splinechartitem.cpp
276 lines
| 8.3 KiB
| text/x-c
|
CppLexer
Jani Honkonen
|
r794 | /**************************************************************************** | ||
Michal Klocek
|
r1218 | ** | ||
Miikka Heikkinen
|
r2432 | ** Copyright (C) 2013 Digia Plc | ||
|
Michal Klocek
|
r1218 | ** 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 | ||||
| ** $QT_END_LICENSE$ | ||||
| ** | ||||
| ****************************************************************************/ | ||||
|
Jani Honkonen
|
r794 | |||
Marek Rosa
|
r460 | #include "splinechartitem_p.h" | ||
|
Michal Klocek
|
r938 | #include "qsplineseries_p.h" | ||
|
Michal Klocek
|
r476 | #include "chartpresenter_p.h" | ||
|
Michal Klocek
|
r1735 | #include "splineanimation_p.h" | ||
|
Marek Rosa
|
r2275 | #include "abstractdomain_p.h" | ||
|
Marek Rosa
|
r401 | #include <QPainter> | ||
|
Michal Klocek
|
r1218 | #include <QGraphicsSceneMouseEvent> | ||
|
Marek Rosa
|
r295 | |||
|
Marek Rosa
|
r401 | QTCOMMERCIALCHART_BEGIN_NAMESPACE | ||
|
Michal Klocek
|
r2273 | SplineChartItem::SplineChartItem(QSplineSeries *series, QGraphicsItem* item) | ||
| : XYChart(series,item), | ||||
|
Jani Honkonen
|
r2097 | m_series(series), | ||
| m_pointsVisible(false), | ||||
| m_animation(0) | ||||
|
Marek Rosa
|
r295 | { | ||
|
Marek Rosa
|
r2256 | setAcceptHoverEvents(true); | ||
|
Michal Klocek
|
r1747 | setZValue(ChartPresenter::SplineChartZValue); | ||
|
Jani Honkonen
|
r2097 | QObject::connect(m_series->d_func(), SIGNAL(updated()), this, SLOT(handleUpdated())); | ||
Tero Ahola
|
r1342 | QObject::connect(series, SIGNAL(visibleChanged()), this, SLOT(handleUpdated())); | ||
|
Tero Ahola
|
r2067 | QObject::connect(series, SIGNAL(opacityChanged()), this, SLOT(handleUpdated())); | ||
|
Michal Klocek
|
r476 | handleUpdated(); | ||
|
Marek Rosa
|
r295 | } | ||
|
Michal Klocek
|
r465 | QRectF SplineChartItem::boundingRect() const | ||
| { | ||||
| return m_rect; | ||||
| } | ||||
|
Marek Rosa
|
r295 | |||
|
Michal Klocek
|
r465 | QPainterPath SplineChartItem::shape() const | ||
| { | ||||
|
Marek Rosa
|
r2256 | QPainterPathStroker stroker; | ||
| return stroker.createStroke(m_path); | ||||
|
Michal Klocek
|
r465 | } | ||
|
Marek Rosa
|
r401 | |||
|
Jani Honkonen
|
r2104 | void SplineChartItem::setAnimation(SplineAnimation *animation) | ||
|
Michal Klocek
|
r1217 | { | ||
|
Jani Honkonen
|
r2097 | m_animation = animation; | ||
|
Michal Klocek
|
r1218 | XYChart::setAnimation(animation); | ||
|
Michal Klocek
|
r1217 | } | ||
|
Jani Honkonen
|
r2104 | ChartAnimation *SplineChartItem::animation() const | ||
|
Michal Klocek
|
r1735 | { | ||
| return m_animation; | ||||
| } | ||||
|
Michal Klocek
|
r1217 | void SplineChartItem::setControlGeometryPoints(QVector<QPointF>& points) | ||
| { | ||||
|
Jani Honkonen
|
r2097 | m_controlPoints = points; | ||
|
Michal Klocek
|
r1217 | } | ||
| QVector<QPointF> SplineChartItem::controlGeometryPoints() const | ||||
| { | ||||
| return m_controlPoints; | ||||
| } | ||||
|
Jani Honkonen
|
r2097 | void SplineChartItem::updateChart(QVector<QPointF> &oldPoints, QVector<QPointF> &newPoints, int index) | ||
|
Michal Klocek
|
r1082 | { | ||
|
Michal Klocek
|
r622 | QVector<QPointF> controlPoints; | ||
|
Jani Honkonen
|
r2097 | if (newPoints.count() >= 2) | ||
|
Marek Rosa
|
r2372 | controlPoints = calculateControlPoints(newPoints); | ||
|
Michal Klocek
|
r622 | |||
|
Tero Ahola
|
r1782 | if (m_animation) | ||
| m_animation->setup(oldPoints, newPoints, m_controlPoints, controlPoints, index); | ||||
|
Michal Klocek
|
r622 | |||
|
Tero Ahola
|
r1782 | m_points = newPoints; | ||
| m_controlPoints = controlPoints; | ||||
|
Michal Klocek
|
r1770 | setDirty(false); | ||
|
Jani Honkonen
|
r2097 | if (m_animation) | ||
|
Michal Klocek
|
r1241 | presenter()->startAnimation(m_animation); | ||
|
Jani Honkonen
|
r2097 | else | ||
|
Michal Klocek
|
r1217 | updateGeometry(); | ||
|
Michal Klocek
|
