定点放大缩小图片思路或代码

Question

我知道您是真正高手

有代码可以节省多少时间啊

应该这是个经典问题

Answer 1

你好,能提供更多关于你问题的信息吗? 你想实现怎样的效果的?还有是什么项目类型,例如是WinForm还是Asp.Net？

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Answer 2

cad在想做的一个透明图片上蒙cad图，cad上的放大是框式，透明图平移后应以定点为中心放大才好校正已再次放大的cad。需c#winfom代码  用DramImage（）做放大，还是宽高乘一个数，一般哪种方法用适合又静准

Answer 3

使用两种方式都可以的，建议最好使用DrawImage的方式来实现，具体代码可以参考这个博客：

http://www.cnblogs.com/fengzhifengyi/archive/2011/05/12/2044224.html

/// <summary> 
    /// 放大缩小图片尺寸 
    /// </summary> 
    /// <param name="picPath"></param> 
    /// <param name="reSizePicPath"></param> 
    /// <param name="iSize"></param> 
    /// <param name="format"></param> 
    public void PicSized(string picPath, string reSizePicPath, int iSize, ImageFormat format) 
    { 
        Bitmap originBmp = new Bitmap(picPath); 
        int w = originBmp.Width * iSize; 
        int h = originBmp.Height * iSize; 
        Bitmap resizedBmp = new Bitmap(w, h); 
        Graphics g = Graphics.FromImage(resizedBmp); 
        //设置高质量插值法   
        g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; 
        //设置高质量,低速度呈现平滑程度   
        g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; 
        g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality; 
        //消除锯齿 
        g.SmoothingMode = SmoothingMode.AntiAlias; 
        g.DrawImage(originBmp, new Rectangle(0, 0, w, h), new Rectangle(0, 0, originBmp.Width, originBmp.Height), GraphicsUnit.Pixel); 
        resizedBmp.Save(reSizePicPath, format); 
        g.Dispose(); 
        resizedBmp.Dispose(); 
        originBmp.Dispose(); 
    }

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