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public RayCast ( |
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| output | The ray-cast results. | |
| input | The ray-cast input parameters. | |
| childIndex | int | Index of the child. |
| 리턴 | bool | |
/// <summary>
/// Ray-cast the world for all fixtures in the path of the ray. Your callback
/// controls whether you get the closest point, any point, or n-points.
/// The ray-cast ignores shapes that contain the starting point.
///
/// Inside the callback:
/// return -1: ignore this fixture and continue
/// return 0: terminate the ray cast
/// return fraction: clip the ray to this point
/// return 1: don't clip the ray and continue
/// </summary>
/// <param name="callback">A user implemented callback class.</param>
/// <param name="point1">The ray starting point.</param>
/// <param name="point2">The ray ending point.</param>
public void RayCast(RayCastCallback callback, Vector2 point1, Vector2 point2)
{
RayCastInput input = new RayCastInput();
input.MaxFraction = 1.0f;
input.Point1 = point1;
input.Point2 = point2;
this.ContactManager.BroadPhase.RayCast((rayCastInput, proxyId) =>
{
FixtureProxy proxy = this.ContactManager.BroadPhase.GetProxy(proxyId);
Fixture fixture = proxy.Fixture;
int index = proxy.ChildIndex;
RayCastOutput output;
bool hit = fixture.RayCast(out output, ref rayCastInput, index);
if (hit)
{
float fraction = output.Fraction;
Vector2 point = (1.0f - fraction) * rayCastInput.Point1 + fraction * rayCastInput.Point2;
return(callback(fixture, point, output.Normal, fraction));
}
return(rayCastInput.MaxFraction); //input.MaxFraction;
}, ref input);
}
private float RayCastCallbackWrapper(ref RayCastInput input, int proxyId)
{
FixtureProxy proxy = ContactManager.BroadPhase.GetUserData <FixtureProxy>(proxyId);
Fixture fixture = proxy.Fixture;
int index = proxy.ChildIndex;
RayCastOutput output;
bool hit = fixture.RayCast(out output, ref input, index);
if (hit)
{
float fraction = output.Fraction;
Vector2 point = (1.0f - fraction) * input.Point1 + fraction * input.Point2;
return(_rayCastCallback(fixture, point, output.Normal, fraction));
}
return(input.MaxFraction);
}
