/// <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>
/// Draws the values to show the current set of values in a line.
/// </summary>
/// <param name="g">The drawer</param>
private void DrawIt(Graphics g)
{
_timeShown.Text = _timeElapsed.ToString("E03");
Pen leftPen = new Pen(Brushes.Black, 5.0F);
Pen rightPen = new Pen(Brushes.Blue, 5.0F);
double heightDisplacement = this.Height / 2; // spacing from top
double sizeMult = 250; // size multiplier
double x1 = 0;
double y1 = _ycurrent.Element(0);
//Left Side
for (int i = 0; i <= 254 / 2; i++)
{
g.DrawLine(leftPen, (float)(x1 * sizeMult), (float)(y1 * sizeMult + heightDisplacement),
(float)((i * _dx) * sizeMult), (float)(_ycurrent[i] * sizeMult + heightDisplacement));
x1 = (i * _dx);
y1 = _ycurrent[i];
}
//right side
for (int i = 254 / 2; i < 255; i++)
{
g.DrawLine(rightPen, (float)(x1 * sizeMult), (float)(y1 * sizeMult + heightDisplacement),
(float)((i * _dx) * sizeMult), (float)(_ycurrent[i] * sizeMult + heightDisplacement));
x1 = (i * _dx);
y1 = _ycurrent[i];
}
leftPen.Dispose();
rightPen.Dispose();
}
