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/****************************************************************************
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**
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** Copyright (C) 2013 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 Enterprise Charts Add-on.
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**
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** $QT_BEGIN_LICENSE$
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** Licensees holding valid Qt Enterprise licenses may use this file in
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** accordance with the Qt Enterprise 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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#include <QDebug>
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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QPointF offset(qreal angle, qreal length)
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{
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qreal dx = qSin(angle * (M_PI / 180)) * length;
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qreal dy = qCos(angle * (M_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->save();
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// Pen for label arm not defined in the QPieSeries api, let's use brush's color instead
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// Also, the drawText actually uses the pen color for the text color (unlike QGraphicsSimpleTextItem)
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painter->setPen(m_data.m_labelBrush.color());
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painter->setBrush(m_data.m_labelBrush);
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painter->setFont(m_data.m_labelFont);
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QFontMetricsF fm(m_data.m_labelFont);
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QString label = m_data.m_labelText;
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QRectF labelBoundingRect;
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switch (m_data.m_labelPosition) {
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case QPieSlice::LabelOutside:
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painter->setClipRect(parentItem()->boundingRect());
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painter->strokePath(m_labelArmPath, m_data.m_labelBrush.color());
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if (fm.width(m_data.m_labelText) > m_labelTextRect.width()) {
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// Only one line label text is supported currently.
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// The height for the label is set one pixel over the font metrics.
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label = ChartPresenter::truncatedText(m_data.m_labelFont, m_data.m_labelText,
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qreal(0.0), m_labelTextRect.width(),
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fm.height() + 1.0, labelBoundingRect);
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}
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painter->drawText(m_labelTextRect, Qt::AlignCenter, label);
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break;
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case QPieSlice::LabelInsideHorizontal:
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painter->setClipPath(m_slicePath);
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painter->drawText(m_labelTextRect, Qt::AlignCenter, m_data.m_labelText);
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break;
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case QPieSlice::LabelInsideTangential:
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painter->setClipPath(m_slicePath);
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painter->translate(m_labelTextRect.center());
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painter->rotate(m_data.m_startAngle + m_data.m_angleSpan / 2);
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painter->drawText(-m_labelTextRect.width() / 2, -m_labelTextRect.height() / 2, m_labelTextRect.width(), m_labelTextRect.height(), Qt::AlignCenter, m_data.m_labelText);
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break;
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case QPieSlice::LabelInsideNormal:
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painter->setClipPath(m_slicePath);
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painter->translate(m_labelTextRect.center());
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if (m_data.m_startAngle + m_data.m_angleSpan / 2 < 180)
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painter->rotate(m_data.m_startAngle + m_data.m_angleSpan / 2 - 90);
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else
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painter->rotate(m_data.m_startAngle + m_data.m_angleSpan / 2 + 90);
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painter->drawText(-m_labelTextRect.width() / 2, -m_labelTextRect.height() / 2, m_labelTextRect.width(), m_labelTextRect.height(), Qt::AlignCenter, m_data.m_labelText);
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break;
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}
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painter->restore();
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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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QGraphicsItem::mousePressEvent(event);
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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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// 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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// text rect
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QFontMetricsF fm(m_data.m_labelFont);
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m_labelTextRect = QRectF(0, 0, fm.width(m_data.m_labelText), fm.height());
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// 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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// text position
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switch (m_data.m_labelPosition) {
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case QPieSlice::LabelOutside:
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m_labelTextRect.moveBottomLeft(labelTextStart);
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if (m_labelTextRect.left() < 0)
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m_labelTextRect.setLeft(0);
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if (m_labelTextRect.right() > parentItem()->boundingRect().right())
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m_labelTextRect.setRight(parentItem()->boundingRect().right());
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break;
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case QPieSlice::LabelInsideHorizontal:
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case QPieSlice::LabelInsideTangential: {
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QPointF textCenter;
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if (m_data.m_holeRadius > 0)
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textCenter = m_data.m_center + offset(centerAngle, m_data.m_holeRadius + (m_data.m_radius - m_data.m_holeRadius) / 2);
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else
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textCenter = m_data.m_center + offset(centerAngle, m_data.m_radius / 2);
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m_labelTextRect.moveCenter(textCenter);
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break;
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}
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case QPieSlice::LabelInsideNormal: {
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QPointF textCenter;
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if (m_data.m_holeRadius > 0)
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textCenter = m_data.m_center + offset(centerAngle, m_data.m_holeRadius + (m_data.m_radius - m_data.m_holeRadius) / 2);
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else
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textCenter = m_data.m_center + offset(centerAngle, m_data.m_radius / 2);
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m_labelTextRect.moveCenter(textCenter);
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break;
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}
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}
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// 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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// Inflate bounding rect by 2/3 pen width to make sure it encompasses whole slice also for thick pens
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// and miter joins.
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int penWidth = (m_data.m_slicePen.width() * 2) / 3;
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m_boundingRect = m_boundingRect.adjusted(-penWidth, -penWidth, penWidth, penWidth);
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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->angleSpan() / 2);
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qreal len = radius * slice->explodeDistanceFactor();
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point += offset(centerAngle, len);
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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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QPainterPath path;
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if (m_data.m_holeRadius > 0) {
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QRectF insideRect(center.x() - m_data.m_holeRadius, center.y() - m_data.m_holeRadius, m_data.m_holeRadius * 2, m_data.m_holeRadius * 2);
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path.arcMoveTo(rect, -startAngle + 90);
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path.arcTo(rect, -startAngle + 90, -angleSpan);
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path.arcTo(insideRect, -startAngle + 90 - angleSpan, angleSpan);
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path.closeSubpath();
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} else {
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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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}
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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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// Normalize the angle to 0-360 range
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// NOTE: We are using int here on purpose. Depenging on platform and hardware
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// qreal can be a double, float or something the user gives to the Qt configure
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// (QT_COORD_TYPE). Compilers do not seem to support modulo for double or float
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// but there are fmod() and fmodf() functions for that. So instead of some #ifdef
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// that might break we just use int. Precision for this is just fine for our needs.
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int normalized = angle * 10.0;
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normalized = normalized % 3600;
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if (normalized < 0)
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normalized += 3600;
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angle = (qreal) normalized / 10.0;
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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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QPointF parm1 = start + offset(angle, length);
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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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} else {
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parm2 += QPointF(-textWidth, 0);
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*textStart = parm2;
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}
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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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#include "moc_piesliceitem_p.cpp"
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QTCOMMERCIALCHART_END_NAMESPACE
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