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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 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 "splinechartitem_p.h"
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#include "qsplineseries_p.h"
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#include "chartpresenter_p.h"
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#include "splineanimation_p.h"
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#include "polardomain_p.h"
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#include <QPainter>
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#include <QGraphicsSceneMouseEvent>
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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SplineChartItem::SplineChartItem(QSplineSeries *series, QGraphicsItem *item)
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: XYChart(series,item),
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m_series(series),
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m_pointsVisible(false),
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m_animation(0)
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{
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setAcceptHoverEvents(true);
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setZValue(ChartPresenter::SplineChartZValue);
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QObject::connect(m_series->d_func(), SIGNAL(updated()), this, SLOT(handleUpdated()));
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QObject::connect(series, SIGNAL(visibleChanged()), this, SLOT(handleUpdated()));
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QObject::connect(series, SIGNAL(opacityChanged()), this, SLOT(handleUpdated()));
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handleUpdated();
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}
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QRectF SplineChartItem::boundingRect() const
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{
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return m_rect;
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}
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QPainterPath SplineChartItem::shape() const
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{
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return m_fullPath;
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}
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void SplineChartItem::setAnimation(SplineAnimation *animation)
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{
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m_animation = animation;
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XYChart::setAnimation(animation);
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}
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ChartAnimation *SplineChartItem::animation() const
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{
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return m_animation;
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}
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void SplineChartItem::setControlGeometryPoints(QVector<QPointF>& points)
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{
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m_controlPoints = points;
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}
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QVector<QPointF> SplineChartItem::controlGeometryPoints() const
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{
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return m_controlPoints;
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}
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void SplineChartItem::updateChart(QVector<QPointF> &oldPoints, QVector<QPointF> &newPoints, int index)
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{
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QVector<QPointF> controlPoints;
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if (newPoints.count() >= 2)
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controlPoints = calculateControlPoints(newPoints);
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if (m_animation)
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m_animation->setup(oldPoints, newPoints, m_controlPoints, controlPoints, index);
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m_points = newPoints;
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m_controlPoints = controlPoints;
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setDirty(false);
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if (m_animation)
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presenter()->startAnimation(m_animation);
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else
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updateGeometry();
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}
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void SplineChartItem::updateGeometry()
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{
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const QVector<QPointF> &points = m_points;
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const QVector<QPointF> &controlPoints = m_controlPoints;
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if ((points.size() < 2) || (controlPoints.size() < 2)) {
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prepareGeometryChange();
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m_path = QPainterPath();
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m_rect = QRect();
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return;
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}
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Q_ASSERT(points.count() * 2 - 2 == controlPoints.count());
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QPainterPath splinePath;
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QPainterPath fullPath;
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// Use worst case scenario to determine required margin.
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qreal margin = m_linePen.width() * 1.42;
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if (m_series->chart()->chartType() == QChart::ChartTypePolar) {
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QPainterPath splinePathLeft;
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QPainterPath splinePathRight;
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QPainterPath *currentSegmentPath = 0;
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QPainterPath *previousSegmentPath = 0;
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qreal minX = domain()->minX();
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qreal maxX = domain()->maxX();
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qreal minY = domain()->minY();
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QPointF currentSeriesPoint = m_series->pointAt(0);
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QPointF currentGeometryPoint = points.at(0);
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QPointF previousGeometryPoint = points.at(0);
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bool pointOffGrid = false;
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bool previousPointWasOffGrid = (currentSeriesPoint.x() < minX || currentSeriesPoint.x() > maxX);
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m_visiblePoints.clear();
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m_visiblePoints.reserve(points.size());
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qreal domainRadius = domain()->size().height() / 2.0;
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const QPointF centerPoint(domainRadius, domainRadius);
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if (!previousPointWasOffGrid) {
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fullPath.moveTo(points.at(0));
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// Do not draw points for points below minimum Y.
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if (m_pointsVisible && currentSeriesPoint.y() >= minY)
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m_visiblePoints.append(currentGeometryPoint);
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}
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qreal leftMarginLine = centerPoint.x() - margin;
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qreal rightMarginLine = centerPoint.x() + margin;
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qreal horizontal = centerPoint.y();
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// See ScatterChartItem::updateGeometry() for explanation why seriesLastIndex is needed
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const int seriesLastIndex = m_series->count() - 1;
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for (int i = 1; i < points.size(); i++) {
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// Interpolating spline fragments accurately is not trivial, and would anyway be ugly
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// when thick pen is used, so we work around it by utilizing three separate
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// paths for spline segments and clip those with custom regions at paint time.
