private void testCoordinateMapping()
{
TranslateTransform t = new TranslateTransform();
Flatbody a = new Flatbody(new Point(0, 0));
t = sim.renderer.CircleTransform(a);
Flatbody b = new Flatbody(new Point(-500, 0));
t = sim.renderer.CircleTransform(b);
Flatbody c = new Flatbody(new Point(500, 0));
t = sim.renderer.CircleTransform(c);
Flatbody d = new Flatbody(new Point(0, 500));
t = sim.renderer.CircleTransform(d);
Flatbody e = new Flatbody(new Point(0, -500));
t = sim.renderer.CircleTransform(e);
}
public Point BodyToBodyAccelerate(Flatbody otherBody)
{
// was 10.0
const double rMinimum = 0.1; // we are not simulating collisions so don't let accelerations run away as bodies
// approach 0.0 separation
const double rMinSquared = rMinimum * rMinimum;
double dX = otherBody.position.X - this.position.X;
double dY = otherBody.position.Y - this.position.Y;
double rSquared = (dX * dX) + (dY * dY);
rSquared = Math.Max(rSquared, rMinSquared); // enforce minimum value of r
double a = otherBody.mass / rSquared; //F = ma, g = m * m2 / rSquared, m's cancel out so a = m2 / rSquared
double r = Math.Sqrt(rSquared);
// return aX, aY
return(new Point(a * dX / r, a * dY / r));
}
// Needs to be marshalled onto the UI thread
public void UpdateMonitoredValues(Flatbody body, double simElapsedTime)
{
positionTextBlock.Text = "position = " + FormatPointToString(body.Position);
velocityTextBlock.Text = "velocity = " + FormatPointToString(body.Velocity);
timeTextBlock.Text = String.Format("time = {0:F3}", simElapsedTime);
}