linechartitem.cpp
372 lines
| 16.2 KiB
| text/x-c
|
CppLexer
Jani Honkonen
|
r794 | /**************************************************************************** | ||
| ** | ||||
Miikka Heikkinen
|
r2432 | ** Copyright (C) 2013 Digia Plc | ||
|
Jani Honkonen
|
r794 | ** All rights reserved. | ||
| ** For any questions to Digia, please use contact form at http://qt.digia.com | ||||
| ** | ||||
| ** This file is part of the Qt Commercial Charts Add-on. | ||||
| ** | ||||
| ** $QT_BEGIN_LICENSE$ | ||||
| ** Licensees holding valid Qt Commercial licenses may use this file in | ||||
| ** accordance with the Qt Commercial License Agreement provided with the | ||||
| ** Software or, alternatively, in accordance with the terms contained in | ||||
| ** a written agreement between you and Digia. | ||||
| ** | ||||
| ** If you have questions regarding the use of this file, please use | ||||
| ** contact form at http://qt.digia.com | ||||
| ** $QT_END_LICENSE$ | ||||
| ** | ||||
| ****************************************************************************/ | ||||
Michal Klocek
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r144 | #include "linechartitem_p.h" | ||
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Michal Klocek
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r349 | #include "qlineseries.h" | ||
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Michal Klocek
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r938 | #include "qlineseries_p.h" | ||
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Michal Klocek
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r131 | #include "chartpresenter_p.h" | ||
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Miikka Heikkinen
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r2483 | #include "polardomain_p.h" | ||
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Michal Klocek
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r21 | #include <QPainter> | ||
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Michal Klocek
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r1218 | #include <QGraphicsSceneMouseEvent> | ||
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r144 | |||
Tero Ahola
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r30 | QTCOMMERCIALCHART_BEGIN_NAMESPACE | ||
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r21 | |||
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Tero Ahola
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r1792 | const qreal mouseEventMinWidth(12); | ||
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Michal Klocek
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r150 | |||
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Miikka Heikkinen
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r2483 | LineChartItem::LineChartItem(QLineSeries *series, QGraphicsItem *item) | ||
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Michal Klocek
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r2273 | : XYChart(series,item), | ||
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Jani Honkonen
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r2097 | m_series(series), | ||
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Miikka Heikkinen
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r2483 | m_pointsVisible(false), | ||
| m_chartType(QChart::ChartTypeUndefined) | ||||
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Michal Klocek
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r21 | { | ||
Marek Rosa
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r2255 | setAcceptHoverEvents(true); | ||
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Michal Klocek
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r262 | setZValue(ChartPresenter::LineChartZValue); | ||
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Jani Honkonen
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r2097 | QObject::connect(series->d_func(), SIGNAL(updated()), this, SLOT(handleUpdated())); | ||
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Tero Ahola
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r1342 | QObject::connect(series, SIGNAL(visibleChanged()), this, SLOT(handleUpdated())); | ||
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Tero Ahola
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r2067 | QObject::connect(series, SIGNAL(opacityChanged()), this, SLOT(handleUpdated())); | ||
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Michal Klocek
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r439 | handleUpdated(); | ||
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Michal Klocek
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r21 | } | ||
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Michal Klocek
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r144 | QRectF LineChartItem::boundingRect() const | ||
