public static double GetDistance3D(MyVector position1, MyVector position2)
{
return(MyVector.Subtract(position2, position1).GetMagnitude());
}
private void timer1_Tick(object sender, EventArgs e)
{
const double ELAPSEDTIME = .5;
#region Do Physics
_poolBall.PrepareForNewTimerCycle();
if (_isMouseJustReleased)
{
_isMouseJustReleased = false;
MyVector force = new MyVector(_mouseDownPoint);
force.Subtract(new MyVector(_curMousePoint));
MyVector offset = new MyVector(_mouseDownPoint);
offset.Subtract(_poolBall.Position);
_poolBall.ApplyExternalForce(offset, force);
}
_poolBall.TimerTestPosition(ELAPSEDTIME);
_poolBall.TimerFinish();
#endregion
#region Draw
ClearPictureBox();
if (_isMouseDown)
{
DrawVector(_poolBall.Position, new MyVector(_mouseDownPoint.X, _mouseDownPoint.Y, 0), Color.Olive);
DrawVector(new MyVector(_mouseDownPoint.X, _mouseDownPoint.Y, 0), new MyVector(_curMousePoint.X, _curMousePoint.Y, 0), Color.Gold);
}
DrawBall(_poolBall, Color.Silver, Color.MediumPurple, Color.Purple);
BlitImage();
#endregion
}
protected void GetCollisionNormalAndPointsOfContact_SphereSphere(out MyVector normal, out double normalMagnitude, out MyVector pointOfContact1, out MyVector pointOfContact2, BallBlip ball1, BallBlip ball2)
{
// Vector that is perpendicular to the tangent of the collision, and it points in the direction of object 1. Real
// easy when dealing with spheres :)
normal = ball2.Ball.Position - ball1.Ball.Position;
// Remember this length
normalMagnitude = normal.GetMagnitude();
// This needs to be returned as a unit vector
normal.Divide(normalMagnitude);
// Start them off as unit vectors
pointOfContact1 = normal.Clone();
pointOfContact2 = normal.Clone();
// Finish (use the ratio of their radii)
pointOfContact1.Multiply((ball1.Ball.Radius / (ball1.Ball.Radius + ball2.Ball.Radius)) * normalMagnitude);
pointOfContact2.Multiply((ball2.Ball.Radius / (ball1.Ball.Radius + ball2.Ball.Radius)) * normalMagnitude * -1); // I want this one pointing the other direction
// Now that I have the points of contact relative to the centers of position, I need to make them
// relative to the centers of mass
if (ball1.TorqueBall != null)
{
pointOfContact1.Subtract(ball1.TorqueBall.CenterOfMass);
}
if (ball2.TorqueBall != null)
{
pointOfContact2.Subtract(ball2.TorqueBall.CenterOfMass);
}
}