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Diffstat (limited to 'src/splinechart/splinechartitem.cpp')
| -rw-r--r-- | src/splinechart/splinechartitem.cpp | 485 |
1 files changed, 0 insertions, 485 deletions
diff --git a/src/splinechart/splinechartitem.cpp b/src/splinechart/splinechartitem.cpp deleted file mode 100644 index 2b14686f..00000000 --- a/src/splinechart/splinechartitem.cpp +++ /dev/null @@ -1,485 +0,0 @@ -/**************************************************************************** - ** - ** Copyright (C) 2014 Digia Plc - ** All rights reserved. - ** For any questions to Digia, please use contact form at http://qt.digia.com - ** - ** This file is part of the Qt Enterprise Charts Add-on. - ** - ** $QT_BEGIN_LICENSE$ - ** Licensees holding valid Qt Enterprise licenses may use this file in - ** accordance with the Qt Enterprise 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 - ** $QT_END_LICENSE$ - ** - ****************************************************************************/ - -#include "splinechartitem_p.h" -#include "qsplineseries_p.h" -#include "chartpresenter_p.h" -#include "splineanimation_p.h" -#include "polardomain_p.h" -#include <QPainter> -#include <QGraphicsSceneMouseEvent> - -QTCOMMERCIALCHART_BEGIN_NAMESPACE - -SplineChartItem::SplineChartItem(QSplineSeries *series, QGraphicsItem *item) - : XYChart(series,item), - m_series(series), - m_pointsVisible(false), - m_animation(0), - m_pointLabelsVisible(false), - m_pointLabelsFormat(series->pointLabelsFormat()), - m_pointLabelsFont(series->pointLabelsFont()), - m_pointLabelsColor(series->pointLabelsColor()) -{ - setAcceptHoverEvents(true); - setZValue(ChartPresenter::SplineChartZValue); - QObject::connect(m_series->d_func(), SIGNAL(updated()), this, SLOT(handleUpdated())); - QObject::connect(series, SIGNAL(visibleChanged()), this, SLOT(handleUpdated())); - QObject::connect(series, SIGNAL(opacityChanged()), this, SLOT(handleUpdated())); - QObject::connect(series, SIGNAL(pointLabelsFormatChanged(QString)), - this, SLOT(handleUpdated())); - QObject::connect(series, SIGNAL(pointLabelsVisibilityChanged(bool)), - this, SLOT(handleUpdated())); - QObject::connect(series, SIGNAL(pointLabelsFontChanged(QFont)), this, SLOT(handleUpdated())); - QObject::connect(series, SIGNAL(pointLabelsColorChanged(QColor)), this, SLOT(handleUpdated())); - handleUpdated(); -} - -QRectF SplineChartItem::boundingRect() const -{ - return m_rect; -} - -QPainterPath SplineChartItem::shape() const -{ - return m_fullPath; -} - -void SplineChartItem::setAnimation(SplineAnimation *animation) -{ - m_animation = animation; - XYChart::setAnimation(animation); -} - -ChartAnimation *SplineChartItem::animation() const -{ - return m_animation; -} - -void SplineChartItem::setControlGeometryPoints(QVector<QPointF>& points) -{ - m_controlPoints = points; -} - -QVector<QPointF> SplineChartItem::controlGeometryPoints() const -{ - return m_controlPoints; -} - -void SplineChartItem::updateChart(QVector<QPointF> &oldPoints, QVector<QPointF> &newPoints, int index) -{ - QVector<QPointF> controlPoints; - if (newPoints.count() >= 2) - controlPoints = calculateControlPoints(newPoints); - - if (m_animation) - m_animation->setup(oldPoints, newPoints, m_controlPoints, controlPoints, index); - - m_points = newPoints; - m_controlPoints = controlPoints; - setDirty(false); - - if (m_animation) - presenter()->startAnimation(m_animation); - else - updateGeometry(); -} - -void SplineChartItem::updateGeometry() -{ - const QVector<QPointF> &points = m_points; - const QVector<QPointF> &controlPoints = m_controlPoints; - - if ((points.size() < 2) || (controlPoints.size() < 2)) { - prepareGeometryChange(); - m_path = QPainterPath(); - m_rect = QRect(); - return; - } - - Q_ASSERT(points.count() * 2 - 2 == controlPoints.count()); - - QPainterPath splinePath; - QPainterPath fullPath; - // Use worst case scenario to determine required margin. - qreal margin = m_linePen.width() * 1.42; - - if (m_series->chart()->chartType() == QChart::ChartTypePolar) { - QPainterPath splinePathLeft; - QPainterPath splinePathRight; - QPainterPath *currentSegmentPath = 0; - QPainterPath *previousSegmentPath = 0; - qreal minX = domain()->minX(); - qreal maxX = domain()->maxX(); - qreal minY = domain()->minY(); - QPointF currentSeriesPoint = m_series->at(0); - QPointF currentGeometryPoint = points.at(0); - QPointF previousGeometryPoint = points.at(0); - bool pointOffGrid = false; - bool previousPointWasOffGrid = (currentSeriesPoint.x() < minX || currentSeriesPoint.x() > maxX); - m_visiblePoints.clear(); - m_visiblePoints.reserve(points.size()); - - qreal domainRadius = domain()->size().height() / 2.0; - const QPointF centerPoint(domainRadius, domainRadius); - - if (!previousPointWasOffGrid) { - fullPath.moveTo(points.at(0)); - // Do not draw points for points below minimum Y. - if (m_pointsVisible && currentSeriesPoint.y() >= minY) - m_visiblePoints.append(currentGeometryPoint); - } - - qreal leftMarginLine = centerPoint.x() - margin; - qreal rightMarginLine = centerPoint.x() + margin; - qreal horizontal = centerPoint.y(); - - // See ScatterChartItem::updateGeometry() for explanation why seriesLastIndex is needed - const int seriesLastIndex = m_series->count() - 1; - - for (int i = 1; i < points.size(); i++) { - // Interpolating spline fragments accurately is not trivial, and would anyway be ugly - // when thick pen is used, so we work around it by utilizing three separate - // paths for spline 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. - currentSeriesPoint = m_series->at(qMin(seriesLastIndex, i)); - currentGeometryPoint = points.at(i); - pointOffGrid = (currentSeriesPoint.x() < minX || currentSeriesPoint.x() > maxX); - - // Draw something unless both off-grid - if (!pointOffGrid || !previousPointWasOffGrid) { - bool dummyOk; // We know points are ok, but this is needed - qreal currentAngle = static_cast<PolarDomain *>(domain())->toAngularCoordinate(currentSeriesPoint.x(), dummyOk); - qreal previousAngle = static_cast<PolarDomain *>(domain())->toAngularCoordinate(m_series->at(i - 1).x(), dummyOk); - - 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 = &splinePathRight; - } else if ((previousAngle > 360.0 || (previousAngle > 180.0 && previousGeometryPoint.x() > leftMarginLine)) - && previousGeometryPoint.y() < horizontal) { - currentSegmentPath = &splinePathLeft; - } else if (previousAngle > 0.0 && previousAngle < 360.0) { - currentSegmentPath = &splinePath; - } else { - currentSegmentPath = 0; - } - - if (currentSegmentPath) { - if (previousSegmentPath != currentSegmentPath) - currentSegmentPath->moveTo(previousGeometryPoint); - if (!previousSegmentPath) - fullPath.moveTo(previousGeometryPoint); - - currentSegmentPath->lineTo(centerPoint); - fullPath.lineTo(centerPoint); - } - - previousSegmentPath = currentSegmentPath; - - if ((currentAngle < 0.0 || (currentAngle <= 180.0 && currentGeometryPoint.x() < rightMarginLine)) - && currentGeometryPoint.y() < horizontal) { - currentSegmentPath = &splinePathRight; - } else if ((currentAngle > 360.0 || (currentAngle > 180.0 &¤tGeometryPoint.x() > leftMarginLine)) - && currentGeometryPoint.y() < horizontal) { - currentSegmentPath = &splinePathLeft; - } else if (currentAngle > 0.0 && currentAngle < 360.0) { - currentSegmentPath = &splinePath; - } else { - currentSegmentPath = 0; - } - - if (currentSegmentPath) { - if (previousSegmentPath != currentSegmentPath) - currentSegmentPath->moveTo(centerPoint); - if (!previousSegmentPath) - fullPath.moveTo(centerPoint); - - currentSegmentPath->lineTo(currentGeometryPoint); - fullPath.lineTo(currentGeometryPoint); - } - } else { - QPointF cp1 = controlPoints[2 * (i - 1)]; - QPointF cp2 = controlPoints[(2 * i) - 1]; - - 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 = &splinePathRight; - } 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 = &splinePathLeft; - } else { - currentSegmentPath = &splinePath; - } - - if (currentSegmentPath != previousSegmentPath) - currentSegmentPath->moveTo(previousGeometryPoint); - if (!previousSegmentPath) - fullPath.moveTo(previousGeometryPoint); - - fullPath.cubicTo(cp1, cp2, currentGeometryPoint); - currentSegmentPath->cubicTo(cp1, cp2, currentGeometryPoint); - } - } else { - currentSegmentPath = 0; - } - - previousPointWasOffGrid = pointOffGrid; - if (!pointOffGrid && m_pointsVisible && currentSeriesPoint.y() >= minY) - m_visiblePoints.append(currentGeometryPoint); - previousSegmentPath = currentSegmentPath; - previousGeometryPoint = currentGeometryPoint; - } - - m_pathPolarRight = splinePathRight; - m_pathPolarLeft = splinePathLeft; - // 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 - splinePath.moveTo(points.at(0)); - for (int i = 0; i < points.size() - 1; i++) { - const QPointF &point = points.at(i + 1); - splinePath.cubicTo(controlPoints[2 * i], controlPoints[2 * i + 1], point); - } - fullPath = splinePath; - } - - QPainterPathStroker stroker; - // The full path is comprised of three separate paths. - // 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. - stroker.setWidth(margin); - stroker.setJoinStyle(Qt::MiterJoin); - stroker.setCapStyle(Qt::SquareCap); - stroker.setMiterLimit(m_linePen.miterLimit()); - - // Only zoom in if the bounding rects of the path fit inside int limits. QWidget::update() uses - // a region that has to be compatible with QRect. - QPainterPath checkShapePath = stroker.createStroke(fullPath); - if (checkShapePath.boundingRect().height() <= INT_MAX - && checkShapePath.boundingRect().width() <= INT_MAX - && splinePath.boundingRect().height() <= INT_MAX - && splinePath.boundingRect().width() <= INT_MAX) { - m_path = splinePath; - - prepareGeometryChange(); - - m_fullPath = checkShapePath; - m_rect = m_fullPath.boundingRect(); - } -} - -/*! - Calculates control points which are needed by QPainterPath.cubicTo function to draw the cubic Bezier cureve between two points. - */ -QVector<QPointF> SplineChartItem::calculateControlPoints(const QVector<QPointF> &points) -{ - QVector<QPointF> controlPoints; - controlPoints.resize(points.count() * 2 - 2); - - int n = points.count() - 1; - - if (n == 1) { - //for n==1 - controlPoints[0].setX((2 * points[0].x() + points[1].x()) / 3); - controlPoints[0].setY((2 * points[0].y() + points[1].y()) / 3); - controlPoints[1].setX(2 * controlPoints[0].x() - points[0].x()); - controlPoints[1].setY(2 * controlPoints[0].y() - points[0].y()); - return controlPoints; - } - - // Calculate first Bezier control points - // Set of equations for P0 to Pn points. - // - // | 2 1 0 0 ... 0 0 0 ... 0 0 0 | | P1_1 | | P0 + 2 * P1 | - // | 1 4 1 0 ... 0 0 0 ... 0 0 0 | | P1_2 | | 4 * P1 + 2 * P2 | - // | 0 1 4 1 ... 0 0 0 ... 0 0 0 | | P1_3 | | 4 * P2 + 2 * P3 | - // | . . . . . . . . . . . . | | ... | | ... | - // | 0 0 0 0 ... 1 4 1 ... 0 0 0 | * | P1_i | = | 4 * P(i-1) + 2 * Pi | - // | . . . . . . . . . . . . | | ... | | ... | - // | 0 0 0 0 0 0 0 0 ... 1 4 1 | | P1_(n-1)| | 4 * P(n-2) + 2 * P(n-1) | - // | 0 0 0 0 0 0 0 0 ... 