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Tero Ahola
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r103 | { | ||
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Jani Honkonen
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r2097 | return m_rect; | ||
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Tero Ahola
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r103 | } | ||
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Michal Klocek
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r85 | |||
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Michal Klocek
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r144 | QPainterPath LineChartItem::shape() const | ||
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Michal Klocek
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r67 | { | ||
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Miikka Heikkinen
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r2483 | return m_shapePath; | ||
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Michal Klocek
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r131 | } | ||
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Michal Klocek
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r85 | |||
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Michal Klocek
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r1217 | void LineChartItem::updateGeometry() | ||
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Michal Klocek
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r131 | { | ||
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Michal Klocek
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r1819 | m_points = geometryPoints(); | ||
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Miikka Heikkinen
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r2483 | const QVector<QPointF> &points = m_points; | ||
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Michal Klocek
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r1217 | |||
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Miikka Heikkinen
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r2483 | if (points.size() == 0) { | ||
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Michal Klocek
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r1269 | prepareGeometryChange(); | ||
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Miikka Heikkinen
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r2483 | m_fullPath = QPainterPath(); | ||
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Miikka Heikkinen
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r2451 | m_linePath = QPainterPath(); | ||
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Michal Klocek
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r1269 | m_rect = QRect(); | ||
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Marek Rosa
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r545 | return; | ||
| } | ||||
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Michal Klocek
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r464 | |||
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Miikka Heikkinen
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r2483 | QPainterPath linePath; | ||
| QPainterPath fullPath; | ||||
| // Use worst case scenario to determine required margin. | ||||
| qreal margin = m_linePen.width() * 1.42; | ||||
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Michal Klocek
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r464 | |||
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Miikka Heikkinen
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r2483 | // Area series use component line series that aren't necessarily added to the chart themselves, | ||
| // so check if chart type is forced before trying to obtain it from the chart. | ||||
| QChart::ChartType chartType = m_chartType; | ||||
| if (chartType == QChart::ChartTypeUndefined) | ||||
| chartType = m_series->chart()->chartType(); | ||||
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Michal Klocek
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r1819 | |||
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Miikka Heikkinen
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r2483 | // For polar charts, we need special handling for angular (horizontal) | ||
| // points that are off-grid. | ||||
| if (chartType == QChart::ChartTypePolar) { | ||||
| QPainterPath linePathLeft; | ||||
| QPainterPath linePathRight; | ||||
| QPainterPath *currentSegmentPath = 0; | ||||
| QPainterPath *previousSegmentPath = 0; | ||||
| qreal minX = domain()->minX(); | ||||
| qreal maxX = domain()->maxX(); | ||||
| qreal minY = domain()->minY(); | ||||
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Miikka Heikkinen
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r2491 | QPointF currentSeriesPoint = m_series->at(0); | ||
