protected Point Translation(int frames = 1)
{
return((Velocity * frames + Accleration * AdvMath.Factorial(frames)) / Scene.ScaledFPS);
}
//runs after collisions have been detected
private void CollideWith(Collider c, Direction side)
{
Direction oppositeSide = AdvMath.OppositeDirection(side);
GameObject.PreCollision(c, side);
c.GameObject.PreCollision(this, oppositeSide);
if (c == Ignore)
{
return;
}
Rect one = GetBounds();
Rect two = c.GetBounds();
//if one of the colliders is a trigger
if (IsTrigger || c.IsTrigger)
{
if (IsTrigger)
{
GameObject.OnTrigger(c.GameObject, side); //activate collison for this
}
if (c.IsTrigger)
{
c.GameObject.OnTrigger(GameObject, oppositeSide); //activate collison for other object, but opposite side
}
}
else
{ //both are normal
//use momentum and physics to determine what happens when they both collide:
//HOWEVER, if one of them Is Kinematic, or has no PhysicsBody, there is no physics collision
if (c.IsKinematic())
{
FixWith(c, one, two);
GameObject.OnCollision(c.GameObject, side); //activate collison for this
c.GameObject.OnCollision(GameObject, oppositeSide); //activate collison for other object
//ok, done with collisions now
return;
}
//get the average elasticity to use for the collisions
double averageElasticity = (body.Elasticity + c.body.Elasticity) / 2;
//get the system velocity
Point systemVelocity = (body.Momentum + c.body.Momentum) / (body.Mass + c.body.Mass);
//get the new velocities based on that, and the average elasticity
//only do the calculations for the side that the collision is on
if (side == Direction.Down || side == Direction.Up)
{ // Y axis
body.Velocity = new Point(body.Velocity.X, (2 * systemVelocity.Y) - (averageElasticity * body.Velocity.Y));
c.body.Velocity = new Point(c.body.Velocity.X, (2 * systemVelocity.Y) - (averageElasticity * c.body.Velocity.Y));
}
else
{ //X axis
body.Velocity = new Point((2 * systemVelocity.X) - (averageElasticity * body.Velocity.X), body.Velocity.Y);
c.body.Velocity = new Point((2 * systemVelocity.X) - (averageElasticity * c.body.Velocity.X), c.body.Velocity.Y);
}
GameObject.OnCollision(c.GameObject, side); //activate collison for this
c.GameObject.OnCollision(GameObject, oppositeSide); //activate collison for other object
}
}
/// <summary>
/// Finds the angle from one Point to another Point.
/// </summary>
/// <param name="one">The Point that the angle is measured from.</param>
/// <param name="two">The Point that the angle is measured to.</param>
/// <returns>The angle from Point one to Point two, in radians.</returns>
public static double Angle(Point one, Point two)
{
return(Math.Acos(AdvMath.DegreesToRadians(DotProduct(one, two) / (one.Magnitude() * two.Magnitude()))));
}
/// <summary>
/// Rounds the Point to the nearest amount of Digits.
/// </summary>
/// <param name="digits">The degree the number will be rounded to.</param>
/// <returns>A new Point with rounded values.</returns>
public Point Round(int digits = 0)
{
return(new Point(AdvMath.Round(X, digits), AdvMath.Round(Y, digits)));
}
//gets the closest Point on the paremeter to a Point
public Point Closest(Point point)
{
return(new Point(AdvMath.Clamp(point.X, Left, Right), AdvMath.Clamp(point.Y, Bottom, Top)));
}