C# 实现QQ式截图功能实例代码

第二部分是辅助方法类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
namespace ImageClassLib
{
  public class ImageCut1
  {
    #region 剪裁图片方法
    /// <summary> 
    /// 剪裁 -- 用GDI+ 
    /// </summary> 
    /// <param name="b">原始Bitmap,即需要裁剪的图片</param> 
    /// <param name="StartX">开始坐标X</param> 
    /// <param name="StartY">开始坐标Y</param> 
    /// <param name="iWidth">宽度</param> 
    /// <param name="iHeight">高度</param> 
    /// <returns>剪裁后的Bitmap</returns> 
    public Bitmap KiCut1(Bitmap b) 
    { 
      if (b == null) 
      { 
        return null; 
      } 
    
      int w = b.Width; 
      int h = b.Height; 
    
      if (X >= w || Y >= h) 
      { 
        return null; 
      } 
    
      if (X + Width > w) 
      { 
        Width = w - X; 
      } 
    
      if (Y + Height > h) 
      { 
        Height = h - Y; 
      } 
    
      try
      { 
        Bitmap bmpOut = new Bitmap(Width, Height, PixelFormat.Format24bppRgb); 
    
        Graphics g = Graphics.FromImage(bmpOut);
        // Create rectangle for displaying image.
        Rectangle destRect = new Rectangle(0, 0, Width, Height);    //所画的矩形正确，它指定所绘制图像的位置和大小。 将图像进行缩放以适合该矩形。

        // Create rectangle for source image.
        Rectangle srcRect = new Rectangle(X, Y, Width, Height);   //srcRect参数指定要绘制的 image 对象的矩形部分。 将此部分进行缩放以适合 destRect 参数所指定的矩形。

        g.DrawImage(b, destRect, srcRect, GraphicsUnit.Pixel);
        //resultG.DrawImage(initImage, new System.Drawing.Rectangle(0, 0, side, side), new System.Drawing.Rectangle(0, 0, initWidth, initHeight), System.Drawing.GraphicsUnit.Pixel);
        g.Dispose(); 
        return bmpOut; 
      } 
      catch
      { 
        return null; 
      } 
    }
    #endregion
    #region ImageCut1类的构造函数
    public int X; 
    public int Y; 
    public int Width ; 
    public int Height;
    /// <summary>
    /// ImageCut1类的构造函数，ImageCut1类用来获取鼠标在pictureBox1控件所画矩形内的图像
    /// </summary>
    /// <param name="x表示鼠标在pictureBox1控件上按下时的横坐标"></param>
    /// <param name="y表示鼠标在pictureBox1控件上按下时的纵坐标"></param>
    /// <param name="width表示鼠标在pictureBox1控件上松开鼠标的宽度"></param>
    /// <param name="heigth表示鼠标在pictureBox1控件上松开鼠标的高度"></param>
    public ImageCut1(int x, int y, int width, int heigth)
    {
      X = x;
      Y = y;
      Width = width;
      Height = heigth;
    }
    #endregion
  }
}

								 
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