public ICollider CreateCircleCollider(Vector2D position, float radius)
{
CircleCollider collider = new CircleCollider();
collider.Position = position;
collider.Radius = radius;
_world.Add(collider);
return(collider);
}
private bool HitCircle(CircleCollider other)
{
Vector2D diff = Position - other.Position;
float x0 = Position.X + Center.X;
float y0 = Position.Y + Center.Y;
float x1 = other.Position.X + other.Center.X;
float y1 = other.Position.Y + other.Center.Y;
float doubleRadius = Square(Radius + other.Radius);
float doubleDistance = Square(x0 - x1) + Square(y0 - y1);
_circleDistance = doubleDistance;
return(doubleDistance <= doubleRadius);
}
private bool HitCircle(CircleCollider other)
{
bool bRetVal = false;
switch (Type)
{
case Collider2DType.PlaneX:
bRetVal = other.Position.X <_tupal || other.Position.X + other.Radius> _tupal;
break;
case Collider2DType.PlaneY:
bRetVal = other.Position.Y + (other.Radius * 2) > _tupal;
break;
}
return(bRetVal);
}
private void CalcCircleHits(CircleCollider other)
{
// Set small value for validating collider values
float EPS = 0.0000001f;
float r, R, d, dx, dy, cx, cy, Cx, Cy;
if (Radius < other.Radius)
{
r = Radius;
R = other.Radius;
cx = Position.X;
cy = Position.Y;
Cx = other.Position.X;
Cy = other.Position.Y;
}
else
{
R = Radius;
r = other.Radius;
Cx = Position.X;
Cy = Position.Y;
cx = other.Position.X;
cy = other.Position.Y;
}
dx = cx - Cx;
dy = cy - Cy;
d = (float)System.Math.Sqrt(Square(dx) + Square(dy));
// Check for no intersections and circles are outside
if (d < EPS && System.Math.Abs(R - r) < EPS)
{
return;
}
else if (d < EPS)
{
return;
}
Vector2D p = new Vector2D {
X = (dx / d) * R + Cx, Y = (dy / d) * R + Cy
};
// Check if colliders are touching on one point
if (System.Math.Abs((R + r) - d) < EPS || System.Math.Abs(R - (r + d)) < EPS)
{
_hitPoint.Add(p);
return;
}
// Check if collider is within collider
if ((d + r) < R || R + r < d)
{
return;
}
Vector2D C = new Vector2D {
X = Cx, Y = Cy
};
float angle = (float)SafeACOS(Square(r) - Square(d) - Square(R) / (-2.0 * d * R));
_hitPoint.Add(C.RotateVector(p, +angle));
_hitPoint.Add(C.RotateVector(p, -angle));
}
