/// <summary>
/// Performs the rendering of the <c>Lissajous</c> curve on this panel.
/// </summary>
/// <param name="dc">Graphics context to render on.</param>
protected override void OnRender(DrawingContext dc)
{
const int MaxPens = 5;
double semiWidth = this.ActualWidth / 2;
double semiHeight = this.ActualHeight / 2;
double scaleFactor = this.ScaleFactor;
if (this.TheGenerator == null)
{
return;
}
SimpleTransform transform = new SimpleTransform(semiWidth, semiHeight, scaleFactor, scaleFactor);
Pen thinPen = new Pen(Brushes.DarkGray, 1.0f);
double y = transform.DirectY(this.TheGenerator.PointNow.Y);
Point pointEast = new Point(0, y);
Point pointWest = new Point(this.ActualWidth, y);
dc.DrawLine(thinPen, pointEast, pointWest);
double x = transform.DirectX(this.TheGenerator.PointNow.X);
Point pointNorth = new Point(x, 0);
Point pointSouth = new Point(x, this.ActualHeight);
dc.DrawLine(thinPen, pointNorth, pointSouth);
Point last = new Point(0, 0);
Pen[] pens = new Pen[MaxPens + 1];
for (int j = 0; j < MaxPens; j++)
{
var pen = new Pen(Brushes.LightGreen, MaxPens - j);
pen.StartLineCap = PenLineCap.Round;
pen.EndLineCap = PenLineCap.Round;
pens[j] = pen;
}
int i = 0;
foreach (var point in this.TheGenerator.Tail)
{
int index = i / 10;
if (index >= MaxPens)
{
index = MaxPens;
}
Point p = transform.Direct(new Point(point.X, point.Y));
if (i > 0)
{
dc.DrawLine(pens[index], last, p);
}
last = p;
i++;
}
}
