本文实例为大家分享了c#实现图片切割、切图的具体代码，供大家参考，具体内容如下
前台准备两个image控件。上面是显示原图，下面显示切割后的效果。
<stackpanel orientation= "vertical" >
<image width= "450" height= "383" source= "c:\users\administrator\documents\visual studio 2015\projects\splitpic\splitpic\images\1.jpg" />
<image x:name= "img" stretch= "none" width= "450" height= "383" />
</stackpanel>
对应的后台代码：
public partial class mainwindow : window
{
public mainwindow()
{
initializecomponent();
// 设置原图
img.source = new bitmapimage( new uri( @"images/1.jpg" , urikind.relative));
// 切割图片
imagesource imagesource = img.source;
bitmap bitmap = systemutils.imagesourcetobitmap(imagesource);
bitmapsource bitmapsource = systemutils.bitmaptobitmapimage(bitmap);
bitmapsource newbitmapsource = systemutils.cutimage(bitmapsource, new int32rect(125, 60, 235, 285));
// 使用切割后的图源
img.source = newbitmapsource;
}
}
// 图像工具类
public static class systemutils
{
/// <summary>
/// 切图
/// </summary>
/// <param name="bitmapsource">图源</param>
/// <param name="cut">切割区域</param>
/// <returns></returns>
public static bitmapsource cutimage(bitmapsource bitmapsource, int32rect cut)
{
//计算stride
var stride = bitmapsource.format.bitsperpixel * cut.width / 8;
//声明字节数组
byte [] data = new byte [cut.height * stride];
//调用copypixels
bitmapsource.copypixels(cut, data, stride, 0);
return bitmapsource.create(cut.width, cut.height, 0, 0, pixelformats.bgr32, null , data, stride);
}
// imagesource --> bitmap
public static system.drawing.bitmap imagesourcetobitmap(imagesource imagesource)
{
bitmapsource m = (bitmapsource)imagesource;
system.drawing.bitmap bmp = new system.drawing.bitmap(m.pixelwidth, m.pixelheight, system.drawing.imaging.pixelformat.format32bpppargb);
system.drawing.imaging.bitmapdata data = bmp.lockbits(
new system.drawing.rectangle(system.drawing.point.empty, bmp.size), system.drawing.imaging.imagelockmode.writeonly, system.drawing.imaging.pixelformat.format32bpppargb);
m.copypixels(int32rect.empty, data.scan0, data.height * data.stride, data.stride); bmp.unlockbits(data);
return bmp;
}
// bitmap --> bitmapimage
public static bitmapimage bitmaptobitmapimage(bitmap bitmap)
{
using (memorystream stream = new memorystream())
{
bitmap.save(stream, imageformat.bmp);
stream.position = 0;
bitmapimage result = new bitmapimage();
result.begininit();
// according to msdn, "the default ondemand cache option retains access to the stream until the image is needed."
// force the bitmap to load right now so we can dispose the stream.
result.cacheoption = bitmapcacheoption.onload;
result.streamsource = stream;
result.endinit();
result.freeze();
return result;
}
}
}
运行后的效果如下：
补充：关于剪裁的位置和区域的填写说明，如下图。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/qq_18995513/article/details/67637521
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