public static float LineWidth(this Paragraph para, int lineIndex)
{
if (para.Breaks.Count == 0)
{
return(para.Glyphs.Sum(gx => gx.Width));
}
BreakList.Node n = para.Breaks.Head.Skip(lineIndex - 1);
if (n == null)
{
return(0);
}
GlyphList.Node g = para.Glyphs.Head;
int idx = n.Value;
g = g.Skip(idx);
n = n.Next;
float w = 0;
while (g != null && (n == null || idx++ < n.Value))
{
w += g.Value.Width;
g = g.Next;
}
return(w);
}
public static IEnumerable <float> LineWidths(this Paragraph para)
{
if (para.Breaks.Count == 0)
{
yield return(para.Glyphs.Sum(g => g.Width));
}
else
{
BreakList.Node n = para.Breaks.Head;
GlyphList.Node g = para.Glyphs.Head;
float w = 0;
int i = 0;
while (n != null)
{
while (g != null && ++i <= n.Value)
{
w += g.Value.Width;
g = g.Next;
}
i--;
yield return(w);
n = n.Next;
w = 0;
}
while (g != null)
{
w += g.Value.Width;
g = g.Next;
}
yield return(w);
}
}
// used for cursor placement
public static ParagraphPosition PositionAtLineWidth(this Paragraph para, float width, int line)
{
if (para.Glyphs == null || para.Glyphs.Count == 0 || line < 0 || line >= para.LineCount)
{
return(ParagraphPosition.Empty);
}
GlyphList.Node ng = para.Glyphs.Head;
int breakIndex = -1;
BreakList.Node nb = para.Breaks.Head;
if (nb != null)
{
breakIndex = nb.Value;
}
int i = 0;
float w = 0;
float whalf = (int)(ng.Value.Width / 2f + 0.5f);
int x = 0;
int y = 0;
while ((y < line || (w + whalf <= width)) && ng.Next != null)
{
if (i == breakIndex - 1)
{
if (y >= line)
{
return(new ParagraphPosition(i, x, y, w.Ceil(), ng.Value.Width));
}
w = 0;
whalf = (int)(ng.Value.Width / 2f + 0.5f);
x = 0;
y++;
nb = nb.Next;
if (nb != null)
{
breakIndex = nb.Value;
}
}
else
{
x++;
w += ng.Value.Width;
whalf = (int)(ng.Value.Width / 2f + 0.5f);
}
ng = ng.Next;
i++;
}
return(new ParagraphPosition(i, x, y, w.Ceil(), ng.Value.Width));
}
public static int EolIndex(this Paragraph para, int line)
{
if (para.Breaks.Count == 0)
{
return(para.Length - 1);
}
BreakList.Node n = para.Breaks.Head;
n = n.Skip(line);
if (n == null)
{
return(para.Length - 1);
}
return(n.Value - 1);
}
public static int LineFromPosition(this Paragraph para, int pos)
{
if (pos == 0 || para.Breaks.Count == 0)
{
return(0);
}
BreakList.Node n = para.Breaks.Head;
int line = 0;
while (n != null && n.Value <= pos)
{
n = n.Next;
line++;
}
return(line);
}
// used for general purpose
public static ParagraphPosition PositionAtIndex(this Paragraph para, int pos)
{
if (para.Glyphs == null || para.Glyphs.Count == 0 || pos <= 0)
{
return(ParagraphPosition.Empty);
}
pos = pos.Clamp(0, para.Glyphs.Count - 1);
GlyphList.Node ng = para.Glyphs.Head;
int breakIndex = -1;
BreakList.Node nb = para.Breaks.Head;
if (nb != null)
{
breakIndex = nb.Value;
}
int i = 0;
int x = 0;
int w = 0;
int y = 0;
while (i < pos && ng.Next != null)
{
if (i == breakIndex - 1)
{
w = 0;
x = 0;
y++;
nb = nb.Next;
if (nb != null)
{
breakIndex = nb.Value;
}
}
else
{
x++;
w += ng.Value.Width;
}
i++;
ng = ng.Next;
}
return(new ParagraphPosition(pos, x, y, w, ng.Value.Width));
}
public static int FastPositionAtIndex(this Paragraph para, int pos)
{
if (para.Breaks.Count == 0)
{
return(pos);
}
BreakList.Node n = para.Breaks.Head;
while (n != null && n.Next != null && n.Next.Value - 1 < pos)
{
n = n.Next;
}
if (n == null)
{
return(pos);
}
if (pos < n.Value)
{
return(pos);
}
return(pos - n.Value);
}
public static int PositionAtLineIndex(this Paragraph para, int col, int line)
{
if (para.Breaks.Count == 0)
{
return(col.Clamp(0, para.Length - 1));
}
BreakList.Node n = para.Breaks.Head;
if (line == 0)
{
return(col.Clamp(0, n.Value - 1));
}
n = n.Skip(line - 1);
if (n == null)
{
return(para.Length - 1);
}
if (n.Next == null)
{
return(Math.Min(n.Value + col, para.Length - 1));
}
return(Math.Min(n.Value + col, n.Next.Value - 1));
}
