/// <summary>
/// Creates an immutable clone of the <see cref="TextDecorationCollection"/>.
/// </summary>
/// <returns>The immutable clone.</returns>
public ImmutableTextDecoration[] ToImmutable()
{
var immutable = new ImmutableTextDecoration[Count];
for (var i = 0; i < Count; i++)
{
immutable[i] = this[i].ToImmutable();
}
return(immutable);
}
/// <summary>
/// Draws the <see cref="TextDecoration"/> at given origin.
/// </summary>
/// <param name="drawingContext">The drawing context.</param>
/// <param name="textDecoration">The text decoration.</param>
/// <param name="origin">The origin.</param>
private void DrawTextDecoration(IDrawingContextImpl drawingContext, ImmutableTextDecoration textDecoration, Point origin)
{
var textFormat = Style.TextFormat;
var fontMetrics = Style.TextFormat.FontMetrics;
var thickness = textDecoration.Pen?.Thickness ?? 1.0;
switch (textDecoration.PenThicknessUnit)
{
case TextDecorationUnit.FontRecommended:
switch (textDecoration.Location)
{
case TextDecorationLocation.Underline:
thickness = fontMetrics.UnderlineThickness;
break;
case TextDecorationLocation.Strikethrough:
thickness = fontMetrics.StrikethroughThickness;
break;
}
break;
case TextDecorationUnit.FontRenderingEmSize:
thickness = textFormat.FontRenderingEmSize * thickness;
break;
}
switch (textDecoration.Location)
{
case TextDecorationLocation.Overline:
origin += new Point(0, textFormat.FontMetrics.Ascent);
break;
case TextDecorationLocation.Strikethrough:
origin += new Point(0, -textFormat.FontMetrics.StrikethroughPosition);
break;
case TextDecorationLocation.Underline:
origin += new Point(0, -textFormat.FontMetrics.UnderlinePosition);
break;
}
switch (textDecoration.PenOffsetUnit)
{
case TextDecorationUnit.FontRenderingEmSize:
origin += new Point(0, textDecoration.PenOffset * textFormat.FontRenderingEmSize);
break;
case TextDecorationUnit.Pixel:
origin += new Point(0, textDecoration.PenOffset);
break;
}
var pen = new ImmutablePen(
textDecoration.Pen?.Brush ?? Style.Foreground.ToImmutable(),
thickness,
textDecoration.Pen?.DashStyle?.ToImmutable(),
textDecoration.Pen?.LineCap ?? default,
textDecoration.Pen?.LineJoin ?? PenLineJoin.Miter,
textDecoration.Pen?.MiterLimit ?? 10.0);
drawingContext.DrawLine(pen, origin, origin + new Point(GlyphRun.Bounds.Width, 0));
}
