象yhoo相册那样在网页上操作图片(不完全)_3

图片显示页面(MyImg.aspx)后台代码:

private void Page_Load(object sender, System.EventArgs e)
        {
            // 在此处放置用户代码以初始化页面
            if(!Page.IsPostBack)
            {
                ChangImg();
            }
        }
        private void ChangImg()
        {
            string strFilename=string.Empty;
            System.Drawing.Image  oldImg;
            ImageAttributes ia=new ImageAttributes();
            strFilename = Server.MapPath("img/"+Request.QueryString["filename"]);
            oldImg = System.Drawing.Image.FromFile(strFilename);
            Graphics g = System.Drawing.Graphics.FromImage(oldImg);                

            亮度和对比度#region 亮度和对比度
            float[][] am = new float[5][];
            float[][] bm = new float[5][];
            for (int i = 0; i < 5; i++)
            {
                am[i] = new float[5];
                bm[i] = new float[5];
            }
            //初始化亮度
            float contrast = 1f;
            float T = 0.5f * (1f - contrast);
            am[0][0] = contrast; am[0][1] = 0; am[0][2] = 0; am[0][3] = 0; am[0][4] = 0;
            am[1][0] = 0; am[1][1] = contrast; am[1][2] = 0; am[1][3] = 0; am[1][4] = 0;
            am[2][0] = 0; am[2][1] = 0; am[2][2] = contrast; am[2][3] = 0; am[2][4] = 0;
            am[3][0] = 0; am[3][1] = 0; am[3][2] = 0; am[3][3] = 1; am[3][4] = 0;
            am[4][0] = T; am[4][1] = T; am[4][2] = T; am[4][3] = 1; am[4][4] = 1;
            if(Request.QueryString["Bright"]!=null)
            {
                亮度#region 亮度                    
                //亮度
                contrast = float.Parse(Request.QueryString["Bright"]);
                T = 0.5f * (1f - contrast);
                am[0][0] = contrast; am[0][1] = 0; am[0][2] = 0; am[0][3] = 0; am[0][4] = 0;
                am[1][0] = 0; am[1][1] = contrast; am[1][2] = 0; am[1][3] = 0; am[1][4] = 0;
                am[2][0] = 0; am[2][1] = 0; am[2][2] = contrast; am[2][3] = 0; am[2][4] = 0;
                am[3][0] = 0; am[3][1] = 0; am[3][2] = 0; am[3][3] = 1; am[3][4] = 0;
                am[4][0] = T; am[4][1] = T; am[4][2] = T; am[4][3] = 1; am[4][4] = 1;
                #endregion
            }

            //初始化对比度
            float brightness = 0f;
            bm[0][0] = 1; bm[0][1] = 0; bm[0][2] = 0; bm[0][3] = 0; bm[0][4] = 0;
            bm[1][0] = 0; bm[1][1] = 1; bm[1][2] = 0; bm[1][3] = 0; bm[1][4] = 0;
            bm[2][0] = 0; bm[2][1] = 0; bm[2][2] = 1; bm[2][3] = 0; bm[2][4] = 0;
            bm[3][0] = 0; bm[3][1] = 0; bm[3][2] = 0; bm[3][3] = 1; bm[3][4] = 0;
            bm[4][0] = brightness; bm[4][1] = brightness;
            bm[4][2] = brightness; bm[4][3] = 1; bm[4][4] = 1;
            if(Request.QueryString["Contrast"]!=null)
            {
                对比度#region 对比度                
                //对比度
                brightness = float.Parse(Request.QueryString["Contrast"]);
                bm[0][0] = 1; bm[0][1] = 0; bm[0][2] = 0; bm[0][3] = 0; bm[0][4] = 0;
                bm[1][0] = 0; bm[1][1] = 1; bm[1][2] = 0; bm[1][3] = 0; bm[1][4] = 0;
                bm[2][0] = 0; bm[2][1] = 0; bm[2][2] = 1; bm[2][3] = 0; bm[2][4] = 0;
                bm[3][0] = 0; bm[3][1] = 0; bm[3][2] = 0; bm[3][3] = 1; bm[3][4] = 0;
                bm[4][0] = brightness; bm[4][1] = brightness;
                bm[4][2] = brightness; bm[4][3] = 1; bm[4][4] = 1;
                #endregion
            }
            //bm=Multiply(am,bm);
            ColorMatrix cm=new ColorMatrix(Multiply(am,bm));

