/// <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)
{
if (Unit == Unit.Cm)
{
return(new Size(DipHelper.CmToDip(Length), Height));
}
else if (Unit == Unit.Inch)
{
return(new Size(DipHelper.InchToDip(Length), Height));
}
else
{
return(base.MeasureOverride(availableSize));
}
}
/// <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 = this.ActualWidth;
this.VisualEdgeMode = EdgeMode.Aliased;
if (Marks == MarksLocation.Down)//hruler
{
drawingContext.DrawLine(BorderPen, new Point(0.0, Height), new Point(xDest, Height));
}
else//vruler
{
drawingContext.DrawLine(BorderPen, new Point(0.0, 0), new Point(xDest, 0));
}
double offset = 1;
double DrawLength = Length + 2;
double start = Math.Max(0, Convert.ToInt32(CountShift) / 100);
double unit = 100 / this.Zoom;
double n = start;
for (double dUnit = start; dUnit <= DrawLength * this.Zoom + start; dUnit++, n++)
{
double d = dUnit * 100;
for (int i = 1; i <= 9; i++)
{
if (i != 5)
{//mark:10,20...110,120..
double nDip10 = 100 * (dUnit + 0.1 * i) - CountShift + offset;
if (Marks == MarksLocation.Up)
{
drawingContext.DrawLine(ThinPen, new Point(nDip10, 0), new Point(nDip10, SegmentHeight / 3.0));
}
else
{
drawingContext.DrawLine(ThinPen, new Point(nDip10, Height), new Point(nDip10, Height - SegmentHeight / 3.0));
}
}
}//mark:50,150,250...
double dMiddle = 100 * (dUnit + 0.5) - CountShift + offset;
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));
}
//mark:100,200,300...
double dShift = d - CountShift + offset;
if (dShift != offset)
{
if (Marks == MarksLocation.Up)
{
drawingContext.DrawLine(p, new Point(dShift, 0), new Point(dShift, Height));
}
else
{
drawingContext.DrawLine(p, new Point(dShift, Height), new Point(dShift, 0));
}
}
if ((dUnit < DrawLength * this.Zoom + CountShift / 100))//(dUnit != 0.0) &&
{
double sNumber = Math.Round(n * 100 / this.Zoom);
string szRulerNumber = (sNumber).ToString(CultureInfo.CurrentCulture);
FormattedText ft = new FormattedText(
szRulerNumber,
CultureInfo.CurrentCulture,
FlowDirection.LeftToRight,
new Typeface("Arial"),
DipHelper.PtToDip(7),
new SolidColorBrush(Color.FromRgb(0x55, 0x55, 0x55)));
ft.SetFontWeight(FontWeights.Normal);
ft.TextAlignment = TextAlignment.Center;
//Draw text
if (Marks == MarksLocation.Up)
{
drawingContext.DrawText(ft, new Point(dShift + ft.Width / 2 + 2, Height - ft.Height));
}
else
{
drawingContext.DrawText(ft, new Point(dShift + ft.Width / 2 + 2, Height - SegmentHeight / 3.0 - ft.Height));//- SegmentHeight
}
}
}
}
