学步园

Code
using System; 
using System.IO; 
using System.Drawing; 
using System.Drawing.Imaging; 
using System.Collections; 
using System.ComponentModel; 
using System.Windows.Forms; 
using System.Data; 
  
namespace TransparentGifCreator 
{ 
  /**//// <summary> 
  /// Summary description for Form1. 
  /// </summary> 
  public class Form1 : System.Windows.Forms.Form 
  { 
private System.Windows.Forms.PictureBox pictureBox1; 
private System.Windows.Forms.Panel panel1; 
private System.Windows.Forms.Button button1; 
private System.Windows.Forms.Button button2; 
private System.Windows.Forms.Button button3; 
private System.ComponentModel.IContainer components; 
  
Image _gifImage; 
private System.Windows.Forms.Timer timer1; 
ColorPalette cp; 
int CurrentEntry; 
  
public Form1() 
{ 
// 
// Required for Windows Form Designer support 
// 
InitializeComponent(); 
  
// 
// TODO: Add any constructor code after InitializeComponent call 
// 
} 
  
/**//// <summary> 
/// Clean up any resources being used. 
/// </summary> 
protected override void Dispose( bool disposing ) 
{ 
if( disposing ) 
{ 
if (components != null) 
{ 
components.Dispose(); 
} 
} 
base.Dispose( disposing ); 
} 
  
Windows Form Designer generated code#region Windows Form Designer generated code 
/**//// <summary> 
/// Required method for Designer support - do not modify 
/// the contents of this method with the code editor. 
/// </summary> 
private void InitializeComponent() 
{ 
this.components = new System.ComponentModel.Container(); 
this.pictureBox1 = new System.Windows.Forms.PictureBox(); 
this.panel1 = new System.Windows.Forms.Panel(); 
this.button1 = new System.Windows.Forms.Button(); 
this.button2 = new System.Windows.Forms.Button(); 
this.button3 = new System.Windows.Forms.Button(); 
this.timer1 = new System.Windows.Forms.Timer(this.components); 
this.SuspendLayout(); 
// 
// pictureBox1 
// 
this.pictureBox1.Location = new System.Drawing.Point(96, 8); 
this.pictureBox1.Name = "pictureBox1"; 
this.pictureBox1.Size = new System.Drawing.Size(144, 144); 
this.pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage; 
this.pictureBox1.TabIndex = 0; 
this.pictureBox1.TabStop = false; 
// 
// panel1 
// 
this.panel1.Location = new System.Drawing.Point(8, 168); 
this.panel1.Name = "panel1"; 
this.panel1.Size = new System.Drawing.Size(144, 144); 
this.panel1.TabIndex = 1; 
this.panel1.Click += new System.EventHandler(this.panel1_Click); 
this.panel1.Paint += new System.Windows.Forms.PaintEventHandler(this.panel1_Paint); 
this.panel1.MouseMove += new System.Windows.Forms.MouseEventHandler(this.panel1_MouseMove); 
// 
// button1 
// 
this.button1.Location = new System.Drawing.Point(200, 176); 
this.button1.Name = "button1"; 
this.button1.Size = new System.Drawing.Size(88, 24); 
this.button1.TabIndex = 2; 
this.button1.Text = "Open"; 
this.button1.Click += new System.EventHandler(this.button1_Click); 
// 
// button2 
// 
this.button2.Location = new System.Drawing.Point(200, 216); 
this.button2.Name = "button2"; 
this.button2.Size = new System.Drawing.Size(88, 24); 
this.button2.TabIndex = 2; 
this.button2.Text = "Save"; 
this.button2.Click += new System.EventHandler(this.button2_Click); 
// 
// button3 
// 
this.button3.Location = new System.Drawing.Point(200, 256); 
this.button3.Name = "button3"; 
this.button3.Size = new System.Drawing.Size(88, 24); 
this.button3.TabIndex = 2; 
this.button3.Text = "Exit"; 
this.button3.Click += new System.EventHandler(this.button3_Click); 
// 
// timer1 
// 
this.timer1.Enabled = true; 
this.timer1.Interval = 250; 
this.timer1.Tick += new System.EventHandler(this.timer1_Tick); 
// 
// Form1 
// 
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); 
this.ClientSize = new System.Drawing.Size(328, 325); 
this.Controls.Add(this.button1); 
this.Controls.Add(this.panel1); 
this.Controls.Add(this.pictureBox1); 
this.Controls.Add(this.button2); 
this.Controls.Add(this.button3); 
this.Name = "Form1"; 
this.Text = "Form1"; 
this.ResumeLayout(false); 
  
} 
#endregion 
  
/**//// <summary> 
/// The main entry point for the application. 
/// </summary> 
[STAThread] 
static void Main() 
{ 
Application.Run(new Form1()); 
} 
  
private void panel1_Paint(object sender, System.Windows.Forms.PaintEventArgs e) 
{ 
if(cp==null) 
return; 
  
for(float y=0;y<16;y++) 
for(float x=0;x<16;x++) 
{ 
Color c=Color.Black; 
if( ((16*y) + x)<cp.Entries.Length) 
c=cp.Entries[(int)((16*y)+x)]; 
SolidBrush sb=new SolidBrush(Color.FromArgb(255,c)); 
float w=((float)this.panel1.Width)/16; 
float h=((float)this.panel1.Height)/16; 
e.Graphics.FillRectangle(sb,w*x,h*y,w,h); 
if(c.A!=255) 
{ 
if(showTrans) 
e.Graphics.DrawRectangle(Pens.Black,w*x,h*y,w-1,h-1); 
else 
e.Graphics.DrawRectangle(Pens.White,w*x,h*y,w-1,h-1); 
} 
  
sb.Dispose(); 
} 
} 
  
  
private void panel1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e) 
{ 
int y=(int)(((float)e.Y)/(((float)this.panel1.Width)/16f)); 
int x=(int)(((float)e.X)/(((float)this.panel1.Height)/16f)); 
CurrentEntry=(int)((16*y)+x); 
if(cp!=null) 
{ 
if(CurrentEntry>=cp.Entries.Length) 
CurrentEntry=cp.Entries.Length-1; 
//Little bit of diagnostic for the palette chooser below 
//System.Diagnostics.Trace.WriteLine(string.Format("{0},{1}, adjusted={4},{5} entry={2} Colour={3}",e.X,e.Y,CurrentEntry,cp.Entries[CurrentEntry].ToString(),x,y)); 
} 
} 
  
private void panel1_Click(object sender, System.EventArgs e) 
{ 
//Creates a new GIF image with a modified colour palette 
if(cp!=null) 
{ 
//Create a new 8 bit per pixel image 
Bitmap bm=new Bitmap(_gifImage.Width,_gifImage.Height,PixelFormat.Format8bppIndexed); 
//get it's palette 
ColorPalette ncp=bm.Palette; 
  
//copy all the entries from the old palette removing any transparency 
int n=0; 
foreach(Color c in cp.Entries) 
ncp.Entries[n++]=Color.FromArgb(255,c); 
  
//Set the newly selected transparency 
ncp.Entries[CurrentEntry]=Color.FromArgb(0,cp.Entries[CurrentEntry]); 
//re-insert the palette 
bm.Palette=ncp; 
  
//now to copy the actual bitmap data