private boolean collidesHelper(Triangle triangle, Circle circle) {
// if either shape is entirely inside the other, then they must be colliding
// since both shapes are convex, this test will catch at least those cases
if (triangle.positionIsInShape(circle.position().getPosition())) {
return true;
}
if (circle.positionIsInShape(triangle.position().getPosition())) {
return true;
}
// Now that we know that neither one is entirely inside the other,
// the only way the shapes can possibly be colliding is if one of the
// edges of the triangle is colliding with the circle
ShapeCollisionStrategy tester =
ShapeCollisionStrategy.getStrategyForShapes(LineSegment.class, Circle.class);
for (LineSegment currentEdge : triangle.getEdges()) {
if (tester.collides(currentEdge, circle)) {
return true;
}
}
// So neither shape is entirely in the other, and none of the triangle's
// edges are intersecting with the circle. The two
// Shapes are not colliding.
return false;
}
static {
ShapeCollisionStrategy.addStrategy(new TriangleCircleStrategy(), Triangle.class, Circle.class);
}
