VB.Net by API/System.Drawing.Drawing2D/CompositingMode
CompositingMode.SourceOver
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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.rupositingMode = CompositingMode.SourceOver tempGraphics.rupositingQuality = CompositingQuality.GammaCorrected tempGraphics.FillRectangle(redBrush, rect1) rect1.X += 30 rect1.Y += 30 tempGraphics.FillEllipse(greenBrush, rect1) g.rupositingQuality = 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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