SuperMap.Web.Mapping.HeatMapLayer.worker_DoWork C# (CSharp) Method

        private void worker_DoWork(object sender, DoWorkEventArgs e)
        {
            BackgroundWorker bgWorker = sender as BackgroundWorker;
            //hps, width, height, Radius, Intensity, stops, onCompleted
            object[] args = (object[])e.Argument;
            List<PixelPoint> points = (List<PixelPoint>)args[0];
            double res = (double)args[4];
            int width = (int)Math.Ceiling((int)args[1] * res);
            int height = (int)Math.Ceiling((int)args[2] * res);
            int radius = (int)Math.Ceiling((int)args[3] * res);
            List<ThreadSafeGradientStop> stops = (List<ThreadSafeGradientStop>)args[5];
            OnImageSourceCompleted onCompleted = (OnImageSourceCompleted)args[6];
            double mapReslution = (double)args[7];
            //地理半径
            int geoToScreenRadius;

            //if (radius % 2 == 0)
            //{
            //    radius++;
            //}
            //radius = radius * 2 + 1;
            ushort[] matrix = CreateDistanceMatrix(radius);
            int[] output = new int[width * height];
            foreach (PixelPoint p in points)
            {
                //如果当前点设置地理半径，就用这样的方法
                if (p.GeoRadius != 0 )
                {
                    geoToScreenRadius = (int)Math.Round(p.GeoRadius / mapReslution);
                    //如果显示的地理半径小于1像素则不进行显示
                    if (!(geoToScreenRadius < 1))
                    {
                        ushort[] matrixGeoRadius = CreateDistanceMatrix(geoToScreenRadius);
                        AddPoint(matrixGeoRadius, geoToScreenRadius, p.X, p.Y, p.Value, output, width);
                    }
                }
                else
                {
                    AddPoint(matrix, radius, p.X, p.Y, p.Value, output, width);
                }
                if (worker.CancellationPending)
                {
                    e.Cancel = true;
                    e.Result = null;
                    return;
                }
            }
            matrix = null;
            int max = 0;
            foreach (int val in output)
            {
                if (max < val)
                {
                    max = val;
                }
            }
            if (max < 2)
            {
                max = 2;
            }

            int[] pixels = new int[width * height];
            for (int i = 0; i < height; i++)      // Height (y)
            {
                for (int j = 0; j < width; j++)     // Width (x)
                {
                    Color c = InterpolateColor(output[i * width + j] / (float)max, stops);

                    if (c.A == 0)
                    {
                        pixels[i * width + j] = 0;
                    }
                    else
                    {
                        //byte[] brg = new byte[4] { c.B, c.G, c.R, c.A };
                        //int pixel = BitConverter.ToInt32(brg, 0);//ok
                        int pixel = (c.A << 24) | (c.R << 16) | (c.G << 8) | c.B;
                        pixels[i * width + j] = pixel;
                    }
                }
                if (bgWorker.CancellationPending)
                {
                    e.Cancel = true;
                    e.Result = null;
                    output = null;
                    pixels = null;
                    return;
                }
                //一行报告进度一次

                //调用 ReportProgress 方法时将引发ProgressChanged 事件。
                bgWorker.ReportProgress((i + 1) * 100 / height);
            }
            stops.Clear();
            output = null;

            e.Result = new object[] { pixels, width, height, onCompleted };
        }