protected bool CheckForCollisions(TFirst Object, TSecond collidable, bool collidedAlready)
{
var originalInfo = new CollisionInfo {
OriginalPosition = Object.Position.Copy(), OriginalVelocity = Object.Motion.CurrentMotionPerSecond
};
if (Object.IsRemoved || collidable.IsRemoved)
{
return(false);
}
//get position after motion is adjusted but before collision is corrected
var testPosition = Object.Motion.FrameStartPosition.Copy().Translate(Object.Motion.FrameVelocity);
if (collidable.DetectCollision(testPosition, false))
{
foreach (var responder in Responders)
{
responder.RespondToCollision(Object, collidable, originalInfo);
}
if (!collidedAlready)
{
foreach (var responder in OneTimeResponders)
{
responder.RespondToCollision(Object, collidable, originalInfo);
}
}
return(true);
}
else
{
return(false);
}
}
protected virtual void BeforePositionCorrected(TFirst moveableObject, TSecond collidable, CollisionInfo collisionInfo, Rectangle tryPosition)
{
if (tryPosition.Center.X != moveableObject.Position.Center.X)
{
moveableObject.Motion.Stop(Axis.X);
}
if (tryPosition.Center.Y < moveableObject.Position.Center.Y && moveableObject.Motion.CurrentMotionPerSecond.Y > 0)
{
moveableObject.Motion.Stop(Axis.Y);
}
if (tryPosition.Center.Y > moveableObject.Position.Center.Y && moveableObject.Motion.CurrentMotionPerSecond.Y < 0)
{
moveableObject.Motion.Stop(Axis.Y);
}
}
void ICollisionResponder <TFirst, TSecond> .RespondToCollision(TFirst obj, TSecond collidable, CollisionInfo collisionInfo)
{
Action(obj, collidable, collisionInfo);
}
void ICollisionResponder <TFirst, TSecond> .RespondToCollision(TFirst moveableObject, TSecond collidable, CollisionInfo collisionInfo)
{
var movingCollidable = collidable as IMovingCollidable;
var tryPosition = new Rectangle();
tryPosition.Set(moveableObject.Position);
bool collideX, collideY;
tryPosition.Set(moveableObject.Position);
tryPosition.SetLeft(moveableObject.Motion.FrameStartPosition.Left);
if (movingCollidable != null)
{
collideX = !movingCollidable.DetectFrameStartCollision(tryPosition);
}
else
{
collideX = !collidable.DetectCollision(tryPosition, true);
}
tryPosition.Set(moveableObject.Position);
tryPosition.SetTop(moveableObject.Motion.FrameStartPosition.Top);
if (movingCollidable != null)
{
collideY = !movingCollidable.DetectFrameStartCollision(tryPosition);
}
else
{
collideY = !collidable.DetectCollision(tryPosition, true);
}
tryPosition.Set(moveableObject.Position);
if (collideY && !collideX)
{
TryCorrectPosition(tryPosition, moveableObject, collidable, movingCollidable, correctX: false, correctY: true);
}
if (collideX && !collideY)
{
TryCorrectPosition(tryPosition, moveableObject, collidable, movingCollidable, correctX: true, correctY: false);
}
if (collidable.DetectCollision(tryPosition, false))
{
TryCorrectPosition(tryPosition, moveableObject, collidable, movingCollidable, correctX: false, correctY: true);
if (collidable.DetectCollision(tryPosition, false))
{
TryCorrectPosition(tryPosition, moveableObject, collidable, movingCollidable, true, true);
}
}
if (collidable.DetectCollision(tryPosition, false))
{
TryCorrectPosition(tryPosition, moveableObject, collidable, movingCollidable, true, true, true);
}
BeforePositionCorrected(moveableObject, collidable, collisionInfo, tryPosition);
if (tryPosition.Center.Y < moveableObject.Position.Center.Y - 18)
{
GlobalDebugHelper.NoOp();
}
moveableObject.Position.Set(tryPosition);
}
