/// <summary>
/// 构建文本形状
/// </summary>
/// <param name="group">文本形状组</param>
/// <param name="x">横坐标</param>
/// <param name="y">纵坐标</param>
/// <param name="totalwidth">总宽度</param>
public void BuildTextSpan(GeometryGroup group, ref double x, ref double y, ref double totalwidth)
{
if (this.Node.NodeType == XmlNodeType.Element)
{
foreach (Tspan item in this.Children)
{
if (item == null)
{
continue;
}
item.BuildTextSpan(group, ref x, ref y, ref totalwidth);
}
return;
}
XText xtext = this.Node as XText;
if (xtext == null)
{
return;
}
string text = xtext.Value;
if (string.IsNullOrWhiteSpace(text))
{
return;
}
double baseline = y;
SVGBaseLineShift baseline_shift = this.GetAttributeValue <SVGBaseLineShift>("baseline-shift", true, null);
double font_size = this.GetAttributeValue <SVGDouble>("font-size", true, new SVGDouble(12)).GetValue(12);
if (baseline_shift != null)
{
if (baseline_shift == SVGBaseLineShift.Sub)
{
baseline += font_size * 0.5;
}
else if (baseline_shift == SVGBaseLineShift.Super)
{
baseline -= font_size * 1.25;
}
else if (baseline_shift != null)
{
baseline += font_size * baseline_shift.Value.GetValue(font_size);
}
}
Geometry geometry = this.BuildGlyphRun(text, x, baseline, ref totalwidth);
group.Children.Add(geometry);
x += totalwidth;
}
/// <summary>
/// 构建文本形状
/// </summary>
/// <param name="text">文本内容</param>
/// <param name="x">横坐标</param>
/// <param name="y">纵坐标</param>
/// <param name="totalwidth">总宽度</param>
/// <returns>形状</returns>
private Geometry BuildGlyphRun(string text, double x, double y, ref double totalwidth)
{
double baseline = y;
SVGBaseLineShift baseline_shift = this.GetAttributeValue <SVGBaseLineShift>("baseline-shift", true, null);
double font_size = this.GetAttributeValue <SVGDouble>("font-size", true, new SVGDouble(12)).GetValue(12);
SVGFontFamily font_family = this.GetAttributeValue <SVGFontFamily>("font-family", true, SVGFontFamily.Default);
SVGFontWeight font_weight = this.GetAttributeValue <SVGFontWeight>("font-weight", true, SVGFontWeight.Default);
SVGFontStyle font_style = this.GetAttributeValue <SVGFontStyle>("font-style", true, SVGFontStyle.Default);
SVGTextAnchor text_anchor = this.GetAttributeValue <SVGTextAnchor>("text-anchor", true, SVGTextAnchor.Default);
SVGTextDecoration text_decoration = this.GetAttributeValue <SVGTextDecoration>("text-decoration", true, null);
double letter_spacing = this.GetAttributeValue <SVGDouble>("letter-spacing", true, SVGDouble.Zero).GetValue(12);
double word_spacing = this.GetAttributeValue <SVGDouble>("word-spacing", true, SVGDouble.Zero).GetValue(12);
GlyphRun glyphs = null;
Typeface type_face = new Typeface(font_family.Value, font_style.Value, font_weight.Value, FontStretch.FromOpenTypeStretch(9), SVGFontFamily.Default.Value);
GlyphTypeface glyph_type_face;
if (!type_face.TryGetGlyphTypeface(out glyph_type_face))
{
return(null);
}
glyphs = new GlyphRun();
((System.ComponentModel.ISupportInitialize)glyphs).BeginInit();
glyphs.GlyphTypeface = glyph_type_face;
glyphs.FontRenderingEmSize = font_size;
List <char> text_chars = new List <char>();
List <ushort> glyph_indices = new List <ushort>();
List <double> advance_widths = new List <double>();
totalwidth = 0;
for (int i = 0; i < text.Length; ++i)
{
char c = text[i];
int code_point = c;
ushort glyph_index;
if (!glyph_type_face.CharacterToGlyphMap.TryGetValue(code_point, out glyph_index))
{
continue;
}
text_chars.Add(c);
double glyph_width = glyph_type_face.AdvanceWidths[glyph_index];
glyph_indices.Add(glyph_index);
advance_widths.Add(glyph_width * font_size + letter_spacing);
if (char.IsWhiteSpace(c))
{
advance_widths[advance_widths.Count - 1] += word_spacing;
}
totalwidth += advance_widths[advance_widths.Count - 1];
}
glyphs.Characters = text_chars.ToArray();
glyphs.GlyphIndices = glyph_indices.ToArray();
glyphs.AdvanceWidths = advance_widths.ToArray();
double alignmentoffset = 0;
if (text_anchor.Value == TextAlignment.Center)
{
alignmentoffset = totalwidth / 2;
}
else if (text_anchor.Value == TextAlignment.Right)
{
alignmentoffset = totalwidth;
}
glyphs.BaselineOrigin = new Point(x - alignmentoffset, baseline);
((System.ComponentModel.ISupportInitialize)glyphs).EndInit();
GeometryGroup result = new GeometryGroup();
result.Children.Add(glyphs.BuildGeometry());
if (text_decoration != null)
{
double decoration_pos = 0;
double decoration_thinkess = 0;
if (text_decoration.Value == TextDecorationLocation.Strikethrough)
{
decoration_pos = baseline - (type_face.StrikethroughPosition * font_size);
decoration_thinkess = type_face.StrikethroughThickness * font_size;
}
else if (text_decoration.Value == TextDecorationLocation.Underline)
{
decoration_pos = baseline - (type_face.UnderlinePosition * font_size);
decoration_thinkess = type_face.UnderlineThickness * font_size;
}
else if (text_decoration.Value == TextDecorationLocation.OverLine)
{
decoration_pos = baseline - font_size;
decoration_thinkess = type_face.StrikethroughThickness * font_size;
}
System.Windows.Rect bounds = new System.Windows.Rect(result.Bounds.Left, decoration_pos, result.Bounds.Width, decoration_thinkess);
result.Children.Add(new RectangleGeometry(bounds));
}
return(result);
}
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