Rename gallery and qmlgallery examples as they are too genericv6.6.0-beta1

Gallery name conflicted with widgets example of same name.
New names are chartsgallery and qmlchartsgallery.

Fixes: QTBUG-114408
Change-Id: Iee9fdfa1f685685a4118fb9d401c1e53147546cb
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>
(cherry picked from commit 2ae46ef08f6a10a0d44557bb592db06be667f2bb)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 77 insertions, 0 deletions

diff --git a/examples/charts/chartsgallery/interactionschart.cpp b/examples/charts/chartsgallery/interactionschart.cpp
new file mode 100644
index 00000000..740c9f64
--- /dev/null
+++ b/examples/charts/chartsgallery/interactionschart.cpp
@@ -0,0 +1,77 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
+
+#include "interactionschart.h"
+
+#include <QLineSeries>
+#include <QtMath>
+#include <QValueAxis>
+
+InteractionsChart::InteractionsChart(QGraphicsItem *parent, Qt::WindowFlags wFlags, QLineSeries *series)
+    : QChart(QChart::ChartTypeCartesian, parent, wFlags), m_series(series)
+{
+}
+
+void InteractionsChart::clickPoint(const QPointF &point)
+{
+    // Find the closest data point
+    m_movingPoint = QPoint();
+    m_clicked = false;
+    const auto points = m_series->points();
+    for (QPointF p : points) {
+        if (distance(p, point) < distance(m_movingPoint, point)) {
+            m_movingPoint = p;
+            m_clicked = true;
+        }
+    }
+}
+
+qreal InteractionsChart::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 InteractionsChart::setPointClicked(bool clicked)
+{
+    m_clicked = clicked;
+}
+
+void InteractionsChart::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 chart scale
+        QAbstractAxis *axisx = axes(Qt::Horizontal).first();
+        QValueAxis *haxis = nullptr;
+        if (axisx->type() == QAbstractAxis::AxisTypeValue)
+            haxis = qobject_cast<QValueAxis *>(axisx);
+
+        QAbstractAxis *axisy = axes(Qt::Vertical).first();
+        QValueAxis *vaxis = nullptr;
+        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);
+        }
+    }
+}
+