[johnsuna(阿山NET)的专栏]怎么利用C#创建透明的GIF图片?(可自定义调色板),收藏一下.

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怎么利用C#创建透明的GIF图片

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 );
}

#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
//lock the source and destination bits
BitmapData src=((Bitmap)_gifImage).LockBits(new Rectangle(0,0,_gifImage.Width,_gifImage.Height),ImageLockMode.ReadOnly,_gifImage.PixelFormat);
BitmapData dst=bm.LockBits(new Rectangle(0,0,bm.Width,bm.Height),ImageLockMode.WriteOnly,bm.PixelFormat);

//uses pointers so we need unsafe code.
//the project is also compiled with /unsafe
unsafe
{
//steps through each pixel
for(int y=0;y<_gifImage.Height;y++)
for(int x=0;x<_gifImage.Width;x++)
{
//transferring the bytes
((byte *)dst.Scan0.ToPointer())[(dst.Stride*y)+x]=((byte *)src.Scan0.ToPointer())[(src.Stride*y)+x];
}
}

//all done, unlock the bitmaps
((Bitmap)_gifImage).UnlockBits(src);
bm.UnlockBits(dst);

//clear out the picturebox
this.pictureBox1.Image=null;
_gifImage.Dispose();
//set the new image in place
_gifImage=bm;
cp=_gifImage.Palette;
this.pictureBox1.Image=_gifImage;
}
}

private void button1_Click(object sender, System.EventArgs e)
{
OpenFileDialog dlg=new OpenFileDialog();
dlg.Filter="GIF files|*.GIF";
if(dlg.ShowDialog()==DialogResult.OK)
{
_gifImage=Image.FromFile(dlg.FileName);
this.pictureBox1.Image=_gifImage;
cp=_gifImage.Palette;
this.panel1.Invalidate();
}
}

private void button2_Click(object sender, System.EventArgs e)
{
SaveFileDialog dlg=new SaveFileDialog();
dlg.Filter="GIF files|*.gif";
dlg.DefaultExt=".gif";
dlg.AddExtension=true;
if(dlg.ShowDialog()==DialogResult.OK)
{
_gifImage.Save(dlg.FileName,ImageFormat.Gif);
}
}

private void button3_Click(object sender, System.EventArgs e)
{
Application.Exit();
}

bool showTrans;

private void timer1_Tick(object sender, System.EventArgs e)
{
showTrans^=true;
Graphics g=this.panel1.CreateGraphics();
//I do this rather than invalidate the panel because
//the panel draws its background ans so flickers horribly.
PaintEventArgs pe=new PaintEventArgs(g,new Rectangle(0,0,this.panel1.Width,this.panel1.Height));
this.panel1_Paint(this,pe);
g.Dispose();
}
}
}
-----------------------------------

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 );

}

#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

//lock the source and destination bits

BitmapData src=((Bitmap)_gifImage).LockBits(new Rectangle(0,0,_gifImage.Width,_gifImage.Height),ImageLockMode.ReadOnly,_gifImage.PixelFormat);

BitmapData dst=bm.LockBits(new Rectangle(0,0,bm.Width,bm.Height),ImageLockMode.WriteOnly,bm.PixelFormat);

//uses pointers so we need unsafe code.

//the project is also compiled with /unsafe

unsafe

{

//steps through each pixel

for(int y=0;y<_gifImage.Height;y++)

for(int x=0;x<_gifImage.Width;x++)

{

//transferring the bytes

((byte *)dst.Scan0.ToPointer())[(dst.Stride*y)+x]=((byte *)src.Scan0.ToPointer())[(src.Stride*y)+x];

}

}

//all done, unlock the bitmaps

((Bitmap)_gifImage).UnlockBits(src);

bm.UnlockBits(dst);

//clear out the picturebox

this.pictureBox1.Image=null;

_gifImage.Dispose();

//set the new image in place

_gifImage=bm;

cp=_gifImage.Palette;

this.pictureBox1.Image=_gifImage;

}

}

private void button1_Click(object sender, System.EventArgs e)

{

OpenFileDialog dlg=new OpenFileDialog();

dlg.Filter="GIF files|*.GIF";

if(dlg.ShowDialog()==DialogResult.OK)

{

_gifImage=Image.FromFile(dlg.FileName);

this.pictureBox1.Image=_gifImage;

cp=_gifImage.Palette;

this.panel1.Invalidate();

}

}

private void button2_Click(object sender, System.EventArgs e)

{

SaveFileDialog dlg=new SaveFileDialog();

dlg.Filter="GIF files|*.gif";

dlg.DefaultExt=".gif";

dlg.AddExtension=true;

if(dlg.ShowDialog()==DialogResult.OK)

{

_gifImage.Save(dlg.FileName,ImageFormat.Gif);

}

}

private void button3_Click(object sender, System.EventArgs e)

{

Application.Exit();

}

bool showTrans;

private void timer1_Tick(object sender, System.EventArgs e)

{

showTrans^=true;

Graphics g=this.panel1.CreateGraphics();

//I do this rather than invalidate the panel because

//the panel draws its background ans so flickers horribly.

PaintEventArgs pe=new PaintEventArgs(g,new Rectangle(0,0,this.panel1.Width,this.panel1.Height));

this.panel1_Paint(this,pe);

g.Dispose();

}

}

}

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