001 /*
002 * 由SharpDevelop创建。
003 * 用户： Lazynight
004 * 日期: 2011/10/22
005 * 时间: 6:59
006 *
007 * 要改变这种模板请点击 工具|选项|代码编写|编辑标准头文件
008 */
009 using System;
010 using System.Collections.Generic;
011 using System.Drawing;
012 using System.Windows.Forms;
013 using System.ComponentModel;
014
015 namespace Lazy20_图像的遮罩效果
016 {
017     public partial class MainForm : Form
018     {
019         Bitmap Night_bitmap;//水平遮罩，垂直遮罩公用变量
020         public MainForm()
021         {
022             InitializeComponent();
023         }
024
025         void Button1Click(object sender, EventArgs e)
026         {
027             openFileDialog1.Filter= “*.jpg,*.jpeg,*.bmp,*.gif,*.ico,*.png,*.tif,*.wmf|*.jpg;*.jpeg;*.bmp;*.gif;*.ico;*.png;*.tif;*.wmf”;
028             //设置打开图像的类型
029             this.openFileDialog1.ShowDialog();//打开对话框
030             if(this.openFileDialog1.FileName.Trim()==“”)
031                 return;
032             try
033             {
034                 Bitmap Lazy_bitmap=new Bitmap(this.openFileDialog1.FileName);
035                 //得到原始大小的图像
036                 Night_bitmap=new Bitmap(Lazy_bitmap,this.pictureBox1.Width,this.pictureBox1.Height);
037                 this.pictureBox1.Image=Night_bitmap;
038             }
039             catch(Exception Err)
040             {
041                 MessageBox.Show(this,“打开图像文件错误”,“提示”,MessageBoxButtons.OK,MessageBoxIcon.Information);
042             }
043         }
044
045         void Button2Click(object sender, EventArgs e)
046         {
047             int Lazy_width=this.pictureBox1.Width;//图像宽度
048             int Lazy_height=this.pictureBox1.Height;//图像高度
049             Graphics Lazy_pic =this.pictureBox1.CreateGraphics();
050             //获取Graphics对象
051             Lazy_pic.Clear(Color.Red);//初始为红色
052             Bitmap Lazy_bitmap=new Bitmap(Lazy_width,Lazy_height);
053             int x=;
054             while(x<=Lazy_width/2)
055             {
056                 for(int i=;i<=Lazy_height-1;i++)
057                 {
058                     Lazy_bitmap.SetPixel(x,i,Night_bitmap.GetPixel(x,i));
059                     //上半部分自上而下遮盖，执行到图像一半
060                 }
061                 for(int i=;i<=Lazy_height-1;i++)
062                 {
063                     Lazy_bitmap.SetPixel(Lazy_width-x-1,i,Night_bitmap.GetPixel(Lazy_width-x-1,i));
064                     //下半部分自下而上遮盖，执行到图像一半
065                 }
066                 x++;
067                 this.pictureBox1.Refresh();//图像刷新
068                 this.pictureBox1.Image=Lazy_bitmap;
069                 System.Threading.Thread.Sleep(30);//通过挂起线程时间来控制遮盖的速度,此处为睡眠30/1000毫秒
070             }
071         }
072
073         void Button3Click(object sender, EventArgs e)
074         {
075             int Lazy_width=this.pictureBox1.Width;//图像宽度
076             int Lazy_height=this.pictureBox1.Height;//图像高度
077             Graphics Lazy_pic =this.pictureBox1.CreateGraphics();
078             //获取Graphics对象
079             Lazy_pic.Clear(Color.Red);//初始为红色
080             Bitmap Lazy_bitmap=new Bitmap(Lazy_width,Lazy_height);
081             int x=;
082             while(x<=Lazy_height/2)
083             {
084                 for(int i=;i<=Lazy_width-1;i++)
085                 {
086                     Lazy_bitmap.SetPixel(i,x,Night_bitmap.GetPixel(i,x));
087                     //上半部分自上而下遮盖，执行到图像一半
088                 }
089                 for(int i=;i<=Lazy_width-1;i++)
090                 {
091                     Lazy_bitmap.SetPixel(i,Lazy_height-x-1,Night_bitmap.GetPixel(i,Lazy_height-x-1));
092                     //下半部分自下而上遮盖，执行到图像一半
093                 }
094                 x++;
095                 this.pictureBox1.Refresh();//图像刷新
096                 this.pictureBox1.Image=Lazy_bitmap;
097                 System.Threading.Thread.Sleep(30);//通过挂起线程时间来控制遮盖的速度,此处为睡眠30/1000毫秒
098
099             }
100         }
101     }
102 }