1 files changed, 101 insertions, 0 deletions
diff --git a/examples/charts/chartinteractions/chart.cpp b/examples/charts/chartinteractions/chart.cpp
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+++ b/examples/charts/chartinteractions/chart.cpp
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+/****************************************************************************
+**
+** 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 "chart.h"
+#include <QValueAxis>
+#include <QAbstractAxis>
+#include <qmath.h>
+
+Chart::Chart(QGraphicsItem *parent, Qt::WindowFlags wFlags, QLineSeries *series)
+    : QChart(QChart::ChartTypeCartesian, parent, wFlags), m_series(series)
+{
+    m_clicked = false;
+}
+
+Chart::~Chart()
+{
+}
+
+void Chart::clickPoint(const QPointF &point)
+{
+    // Find the closes data point
+    m_movingPoint = QPoint();
+    m_clicked = false;
+    foreach (QPointF p, m_series->points()) {
+        if (distance(p, point) < distance(m_movingPoint, point)) {
+            m_movingPoint = p;
+            m_clicked = true;
+        }
+    }
+}
+
+qreal Chart::distance(const QPointF &p1, const QPointF &p2)
+{
+    return qSqrt((p1.x() - p2.x()) * (p1.x() - p2.x())
+                + (p1.y() - p2.y()) * (p1.y() - p2.y()));
+}
+
+void Chart::setPointClicked(bool clicked)
+{
+    m_clicked = clicked;
+}
+
+void Chart::handlePointMove(const QPoint &point)
+{
+    if (m_clicked) {
+        //Map the point clicked from the ChartView
+        //to the area occupied by the chart.
+        QPoint mappedPoint = point;
+        mappedPoint.setX(point.x() - this->plotArea().x());
+        mappedPoint.setY(point.y() - this->plotArea().y());
+
+        //Get the x- and y axis to be able to convert the mapped
+        //coordinate point to the charts scale.
+        QAbstractAxis *axisx = this->axisX();
+        QValueAxis *haxis = 0;
+        if (axisx->type() == QAbstractAxis::AxisTypeValue)
+            haxis = qobject_cast<QValueAxis *>(axisx);
+
+        QAbstractAxis *axisy = this->axisY();
+        QValueAxis *vaxis = 0;
+        if (axisy->type() == QAbstractAxis::AxisTypeValue)
+            vaxis = qobject_cast<QValueAxis *>(axisy);
+
+        if (haxis && vaxis) {
+            //Calculate the "unit" between points on the x
+            //y axis.
+            double xUnit = this->plotArea().width() / haxis->max();
+            double yUnit = this->plotArea().height() / vaxis->max();
+
+            //Convert the mappedPoint to the actual chart scale.
+            double x = mappedPoint.x() / xUnit;
+            double y = vaxis->max() - mappedPoint.y() / yUnit;
+
+            //Replace the old point with the new one.
+            m_series->replace(m_movingPoint, QPointF(x, y));
+
+            //Update the m_movingPoint so we are able to
+            //do the replace also during mousemoveEvent.
+            m_movingPoint.setX(x);
+            m_movingPoint.setY(y);
+        }
+    }
+}
+