ClipperLib 用矩形剪辑多个正方形产生 1 个结果

I'm using v6.4.2 of the C# version of the ClipperLib. I have a lot of squares making up a fishnet. I also have a rectangle. I want to get a result where only the squares that are inside the rectangle are returned and partially overlapped get clipped. The subjects are in green and the clip is in red:

The result I get is the brown/gray rectangle, which is only one polygon:

我原本期望得到 15 个完整的正方形和 13 个剪裁的正方形。

这是我正在使用的代码：

var startX = 100;
var startY = 250;
const int numPolygons = 10;

var subj = new Polygons(numPolygons * numPolygons);
for (var i = 0; i < numPolygons; i++)
{
    for (var j = 0; j < numPolygons; j++)
    {
        var square = new Polygon(4)
        {
            new IntPoint(startX, startY),
            new IntPoint(startX + 10, startY),
            new IntPoint(startX + 10, startY - 10),
            new IntPoint(startX, startY - 10)
        };
        subj.Add(square);
        // Moving to the right
        startX = startX + 10;
    }
    // Moving down
    startY = startY - 10;
    startX = 100;
}

var clip = new Polygons(1);
clip.Add(new Polygon(4));
clip[0].Add(new IntPoint(165, 215));
clip[0].Add(new IntPoint(255, 215));
clip[0].Add(new IntPoint(255, 155));
clip[0].Add(new IntPoint(165, 155));

var solution = new Polygons();
var c = new Clipper.Clipper();
c.AddPaths(subj, PolyType.ptSubject, true);
c.AddPaths(clip, PolyType.ptClip, true);
c.Execute(ClipType.ctIntersection, solution, PolyFillType.pftEvenOdd, PolyFillType.pftEvenOdd);
Debug.WriteLine("solution.Count: " + solution.Count);

运行上面的代码大约需要0.5秒。因为结果看起来剪辑和主题被切换了，所以我已经切换了它们。结果是一样的，但现在只需要0.1秒。所以做了一些额外的事情。我认为这是所得正方形的合并。

我不希望结果合并。我怎样才能防止这种情况发生？或者我的代码有问题？

据快船报道文档 http://www.angusj.com/delphi/clipper/documentation/Docs/Units/ClipperLib/Classes/Clipper/Methods/Execute.htm of the Execute method:

关于返回的解决方案路径，有几点需要注意：

... 多边形可能很少共享公共边（尽管从版本 6 开始这种情况非常罕见）

我认为这意味着在执行任何剪切操作时路径会被合并。

我尝试用不同的 PolyFillType 做同样的事情，但也没有成功。

您可能想尝试运行Execute方法在每个方块上单独（主题）针对每次迭代的剪切区域，这应该可以完成工作，尽管性能可能会因此受到影响。