silverlight2中实现图片合成

最近的项目中，由于要实现一个个性T恤或者瓷杯的DIY界面，允许用户自己上传图片，文字，叠放图片文字，等任意操作（当然在局部范围内），并保存为一个图片。目前silverlight中还没有图片合成的功能，因此可以将图片合成的一些参数传递到webclient或者wcf中进行合成，然后在传递回来。当然这样的效率不会很高，尤其是图片很多的时候。。

前台界面图，中间部分是合成时添加的自己的图片

下面是图片合成时的一些代码：

Title

using System;
using System.Web;
using System.Drawing;
using System.IO;
using System.Web.Services;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;

namespace ImageSnapperWeb
{
    public class PhotoHandler : IHttpHandler
    {
        private int intWdith;
        private int intHeight;
        private int intLeft;
        private int intTop;
        private int intOpacity;
        public void ProcessRequest(HttpContext context)
        {           
            String strPath1 = context.Request.QueryString["P1"];
            String strPath2 = context.Request.QueryString["P2"];
            String strPoing = context.Request.QueryString["P3"];
            String strNFN = System.DateTime.Now.ToString().Replace(" ", "").Replace(":", "").Replace("-", "").Replace("/", "");
            strNFN = strNFN + new Random().Next(100).ToString() + ".jpg";
            String fileName = HttpContext.Current.Server.MapPath(@"ClientBin/" + strPath1);
            String waterfileName = strPath2;
            Image img = System.Drawing.Image.FromFile(fileName);
            string[] arr = strPoing.Split(',');
            double fl = img.Height / 380.00;
            if (arr.Length == 5)
            {
                intWdith = int.Parse((double.Parse(arr[0]) * fl).ToString("f0"));
                intHeight = int.Parse((double.Parse(arr[1]) * fl).ToString("f0"));
                intLeft = int.Parse((double.Parse(arr[2]) * fl - 20).ToString("f0"));
                intTop = int.Parse((double.Parse(arr[3]) * fl + 150.00).ToString("f0"));
                intOpacity = int.Parse(arr[4]);
            }

            //合成图片
            System.Drawing.Image image = System.Drawing.Image.FromFile(HttpContext.Current.Server.MapPath(@"ClientBin/" + strPath1));
            System.Drawing.Image copyImage;
            copyImage = System.Drawing.Image.FromFile(HttpContext.Current.Server.MapPath(@"ClientBin/" + strPath2));

            //HttpContext.Current.Response.Write(copyImage+"<br>");
            Graphics g = Graphics.FromImage(image);
            //控制图片显示的大小和位置
            ImageAttributes imageAttributes = new ImageAttributes();
            ColorMap colorMap = new ColorMap();

            colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
            colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
            ColorMap[] remapTable = { colorMap };

            imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);

            float transparency = 0.5F;
            if (intOpacity >= 1 && intOpacity <= 10)
            {
                transparency = (intOpacity / 10.0F);
            }

            float[][] colorMatrixElements = {
                                                new float[] {1.0f,  0.0f,  0.0f,  0.0f, 0.0f},
                                                new float[] {0.0f,  1.0f,  0.0f,  0.0f, 0.0f},
                                                new float[] {0.0f,  0.0f,  1.0f,  0.0f, 0.0f},
                                                new float[] {0.0f,  0.0f,  0.0f,  transparency, 0.0f},
                                                new float[] {0.0f,  0.0f,  0.0f,  0.0f, 1.0f}
                                            };

            ColorMatrix colorMatrix = new ColorMatrix(colorMatrixElements);

            imageAttributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);

            g.DrawImage(copyImage, new Rectangle(intLeft, intTop, intHeight, intWdith), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel, imageAttributes);
            ////加文字
            //Font f = new Font("Verdana", 32);
            //Brush b = new SolidBrush(Color.Tomato);
            //string addText = "这是SilverLight图片合成测试！";
            //g.DrawString(addText, f, b, 10, 10);
            g.Dispose();

            //保存图片
            image.Save(HttpContext.Current.Server.MapPath(@"ClientBin/ImgOK/" + strNFN));
            image.Dispose();
            copyImage.Dispose();

            //Screen scr = Screen.PrimaryScreen;
            //Rectangle rc = scr.Bounds;
            //int iWidth = 400;
            //int iHeight = 400;
            ////创建一个和屏幕一样大的Bitmap
            //Image myImage = new Bitmap(iWidth, iHeight);
            ////从一个继承自Image类的对象中创建Graphics对象
            //Graphics g = Graphics.FromImage(myImage);
            ////抓屏并拷贝到myimage里           
            //g.CopyFromScreen(new Point(0, 0), new Point(0, 0), new Size(iWidth, iHeight));
            ////保存为文件
           
            //myImage.Save(HttpContext.Current.Server.MapPath(@"ClientBin/ImgOK/" + strNFN));

            context.Response.ContentType = "text/plain";
            context.Response.Write(strNFN);
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }

    }
}