グラフでズーム効果を生み出すには、軸を調整するだけです。たとえば、２つのボタンコントロール（〈ズームイン〉ボタンと〈ズームアウト〉ボタン）をアプリケーションに追加し、Button_Click イベントに次のようなコードを設定します。
Visual Basic コードの書き方
| Visual Basic |
コードのコピー
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' ズームインを制御
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
' ズームアウトを制御
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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C# コードの書き方
| C# |
コードのコピー
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|---|---|
// ズームインを制御
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;
}
// ズームアウトを制御
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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