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Miikka Heikkinen
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r2483 | QPointF currentGeometryPoint = points.at(0); | ||
| QPointF previousGeometryPoint = points.at(0); | ||||
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Michal Klocek
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r1819 | int size = m_linePen.width(); | ||
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Miikka Heikkinen
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r2483 | bool pointOffGrid = false; | ||
| bool previousPointWasOffGrid = (currentSeriesPoint.x() < minX || currentSeriesPoint.x() > maxX); | ||||
| qreal domainRadius = domain()->size().height() / 2.0; | ||||
| const QPointF centerPoint(domainRadius, domainRadius); | ||||
| if (!previousPointWasOffGrid) { | ||||
| fullPath.moveTo(points.at(0)); | ||||
| if (m_pointsVisible && currentSeriesPoint.y() >= minY) { | ||||
| // Do not draw ellipses for points below minimum Y. | ||||
| linePath.addEllipse(points.at(0), size, size); | ||||
| fullPath.addEllipse(points.at(0), size, size); | ||||
| linePath.moveTo(points.at(0)); | ||||
| fullPath.moveTo(points.at(0)); | ||||
| } | ||||
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Michal Klocek
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r1819 | } | ||
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Miikka Heikkinen
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r2483 | qreal leftMarginLine = centerPoint.x() - margin; | ||
| qreal rightMarginLine = centerPoint.x() + margin; | ||||
| qreal horizontal = centerPoint.y(); | ||||
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Michal Klocek
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r464 | |||
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Miikka Heikkinen
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r2489 | // See ScatterChartItem::updateGeometry() for explanation why seriesLastIndex is needed | ||
| const int seriesLastIndex = m_series->count() - 1; | ||||
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Miikka Heikkinen
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r2483 | for (int i = 1; i < points.size(); i++) { | ||
| // Interpolating line fragments would be ugly when thick pen is used, | ||||
| // so we work around it by utilizing three separate | ||||
| // paths for line segments and clip those with custom regions at paint time. | ||||
| // "Right" path contains segments that cross the axis line with visible point on the | ||||
| // right side of the axis line, as well as segments that have one point within the margin | ||||
| // on the right side of the axis line and another point on the right side of the chart. | ||||
| // "Left" path contains points with similarly on the left side. | ||||
| // "Full" path contains rest of the points. | ||||
| // This doesn't yield perfect results always. E.g. when segment covers more than 90 | ||||
| // degrees and both of the points are within the margin, one in the top half and one in the | ||||
| // bottom half of the chart, the bottom one gets clipped incorrectly. | ||||
| // However, this should be rare occurrence in any sensible chart. | ||||
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Miikka Heikkinen
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r2491 | currentSeriesPoint = m_series->at(qMin(seriesLastIndex, i)); | ||
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Miikka Heikkinen
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r2483 | currentGeometryPoint = points.at(i); | ||
| pointOffGrid = (currentSeriesPoint.x() < minX || currentSeriesPoint.x() > maxX); | ||||
| // Draw something unless both off-grid | ||||
| if (!pointOffGrid || !previousPointWasOffGrid) { | ||||
| QPointF intersectionPoint; | ||||
| qreal y; | ||||
| if (pointOffGrid != previousPointWasOffGrid) { | ||||
| if (currentGeometryPoint.x() == previousGeometryPoint.x()) { | ||||
| y = currentGeometryPoint.y() + (currentGeometryPoint.y() - previousGeometryPoint.y()) / 2.0; | ||||
| } else { | ||||
| qreal ratio = (centerPoint.x() - currentGeometryPoint.x()) / (currentGeometryPoint.x() - previousGeometryPoint.x()); | ||||
| y = currentGeometryPoint.y() + (currentGeometryPoint.y() - previousGeometryPoint.y()) * ratio; | ||||
| } | ||||
| intersectionPoint = QPointF(centerPoint.x(), y); | ||||
| } | ||||
| bool dummyOk; // We know points are ok, but this is needed | ||||
| qreal currentAngle = static_cast<PolarDomain *>(domain())->toAngularCoordinate(currentSeriesPoint.x(), dummyOk); | ||||
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Miikka Heikkinen
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r2491 | qreal previousAngle = static_cast<PolarDomain *>(domain())->toAngularCoordinate(m_series->at(i - 1).x(), dummyOk); | ||
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Miikka Heikkinen
