private static int checkBox(Rectangle specRectA, Rectangle specRectB, bool isX)
{
bool collided = SatCollider.CollideBoxes(specRectA, specRectB);
return(collided
? (isX ? SatCollider.GetMinTranslationX(specRectA, specRectB) : SatCollider.GetMinTranslationY(specRectA, specRectB))
: 0);
}
public void Collide(List <ColliderComponent> allBoxes)
{
if (!Enabled)
{
return;
}
for (int i = 0; i < allBoxes.Count; i++)
{
var boxA = allBoxes[i];
if (!boxA.Enabled || boxA.IsPassive())
{
continue;
}
var rectA = boxA.GetRectangle();
for (int j = 0; j < allBoxes.Count; j++)
{
var boxB = allBoxes[j];
if (i == j || !boxB.Enabled || boxA.FrameCollisions.Contains(boxB) || (boxA.IgnoredColliders?.Contains(boxB) == true))
{
continue;
}
bool collided;
if (boxA.GetShape() == HitboxShapes.Box && boxB.GetShape() == HitboxShapes.Box)
{
var rectB = boxB.GetRectangle();
int iterationCount = 1;
if (boxA.Object.Velocity.LengthSquared() + boxB.Object.Velocity.LengthSquared() > 3000)
{
iterationCount = 2;
}
var boxAWorldPosition = boxA.Object.WorldPosition;
var boxBWorldPosition = boxB.Object.WorldPosition;
for (int iteration = 0; iteration < iterationCount; iteration++)
{
var deltaTime = (iteration + 1) * time.Time.SecScaled / iterationCount;
var boxASpeculativePosition = boxA.Object.SpeculativeWorldPositionAt(deltaTime);
var boxBSpeculativePosition = boxB.Object.SpeculativeWorldPositionAt(deltaTime);
var specRectXA = getSpeculativeRect(rectA, boxASpeculativePosition.X, boxAWorldPosition.Y);
var specRectXB = getSpeculativeRect(rectB, boxBSpeculativePosition.X, boxBWorldPosition.Y);
var penX = checkBox(specRectXA, specRectXB, true);
if (penX != 0)
{
penX = (penX < 0 && (boxA.IgnoredSides[1] || boxB.IgnoredSides[3])) ||
(penX > 0 && (boxA.IgnoredSides[3] || boxB.IgnoredSides[1]))
? 0 : penX;
}
var specRectYA = getSpeculativeRect(rectA, boxAWorldPosition.X, boxASpeculativePosition.Y);
var specRectYB = getSpeculativeRect(rectB, boxBWorldPosition.X, boxBSpeculativePosition.Y);
var penY = checkBox(specRectYA, specRectYB, false);
if (penY != 0)
{
penY = (penY < 0 && (boxA.IgnoredSides[2] || boxB.IgnoredSides[0])) ||
(penY > 0 && (boxA.IgnoredSides[0] || boxB.IgnoredSides[2]))
? 0 : penY;
}
if (penX != 0 || penY != 0)
{
var penetration = new Point(penX, penY);
boxA.Collided(boxB, penetration);
boxB.Collided(boxA, penetration.Mult(-1));
break;
}
}
}
else if (boxA.GetShape() == HitboxShapes.Box && boxB.GetShape() == HitboxShapes.Point)
{
collided = SatCollider.CollideBoxPoint(boxA.GetRectangle(), boxB.Object.WorldPosition);
if (collided)
{
boxA.Collided(boxB, Point.Zero);
boxB.Collided(boxA, Point.Zero);
}
}
else if (boxA.GetShape() == HitboxShapes.Point && boxB.GetShape() == HitboxShapes.Box)
{
collided = SatCollider.CollideBoxPoint(boxB.GetWorldRectangle(), boxA.Object.WorldPosition);
if (collided)
{
boxA.Collided(boxB, Point.Zero);
boxB.Collided(boxA, Point.Zero);
}
}
else
{
throw new NotImplementedException(string.Format("no collision detection algorithm for shapes {0} and {1}", boxA.GetShape(), boxB.GetShape()));
}
}
}
}