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// "Right" path contains segments that cross the axis line with visible point on the
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// right side of the axis line, as well as segments that have one point within the margin
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// on the right side of the axis line and another point on the right side of the chart.
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// "Left" path contains points with similarly on the left side.
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// "Full" path contains rest of the points.
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// This doesn't yield perfect results always. E.g. when segment covers more than 90
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// degrees and both of the points are within the margin, one in the top half and one in the
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// bottom half of the chart, the bottom one gets clipped incorrectly.
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// However, this should be rare occurrence in any sensible chart.
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currentSeriesPoint = m_series->pointAt(qMin(seriesLastIndex, i));
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currentGeometryPoint = points.at(i);
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pointOffGrid = (currentSeriesPoint.x() < minX || currentSeriesPoint.x() > maxX);
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// Draw something unless both off-grid
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if (!pointOffGrid || !previousPointWasOffGrid) {
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bool dummyOk; // We know points are ok, but this is needed
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qreal currentAngle = static_cast<PolarDomain *>(domain())->toAngularCoordinate(currentSeriesPoint.x(), dummyOk);
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qreal previousAngle = static_cast<PolarDomain *>(domain())->toAngularCoordinate(m_series->pointAt(i - 1).x(), dummyOk);
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if ((qAbs(currentAngle - previousAngle) > 180.0)) {
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// If the angle between two points is over 180 degrees (half X range),
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// any direct segment between them becomes meaningless.
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// In this case two line segments are drawn instead, from previous
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// point to the center and from center to current point.
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if ((previousAngle < 0.0 || (previousAngle <= 180.0 && previousGeometryPoint.x() < rightMarginLine))
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&& previousGeometryPoint.y() < horizontal) {
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currentSegmentPath = &splinePathRight;
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} else if ((previousAngle > 360.0 || (previousAngle > 180.0 && previousGeometryPoint.x() > leftMarginLine))
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&& previousGeometryPoint.y() < horizontal) {
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currentSegmentPath = &splinePathLeft;
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} else if (previousAngle > 0.0 && previousAngle < 360.0) {
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currentSegmentPath = &splinePath;
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} else {
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currentSegmentPath = 0;
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}
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if (currentSegmentPath) {
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if (previousSegmentPath != currentSegmentPath)
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currentSegmentPath->moveTo(previousGeometryPoint);
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if (!previousSegmentPath)
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fullPath.moveTo(previousGeometryPoint);
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currentSegmentPath->lineTo(centerPoint);
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fullPath.lineTo(centerPoint);
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}
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previousSegmentPath = currentSegmentPath;
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if ((currentAngle < 0.0 || (currentAngle <= 180.0 && currentGeometryPoint.x() < rightMarginLine))
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&& currentGeometryPoint.y() < horizontal) {
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currentSegmentPath = &splinePathRight;
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} else if ((currentAngle > 360.0 || (currentAngle > 180.0 &¤tGeometryPoint.x() > leftMarginLine))
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&& currentGeometryPoint.y() < horizontal) {
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currentSegmentPath = &splinePathLeft;
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} else if (currentAngle > 0.0 && currentAngle < 360.0) {
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currentSegmentPath = &splinePath;
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} else {
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currentSegmentPath = 0;
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}
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if (currentSegmentPath) {
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if (previousSegmentPath != currentSegmentPath)
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currentSegmentPath->moveTo(centerPoint);
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if (!previousSegmentPath)
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fullPath.moveTo(centerPoint);
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currentSegmentPath->lineTo(currentGeometryPoint);
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fullPath.lineTo(currentGeometryPoint);
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}
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} else {
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QPointF cp1 = controlPoints[2 * (i - 1)];
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QPointF cp2 = controlPoints[(2 * i) - 1];
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if (previousAngle < 0.0 || currentAngle < 0.0
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|| ((previousAngle <= 180.0 && currentAngle <= 180.0)
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&& ((previousGeometryPoint.x() < rightMarginLine && previousGeometryPoint.y() < horizontal)
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|| (currentGeometryPoint.x() < rightMarginLine && currentGeometryPoint.y() < horizontal)))) {
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currentSegmentPath = &splinePathRight;
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} else if (previousAngle > 360.0 || currentAngle > 360.0
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|| ((previousAngle > 180.0 && currentAngle > 180.0)
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&& ((previousGeometryPoint.x() > leftMarginLine && previousGeometryPoint.y() < horizontal)
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|| (currentGeometryPoint.x() > leftMarginLine && currentGeometryPoint.y() < horizontal)))) {
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currentSegmentPath = &splinePathLeft;
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} else {
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currentSegmentPath = &splinePath;
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}
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if (currentSegmentPath != previousSegmentPath)
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currentSegmentPath->moveTo(previousGeometryPoint);
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if (!previousSegmentPath)
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fullPath.moveTo(previousGeometryPoint);
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fullPath.cubicTo(cp1, cp2, currentGeometryPoint);
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currentSegmentPath->cubicTo(cp1, cp2, currentGeometryPoint);
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}
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} else {
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currentSegmentPath = 0;
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}
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previousPointWasOffGrid = pointOffGrid;
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if (!pointOffGrid && m_pointsVisible && currentSeriesPoint.y() >= minY)
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m_visiblePoints.append(currentGeometryPoint);
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previousSegmentPath = currentSegmentPath;
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previousGeometryPoint = currentGeometryPoint;
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}
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m_pathPolarRight = splinePathRight;
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m_pathPolarLeft = splinePathLeft;
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// Note: This construction of m_fullpath is not perfect. The partial segments that are
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// outside left/right clip regions at axis boundary still generate hover/click events,
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// because shape doesn't get clipped. It doesn't seem possible to do sensibly.
