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/****************************************************************************
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**
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** Copyright (C) 2012 Digia Plc
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** All rights reserved.
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** For any questions to Digia, please use contact form at http://qt.digia.com
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**
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** This file is part of the Qt Commercial Charts Add-on.
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**
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** $QT_BEGIN_LICENSE$
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia.
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**
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** If you have questions regarding the use of this file, please use
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** contact form at http://qt.digia.com
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "piesliceitem_p.h"
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#include "piechartitem_p.h"
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#include "qpieseries.h"
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#include "qpieslice.h"
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#include "chartpresenter_p.h"
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#include <QPainter>
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#include <qmath.h>
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#include <QGraphicsSceneEvent>
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#include <QTime>
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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#define PI 3.14159265 // TODO: is this defined in some header?
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QPointF offset(qreal angle, qreal length)
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{
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qreal dx = qSin(angle*(PI/180)) * length;
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qreal dy = qCos(angle*(PI/180)) * length;
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return QPointF(dx, -dy);
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}
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PieSliceItem::PieSliceItem(QGraphicsItem* parent)
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:QGraphicsObject(parent),
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m_hovered(false)
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{
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setAcceptHoverEvents(true);
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setAcceptedMouseButtons(Qt::MouseButtonMask);
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setZValue(ChartPresenter::PieSeriesZValue);
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}
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PieSliceItem::~PieSliceItem()
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{
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// If user is hovering over the slice and it gets destroyed we do
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// not get a hover leave event. So we must emit the signal here.
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if (m_hovered)
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emit hovered(false);
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}
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QRectF PieSliceItem::boundingRect() const
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{
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return m_boundingRect;
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}
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QPainterPath PieSliceItem::shape() const
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{
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// Don't include the label and label arm.
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// This is used to detect a mouse clicks. We do not want clicks from label.
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return m_slicePath;
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}
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void PieSliceItem::paint(QPainter* painter, const QStyleOptionGraphicsItem* /*option*/, QWidget* /*widget*/)
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{
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painter->save();
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painter->setClipRect(parentItem()->boundingRect());
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painter->setPen(m_data.m_slicePen);
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painter->setBrush(m_data.m_sliceBrush);
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painter->drawPath(m_slicePath);
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painter->restore();
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if (m_data.m_isLabelVisible) {
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painter->setClipRect(parentItem()->boundingRect());
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painter->setPen(m_data.m_labelPen);
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painter->drawPath(m_labelArmPath);
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// the pen color will affect the font color as well
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painter->setFont(m_data.m_labelFont);
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painter->drawText(m_labelTextRect.bottomLeft(), m_data.m_labelText);
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}
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}
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void PieSliceItem::hoverEnterEvent(QGraphicsSceneHoverEvent* /*event*/)
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{
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m_hovered = true;
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emit hovered(true);
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}
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void PieSliceItem::hoverLeaveEvent(QGraphicsSceneHoverEvent* /*event*/)
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{
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m_hovered = false;
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emit hovered(false);
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}
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void PieSliceItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
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{
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emit clicked(event->buttons());
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}
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void PieSliceItem::setLayout(const PieSliceData &sliceData)
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{
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m_data = sliceData;
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updateGeometry();
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update();
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}
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void PieSliceItem::updateGeometry()
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{
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if (m_data.m_radius <= 0)
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return;
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prepareGeometryChange();
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// update slice path
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qreal centerAngle;
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QPointF armStart;
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m_slicePath = slicePath(m_data.m_center, m_data.m_radius, m_data.m_startAngle, m_data.m_angleSpan, ¢erAngle, &armStart);
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// update text rect
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m_labelTextRect = labelTextRect(m_data.m_labelFont, m_data.m_labelText);
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// update label arm path
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QPointF labelTextStart;
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m_labelArmPath = labelArmPath(armStart, centerAngle, m_data.m_radius * m_data.m_labelArmLengthFactor, m_labelTextRect.width(), &labelTextStart);
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// update text position
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m_labelTextRect.moveBottomLeft(labelTextStart);
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// update bounding rect
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if (m_data.m_isLabelVisible)
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m_boundingRect = m_slicePath.boundingRect().united(m_labelArmPath.boundingRect()).united(m_labelTextRect);
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else
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m_boundingRect = m_slicePath.boundingRect();
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}
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QPointF PieSliceItem::sliceCenter(QPointF point, qreal radius, QPieSlice *slice)
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{
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if (slice->isExploded()) {
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qreal centerAngle = slice->startAngle() + ((slice->endAngle() - slice->startAngle())/2);
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qreal len = radius * slice->explodeDistanceFactor();
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qreal dx = qSin(centerAngle*(PI/180)) * len;
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qreal dy = -qCos(centerAngle*(PI/180)) * len;
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point += QPointF(dx, dy);
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}
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return point;
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}
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QPainterPath PieSliceItem::slicePath(QPointF center, qreal radius, qreal startAngle, qreal angleSpan, qreal *centerAngle, QPointF* armStart)
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{
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// calculate center angle
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*centerAngle = startAngle + (angleSpan/2);
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// calculate slice rectangle
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QRectF rect(center.x()-radius, center.y()-radius, radius*2, radius*2);
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// slice path
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// TODO: draw the shape so that it might have a hole in the center
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QPainterPath path;
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path.moveTo(rect.center());
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path.arcTo(rect, -startAngle + 90, -angleSpan);
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path.closeSubpath();
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// calculate label arm start point
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*armStart = center;
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*armStart += offset(*centerAngle, radius + PIESLICE_LABEL_GAP);
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return path;
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}
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QPainterPath PieSliceItem::labelArmPath(QPointF start, qreal angle, qreal length, qreal textWidth, QPointF *textStart)
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{
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// prevent label arm pointing straight down because it will look bad
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if (angle < 180 && angle > 170)
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angle = 170;
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if (angle > 180 && angle < 190)
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angle = 190;
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// line from slice to label
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qreal dx = qSin(angle*(PI/180)) * length;
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qreal dy = -qCos(angle*(PI/180)) * length;
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QPointF parm1 = start + QPointF(dx, dy);
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// line to underline the label
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QPointF parm2 = parm1;
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if (angle < 180) { // arm swings the other way on the left side
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parm2 += QPointF(textWidth, 0);
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*textStart = parm1;
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}
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else {
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parm2 += QPointF(-textWidth,0);
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*textStart = parm2;
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}
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// elevate the text position a bit so that it does not hit the line
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*textStart += QPointF(0, -3);
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QPainterPath path;
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path.moveTo(start);
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path.lineTo(parm1);
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path.lineTo(parm2);
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return path;
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}
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QRectF PieSliceItem::labelTextRect(QFont font, QString text)
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{
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QFontMetricsF fm(font);
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return fm.boundingRect(text);
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}
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#include "moc_piesliceitem_p.cpp"
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QTCOMMERCIALCHART_END_NAMESPACE
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