public Vector2f Lerp(Vector2f target, float alpha)
{
Vector2f r = this.Mul(1.0f - alpha);
r.Add(target.Tmp().Mul(alpha));
return(r);
}
public static Vector2f GetVelocity(Vector2f velocity, Vector2f force,
float mass) {
Vector2f acceleration = new Vector2f(force.GetX() / mass, force.GetY()
/ mass);
velocity.Add(acceleration);
return velocity;
}
public bool Intersects(Line other)
{
Vector2f lineSegmentStart = new Vector2f(other.GetX1(), other.GetY1());
Vector2f lineSegmentEnd = new Vector2f(other.GetX2(), other.GetY2());
Vector2f circleCenter = new Vector2f(GetCenterX(), GetCenterY());
Vector2f closest;
Vector2f segv = lineSegmentEnd.Sub(lineSegmentStart);
Vector2f ptv = circleCenter.Sub(lineSegmentStart);
float segvLength = segv.Len();
float projvl = ptv.Dot(segv) / segvLength;
if (projvl < 0)
{
closest = lineSegmentStart;
}
else if (projvl > segvLength)
{
closest = lineSegmentEnd;
}
else
{
Vector2f projv = segv.Mul(projvl / segvLength);
closest = lineSegmentStart.Add(projv);
}
bool intersects = circleCenter.Sub(closest).LengthSquared() <= GetRadius()
* GetRadius();
return(intersects);
}
public static Vector2f GetVelocity(Vector2f velocity, List<Vector2f> forces)
{
foreach (Vector2f v in forces)
{
velocity.Add(v);
}
return velocity;
}
public static Vector2f Sum(IList <Vector2f> summands)
{
Vector2f result = new Vector2f(0, 0);
for (IEnumerator <Vector2f> it = summands.GetEnumerator(); it.MoveNext();)
{
Vector2f v = it.Current;
result.Add(v);
}
return(result);
}
public bool Intersects(Line other) {
Vector2f lineSegmentStart = new Vector2f(other.GetX1(), other.GetY1());
Vector2f lineSegmentEnd = new Vector2f(other.GetX2(), other.GetY2());
Vector2f circleCenter = new Vector2f(GetCenterX(), GetCenterY());
Vector2f closest;
Vector2f segv = lineSegmentEnd.Sub(lineSegmentStart);
Vector2f ptv = circleCenter.Sub(lineSegmentStart);
float segvLength = segv.Len();
float projvl = ptv.Dot(segv) / segvLength;
if (projvl < 0) {
closest = lineSegmentStart;
} else if (projvl > segvLength) {
closest = lineSegmentEnd;
} else {
Vector2f projv = segv.Mul(projvl / segvLength);
closest = lineSegmentStart.Add(projv);
}
bool intersects = circleCenter.Sub(closest).LengthSquared() <= GetRadius()
* GetRadius();
return intersects;
}
public static Vector2f Sum(Vector2f a, Vector2f b)
{
Vector2f answer = new Vector2f(a);
return(answer.Add(b));
}
public static Vector2f Sum(Vector2f a, Vector2f b) {
Vector2f answer = new Vector2f(a);
return answer.Add(b);
}
public static Vector2f Sum(IList<Vector2f> summands)
{
Vector2f result = new Vector2f(0, 0);
for (IEnumerator<Vector2f> it = summands.GetEnumerator(); it.MoveNext(); )
{
Vector2f v = it.Current;
result.Add(v);
}
return result;
}
public static Vector2f GetVelocity(Vector2f velocity, Vector2f force)
{
velocity.Add(force);
return velocity;
}
