Hello Alfonso,
Thank you for contacting Telerik Support.
ZoomGesture occurs when a zoom gesture was sent by a touch input device
only. However, it is possible to catch zooming on
MouseWheel event if the
ControlKey is pressed:
public partial class Form1 : Form
{
bool IsCtrlPressed = false;
public Form1()
{
InitializeComponent();
BarSeries barSeries = new BarSeries("Performance", "RepresentativeName");
barSeries.Name = "Q1";
barSeries.DataPoints.Add(new CategoricalDataPoint(177, "Harley"));
barSeries.DataPoints.Add(new CategoricalDataPoint(128, "White"));
barSeries.DataPoints.Add(new CategoricalDataPoint(143, "Smith"));
barSeries.DataPoints.Add(new CategoricalDataPoint(111, "Jones"));
barSeries.DataPoints.Add(new CategoricalDataPoint(118, "Marshall"));
this.radChartView1.Series.Add(barSeries);
BarSeries barSeries2 = new BarSeries("Performance", "RepresentativeName");
barSeries2.Name = "Q2";
barSeries2.DataPoints.Add(new CategoricalDataPoint(153, "Harley"));
barSeries2.DataPoints.Add(new CategoricalDataPoint(141, "White"));
barSeries2.DataPoints.Add(new CategoricalDataPoint(130, "Smith"));
barSeries2.DataPoints.Add(new CategoricalDataPoint(88, "Jones"));
barSeries2.DataPoints.Add(new CategoricalDataPoint(109, "Marshall"));
this.radChartView1.Series.Add(barSeries2);
radChartView1.ShowPanZoom = true;
radChartView1.MouseWheel += radChartView1_MouseWheel;
radChartView1.KeyDown += radChartView1_KeyDown;
}
private void radChartView1_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode==Keys.ControlKey)
{
IsCtrlPressed = true;
}
}
private void radChartView1_MouseWheel(object sender, MouseEventArgs e)
{
if (e.Button == System.Windows.Forms.MouseButtons.None && IsCtrlPressed)
{
// radChartView1.Zoom(3, 1);
}
IsCtrlPressed = false;
}
}
On the other hand, you can make zoom to the
specific area of mouse location:
public partial class Form1 : RadForm
{
private Random rnd = new Random();
public Form1()
{
InitializeComponent();
BarSeries bar = new BarSeries();
for (int i = 0; i < 5; i++)
{
CategoricalDataPoint point = new CategoricalDataPoint();
point.Category = (char)(65 + i);
point.Value = i * 10;
bar.DataPoints.Add(point);
}
this.radChartView1.Series.Add(bar);
this.radChartView1.MouseWheel += radChartView1_MouseWheel;
}
private void radChartView1_MouseWheel(object sender, System.Windows.Forms.MouseEventArgs e)
{
SizeF newZoom = new SizeF(1f, 1f);
if (e.Delta > 0)
{
// zoom in
newZoom.Width = (float)((IChartView)this.radChartView1.View).ZoomWidth * 1.1f;
}
else
{
// zoom out
float xZoom = (float)((IChartView)this.radChartView1.View).ZoomWidth / 1.1f;
if (xZoom >= 1)
{
newZoom.Width = xZoom;
}
else
{
newZoom.Width = 1; // zoom out to max
}
}
double oldStretchedAreaWidth = this.radChartView1.View.Viewport.Width * ((IChartView)this.radChartView1.View).ZoomWidth;
Point point = e.Location;
double ratio = (point.X - ((IChartView)this.radChartView1.View).PlotOriginX) / oldStretchedAreaWidth;
this.radChartView1.Zoom(newZoom.Width, newZoom.Height);
double newStretchedAreaWidth = this.radChartView1.View.Viewport.Width * newZoom.Width;
double panOffset = ratio * newStretchedAreaWidth - point.X;
this.radChartView1.Pan(-panOffset, 0);
}
}
I hope this information helps. Should you have further questions, I would be glad to help.
Regards,
Desislava
Telerik
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