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} else { // not polar
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splinePath.moveTo(points.at(0));
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for (int i = 0; i < points.size() - 1; i++) {
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const QPointF &point = points.at(i + 1);
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splinePath.cubicTo(controlPoints[2 * i], controlPoints[2 * i + 1], point);
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}
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fullPath = splinePath;
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}
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m_path = splinePath;
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QPainterPathStroker stroker;
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// The full path is comprised of three separate paths.
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// This is why we are prepared for the "worst case" scenario, i.e. use always MiterJoin and
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// multiply line width with square root of two when defining shape and bounding rectangle.
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stroker.setWidth(margin);
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stroker.setJoinStyle(Qt::MiterJoin);
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stroker.setCapStyle(Qt::SquareCap);
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stroker.setMiterLimit(m_linePen.miterLimit());
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prepareGeometryChange();
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m_fullPath = stroker.createStroke(fullPath);
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m_rect = m_fullPath.boundingRect();
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}
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/*!
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Calculates control points which are needed by QPainterPath.cubicTo function to draw the cubic Bezier cureve between two points.
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*/
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QVector<QPointF> SplineChartItem::calculateControlPoints(const QVector<QPointF> &points)
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{
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QVector<QPointF> controlPoints;
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controlPoints.resize(points.count() * 2 - 2);
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int n = points.count() - 1;
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if (n == 1) {
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//for n==1
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controlPoints[0].setX((2 * points[0].x() + points[1].x()) / 3);
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controlPoints[0].setY((2 * points[0].y() + points[1].y()) / 3);
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controlPoints[1].setX(2 * controlPoints[0].x() - points[0].x());
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controlPoints[1].setY(2 * controlPoints[0].y() - points[0].y());
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return controlPoints;
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}
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// Calculate first Bezier control points
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// Set of equations for P0 to Pn points.
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//
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// | 2 1 0 0 ... 0 0 0 ... 0 0 0 | | P1_1 | | P0 + 2 * P1 |
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// | 1 4 1 0 ... 0 0 0 ... 0 0 0 | | P1_2 | | 4 * P1 + 2 * P2 |
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// | 0 1 4 1 ... 0 0 0 ... 0 0 0 | | P1_3 | | 4 * P2 + 2 * P3 |
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// | . . . . . . . . . . . . | | ... | | ... |
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// | 0 0 0 0 ... 1 4 1 ... 0 0 0 | * | P1_i | = | 4 * P(i-1) + 2 * Pi |
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// | . . . . . . . . . . . . | | ... | | ... |
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// | 0 0 0 0 0 0 0 0 ... 1 4 1 | | P1_(n-1)| | 4 * P(n-2) + 2 * P(n-1) |
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// | 0 0 0 0 0 0 0 0 ... 0 2 7 | | P1_n | | 8 * P(n-1) + Pn |
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//
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QVector<qreal> vector;
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vector.resize(n);
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vector[0] = points[0].x() + 2 * points[1].x();
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for (int i = 1; i < n - 1; ++i)
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vector[i] = 4 * points[i].x() + 2 * points[i + 1].x();
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vector[n - 1] = (8 * points[n - 1].x() + points[n].x()) / 2.0;
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QVector<qreal> xControl = firstControlPoints(vector);
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vector[0] = points[0].y() + 2 * points[1].y();
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for (int i = 1; i < n - 1; ++i)
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vector[i] = 4 * points[i].y() + 2 * points[i + 1].y();
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vector[n - 1] = (8 * points[n - 1].y() + points[n].y()) / 2.0;
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QVector<qreal> yControl = firstControlPoints(vector);
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for (int i = 0, j = 0; i < n; ++i, ++j) {
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controlPoints[j].setX(xControl[i]);
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controlPoints[j].setY(yControl[i]);
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j++;
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if (i < n - 1) {
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controlPoints[j].setX(2 * points[i + 1].x() - xControl[i + 1]);
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controlPoints[j].setY(2 * points[i + 1].y() - yControl[i + 1]);
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} else {
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controlPoints[j].setX((points[n].x() + xControl[n - 1]) / 2);
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controlPoints[j].setY((points[n].y() + yControl[n - 1]) / 2);
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}
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}
