Private Sub ScaleTransformFloat(ByVal e As PaintEventArgs)

    ' Set world transform of graphics object to rotate.
    e.Graphics.RotateTransform(30.0F)

    ' Then to scale, prepending to world transform.
    e.Graphics.ScaleTransform(3.0F, 1.0F)

    ' Draw scaled, rotated rectangle to screen.
    e.Graphics.DrawRectangle(New Pen(Color.Blue, 3), 50, 0, 100, 40)
End Sub

Private Sub ScaleTransformFloatMatrixOrder(ByVal e As PaintEventArgs)

    ' Set world transform of graphics object to rotate.
    e.Graphics.RotateTransform(30.0F)

    ' Then to scale, appending to world transform.
    e.Graphics.ScaleTransform(3.0F, 1.0F, MatrixOrder.Append)

    ' Draw rotated, scaled rectangle to screen.
    e.Graphics.DrawRectangle(New Pen(Color.Blue, 3), 50, 0, 100, 40)
End Sub

' 导入命名空间
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
Imports System.Math
public class DrawCurveSin
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class

public class Form1
  Inherits System.Windows.Forms.Form

  Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
        Dim a As Graphics =  e.Graphics
        Dim mypen As Pen
        Dim mypoints() As PointF
        Dim i As Integer
        Dim mycount As Integer

        mypen = New Pen(System.Drawing.Color.Red, 3)

        mycount = Me.Width / 10
        ReDim mypoints(mycount)

        For i = 1 To mycount
            mypoints(i).X = i * 10
            mypoints(i).Y = -1 * (Sin(i)) ^ 2 * Me.Height
        Next

        a = Me.CreateGraphics
        a.Clear(Me.BackColor)
        a.ScaleTransform(1, -1)
        a.DrawCurve(mypen, mypoints)

        a.Dispose()
        mypen.Dispose()
  End Sub

  Public Sub New()
    MyBase.New()
    Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
    Me.ClientSize = New System.Drawing.Size(292, 273)
    Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen

  End Sub

End Class