private Vector2f[] IntersectionPoints(FloatLine ray, RectangleShape shape)
{
var l1 = new FloatLine(shape.Position, shape.Position + new Vector2f(shape.Size.X, 0));
var l2 = new FloatLine(shape.Position, shape.Position + new Vector2f(0, shape.Size.Y));
var l3 = new FloatLine(
shape.Position.X,
shape.Position.Y + shape.Size.Y,
shape.Position.X + shape.Size.X,
shape.Position.Y + shape.Size.Y
);
var l4 = new FloatLine(
shape.Position.X + shape.Size.X,
shape.Position.Y,
shape.Position.X + shape.Size.X,
shape.Position.Y + shape.Size.Y
);
var intersections = new List <Vector2f?>
{
ray.Intersects(l1),
ray.Intersects(l2),
ray.Intersects(l3),
ray.Intersects(l4),
};
return(intersections
.Where(x => x != null)
.Cast <Vector2f>()
.ToArray());
}
private Vector2f[] IntersectionPoints(FloatLine ray, LineShape shape)
{
var line = new FloatLine(shape.P1, shape.P2);
var intersectionPoint = ray.Intersects(line);
return(intersectionPoint.HasValue ? new[] { intersectionPoint.Value } : new Vector2f[0]);
}
private Vector2f[] IntersectionPoints(FloatLine ray, CircleShape shape)
{
var circle = new FloatCircle(shape.Position, shape.Radius);
var circleDelta = (shape.Position - Position);
var product = Direction.Dot(circleDelta);
if (product <= 0) // if ray is facing in the opposite direction of the circle
{
return(Array.Empty <Vector2f>());
}
return(ray.Intersects(circle));
}