protected override void OnRender(DrawingContext drawingContext)
{
Rect rectAll = new Rect(0, 0, ActualWidth, ActualHeight);
drawingContext.DrawRectangle(Background, null, rectAll);
TimeDivision scale = GetTimeScale(ViewPort, ActualWidth);
TimeSpan earliestFull = RoundDown(Offset, scale.MajorScale);
TimeSpan currentPosition = earliestFull;
Typeface typeface = new Typeface(new FontFamily("Arial"), FontStyles.Normal, FontWeights.Normal, FontStretches.Normal);
if (ShowMarker)
{
double marker = TimeSpanToPosition(Marker);
drawingContext.DrawLine(new Pen(Brushes.Red, 1), new Point(marker, 0), new Point(marker, ActualHeight));
}
while (currentPosition <= Offset + ViewPort)
{
double x = TimeSpanToPosition(currentPosition);
drawingContext.DrawLine(new Pen(Brushes.White, 1), new Point(x, 32), new Point(x, 64));
FormattedText text = new FormattedText(GetText(currentPosition), CultureInfo.CurrentCulture, FlowDirection.LeftToRight, typeface, 10, Brushes.White);
drawingContext.DrawText(text, new Point(x - text.Width / 2, text.Height));
for (int i = 1; i < scale.Subdivisions; i++)
{
TimeSpan smallTicks = currentPosition + scale.MajorScale.Divide(scale.Subdivisions).Multiply(i);
double x2 = TimeSpanToPosition(smallTicks);
drawingContext.DrawLine(new Pen(Brushes.White, 1), new Point(x2, 48), new Point(x2, 64));
}
currentPosition += scale.MajorScale;
}
}
private static TimeDivision GetTimeScale(TimeSpan viewPort, double width)
{
double minSizePerMajorUnit = 100.0;
double units = width / minSizePerMajorUnit;
TimeSpan minTimeSpan = viewPort.Divide(units);
TimeSpan actualUnitTimeSpan = RoundUp(minTimeSpan);
TimeDivision result = new TimeDivision();
result.MajorScale = actualUnitTimeSpan;
if (result.MajorScale >= TimeSpan.FromMinutes(1))
{
result.Subdivisions = 6;
}
else
{
result.Subdivisions = 10;
}
return(result);
}