/// <summary>
/// Measures an instance during the first layout pass prior to arranging it.
/// </summary>
/// <param name="availableSize">A maximum Size to not exceed.</param>
/// <returns>The maximum Size for the instance.</returns>
protected override Size MeasureOverride(Size availableSize)
{
Size desiredSize;
if (Unit == Unit.Cm)
{
desiredSize = new Size(DipHelper.CmToDip(Length), this.Height);
}
else
{
desiredSize = new Size(DipHelper.InchToDip(Length), this.Height);
}
return(desiredSize);
}
/// <summary>
/// Participates in rendering operations.
/// </summary>
/// <param name="drawingContext">The drawing instructions for a specific element. This context is provided to the layout system.</param>
protected override void OnRender(System.Windows.Media.DrawingContext drawingContext)
{
base.OnRender(drawingContext);
double xDest;
if (Unit == Unit.Cm)
{
xDest = DipHelper.CmToDip(Length);
}
else
{
xDest = DipHelper.InchToDip(Length);
}
drawingContext.DrawRectangle(null, _pBorder, new Rect(new Point(0.0, 0.0), new Point(xDest, this.Height)));
for (double dUnit = 0.0; dUnit <= Length; dUnit++)
{
double d;
if (Unit == Unit.Cm)
{
d = DipHelper.CmToDip(dUnit);
if (dUnit < Length)
{
for (int i = 1; i <= 9; i++)
{
if (i != 5)
{
double dMm = DipHelper.CmToDip(dUnit + 0.1 * i);
drawingContext.DrawLine(_pThin, new Point(dMm, this.Height), new Point(dMm, this.Height - _segmentHeight / 3.0));
}
}
double dMiddle = DipHelper.CmToDip(dUnit + 0.5);
drawingContext.DrawLine(_p, new Point(dMiddle, this.Height), new Point(dMiddle, this.Height - _segmentHeight * 2.0 / 3.0));
}
}
else
{
d = DipHelper.InchToDip(dUnit);
if (dUnit < Length)
{
double dQuarter = DipHelper.InchToDip(dUnit + 0.25);
drawingContext.DrawLine(_pThin, new Point(dQuarter, this.Height), new Point(dQuarter, this.Height - _segmentHeight / 3.0));
double dMiddle = DipHelper.InchToDip(dUnit + 0.5);
drawingContext.DrawLine(_p, new Point(dMiddle, this.Height), new Point(dMiddle, this.Height - 0.5 * _segmentHeight * 2.0 / 3.0));
double d3Quarter = DipHelper.InchToDip(dUnit + 0.75);
drawingContext.DrawLine(_pThin, new Point(d3Quarter, this.Height), new Point(d3Quarter, this.Height - 0.25 * _segmentHeight / 3.0));
}
}
drawingContext.DrawLine(_p, new Point(d, this.Height), new Point(d, this.Height - _segmentHeight));
if ((dUnit != 0.0) && (dUnit < Length))
{
FormattedText ft = new FormattedText(
dUnit.ToString(CultureInfo.CurrentCulture),
CultureInfo.CurrentCulture,
FlowDirection.LeftToRight,
new Typeface("Arial"),
DipHelper.PtToDip(10.0),
Brushes.Black);
ft.SetFontWeight(FontWeights.Regular);
ft.TextAlignment = TextAlignment.Center;
drawingContext.DrawText(ft, new Point(d, this.Height - _segmentHeight - ft.Height));
}
}
}