Shape.Paint イベント

[アーティクル]
08/22/2008

更新 : 2007 年 11 月

図形が再描画されるときに発生します。

名前空間 : Microsoft.VisualBasic.PowerPacks
アセンブリ : Microsoft.VisualBasic.PowerPacks.Vs (Microsoft.VisualBasic.PowerPacks.Vs.dll 内)

構文

'宣言
<BrowsableAttribute(True)> _
Public Event Paint As PaintEventHandler
'使用
Dim instance As Shape
Dim handler As PaintEventHandler

AddHandler instance.Paint, handler

[BrowsableAttribute(true)]
public event PaintEventHandler Paint

[BrowsableAttribute(true)]
public:
 event PaintEventHandler^ Paint {
    void add (PaintEventHandler^ value);
    void remove (PaintEventHandler^ value);
}

JScript では、イベントは使用できません。

解説

Paint イベントハンドラは、通常、図形が再描画されるときのカスタム描画の実行に使用されます。

イベントの処理方法の詳細については、「イベントの利用」を参照してください。

例

Paint イベントを使用して、RectangleShape コントロールに線を描画する方法を次の例に示します。この例では、RectangleShape1 という名前の RectangleShape コントロールがフォームに配置されている必要があります。

Private mousePath = New System.Drawing.Drawing2D.GraphicsPath()

Private Sub RectangleShape2_MouseDown(ByVal sender As Object, _
  ByVal e As System.Windows.Forms.MouseEventArgs) Handles _
  RectangleShape2.MouseDown
    Dim mouseDownLocation As New Point(e.X + RectangleShape2.Left, _
      e.Y + RectangleShape2.Top)
    ' Clear the previous line.
    mousePath.Dispose()
    mousePath = New System.Drawing.Drawing2D.GraphicsPath()
    RectangleShape2.Invalidate()
    ' Add a line to the graphics path.
    mousePath.AddLine(mouseDownLocation, mouseDownLocation)
End Sub

Private Sub RectangleShape2_MouseMove(ByVal sender As Object, _
  ByVal e As System.Windows.Forms.MouseEventArgs) _
  Handles RectangleShape2.MouseMove
    Dim mouseX As Integer = e.X + RectangleShape2.Left
    Dim mouseY As Integer = e.Y + RectangleShape2.Top
    ' Add a line to the graphics path.
    mousePath.AddLine(mouseX, mouseY, mouseX, mouseY)
End Sub

Private Sub RectangleShape2_MouseUp(ByVal sender As Object, _
  ByVal e As System.Windows.Forms.MouseEventArgs) _
  Handles RectangleShape2.MouseUp
    Dim mouseUpLocation = New System.Drawing.Point(e.X + _
      RectangleShape2.Left, e.Y + RectangleShape2.Top)
    ' Add a line to the graphics path.
    mousePath.Addline(mouseUpLocation, mouseUpLocation)
    ' Force the shape to redraw.
    RectangleShape2.Invalidate()
End Sub

Private Sub RectangleShape2_Paint(ByVal sender As Object, _
  ByVal e As System.Windows.Forms.PaintEventArgs) _
  Handles RectangleShape2.Paint
    ' Draw the line.
    e.Graphics.DrawPath(System.Drawing.Pens.DarkRed, mousePath)
End Sub

private System.Drawing.Drawing2D.GraphicsPath mousePath = 
    new System.Drawing.Drawing2D.GraphicsPath();

private void rectangleShape2_MouseDown(object sender, 
    System.Windows.Forms.MouseEventArgs e)
{
    Point mouseDownLocation = new Point(e.X + rectangleShape2.Left, 
        e.Y + rectangleShape2.Top);
    // Clear the previous line.
    mousePath.Dispose();
    mousePath = new System.Drawing.Drawing2D.GraphicsPath();
    rectangleShape2.Invalidate();
    // Add a line to the graphics path.
    mousePath.AddLine(mouseDownLocation, mouseDownLocation);
}

private void rectangleShape2_MouseMove(object sender, 
    System.Windows.Forms.MouseEventArgs e)
{
    int mouseX = e.X + rectangleShape2.Left;
    int mouseY = e.Y + rectangleShape2.Top;
    // Add a line to the graphics path.
    mousePath.AddLine(mouseX, mouseY, mouseX, mouseY);
}

private void rectangleShape2_MouseUp(object sender, 
    System.Windows.Forms.MouseEventArgs e)
{
    System.Drawing.Point mouseUpLocation = 
        new System.Drawing.Point(e.X + rectangleShape2.Left, 
            e.Y + rectangleShape2.Top);
    // Add a line to the graphics path.
    mousePath.AddLine(mouseUpLocation, mouseUpLocation);
    // Force the shape to redraw.
    rectangleShape2.Invalidate();
}

private void rectangleShape2_Paint(object sender, 
    System.Windows.Forms.PaintEventArgs e)
{
    // Draw the line.
    e.Graphics.DrawPath(System.Drawing.Pens.DarkRed, mousePath);
}