C#图像处理（剪切、合成、缩略）

我会带着你远行 2022-06-15 12:26 217阅读 0赞

using System;  
using System.Data;  
using System.Configuration;  
using System.Web;  
using System.Web.Security;  
using System.Web.UI;  
using System.Drawing;  
using System.Drawing.Drawing2D;  
using System.Drawing.Imaging;  
  
  
/// <summary>  
///图片处理类  
/// </summary>  
public class Images  
\{   
public Images()  
\{   
//  
//TODO: 在此处添加构造函数逻辑  
//  
\}  
    
    /// <summary>  
    /// 剪切图片  
    /// </summary>  
    /// <param name="path\_source">原始图片路径</param>  
    /// <param name="path\_save">目标图片路径</param>  
    /// <param name="x">剪切位置的左上角x坐标</param>  
    /// <param name="y">剪切位置的左上角y坐标</param>  
    /// <param name="width">要剪切的宽度</param>  
    /// <param name="height">要剪切的高度</param>  
    public void Cut(string path\_source, string path\_save, int x, int y, int width, int height)  
    \{   
        //加载底图  
        Image img = Image.FromFile(path\_source);  
        int w = img.Width;  
        int h = img.Height;  
        //设置画布  
        width = width >= w ? w : width;  
        height = height >= h ? h : height;  
        Bitmap map = new Bitmap(width, height);  
        //绘图  
        Graphics g = Graphics.FromImage(map);         
        g.DrawImage(img, 0, 0, new Rectangle(x,y, width, height), GraphicsUnit.Pixel);  
        //保存  
        map.Save(path\_save);      
  
    \}  
  
  
    /// <summary>  
    /// 生成缩略图  
    /// </summary>  
    /// <param name="path\_source">原始图片路径</param>  
    /// <param name="path\_save">缩略图路径</param>  
    /// <param name="times">缩略倍数</param>  
    /// <param name="b">缩略或放大（true缩略）</param>  
    public void Thumbnail(string path\_source, string path\_save, int times, bool b)  
    \{   
        //加载底图  
        Image img = Image.FromFile(path\_source);  
        int w = img.Width;  
        int h = img.Height;  
        //设置画布  
        int width = 0;  
        int height = 0;  
        if (b)  
        \{   
            width = w / times;  
            height = h / times;  
        \}  
        else  
        \{   
            width = w \* times;  
            height = h \* times;  
        \}  
        Bitmap map = new Bitmap(width, height);  
        //绘图  
        Graphics g = Graphics.FromImage(map);  
        g.DrawImage(img, 0, 0, width, height);  
        //保存  
        map.Save(path\_save);  
  
    \}  
  
  
    /// <summary>  
    /// 图片合成  
    /// </summary>  
    /// <param name="p1">图片1</param>  
    /// <param name="p2">图片2</param>  
    /// <param name="path\_save">新图片路径</param>  
    public void Compound(string p1, string p2, string path\_save)  
    \{   
        //加载底图  
        Image img1 = Image.FromFile(p1);  
        Image img2 = Image.FromFile(p2);  
  
  
        int w = img1.Width + img2.Width;  
        int h = img1.Height > img2.Height ? img1.Height : img2.Height;  
          
        //设置画布  
  
  
        Bitmap map = new Bitmap(w, h);  
        //绘图  
        Graphics g = Graphics.FromImage(map);  
        g.DrawImage(img1, 0, 0, new Rectangle(0, 0, img1.Width, img1.Height), GraphicsUnit.Pixel);  
        g.DrawImage(img2, img1.Width, 0, new Rectangle(0, 0, img2.Width, img2.Height), GraphicsUnit.Pixel);  
        //g.DrawImage(img, 0, 0, new Rectangle(0, 0, width, height), GraphicsUnit.Pixel);  
        //保存  
        map.Save(path\_save);       
    \}  
\}