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

        private static void AddPoint(ushort[] distanceMatrix, int radius, int x, int y, int value, int[] output, int width)
        {
            int diameter = radius * 2 - 1;
            for (int i = 0; i < diameter; i++)
            {
                int start = (y - radius + 1 + i) * width + x - radius;
                for (int j = 0; j < diameter; j++)
                {
                    if (j + x - radius < 0 || j + x - radius >= width)
                    {
                        continue;
                    }
                    int idx = start + j;
                    if (idx < 0 || idx >= output.Length)
                    {
                        continue;
                    }
                    output[idx] += distanceMatrix[i * diameter + j] * value;
                }
            }
        }