public void Draw()
{
drawXOffset = 0;
drawYOffset = (int)canvasTracing.ActualHeight / 2;
drawXMultiplier = (int)canvasTracing.ActualWidth / wfStrip.lengthSeconds;
drawYMultiplier = -(int)canvasTracing.ActualHeight / 2;
if (wfStrip.Points.Count < 2)
{
return;
}
wfStrip.RemoveNull();
wfStrip.Sort();
drawPath = new Path {
Stroke = drawBrush, StrokeThickness = 1
};
drawGeometry = new StreamGeometry {
FillRule = FillRule.EvenOdd
};
using (drawContext = drawGeometry.Open()) {
drawContext.BeginFigure(new System.Windows.Point(
(int)(wfStrip.Points [0].X * drawXMultiplier) + drawXOffset,
(int)(wfStrip.Points [0].Y * drawYMultiplier) + drawYOffset),
true, false);
for (int i = 1; i < wfStrip.Points.Count; i++)
{
if (wfStrip.Points [i].X > wfStrip.lengthSeconds * 2)
{
continue;
}
drawContext.LineTo(new System.Windows.Point(
(int)(wfStrip.Points [i].X * drawXMultiplier) + drawXOffset,
(int)(wfStrip.Points [i].Y * drawYMultiplier) + drawYOffset),
true, true);
}
}
drawGeometry.Freeze();
drawPath.Data = drawGeometry;
canvasTracing.Children.Clear();
canvasTracing.Children.Add(drawPath);
}
