CompositingMode.SourceOver
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class AlphaBCompGammaCorr
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 g As Graphics = Me.CreateGraphics()
g.Clear(Me.BackColor)
Dim rect1 As New Rectangle(20, 20, 100, 100)
Dim rect2 As New Rectangle(200, 20, 100, 100)
Dim redBrush As New SolidBrush(Color.FromArgb(150, 255, 0, 0))
Dim greenBrush As New SolidBrush(Color.FromArgb(180, 0, 255, 0))
Dim tempBmp As New Bitmap(200, 150)
Dim tempGraphics As Graphics = Graphics.FromImage(tempBmp)
tempGraphics.CompositingMode = CompositingMode.SourceOver
tempGraphics.CompositingQuality = CompositingQuality.GammaCorrected
tempGraphics.FillRectangle(redBrush, rect1)
rect1.X += 30
rect1.Y += 30
tempGraphics.FillEllipse(greenBrush, rect1)
g.CompositingQuality = CompositingQuality.GammaCorrected
g.DrawImage(tempBmp, 0, 0)
g.FillRectangle(Brushes.Red, rect2)
rect2.X += 30
rect2.Y += 30
g.FillEllipse(Brushes.Green, rect2)
tempBmp.Dispose()
g.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
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