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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 "linechartitem_p.h"
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#include "qlineseries.h"
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#include "qlineseries_p.h"
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#include "chartpresenter_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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const qreal mouseEventMinWidth(12);
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LineChartItem::LineChartItem(QLineSeries *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_chartType(QChart::ChartTypeUndefined)
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{
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setAcceptHoverEvents(true);
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setZValue(ChartPresenter::LineChartZValue);
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QObject::connect(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 LineChartItem::boundingRect() const
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{
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return m_rect;
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}
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QPainterPath LineChartItem::shape() const
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{
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return m_shapePath;
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}
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void LineChartItem::updateGeometry()
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{
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m_points = geometryPoints();
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const QVector<QPointF> &points = m_points;
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if (points.size() == 0) {
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prepareGeometryChange();
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m_fullPath = QPainterPath();
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m_linePath = QPainterPath();
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m_rect = QRect();
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return;
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}
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QPainterPath linePath;
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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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// Area series use component line series that aren't necessarily added to the chart themselves,
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// so check if chart type is forced before trying to obtain it from the chart.
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QChart::ChartType chartType = m_chartType;
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if (chartType == QChart::ChartTypeUndefined)
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chartType = m_series->chart()->chartType();
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// For polar charts, we need special handling for angular (horizontal)
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// points that are off-grid.
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if (chartType == QChart::ChartTypePolar) {
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QPainterPath linePathLeft;
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QPainterPath linePathRight;
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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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int size = m_linePen.width();
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bool pointOffGrid = false;
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bool previousPointWasOffGrid = (currentSeriesPoint.x() < minX || currentSeriesPoint.x() > maxX);
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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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if (m_pointsVisible && currentSeriesPoint.y() >= minY) {
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// Do not draw ellipses for points below minimum Y.
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linePath.addEllipse(points.at(0), size, size);
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fullPath.addEllipse(points.at(0), size, size);
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linePath.moveTo(points.at(0));
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fullPath.moveTo(points.at(0));
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}
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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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for (int i = 1; i < points.size(); i++) {
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// Interpolating line fragments would be ugly when thick pen is used,
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// so we work around it by utilizing three separate
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// paths for line 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(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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QPointF intersectionPoint;
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qreal y;
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if (pointOffGrid != previousPointWasOffGrid) {
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if (currentGeometryPoint.x() == previousGeometryPoint.x()) {
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y = currentGeometryPoint.y() + (currentGeometryPoint.y() - previousGeometryPoint.y()) / 2.0;
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} else {
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qreal ratio = (centerPoint.x() - currentGeometryPoint.x()) / (currentGeometryPoint.x() - previousGeometryPoint.x());
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y = currentGeometryPoint.y() + (currentGeometryPoint.y() - previousGeometryPoint.y()) * ratio;
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}
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intersectionPoint = QPointF(centerPoint.x(), y);
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}
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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 = &linePathRight;
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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 = &linePathLeft;
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} else if (previousAngle > 0.0 && previousAngle < 360.0) {
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currentSegmentPath = &linePath;
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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 (previousPointWasOffGrid)
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fullPath.moveTo(intersectionPoint);
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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 = &linePathRight;
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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 = &linePathLeft;
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} else if (currentAngle > 0.0 && currentAngle < 360.0) {
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currentSegmentPath = &linePath;
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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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if (pointOffGrid)
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fullPath.lineTo(intersectionPoint);
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else
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fullPath.lineTo(currentGeometryPoint);
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}
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} else {
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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 = &linePathRight;
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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 = &linePathLeft;
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} else {
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currentSegmentPath = &linePath;
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}
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if (currentSegmentPath != previousSegmentPath)
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currentSegmentPath->moveTo(previousGeometryPoint);
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if (previousPointWasOffGrid)
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fullPath.moveTo(intersectionPoint);
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if (pointOffGrid)
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fullPath.lineTo(intersectionPoint);
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else
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fullPath.lineTo(currentGeometryPoint);
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currentSegmentPath->lineTo(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 (m_pointsVisible && !pointOffGrid && currentSeriesPoint.y() >= minY) {
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linePath.addEllipse(points.at(i), size, size);
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fullPath.addEllipse(points.at(i), size, size);
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linePath.moveTo(points.at(i));
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fullPath.moveTo(points.at(i));
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}
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previousSegmentPath = currentSegmentPath;
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previousGeometryPoint = currentGeometryPoint;
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}
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m_linePathPolarRight = linePathRight;
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m_linePathPolarLeft = linePathLeft;
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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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linePath.moveTo(points.at(0));
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if (m_pointsVisible) {
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int size = m_linePen.width();
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linePath.addEllipse(points.at(0), size, size);
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linePath.moveTo(points.at(0));
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for (int i = 1; i < points.size(); i++) {
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linePath.lineTo(points.at(i));
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linePath.addEllipse(points.at(i), size, size);
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linePath.moveTo(points.at(i));
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}
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} else {
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for (int i = 1; i < points.size(); i++)
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linePath.lineTo(points.at(i));
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}
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fullPath = linePath;
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}
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QPainterPathStroker stroker;
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// QPainter::drawLine does not respect join styles, for example BevelJoin becomes MiterJoin.
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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_linePath = linePath;
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m_fullPath = fullPath;
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m_shapePath = stroker.createStroke(fullPath);
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m_rect = m_shapePath.boundingRect();
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}
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void LineChartItem::handleUpdated()
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{
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// If points visiblity has changed, a geometry update is needed.
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// Also, if pen changes when points are visible, geometry update is needed.
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bool doGeometryUpdate =
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(m_pointsVisible != m_series->pointsVisible())
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|| (m_series->pointsVisible() && (m_linePen != m_series->pen()));
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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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if (doGeometryUpdate)
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updateGeometry();
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update();
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}
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void LineChartItem::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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bool alwaysUsePath = false;
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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_linePathPolarLeft);
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painter->setClipRegion(clipRegionRight);
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painter->drawPath(m_linePathPolarRight);
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painter->setClipRegion(fullPolarClipRegion);
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alwaysUsePath = true; // required for proper clipping
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} else {
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painter->setClipRect(clipRect);
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}
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if (m_pointsVisible) {
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painter->setBrush(m_linePen.color());
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painter->drawPath(m_linePath);
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} else {
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painter->setBrush(QBrush(Qt::NoBrush));
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if (m_linePen.style() != Qt::SolidLine || alwaysUsePath) {
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// If pen style is not solid line, always fall back to path painting
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// to ensure proper continuity of the pattern
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painter->drawPath(m_linePath);
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} else {
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for (int i(1); i < m_points.size(); i++)
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painter->drawLine(m_points.at(i - 1), m_points.at(i));
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}
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}
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painter->restore();
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}
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void LineChartItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
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{
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emit XYChart::clicked(domain()->calculateDomainPoint(event->pos()));
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QGraphicsItem::mousePressEvent(event);
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}
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void LineChartItem::hoverEnterEvent(QGraphicsSceneHoverEvent *event)
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{
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emit XYChart::hovered(domain()->calculateDomainPoint(event->pos()), true);
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// event->accept();
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QGraphicsItem::hoverEnterEvent(event);
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}
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void LineChartItem::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
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{
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emit XYChart::hovered(domain()->calculateDomainPoint(event->pos()), false);
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// event->accept();
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QGraphicsItem::hoverEnterEvent(event);
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}
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#include "moc_linechartitem_p.cpp"
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QTCOMMERCIALCHART_END_NAMESPACE
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