C#多图层操作/新建一个bmpSystem.Drawing.Imagebitmap=newSystem.Drawing.Bitmap(width,height);/获取绘画句柄System.Drawing.Graphicsg=System.Drawing.Graphics.FromImage(bitmap);/设置高质量插值法g.InterpolationMode=System.Drawing.Drawing2D.InterpolationMode.High;/设置高质量呈现平滑程度g.SmoothingMode=System.Drawing.Drawing2D.SmoothingMode.HighQuality;/清空画布并以透明背景色填充g.Clear(System.Drawing.Color.Transparent);/在指定位置并且按指定大小绘制图片的指定部分g.DrawImage(originalImage,newSystem.Drawing.Rectangle(0,0,towidth,toheight),newSystem.Drawing.Rectangle(x,y,ow,oh),System.Drawing.GraphicsUnit.Pixel);