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return controlPoints;
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}
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QVector<qreal> SplineChartItem::firstControlPoints(const QVector<qreal>& vector)
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{
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QVector<qreal> result;
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int count = vector.count();
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result.resize(count);
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result[0] = vector[0] / 2.0;
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QVector<qreal> temp;
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temp.resize(count);
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temp[0] = 0;
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qreal b = 2.0;
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for (int i = 1; i < count; i++) {
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temp[i] = 1 / b;
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b = (i < count - 1 ? 4.0 : 3.5) - temp[i];
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result[i] = (vector[i] - result[i - 1]) / b;
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}
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for (int i = 1; i < count; i++)
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result[count - i - 1] -= temp[count - i] * result[count - i];
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return result;
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}
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//handlers
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void SplineChartItem::handleUpdated()
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{
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setVisible(m_series->isVisible());
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setOpacity(m_series->opacity());
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m_pointsVisible = m_series->pointsVisible();
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m_linePen = m_series->pen();
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m_pointPen = m_series->pen();
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m_pointPen.setWidthF(2 * m_pointPen.width());
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update();
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}
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//painter
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void SplineChartItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
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{
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Q_UNUSED(widget)
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Q_UNUSED(option)
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QRectF clipRect = QRectF(QPointF(0, 0), domain()->size());
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painter->save();
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painter->setPen(m_linePen);
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painter->setBrush(Qt::NoBrush);
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if (m_series->chart()->chartType() == QChart::ChartTypePolar) {
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qreal halfWidth = domain()->size().width() / 2.0;
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QRectF clipRectLeft = QRectF(0, 0, halfWidth, domain()->size().height());
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QRectF clipRectRight = QRectF(halfWidth, 0, halfWidth, domain()->size().height());
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QRegion fullPolarClipRegion(clipRect.toRect(), QRegion::Ellipse);
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QRegion clipRegionLeft(fullPolarClipRegion.intersected(clipRectLeft.toRect()));
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QRegion clipRegionRight(fullPolarClipRegion.intersected(clipRectRight.toRect()));
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painter->setClipRegion(clipRegionLeft);
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painter->drawPath(m_pathPolarLeft);
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painter->setClipRegion(clipRegionRight);
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painter->drawPath(m_pathPolarRight);
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painter->setClipRegion(fullPolarClipRegion);
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} else {
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painter->setClipRect(clipRect);
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|
}
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painter->drawPath(m_path);
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|
if (m_pointsVisible) {
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|
|
painter->setPen(m_pointPen);
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|
|
if (m_series->chart()->chartType() == QChart::ChartTypePolar)
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|
painter->drawPoints(m_visiblePoints);
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else
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painter->drawPoints(geometryPoints());
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|
}
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painter->restore();
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|
}
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|
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|
void SplineChartItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
|
|
|
{
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|
|
emit XYChart::clicked(domain()->calculateDomainPoint(event->pos()));
|
|
|
QGraphicsItem::mousePressEvent(event);
|
|
|
}
|
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|
|
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|
void SplineChartItem::hoverEnterEvent(QGraphicsSceneHoverEvent *event)
|
|
|
{
|
|
|
emit XYChart::hovered(domain()->calculateDomainPoint(event->pos()), true);
|
|
|
QGraphicsItem::hoverEnterEvent(event);
|
|
|
}
|
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|
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|
void SplineChartItem::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
|
|
|
{
|
|
|
emit XYChart::hovered(domain()->calculateDomainPoint(event->pos()), false);
|
|
|
QGraphicsItem::hoverLeaveEvent(event);
|
|
|
}
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#include "moc_splinechartitem_p.cpp"
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QTCOMMERCIALCHART_END_NAMESPACE
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|
