To create a zoom effect with the chart, simply adjust the axis. For example, you can add two button controls (Zoom in and Zoom out buttons) to your application which will adjust the axis at run time when each is pressed. Here is a code example showing how to handle the Button_Click events to control zooming:
To write code in Visual Basic
| Visual Basic |
Copy Code
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' Controls zooming in
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim xMin As Double = Me.C1Chart1.ChartArea.AxisX.Min
Dim xMax As Double = Me.C1Chart1.ChartArea.AxisX.Max
Dim xChange As Double = (xMax - xMin) * 0.05
Me.C1Chart1.ChartArea.AxisX.Min = xMin + xChange
Me.C1Chart1.ChartArea.AxisX.Max = xMax - xChange
Dim yMin As Double = Me.C1Chart1.ChartArea.AxisY.Min()
Dim yMax As Double = Me.C1Chart1.ChartArea.AxisY.Max
Dim yChange As Double = (yMax - yMin) * 0.05
Me.C1Chart1.ChartArea.AxisY.Min = yMin + yChange
Me.C1Chart1.ChartArea.AxisY.Max = yMax - yChange
End Sub
'' Controls zooming out
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim xMin As Double = Me.C1Chart1.ChartArea.AxisX.Min
Dim xMax As Double = Me.C1Chart1.ChartArea.AxisX.Max
Dim xChange As Double = (xMax - xMin) * 0.05
Me.C1Chart1.ChartArea.AxisX.Min = xMin - xChange
Me.C1Chart1.ChartArea.AxisX.Max = xMax + xChange
Dim yMin As Double = Me.C1Chart1.ChartArea.AxisY.Min()
Dim yMax As Double = Me.C1Chart1.ChartArea.AxisY.Max
Dim yChange As Double = (yMax - yMin) * 0.05
Me.C1Chart1.ChartArea.AxisY.Min = yMin - yChange
Me.C1Chart1.ChartArea.AxisY.Max = yMax + yChange
End Sub
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To write code in C#
| C# |
Copy Code
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'// Controls zooming in
private void button1_Click(object sender, System.EventArgs e)
{
double xMin = this.c1Chart1.ChartArea.AxisX.Min;
double xMax = this.c1Chart1.ChartArea.AxisX.Max;
double xChange = (xMax - xMin) * 0.05;
this.c1Chart1.ChartArea.AxisX.Min = xMin + xChange;
this.c1Chart1.ChartArea.AxisX.Max = xMax - xChange;
double yMin = this.C1Chart1.ChartArea.AxisY.Min();
double yMax = this.C1Chart1.ChartArea.AxisY.Max;
double yChange = (yMax - yMin) * 0.05;
this.c1Chart1.ChartArea.AxisY.Min = yMin + yChange;
this.c1Chart1.ChartArea.AxisY.Max = yMax - yChange;
}
'// Controls zooming out
private void button2_Click(object sender, System.EventArgs e)
{
double xMin = this.c1Chart1.ChartArea.AxisX.Min;
double xMax = this.c1Chart1.ChartArea.AxisX.Max;
double xChange = (xMax - xMin) * 0.05;
this.c1Chart1.ChartArea.AxisX.Min = xMin - xChange;
this.c1Chart1.ChartArea.AxisX.Max = xMax + xChange;
double yMin = this.c1Chart1.ChartArea.AxisY.Min();
double yMax = this.c1Chart1.ChartArea.AxisY.Max;
double yChange = (yMax - yMin) * 0.05;
this.c1Chart1.ChartArea.AxisY.Min = yMin - yChange;
this.c1Chart1.ChartArea.AxisY.Max = yMax + yChange;
}
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