 | void PieSlice::paint(QPainter* painter, const QStyleOptionGraphicsItem* /*option*/, QWidget* /*widget*/) | ||
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Tero Ahola
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r51 | { | ||
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Tero Ahola
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r77 | painter->setRenderHint(QPainter::Antialiasing); | ||
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Tero Ahola
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r108 | // TODO: how to map theme settings to a pie slice? Now we | ||
| //painter->setPen(m_theme.linePen); | ||||
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Tero Ahola
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r103 | // TODO: | ||
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Jani Honkonen
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r142 | |||
| QPieSlice data = (static_cast<PiePresentation*>(parentItem()))->m_pieSeries->slice(m_seriesIndex); | ||||
| painter->setBrush(data.m_color); | ||||
Michal Klocek
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r143 | |||
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Jani Honkonen
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r142 | //painter->setBrush(m_theme.linePen.color()); | ||
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Tero Ahola
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r51 | |||
| // 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()); | ||||
|
Jani Honkonen
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r142 | |||
| // Draw the label | ||||
| // TODO: do this better | ||||
| painter->drawText(boundingRect().center(), data.m_label); | ||||
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Tero Ahola
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r51 | } | ||
| void PieSlice::hoverEnterEvent(QGraphicsSceneHoverEvent * event) | ||||
| { | ||||
| QGraphicsItem::hoverEnterEvent(event); | ||||
|
Jani Honkonen
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r142 | qDebug() << "hover" << m_seriesIndex << m_startAngle << m_span; | ||
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Tero Ahola
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r51 | } | ||
|
Jani Honkonen
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r142 | void PieSlice::mousePressEvent(QGraphicsSceneMouseEvent *event) | ||
| { | ||||
| QGraphicsItem::mousePressEvent(event); | ||||
| } | ||||
|
Tero Ahola
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r51 | QTCOMMERCIALCHART_END_NAMESPACE | ||