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r2483 | |||
| if ((qAbs(currentAngle - previousAngle) > 180.0)) { | ||||
| // If the angle between two points is over 180 degrees (half X range), | ||||
| // any direct segment between them becomes meaningless. | ||||
| // In this case two line segments are drawn instead, from previous | ||||
| // point to the center and from center to current point. | ||||
| if ((previousAngle < 0.0 || (previousAngle <= 180.0 && previousGeometryPoint.x() < rightMarginLine)) | ||||
| && previousGeometryPoint.y() < horizontal) { | ||||
| currentSegmentPath = &linePathRight; | ||||
| } else if ((previousAngle > 360.0 || (previousAngle > 180.0 && previousGeometryPoint.x() > leftMarginLine)) | ||||
| && previousGeometryPoint.y() < horizontal) { | ||||
| currentSegmentPath = &linePathLeft; | ||||
| } else if (previousAngle > 0.0 && previousAngle < 360.0) { | ||||
| currentSegmentPath = &linePath; | ||||
| } else { | ||||
| currentSegmentPath = 0; | ||||
| } | ||||
| if (currentSegmentPath) { | ||||
| if (previousSegmentPath != currentSegmentPath) | ||||
| currentSegmentPath->moveTo(previousGeometryPoint); | ||||
| if (previousPointWasOffGrid) | ||||
| fullPath.moveTo(intersectionPoint); | ||||
| currentSegmentPath->lineTo(centerPoint); | ||||
| fullPath.lineTo(centerPoint); | ||||
| } | ||||
| previousSegmentPath = currentSegmentPath; | ||||
| if ((currentAngle < 0.0 || (currentAngle <= 180.0 && currentGeometryPoint.x() < rightMarginLine)) | ||||
| && currentGeometryPoint.y() < horizontal) { | ||||
| currentSegmentPath = &linePathRight; | ||||
| } else if ((currentAngle > 360.0 || (currentAngle > 180.0 &¤tGeometryPoint.x() > leftMarginLine)) | ||||
| && currentGeometryPoint.y() < horizontal) { | ||||
| currentSegmentPath = &linePathLeft; | ||||
| } else if (currentAngle > 0.0 && currentAngle < 360.0) { | ||||
| currentSegmentPath = &linePath; | ||||
| } else { | ||||
| currentSegmentPath = 0; | ||||
| } | ||||
| if (currentSegmentPath) { | ||||
| if (previousSegmentPath != currentSegmentPath) | ||||
| currentSegmentPath->moveTo(centerPoint); | ||||
| if (!previousSegmentPath) | ||||
| fullPath.moveTo(centerPoint); | ||||
| currentSegmentPath->lineTo(currentGeometryPoint); | ||||
| if (pointOffGrid) | ||||
| fullPath.lineTo(intersectionPoint); | ||||
| else | ||||
| fullPath.lineTo(currentGeometryPoint); | ||||
| } | ||||
| } else { | ||||
| if (previousAngle < 0.0 || currentAngle < 0.0 | ||||
| || ((previousAngle <= 180.0 && currentAngle <= 180.0) | ||||
| && ((previousGeometryPoint.x() < rightMarginLine && previousGeometryPoint.y() < horizontal) | ||||
| || (currentGeometryPoint.x() < rightMarginLine && currentGeometryPoint.y() < horizontal)))) { | ||||
| currentSegmentPath = &linePathRight; | ||||
| } else if (previousAngle > 360.0 || currentAngle > 360.0 | ||||
| || ((previousAngle > 180.0 && currentAngle > 180.0) | ||||
| && ((previousGeometryPoint.x() > leftMarginLine && previousGeometryPoint.y() < horizontal) | ||||
| || (currentGeometryPoint.x() > leftMarginLine && currentGeometryPoint.y() < horizontal)))) { | ||||
| currentSegmentPath = &linePathLeft; | ||||
| } else { | ||||
| currentSegmentPath = &linePath; | ||||
| } | ||||
| if (currentSegmentPath != previousSegmentPath) | ||||
| currentSegmentPath->moveTo(previousGeometryPoint); | ||||
| if (previousPointWasOffGrid) | ||||
| fullPath.moveTo(intersectionPoint); | ||||
| if (pointOffGrid) | ||||
| fullPath.lineTo(intersectionPoint); | ||||
| else | ||||
| fullPath.lineTo(currentGeometryPoint); | ||||
| currentSegmentPath->lineTo(currentGeometryPoint); | ||||
| } | ||||
| } else { | ||||
| currentSegmentPath = 0; | ||||
| } | ||||
| previousPointWasOffGrid = pointOffGrid; | ||||
| if (m_pointsVisible && !pointOffGrid && currentSeriesPoint.y() >= minY) { | ||||
| linePath.addEllipse(points.at(i), size, size); | ||||
| fullPath.addEllipse(points.at(i), size, size); | ||||
| linePath.moveTo(points.at(i)); | ||||
| fullPath.moveTo(points.at(i)); | ||||
| } | ||||
| previousSegmentPath = currentSegmentPath; | ||||
| previousGeometryPoint = currentGeometryPoint; | ||||
| } | ||||
| m_linePathPolarRight = linePathRight; | ||||
| m_linePathPolarLeft = linePathLeft; | ||||
| // Note: This construction of m_fullpath is not perfect. The partial segments that are | ||||
| // outside left/right clip regions at axis boundary still generate hover/click events, | ||||
| // because shape doesn't get clipped. It doesn't seem possible to do sensibly. | ||||
| } else { // not polar | ||||
| linePath.moveTo(points.at(0)); | ||||
| if (m_pointsVisible) { | ||||
| int size = m_linePen.width(); | ||||
| linePath.addEllipse(points.at(0), size, size); | ||||
| linePath.moveTo(points.at(0)); | ||||
| for (int i = 1; i < points.size(); i++) { | ||||
| linePath.lineTo(points.at(i)); | ||||
| linePath.addEllipse(points.at(i), size, size); | ||||
| linePath.moveTo(points.at(i)); | ||||
| } | ||||
