/// <summary>
/// Occurs for each tick of the timer. Increases the time elapsed, the step number,
/// and moves the functions and creates a new future.
/// </summary>
private void TimeStep()
{
_timeElapsed += _dt;
_ypast = _ycurrent;
_ycurrent = _yfuture;
_yfuture = new YValues(_ypast, _ycurrent, _current);
// _numOfSteps++;
}
/// <summary>
/// Clears out the graphic and resets the program.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ClearButton_Click(object sender, EventArgs e)
{
_startButton.Enabled = true;
_resumeButton.Enabled = false;
_pauseButton.Enabled = false;
_clearButton.Enabled = false;
_timer.Enabled = false;
_graphics.Clear(Color.Beige);
_timeElapsed = 0;
_timeShown.Text = _timeElapsed.ToString("E03");
_graphics.Dispose();
_ycurrent = new YValues();
_ypast = new YValues();
_yfuture = new YValues();
}
/// <summary>
/// Initializes values with previous and current values at n*dt sec
/// </summary>
/// <param name="n">number of steps passed</param>
/// <param name="past">past values</param>
/// <param name="current">current values</param>
/// <param name="cblue">speed through current medium</param>
public YValues(YValues past, YValues current, int cblue)
{
_values[0] = 0;
_values[254] = 0;
double r2 = cblue * _dt / _dx;
for (int i = 1; i < _values.Length / 2; i++)
{
_values[i] = 2 * (1 - (_r1 * _r1)) * current.Element(i) - past.Element(i) +
_r1 * _r1 * (current.Element(i + 1) + current.Element(i - 1));
}
for (int i = _values.Length / 2; i < _values.Length - 1; i++)
{
_values[i] = 2 * (1 - (r2 * r2)) * current.Element(i) - past.Element(i) +
r2 * r2 * (current.Element(i + 1) + current.Element(i - 1));
}
}
/// <summary>
/// Changes the current medium, and resets the program.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void MaterialsList_SelectedIndexChanged(object sender, EventArgs e)
{
_timer.Enabled = false;
_startButton.Enabled = true;
_pauseButton.Enabled = false;
_resumeButton.Enabled = false;
_clearButton.Enabled = false;
_timeElapsed = 0;
_timeShown.Text = _timeElapsed.ToString("E03");
int selected = _materialsList.SelectedIndex;
if (selected == 5)
{
var rng = SmallRng.Create();
selected = _dist.Sample(rng);
}
if (selected == 0)
{
_current = _glass;
}
else if (selected == 1)
{
_current = _diamond;
}
else if (selected == 2)
{
_current = _water;
}
else if (selected == 3)
{
_current = _air;
}
else if (selected == 4)
{
_current = _brett;
}
_ycurrent = new YValues();
_ypast = new YValues();
_yfuture = new YValues();
}