コード例 #1
0
        /// <summary>
        /// Get the color data in the region of rectangle
        /// </summary>
        /// <param name="bitmap">The picture you wang to get color from</param>
        /// <param name="rect">The region that will be calculated</param>
        /// <returns></returns>
        private imgdata getData(Bitmap bitmap, Rectangle rect)
        {
            BitmapData data   = bitmap.LockBits(rect, ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
            int        nbyte  = data.Width * data.Height;
            imgdata    d      = new imgdata(nbyte);
            int        index  = 0;
            int        offset = data.Stride - bitmap.Width * 3 + rect.Left * 3 + rect.Right * 3;

            unsafe
            {
                byte *ptr = (byte *)(void *)data.Scan0;
                for (int i = 0; i < data.Height; i++)
                {
                    for (int j = 0; j < data.Width; j++)
                    {
                        d.b[index] = *ptr;
                        ptr++;
                        d.g[index] = *ptr;
                        ptr++;
                        d.r[index] = *ptr;
                        ptr++;
                        index++;
                    }
                    ptr += offset;
                }
            }

            bitmap.UnlockBits(data);
            return(d);
        }
コード例 #2
0
        /// <summary>
        /// Get the average color in the region of rectangle
        /// </summary>
        /// <param name="bitmap">The picture you wang to get color from</param>
        /// <param name="rect">The region that will be calculated</param>
        /// <returns></returns>
        public Color getAverage(Bitmap bitmap, Rectangle r)
        {
            imgdata d = getData(bitmap, r);
            int     bs = 0, gs = 0, rs = 0;

            for (int i = 0; i < d.index; i++)
            {
                bs += d.b[i];
                gs += d.g[i];
                rs += d.r[i];
            }
            return(Color.FromArgb(rs / d.index, gs / d.index, rs / d.index));
        }