| } else { | ||||
| for (int i = 1; i < points.size(); i++) | ||||
| linePath.lineTo(points.at(i)); | ||||
| } | ||||
| fullPath = linePath; | ||||
| } | ||||
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Tero Ahola
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r1823 | |||
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Michal Klocek
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r1819 | QPainterPathStroker stroker; | ||
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Tero Ahola
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r1823 | // QPainter::drawLine does not respect join styles, for example BevelJoin becomes MiterJoin. | ||
| // This is why we are prepared for the "worst case" scenario, i.e. use always MiterJoin and | ||||
| // multiply line width with square root of two when defining shape and bounding rectangle. | ||||
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Miikka Heikkinen
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r2483 | stroker.setWidth(margin); | ||
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Tero Ahola
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r1823 | stroker.setJoinStyle(Qt::MiterJoin); | ||
| stroker.setCapStyle(Qt::SquareCap); | ||||
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Michal Klocek
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r1821 | stroker.setMiterLimit(m_linePen.miterLimit()); | ||
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Tero Ahola
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r1791 | |||
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Michal Klocek
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r1819 | prepareGeometryChange(); | ||
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Tero Ahola
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r1791 | |||
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Miikka Heikkinen
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r2483 | m_linePath = linePath; | ||
| m_fullPath = fullPath; | ||||
| m_shapePath = stroker.createStroke(fullPath); | ||||
| m_rect = m_shapePath.boundingRect(); | ||||
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Michal Klocek
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r21 | } | ||
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Michal Klocek
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r392 | void LineChartItem::handleUpdated() | ||
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Michal Klocek
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r389 | { | ||
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Miikka Heikkinen
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r2451 | // If points visiblity has changed, a geometry update is needed. | ||
| // Also, if pen changes when points are visible, geometry update is needed. | ||||
| bool doGeometryUpdate = | ||||
| (m_pointsVisible != m_series->pointsVisible()) | ||||
| || (m_series->pointsVisible() && (m_linePen != m_series->pen())); | ||||
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Tero Ahola
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r1346 | setVisible(m_series->isVisible()); | ||
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Tero Ahola
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r2067 | setOpacity(m_series->opacity()); | ||
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Michal Klocek
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r544 | m_pointsVisible = m_series->pointsVisible(); | ||
| m_linePen = m_series->pen(); | ||||
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Miikka Heikkinen
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r2451 | if (doGeometryUpdate) | ||
| updateGeometry(); | ||||
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Michal Klocek
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r139 | update(); | ||
| } | ||||
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Michal Klocek
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r391 | void LineChartItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) | ||
| { | ||||
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Tero Ahola
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r611 | Q_UNUSED(widget) | ||
| Q_UNUSED(option) | ||||
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Miikka Heikkinen
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r2483 | QRectF clipRect = QRectF(QPointF(0, 0), domain()->size()); | ||
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Tero Ahola
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r1828 | painter->save(); | ||
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Tero Ahola
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r1346 | painter->setPen(m_linePen); | ||
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Miikka Heikkinen
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r2483 | bool alwaysUsePath = false; | ||
