public void testRayCast()
{
// Static RayCast tests
Assert.AreEqual(double.PositiveInfinity, testRect.rayCast(new Ray2D(1.0d, 1.0d, -7.0d, -8.0d)), 0.000005d);
Assert.AreEqual(System.Math.Sqrt(2), testRect.rayCast(new Ray2D(2.0d, 3.0d, 3.0d, 4.0d)), 0.000005d);
// Serial RayCast tests
Rect2D randomRect;
Line2D currentSide;
Point2D randomPointOnSide;
Point2D randomPoint;
int i = 100;
do
{
randomRect = new Rect2D(Util.generateRandomDoubleBetween(-1000.0d, 1000.0d), Util.generateRandomDoubleBetween(-1000.0d, 1000.0d), Util.generateRandomDoubleBetween(-1000.0d, 1000.0d), Util.generateRandomDoubleBetween(-1000.0d, 1000.0d));
int j = 50;
do
{
currentSide = new Line2D(randomRect.getUpperLeft(), randomRect.getUpperRight());
randomPointOnSide = currentSide.randomPoint();
randomPoint = new Point2D(Util.generateRandomDoubleBetween(-1000.0d, 1000.0d), Util.generateRandomDoubleBetween(randomPointOnSide.getY(), 1000.0d));
Assert.AreEqual(randomPoint.distance(randomPointOnSide), randomRect.rayCast(new Ray2D(randomPoint, randomPoint.vec(randomPointOnSide))), 0.000005d);
currentSide = new Line2D(randomRect.getLowerLeft(), randomRect.getLowerRight());
randomPointOnSide = currentSide.randomPoint();
randomPoint = new Point2D(Util.generateRandomDoubleBetween(-1000.0d, 1000.0d), Util.generateRandomDoubleBetween(-1000.0d, randomPointOnSide.getY()));
Assert.AreEqual(randomPoint.distance(randomPointOnSide), randomRect.rayCast(new Ray2D(randomPoint, randomPoint.vec(randomPointOnSide))), 0.000005d);
currentSide = new Line2D(randomRect.getLowerLeft(), randomRect.getUpperLeft());
randomPointOnSide = currentSide.randomPoint();
randomPoint = new Point2D(Util.generateRandomDoubleBetween(-1000.0d, randomPointOnSide.getX()), Util.generateRandomDoubleBetween(-1000.0d, 1000.0d));
Assert.AreEqual(randomPoint.distance(randomPointOnSide), randomRect.rayCast(new Ray2D(randomPoint, randomPoint.vec(randomPointOnSide))), 0.000005d);
currentSide = new Line2D(randomRect.getLowerRight(), randomRect.getUpperRight());
randomPointOnSide = currentSide.randomPoint();
randomPoint = new Point2D(Util.generateRandomDoubleBetween(randomPointOnSide.getX(), 1000.0d), Util.generateRandomDoubleBetween(-1000.0d, 1000.0d));
Assert.AreEqual(randomPoint.distance(randomPointOnSide), randomRect.rayCast(new Ray2D(randomPoint, randomPoint.vec(randomPointOnSide))), 0.000005d);
j -= 1;
} while (j > 0);
i -= 1;
} while (i > 0);
}
/**
* Calculates the length of a ray until it intersects with a shape.<br/>
* As this class uses the set maximum ray range to speed up this ray casting,<br/>
* this function may return {@code double.PositiveInfinity} for a ray that intersects with an obstacle that is further away than the rayRange from the given starting point.
* @param ray the ray to be used for ray casting.
* @return the length of the ray.
*/
public double rayCast(Ray2D ray)
{
double result = double.PositiveInfinity;
Rect2D rayBounding = new Rect2D(ray.getStart().getX() - rayRange, ray.getStart().getY() - rayRange, ray.getStart().getX() + rayRange, ray.getStart().getY() + rayRange);
for (int i = 0; i < shapes.Size(); ++i)
{
Rect2D bounding = boundaries.Get(i);
if (rayBounding.isInsideBorder(bounding.getLowerLeft()) ||
rayBounding.isInsideBorder(bounding.getUpperLeft()) ||
rayBounding.isInsideBorder(bounding.getLowerRight()) ||
rayBounding.isInsideBorder(bounding.getUpperRight()))
{
double tmp = shapes.Get(i).rayCast(ray);
result = tmp < result ? tmp : result;
}
}
return(result);
}