            //ColorMatrix cm=new ColorMatrix(new float[][]{new float[]{1,0,0,0,0},new float[]{0,1,0,0,0},new float[]{0,0,1,0,0},new float[]{0,0,0,1,0},new float[]{0.2f,0.2f,0.2f,1,1}});

            //use it in the image attributes
            ia.SetColorMatrix(cm);

            //draw the original to the temporary using the matrix
            g.DrawImage(oldImg,new Rectangle(0,0,oldImg.Width,oldImg.Height),0,0,oldImg.Width,oldImg.Height,GraphicsUnit.Pixel,ia);    

            #endregion
            if(Request.QueryString["ring"]!=null)
            {
                //旋转#region//旋转
                switch(Request.QueryString["ring"])
                {
                    case "Rotate90FlipNone":                        
                        oldImg.RotateFlip(System.Drawing.RotateFlipType.Rotate90FlipNone);
                        break;
                    case"Rotate180FlipNone":
                        oldImg.RotateFlip(System.Drawing.RotateFlipType.Rotate180FlipNone);
                        break;
                    case "Rotate270FlipNone":
                        oldImg.RotateFlip(System.Drawing.RotateFlipType.Rotate270FlipNone);
                        break;

                    case "Rotate90FlipX":
                        oldImg.RotateFlip(System.Drawing.RotateFlipType.Rotate90FlipX);
                        break;
                    case "Rotate180FlipX":
                        oldImg.RotateFlip(System.Drawing.RotateFlipType.Rotate180FlipX);
                        break;
                    case "Rotate270FlipX":
                        oldImg.RotateFlip(System.Drawing.RotateFlipType.Rotate270FlipX);
                        break;
                    case "RotateNoneFlipX":
                        oldImg.RotateFlip(System.Drawing.RotateFlipType.RotateNoneFlipX);
                        break;

                    case "Rotate90FlipY":
                        oldImg.RotateFlip(System.Drawing.RotateFlipType.Rotate90FlipY);
                        break;
                    case "Rotate180FlipY":
                        oldImg.RotateFlip(System.Drawing.RotateFlipType.Rotate180FlipY);
                        break;
                    case "Rotate270FlipY":
                        oldImg.RotateFlip(System.Drawing.RotateFlipType.Rotate270FlipY);
                        break;
                    case "RotateNoneFlipY":
                        oldImg.RotateFlip(System.Drawing.RotateFlipType.RotateNoneFlipY);
                        break;

                    case "Rotate90FlipXY":
                        oldImg.RotateFlip(System.Drawing.RotateFlipType.Rotate90FlipXY);
                        break;
                    case "Rotate180FlipXY":
                        oldImg.RotateFlip(System.Drawing.RotateFlipType.Rotate180FlipXY);
                        break;
                    case "Rotate270FlipXY":
                        oldImg.RotateFlip(System.Drawing.RotateFlipType.Rotate270FlipXY);
                        break;
                    case "RotateNoneFlipXY":
                        oldImg.RotateFlip(System.Drawing.RotateFlipType.RotateNoneFlipXY);
                        break;
                }
                #endregion
            }
                
            oldImg.Save(Response.OutputStream,System.Drawing.Imaging.ImageFormat.Jpeg);
            g.Dispose();
            ia.Dispose();
            oldImg.Dispose();
        }
        private System.Drawing.Image ChangImgBrCon(System.Drawing.Image oldImg,System.Drawing.Image newImg)
        {
            return null;
        }
        private float[][] Multiply(float[][] f1, float[][] f2)
        {
            //合并
            float[][] X = new float[5][];
            for (int d = 0; d < 5; d++)
                X[d] = new float[5];
            int size = 5;
            float[] column = new float[5];
            for (int j = 0; j < 5; j++)
            {
                for (int k = 0; k < 5; k++)
                {
                    column[k] = f1[k][j];
                }
                for (int i = 0; i < 5; i++)
                {
                    float[] row = f2[i];
                    float s = 0;
                    for (int k = 0; k < size; k++)
                    {
                        s += row[k] * column[k];
                    }
                    X[i][j] = s;
                } 
            }
            return X;
        }