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public Form1()
{
InitializeComponent();
this.TransparencyKey = this.BackColor;
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void Form1_Paint(object sender, PaintEventArgs e)
{
System.Drawing.Graphics g1 = this.CreateGraphics();
g1.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
System.Drawing.Color Mycolor = System.Drawing.Color.FromArgb(128, Color.Yellow);//说明:1-(128/255)=1-0.5=0.5 透明度为0.5,即50%
System.Drawing.SolidBrush sb1 = new System.Drawing.SolidBrush(Mycolor);
g1.FillRectangle(sb1, 0, 0, 550, 550); //半透明矩形
g1.FillEllipse(sb1, 20, 20, 100, 100); //半透明效果
g1.FillEllipse(Brushes.Yellow, 120, 20, 100, 100); //实色效果
sb1.Dispose();
}
}