public async Task DrawBezierCurve(CancellationToken cancellationToken)
{
using (_splineBasePoints.Frost())
{
var bezierDrawer = _bezierDrawer = new BezierDrawer(_splineBasePoints);
while (!cancellationToken.IsCancellationRequested && bezierDrawer.MoveToNextPoint())
{
InvalidateVisual();
try { await Task.Delay(5, cancellationToken); }
catch (TaskCanceledException) { }
}
}
InvalidateVisual();
}
private void RenderBezierLine(DrawingContext drawingContext, BezierDrawer bezierDrawer)
{
if (bezierDrawer == null)
{
return;
}
if (DrawingInProgress)
{
bezierDrawer.DrawIntermediateLines(drawingContext);
}
var primaryLine = bezierDrawer.PrimaryLinePoints;
for (var i = 1; i < primaryLine.Count; i++)
{
drawingContext.DrawLine(PrimaryLinePen, primaryLine[i - 1], primaryLine[i]);
}
if (!bezierDrawer.Finished)
{
drawingContext.DrawEllipse(Brushes.Green, null, primaryLine.Last(), EllipseRadius, EllipseRadius);
}
}
