/// <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), Height);
}
else
{
desiredSize = new Size(DipHelper.InchToDip(Length), 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(DrawingContext drawingContext)
{
base.OnRender(drawingContext);
double xDest = (Unit == Unit.Cm ? DipHelper.CmToDip(Length) : DipHelper.InchToDip(Length)) * this.Zoom;
drawingContext.DrawRectangle(null, BorderPen, new Rect(new Point(0.0, 0.0), new Point(xDest, Height)));
double chip = Unit == Unit.Cm ? DipHelper.CmToDip(Chip) : DipHelper.InchToDip(Chip);
drawingContext.DrawLine(RedPen, new Point(chip, 0), new Point(chip, Height));
for (double dUnit = 0; dUnit <= Length; dUnit++)
{
double d;
if (Unit == Unit.Cm)
{
d = DipHelper.CmToDip(dUnit) * this.Zoom;
if (dUnit < Length)
{
for (int i = 1; i <= 9; i++)
{
if (i != 5)
{
double dMm = DipHelper.CmToDip(dUnit + 0.1 * i) * this.Zoom;
if (Marks == MarksLocation.Up)
{
drawingContext.DrawLine(ThinPen, new Point(dMm, 0), new Point(dMm, SegmentHeight / 3.0));
}
else
{
drawingContext.DrawLine(ThinPen, new Point(dMm, Height), new Point(dMm, Height - SegmentHeight / 3.0));
}
}
}
double dMiddle = DipHelper.CmToDip(dUnit + 0.5) * this.Zoom;
if (Marks == MarksLocation.Up)
{
drawingContext.DrawLine(p, new Point(dMiddle, 0), new Point(dMiddle, SegmentHeight * 2.0 / 3.0));
}
else
{
drawingContext.DrawLine(p, new Point(dMiddle, Height), new Point(dMiddle, Height - SegmentHeight * 2.0 / 3.0));
}
}
}
else
{
d = DipHelper.InchToDip(dUnit) * this.Zoom;
if (dUnit < Length)
{
if (Marks == MarksLocation.Up)
{
double unit = 0.125d;
for (int i = 0; i < 8; i++)
{
double length = DipHelper.InchToDip(dUnit + ((i + 1) * unit)) * this.Zoom;
if ((i + 1) % 4 == 0)
{
drawingContext.DrawLine(ThinPen, new Point(length, 0), new Point(length, SegmentHeight * 2D / 3D));
}
else
{
drawingContext.DrawLine(ThinPen, new Point(length, 0), new Point(length, SegmentHeight / 3.0));
}
}
}
else
{
double unit = 0.125d;
for (int i = 0; i < 8; i++)
{
double length = DipHelper.InchToDip(dUnit + ((i + 1) * unit)) * this.Zoom;
if ((i + 1) % 4 == 0)
{
drawingContext.DrawLine(ThinPen, new Point(length, Height), new Point(length, SegmentHeight * 2D / 3D));
}
else
{
drawingContext.DrawLine(ThinPen, new Point(length, Height), new Point(length, SegmentHeight / 3.0));
}
}
}
}
}
if (Marks == MarksLocation.Up)
{
drawingContext.DrawLine(p, new Point(d, 0), new Point(d, SegmentHeight));
}
else
{
drawingContext.DrawLine(p, new Point(d, Height), new Point(d, Height - SegmentHeight));
}
if ((dUnit != 0.0) && (dUnit < Length))
{
FormattedText ft = new FormattedText(
(dUnit + CountShift).ToString(CultureInfo.CurrentCulture),
CultureInfo.CurrentCulture,
FlowDirection.LeftToRight,
new Typeface("Arial"),
DipHelper.PtToDip(6),
Brushes.DimGray);
ft.SetFontWeight(FontWeights.Regular);
ft.TextAlignment = TextAlignment.Center;
if (Marks == MarksLocation.Up)
{
drawingContext.DrawText(ft, new Point(d, Height - ft.Height));
}
else
{
drawingContext.DrawText(ft, new Point(d, Height - SegmentHeight - ft.Height));
}
}
}
}