/// <summary>
/// Adapted from OLC Tutorial
/// </summary>
/// <param name="body"></param>
/// <param name="target"></param>
/// <param name="contactPoint"></param>
/// <param name="contactNormal"></param>
/// <param name="contactTime"></param>
/// <param name="dt"></param>
/// <returns></returns>
public static bool DynamicRectVsRect(SimplePhysicsBody body, RectangleF target, out Vector2 contactPoint,
out Vector2 contactNormal, out float contactTime, float dt)
{
contactPoint = Vector2.Zero;
contactNormal = Vector2.Zero;
contactTime = 0f;
if (body.Velocity == Vector2.Zero)
{
return(false);
}
var bodyRect = body.ColliderRect;
var expandedTarget = new RectangleF(target.Position - bodyRect.Size / 2, target.Size + bodyRect.Size);
if (RayVsRect(bodyRect.Center, body.Velocity * dt, expandedTarget, out contactPoint,
out contactNormal, out contactTime))
{
if (contactTime < 1f && contactTime >= 0f)
{
return(true);
}
}
return(false);
}
/// <summary>
/// Assuming this is a dynamic body, resolve a collision against this other body
/// </summary>
/// <param name="other"></param>
public void CollideWith(SimplePhysicsBody other, float dt)
{
var otherCollider = other.ColliderRect;
if (DynamicRectVsRect(this, otherCollider, out var contactPoint, out var contactNormal,
out var contactTime, dt))
{
this.collisionsThisFrame.Add(new CollideMoment(contactTime, otherCollider, contactNormal));
}
}
