using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Drawing.Drawing2D;
namespace Alpha混色
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;
public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();
//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
Windows Form Designer generated code
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
protected override void OnPaint(PaintEventArgs e)
{
Graphics g= e.Graphics;
//创建一个填充矩形
SolidBrush brush=new SolidBrush(Color.BlueViolet);
g.FillRectangle(brush, 180, 70, 200, 150);
//创建一个位图,其中的两个矩形之间有透明效果
Bitmap bm1=new Bitmap(200, 100);
Graphics bg1= Graphics.FromImage(bm1);
SolidBrush redBrush=new SolidBrush(Color.FromArgb(210, 255, 0, 0));
SolidBrush greenBrush=new SolidBrush(Color.FromArgb(210, 0, 255, 0));
bg1.FillRectangle(redBrush, 0, 0, 150, 70);
bg1.FillRectangle(greenBrush, 30, 30, 150, 70);
g.DrawImage(bm1, 100, 50);
//创建第二个位图,其中两个矩形之间没有透明效果
Bitmap bm2=new Bitmap(200, 100);
Graphics bg2= Graphics.FromImage(bm2);
bg2.CompositingMode = CompositingMode.SourceCopy;
bg2.FillRectangle(redBrush, 0, 0, 150, 70);
bg2.FillRectangle(greenBrush, 30, 30, 150, 70);
g.CompositingQuality = CompositingQuality.GammaCorrected;
//g.CompositingMode = CompositingMode.SourceCopy;
g.DrawImage(bm2, 300, 100);
Bitmap bm3=new Bitmap(200, 100);
Graphics bg3= Graphics.FromImage(bm3);
redBrush=new SolidBrush(Color.FromArgb(100, 255, 0, 0));
greenBrush=new SolidBrush(Color.FromArgb(100, 0, 255, 0));
bg3.FillRectangle(redBrush, 0, 0, 150, 70);
bg3.FillRectangle(greenBrush, 30, 30, 150, 70);
g.DrawImage(bm3, 100, 150);
}
}
}