poly - line intersect and tests

2013-11-24 21:01:09 -08:00
parent 5b6dac04e0
commit 6170691eb1
3 changed files with 79 additions and 3 deletions
@@ -61,9 +61,21 @@ func ProjectPolygon(axis Vector2d, p Polygon2d) (min float32, max float32) {
 	return min, max
 }

-func PolygonIntersection(r Polygon2d, p Point2d, v Vector2d) (bool, bool, Point2d) {
-	// TBD
-	return false, false, Point2d{}
+func PolygonIntersection(r Polygon2d, p Point2d, v Vector2d) (bool, Point2d) {
+
+	for point, _ := range r.Points {
+		if point == len(r.Points) {
+			break
+		}
+
+		edgePt, edgeVec := r.Edge(point)
+		intersection, pt := Intersection(p, edgePt, v, edgeVec)
+		if intersection {
+			return intersection, pt
+		}
+	}
+
+	return false, Point2d{}
 }

 func PolyPolyIntersection(p1 Polygon2d, v1 Vector2d, p2 Polygon2d, v2 Vector2d) bool {