static void Main()
{
// Create a SpringODE object that represents
// a 1.0 kg spring with a spring constant of
// 20 N/m and a damping coefficient of 1.5 N-s/m
double mass = 1.0;
double mu = 1.5;
double k = 20.0;
double x0 = -0.2;
SpringODE ode = new SpringODE(mass, mu, k, x0);
// Solve the ODE over a range of 7 seconds
// using a 0.1 second time increment.
double dt = 0.1;
Console.WriteLine("t x v");
Console.WriteLine("" + ode.GetTime() + " " + (float)ode.GetX() +
" " + (float)ode.GetVx());
while (ode.GetTime() <= 7.0)
{
ode.UpdatePositionAndVelocity(dt);
Console.WriteLine("" + ode.GetTime() + " " + (float)ode.GetX() +
" " + (float)ode.GetVx());
}
return;
}
// This method redraws the GUI display.
private void UpdateDisplay()
{
Graphics g = drawingPanel.CreateGraphics();
int width = drawingPanel.Width - 1;
int height = drawingPanel.Height - 1;
// Clear the current display.
g.Clear(drawingPanel.BackColor);
Pen blackPen = new Pen(Color.Black, 2);
g.DrawLine(blackPen, 0, 20, width, 20);
// Update the position of the box and
// ball on the screen.
SolidBrush brush = new SolidBrush(Color.Black);
int zPosition = (int)(125 - 100.0 * spring.GetX());
g.FillRectangle(brush, 65, zPosition, 20, 20);
g.DrawLine(blackPen, 75, 20, 75, zPosition + 10);
// Clean up the Graphics object.
g.Dispose();
}