用于图像像素分析(x，y) C#的螺旋环路

Question

我正在尝试在坐标(x，y)中进行像素搜索

我需要一个函数( int width，int height)，它返回一个从中心开始的点数组。

如果镜像有1000x1000，我需要获取{500,500}，{501,500}，{501,501}，{500,501}，{499,501}，{499,500} ...

示例：

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Answer 1

嗯，这比我想象的要容易。

static IEnumerable<Point> GetPixels(int size)
{
    Point point = new Point(size/2, size/2);

    yield return point;
    int sign = 1;
    for (int row = 1; row < size; row++)
    {
        // move right/left by row, and then up/down by row
        for (int k = 0; k < row; k++)
        {
            point.Offset(sign*1, 0);
            yield return point;
        }
        for (int k = 0; k < row; k++)
        {
            point.Offset(0, -sign*1);
            yield return point;
        }
        sign *= -1;
    }
    // last leg to finish filling the area
    for (int k = 0; k < size-1; k++)
    {
        point.Offset(sign*1, 0);
        yield return point;
    }

}

结果(size=5)

{X=2,Y=2}
{X=3,Y=2}
{X=3,Y=1}
{X=2,Y=1}
{X=1,Y=1}
{X=1,Y=2}
{X=1,Y=3}
{X=2,Y=3}
{X=3,Y=3}
{X=4,Y=3}
{X=4,Y=2}
{X=4,Y=1}
{X=4,Y=0}
{X=3,Y=0}
{X=2,Y=0}
{X=1,Y=0}
{X=0,Y=0}
{X=0,Y=1}
{X=0,Y=2}
{X=0,Y=3}
{X=0,Y=4}
{X=1,Y=4}
{X=2,Y=4}
{X=3,Y=4}
{X=4,Y=4}

或图形化的size=50

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测试代码非常简单

static void Main(string[] args)
{
    foreach (var point in GetPixels(5))
    {
        Console.WriteLine($"{point}");
    }

    Console.WriteLine();
}