Esempio n. 1
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 public static SKPoint?FindIntersection(SKLine a, SKPoint c0, SKPoint c1, SKPoint c2, SKPoint c3, bool segment)
 {
     return(FindIntersection(a, new SKLine(c0, c1), segment) ??
            FindIntersection(a, new SKLine(c1, c2), segment) ??
            FindIntersection(a, new SKLine(c2, c3), segment) ??
            FindIntersection(a, new SKLine(c3, c0), segment));
 }
Esempio n. 2
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 public bool IntersectsWith(Quad value)
 {
     return(SKLine.FindIntersection(new SKLine(pointTopLeft, pointTopRight), value, true) != null ||
            SKLine.FindIntersection(new SKLine(pointTopRight, pointBottomRight), value, true) != null ||
            SKLine.FindIntersection(new SKLine(pointBottomRight, pointBottomLeft), value, true) != null ||
            SKLine.FindIntersection(new SKLine(pointBottomLeft, pointTopLeft), value, true) != null);
 }
Esempio n. 3
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        public static SKPoint?FindIntersection(SKLine a, SKLine b, bool segment)
        {
            float x1 = a.a.X;
            float y1 = a.a.Y;
            float x2 = a.b.X;
            float y2 = a.b.Y;

            float x3 = b.a.X;
            float y3 = b.a.Y;
            float x4 = b.b.X;
            float y4 = b.b.Y;

            float denominator = (x1 - x2) * (y3 - y4) - (y1 - y2) * (x3 - x4);

            if (denominator == 0)
            {
                return(null);
            }
            if (segment)
            {
                float t = ((x1 - x3) * (y3 - y4) - (y1 - y3) * (x3 - x4)) / denominator;
                if (t < 0 || t > 1)
                {
                    return(null);
                }
                float u = -((x1 - x2) * (y1 - y3) - (y1 - y2) * (x1 - x3)) / denominator;
                if (u < 0 || u > 1)
                {
                    return(null);
                }
            }
            float xNominator = (x1 * y2 - y1 * x2) * (x3 - x4) - (x1 - x2) * (x3 * y4 - y3 * x4);
            float yNominator = (x1 * y2 - y1 * x2) * (y3 - y4) - (y1 - y2) * (x3 * y4 - y3 * x4);

            float px = xNominator / denominator;
            float py = yNominator / denominator;

            return(new SKPoint(px, py));
        }
Esempio n. 4
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 public static SKPoint?FindIntersection(SKLine a, Quad q, bool segment)
 {
     return(FindIntersection(a, q.TopLeft, q.TopRight, q.BottomRight, q.BottomLeft, segment));
 }