| if (m_series->chart()->chartType() == QChart::ChartTypePolar) { | ||||
| qreal halfWidth = domain()->size().width() / 2.0; | ||||
| QRectF clipRectLeft = QRectF(0, 0, halfWidth, domain()->size().height()); | ||||
| QRectF clipRectRight = QRectF(halfWidth, 0, halfWidth, domain()->size().height()); | ||||
| QRegion fullPolarClipRegion(clipRect.toRect(), QRegion::Ellipse); | ||||
| QRegion clipRegionLeft(fullPolarClipRegion.intersected(clipRectLeft.toRect())); | ||||
| QRegion clipRegionRight(fullPolarClipRegion.intersected(clipRectRight.toRect())); | ||||
| painter->setClipRegion(clipRegionLeft); | ||||
| painter->drawPath(m_linePathPolarLeft); | ||||
| painter->setClipRegion(clipRegionRight); | ||||
| painter->drawPath(m_linePathPolarRight); | ||||
| painter->setClipRegion(fullPolarClipRegion); | ||||
| alwaysUsePath = true; // required for proper clipping | ||||
| } else { | ||||
| painter->setClipRect(clipRect); | ||||
| } | ||||
|
Michal Klocek
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r1819 | |||
| if (m_pointsVisible) { | ||||
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Miikka Heikkinen
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r2457 | painter->setBrush(m_linePen.color()); | ||
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Michal Klocek
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r1819 | painter->drawPath(m_linePath); | ||
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Jani Honkonen
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r2097 | } else { | ||
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Miikka Heikkinen
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r2457 | painter->setBrush(QBrush(Qt::NoBrush)); | ||
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Miikka Heikkinen
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r2483 | if (m_linePen.style() != Qt::SolidLine || alwaysUsePath) { | ||
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Miikka Heikkinen
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r2457 | // If pen style is not solid line, always fall back to path painting | ||
| // to ensure proper continuity of the pattern | ||||
| painter->drawPath(m_linePath); | ||||
| } else { | ||||
| for (int i(1); i < m_points.size(); i++) | ||||
| painter->drawLine(m_points.at(i - 1), m_points.at(i)); | ||||
| } | ||||
|
Michal Klocek
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r544 | } | ||
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Miikka Heikkinen
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r2457 | |||
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Tero Ahola
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r1828 | painter->restore(); | ||
|
Michal Klocek
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r391 | } | ||
|
Michal Klocek
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r1218 | void LineChartItem::mousePressEvent(QGraphicsSceneMouseEvent *event) | ||
| { | ||||
|
Michal Klocek
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r2273 | emit XYChart::clicked(domain()->calculateDomainPoint(event->pos())); | ||
|
Michal Klocek
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r1747 | QGraphicsItem::mousePressEvent(event); | ||
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Michal Klocek
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r1218 | } | ||
|
Marek Rosa
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r2255 | void LineChartItem::hoverEnterEvent(QGraphicsSceneHoverEvent *event) | ||
| { | ||||
|
Michal Klocek
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r2273 | emit XYChart::hovered(domain()->calculateDomainPoint(event->pos()), true); | ||
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Marek Rosa
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r2356 | // event->accept(); | ||
| QGraphicsItem::hoverEnterEvent(event); | ||||
|
Marek Rosa
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r2255 | } | ||
| void LineChartItem::hoverLeaveEvent(QGraphicsSceneHoverEvent *event) | ||||
| { | ||||
|
Michal Klocek
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r2273 | emit XYChart::hovered(domain()->calculateDomainPoint(event->pos()), false); | ||
|
Marek Rosa
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r2356 | // event->accept(); | ||
| QGraphicsItem::hoverEnterEvent(event); | ||||
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Marek Rosa
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r2255 | } | ||
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Michal Klocek
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r144 | #include "moc_linechartitem_p.cpp" | ||
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Michal Klocek
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r131 | |||
|
Tero Ahola
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r30 | QTCOMMERCIALCHART_END_NAMESPACE | ||