/// <summary>
/// Check if target unit is in range. If so, apply force and damage
/// </summary>
/// <param name="effectPos">origin of effect</param>
/// <param name="target">target unit</param>
public void TryApply(Vector2 effectPos, PhysicalBody target, TimeSpan time)
{
if (utility.XnaHelper.RectangleIntersectsCircle(target.HitRect, effectPos, _radius))
{
tempVec.X = target.Position.X - effectPos.X;
tempVec.Y = target.Position.Y - effectPos.Y;
Vector2.Normalize(tempVec);
float factor = Duration == TimeSpan.Zero ? 1 : (float)time.TotalSeconds / (float)Duration.TotalSeconds;
target.ApplyForce(_force * factor * tempVec);
target.ApplyDamage((_damage * factor));
target.ApplyStatus(_statEffects);
}
}
public virtual void CheckAndApplyUnitCollision(PhysicalBody other)
{
if (!Collides)
return; //don't check collision if unit shouldn't collide
//special shattered collision detection
if (_lifeState == LifeState.Shattered)
{
tempRec.Width = _hitRect.Width / c_shatterDivisions;
tempRec.Height = _hitRect.Height / c_shatterDivisions;
for (int i = 0; i < c_shatterDivisions ; i++)
for (int j = 0; j < c_shatterDivisions; j++)
{
tempRec.X = (int)(_fragments[i,j].Position.X - tempRec.Width / 2);
tempRec.Y = (int)(_fragments[i,j].Position.Y - tempRec.Height / 2);
if (tempRec.Intersects(other.HitRect))
{
Vector2 fVel = _fragments[i, j].Velocity;
float fMass = (float)Mass / (c_shatterDivisions * c_shatterDivisions);
temp = other.Velocity;
other._velocity = (other._velocity * (other.Mass - fMass) + 2 * fMass * fVel) /
(fMass + other.Mass);
_fragments[i,j].Velocity = (fVel * (fMass - other.Mass) + 2 * other.Mass * temp) /
(fMass + other.Mass);
}
}
return; //ignore normal collision detection
}
//check if fire should be transferred
float dist = XnaHelper.DistanceBetweenRects(HitRect, other.HitRect);
if (dist < FIRE_SPREAD_DISTANCE)
{
if (_statusEffects.Fire > other._statusEffects.Fire)
{
StatEffect transfer = new StatEffect() { Fire = FIRE_SPREAD_FACTOR * dist / FIRE_SPREAD_DISTANCE * _statusEffects.Fire };
other.ApplyStatus(transfer);
ApplyStatus(transfer * -FIRE_SPREAD_LOSS);
}
}
if (XnaHelper.RectsCollide(HitRect, other.HitRect))
{
temp = other._velocity; //temp is a static reusable vector
other._velocity = (other._velocity * (other.Mass - this.Mass) + 2 * this.Mass * this._velocity) /
(this.Mass + other.Mass);
this._velocity = (this._velocity * (this.Mass - other.Mass) + 2 * other.Mass * temp) /
(this.Mass + other.Mass);
}
}