r622 | } | ||
|
Michal Klocek
|
r1217 | void SplineChartItem::updateGeometry() | ||
|
Tero Ahola
|
r946 | { | ||
|
Tero Ahola
|
r1782 | const QVector<QPointF> &points = m_points; | ||
| const QVector<QPointF> &controlPoints = m_controlPoints; | ||||
|
Tero Ahola
|
r946 | |||
|
Jani Honkonen
|
r2097 | if ((points.size() < 2) || (controlPoints.size() < 2)) { | ||
| prepareGeometryChange(); | ||||
|
Marek Rosa
|
r1085 | m_path = QPainterPath(); | ||
|
Michal Klocek
|
r1271 | m_rect = QRect(); | ||
|
Marek Rosa
|
r545 | return; | ||
| } | ||||
|
Marek Rosa
|
r423 | |||
|
Jani Honkonen
|
r2097 | Q_ASSERT(points.count() * 2 - 2 == controlPoints.count()); | ||
|
Michal Klocek
|
r622 | |||
| QPainterPath splinePath(points.at(0)); | ||||
|
Marek Rosa
|
r423 | |||
sauimone
|
r743 | for (int i = 0; i < points.size() - 1; i++) { | ||
|
Jani Honkonen
|
r2104 | const QPointF &point = points.at(i + 1); | ||
|
Jani Honkonen
|
r2097 | splinePath.cubicTo(controlPoints[2 * i], controlPoints[2 * i + 1], point); | ||
|
Marek Rosa
|
r423 | } | ||
| prepareGeometryChange(); | ||||
|
Marek Rosa
|
r2256 | // QPainterPathStroker stroker; | ||
| // stroker.setWidth(m_linePen.width() / 2.0); | ||||
| // m_path = stroker.createStroke(splinePath); | ||||
|
Marek Rosa
|
r423 | m_path = splinePath; | ||
| m_rect = splinePath.boundingRect(); | ||||
|
Michal Klocek
|
r2273 | |||
|
Michal Klocek
|
r465 | } | ||
|
Marek Rosa
|
r2372 | /*! | ||
| 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; | ||||
| } | ||||
|
Michal Klocek
|
r476 | //handlers | ||
| void SplineChartItem::handleUpdated() | ||||
| { | ||||
|
Tero Ahola
|
r1346 | setVisible(m_series->isVisible()); | ||
|
Tero Ahola
|
r2067 | setOpacity(m_series->opacity()); | ||
|
Michal Klocek
|
r580 | m_pointsVisible = m_series->pointsVisible(); | ||
| m_linePen = m_series->pen(); | ||||
| m_pointPen = m_series->pen(); | ||||
|
Jani Honkonen
|
r2097 | m_pointPen.setWidthF(2 * m_pointPen.width()); | ||
|
Michal Klocek
|
r476 | update(); | ||
| } | ||||
| //painter | ||||
|
Michal Klocek
|
r465 | |||
|
Marek Rosa
|
r460 | void SplineChartItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) | ||
|
Marek Rosa
|
r423 | { | ||
|
Tero Ahola
|
r611 | Q_UNUSED(widget) | ||
| Q_UNUSED(option) | ||||
|
Tero Ahola
|
r1346 | |||
| painter->save(); | ||||
|
Michal Klocek
|
r2273 | painter->setClipRect(QRectF(QPointF(0,0),domain()->size())); | ||
|
Tero Ahola
|
r1346 | painter->setPen(m_linePen); | ||
|
Marek Rosa
|
r2256 | // painter->setBrush(m_linePen.color()); | ||
|
Tero Ahola
|
r1346 | painter->drawPath(m_path); | ||
| if (m_pointsVisible) { | ||||
| painter->setPen(m_pointPen); | ||||
| painter->drawPoints(geometryPoints()); | ||||
|
Michal Klocek
|
r580 | } | ||
|
Tero Ahola
|
r1346 | painter->restore(); | ||
|
Marek Rosa
|
r423 | } | ||
|
Marek Rosa
|
r417 | |||
|
Michal Klocek
|
r1218 | void SplineChartItem::mousePressEvent(QGraphicsSceneMouseEvent *event) | ||
| { | ||||
|
Michal Klocek
|
r2273 | emit XYChart::clicked(domain()->calculateDomainPoint(event->pos())); | ||
|
Michal Klocek
|
r1747 | QGraphicsItem::mousePressEvent(event); | ||
|
Michal Klocek
|
r1218 | } | ||
|
Michal Klocek
|
r476 | |||
|
Marek Rosa
|
r2256 | void SplineChartItem::hoverEnterEvent(QGraphicsSceneHoverEvent *event) | ||
| { | ||||
|
Michal Klocek
|
r2273 | emit XYChart::hovered(domain()->calculateDomainPoint(event->pos()), true); | ||
|
Marek Rosa
|
r2356 | QGraphicsItem::hoverEnterEvent(event); | ||
|
Marek Rosa
|
r2256 | } | ||
| void SplineChartItem::hoverLeaveEvent(QGraphicsSceneHoverEvent *event) | ||||
| { | ||||
|
Michal Klocek
|
r2273 | emit XYChart::hovered(domain()->calculateDomainPoint(event->pos()), false); | ||
|
Marek Rosa
|
r2356 | QGraphicsItem::hoverLeaveEvent(event); | ||
|
Marek Rosa
|
r2256 | } | ||
|
Marek Rosa
|
r460 | #include "moc_splinechartitem_p.cpp" | ||
|
Marek Rosa
|
r401 | |||
| QTCOMMERCIALCHART_END_NAMESPACE | ||||