0 2 7 | | P1_n | | 8 * P(n-1) + Pn | - // - QVector<qreal> vector; - vector.resize(n); - - vector[0] = points[0].x() + 2 * points[1].x(); - - - for (int i = 1; i < n - 1; ++i) - vector[i] = 4 * points[i].x() + 2 * points[i + 1].x(); - - vector[n - 1] = (8 * points[n - 1].x() + points[n].x()) / 2.0; - - QVector<qreal> xControl = firstControlPoints(vector); - - vector[0] = points[0].y() + 2 * points[1].y(); - - for (int i = 1; i < n - 1; ++i) - vector[i] = 4 * points[i].y() + 2 * points[i + 1].y(); - - vector[n - 1] = (8 * points[n - 1].y() + points[n].y()) / 2.0; - - QVector<qreal> yControl = firstControlPoints(vector); - - for (int i = 0, j = 0; i < n; ++i, ++j) { - - controlPoints[j].setX(xControl[i]); - controlPoints[j].setY(yControl[i]); - - j++; - - if (i < n - 1) { - controlPoints[j].setX(2 * points[i + 1].x() - xControl[i + 1]); - controlPoints[j].setY(2 * points[i + 1].y() - yControl[i + 1]); - } else { - controlPoints[j].setX((points[n].x() + xControl[n - 1]) / 2); - controlPoints[j].setY((points[n].y() + yControl[n - 1]) / 2); - } - } - return controlPoints; -} - -QVector<qreal> SplineChartItem::firstControlPoints(const QVector<qreal>& vector) -{ - QVector<qreal> result; - - int count = vector.count(); - result.resize(count); - result[0] = vector[0] / 2.0; - - QVector<qreal> temp; - temp.resize(count); - temp[0] = 0; - - qreal b = 2.0; - - for (int i = 1; i < count; i++) { - temp[i] = 1 / b; - b = (i < count - 1 ? 4.0 : 3.5) - temp[i]; - result[i] = (vector[i] - result[i - 1]) / b; - } - - for (int i = 1; i < count; i++) - result[count - i - 1] -= temp[count - i] * result[count - i]; - - return result; -} - -//handlers - -void SplineChartItem::handleUpdated() -{ - setVisible(m_series->isVisible()); - setOpacity(m_series->opacity()); - m_pointsVisible = m_series->pointsVisible(); - m_linePen = m_series->pen(); - m_pointPen = m_series->pen(); - m_pointPen.setWidthF(2 * m_pointPen.width()); - m_pointLabelsFormat = m_series->pointLabelsFormat(); - m_pointLabelsVisible = m_series->pointLabelsVisible(); - m_pointLabelsFont = m_series->pointLabelsFont(); - m_pointLabelsColor = m_series->pointLabelsColor(); - update(); -} - -//painter - -void SplineChartItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) -{ - Q_UNUSED(widget) - Q_UNUSED(option) - - QRectF clipRect = QRectF(QPointF(0, 0), domain()->size()); - - painter->save(); - painter->setPen(m_linePen); - painter->setBrush(Qt::NoBrush); - - 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_pathPolarLeft); - painter->setClipRegion(clipRegionRight); - painter->drawPath(m_pathPolarRight); - painter->setClipRegion(fullPolarClipRegion); - } else { - painter->setClipRect(clipRect); - } - - painter->drawPath(m_path); - - if (m_pointsVisible) { - painter->setPen(m_pointPen); - if (m_series->chart()->chartType() == QChart::ChartTypePolar) - painter->drawPoints(m_visiblePoints); - else - painter->drawPoints(geometryPoints()); - } - - if (m_pointLabelsVisible) - m_series->d_func()->drawSeriesPointLabels(painter, m_points, m_linePen.width() / 2); - - painter->restore(); -} - -void SplineChartItem::mousePressEvent(QGraphicsSceneMouseEvent *event) -{ - emit XYChart::clicked(domain()->calculateDomainPoint(event->pos())); - QGraphicsItem::mousePressEvent(event); -} - -void SplineChartItem::hoverEnterEvent(QGraphicsSceneHoverEvent *event) -{ - emit XYChart::hovered(domain()->calculateDomainPoint(event->pos()), true); - QGraphicsItem::hoverEnterEvent(event); -} - -void SplineChartItem::hoverLeaveEvent(QGraphicsSceneHoverEvent *event) -{ - emit XYChart::hovered(domain()->calculateDomainPoint(event->pos()), false); - QGraphicsItem::hoverLeaveEvent(event); -} - -#include "moc_splinechartitem_p.cpp" - -QTCOMMERCIALCHART_END_NAMESPACE |