从画布获取多边形的点

Question

在C＃中为Pixelsense实现WPF应用程序 。

为了检测多边形重叠（这是下一阶段），我很难找到在屏幕上放置了多边形的特定点。 总共，我的应用程序中可以有7个多边形，下面是我尝试获得其点的代码。

我认为代码理想地要做的是开始一个循环，创建一个多边形（形状1），然后开始第二个循环，创建另一个多边形（形状2），并获得两个形状点并检查是否重叠。 然后，第二个循环将继续通过获取点的形状来检查另一个形状（形状3）是否与形状1重叠，依此类推...因此，将对其他6个多边形检查第一个多边形是否存在重叠，从而进行嵌套循环。

但是， 当前发生的事情是方法为第一个多边形选择的所有点，它们也为第二个多边形复制。 因此，它为两个单独的多边形打印出一组重复点，并永远循环。

我已经坚持了一段时间，请帮助我:)

public void DefiningPolygonArea()
    {
        foreach (var polygonsCollection1 in this.PlayingCanvas.Children)
        {
            Polygon polygon1 = polygonsCollection1 as Polygon;
            if (polygon1 != null)
            {
                foreach (var polygonsCollection2 in this.PlayingCanvas.Children)
                {
                    Polygon polygon2 = polygonsCollection2 as Polygon;
                    if (polygon1 != polygon2 && polygon2 != null)
                    {
                        HelperMethods.PointCollectionsOverlap_Fast(getPoints(polygon1), getPoints(polygon2));
                    }
                }
            }
        }
    }

private List<Point> getPoints(Polygon poly)
    {
        if (poly.Points.Count == 4)
        {
            var transform = poly.TransformToVisual(this.PlayingCanvas);

            Point point1 = transform.Transform(poly.Points[0]);
            Point point2 = transform.Transform(poly.Points[1]);
            Point point3 = transform.Transform(poly.Points[2]);
            Point point4 = transform.Transform(poly.Points[3]);

            area1.Add(point1);
            area1.Add(point2);
            area1.Add(point3);
            area1.Add(point4);
            Console.WriteLine("polygon with 4 points consists of: " + area1[0] + " , " + area1[1] + " , " + area1[2] + " , " + area1[3]);

        }
        else if (poly.Points.Count == 3)
        {
            var transform = poly.TransformToVisual(this.PlayingCanvas);

            Point point1 = transform.Transform(poly.Points[0]);
            Point point2 = transform.Transform(poly.Points[1]);
            Point point3 = transform.Transform(poly.Points[2]);

            area1.Add(point1);
            area1.Add(point2);
            area1.Add(point3);
            Console.WriteLine("polygon with 3 points consists of: " + area1[0] + " , " + area1[1] + " , " + area1[2]);
        }

        return area1;
    }

输出：

具有4个点的多边形包括：713.345368087522,713.83644226973，550.136522242161,724.044829935686，463.067512500796,641.78273862321，626.276358346157,631.574350957254

3点的多边形包含：713.345368087522,713.83644226973，550.136522242161,724.044829935686，463.067512500796,641.78273862321

Answer 1

根据我的评论，您的循环需要像这样进行排除：

foreach (var polygon1 in this.PlayingCanvas.Children.OfType<Polygon>())
    foreach (var polygon2 in this.PlayingCanvas.Children.OfType<Polygon>().Where(x => x != polygon1))
            HelperMethods.PointCollectionsOverlap_Fast(getPoints(polygon1), getPoints(polygon2));

用StackEdit编写 。