/// <summary>
/// Calculates the glyph x positions of the specified text. Only the sub-string will be used.<br/>
/// Measures values are returned in local coordinate space.
/// </summary>
public static int TextGlyphPositions(this Nvg nvg, Vector2D <float> pos, string @string, string end, out GlyphPosition[] positions, int maxRows)
{
positions = new GlyphPosition[maxRows];
Fontstash fons = nvg.fontManager.Fontstash;
State state = nvg.stateStack.CurrentState;
float scale = nvg.fontManager.GetFontScale() * nvg.pixelRatio.DevicePxRatio;
float invscale = 1.0f / scale;
FonsQuad q = new();
int npos = 0;
if (state.FontId == Fontstash.INVALID)
{
return(0);
}
if (@string == end)
{
return(0);
}
fons.SetSize(state.FontSize * scale);
fons.SetSpacing(state.LetterSpacing * scale);
fons.SetBlur(state.FontBlur * scale);
fons.SetAlign((int)state.TextAlign);
fons.SetFont(state.FontId);
fons.TextIterInit(out FonsTextIter iter, pos.X * scale, pos.Y * scale, @string, end, FonsGlyphBitmap.Optional);
FonsTextIter prevIter = iter;
while (fons.TextIterNext(ref iter, ref q))
{
if (iter.prevGlyphIndex < 0 && nvg.fontManager.AllocTextAtlas())
{
iter = prevIter;
fons.TextIterNext(ref iter, ref q);
}
prevIter = iter;
positions[npos++] = new GlyphPosition(iter.str, iter.x * invscale, MathF.Min(iter.x, q.x0) * invscale, MathF.Max(iter.nextx, q.x1) * invscale);
if (npos >= maxRows)
{
return(npos);
}
}
return(npos);
}
/// <summary>
/// Breaks the specified text into lines. Only the sub-string will be used.<br/>
/// White space is stripped at the beginning of the rows, the text is split at word boundaries or when new-line characters are encountered.<br/>
/// Words longer than the max width are slit at nearest character (i.e. no hyphenation).
/// </summary>
public static int TextBreakLines(this Nvg nvg, string @string, string end, float breakRowWidth, out TextRow[] rows, int maxRows)
{
rows = new TextRow[maxRows];
Fontstash fons = nvg.fontManager.Fontstash;
State state = nvg.stateStack.CurrentState;
float scale = nvg.fontManager.GetFontScale() * nvg.pixelRatio.DevicePxRatio;
float invscale = 1.0f / scale;
FonsQuad q = new();
int nrows = 0;
float rowStartX = 0.0f;
float rowWidth = 0.0f;
float rowMinX = 0.0f;
float rowMaxX = 0.0f;
string rowStart = null;
string rowEnd = null;
string wordStart = null;
float wordStartX = 0.0f;
float wordMinX = 0.0f;
string breakEnd = null;
float breakWidth = 0.0f;
float breakMaxX = 0.0f;
CodepointType type, pType = CodepointType.Space;
uint pCodepoint = 0;
if (maxRows == 0)
{
return(0);
}
if (state.FontId == Fontstash.INVALID)
{
return(0);
}
if (@string == end || @string.Length == 0)
{
return(0);
}
fons.SetSize(state.FontSize * scale);
fons.SetSpacing(state.LetterSpacing * scale);
fons.SetBlur(state.FontBlur * scale);
fons.SetAlign((int)state.TextAlign);
fons.SetFont(state.FontId);
breakRowWidth *= scale;
fons.TextIterInit(out FonsTextIter iter, 0, 0, @string, end, FonsGlyphBitmap.Optional);
FonsTextIter prevIter = iter;
while (fons.TextIterNext(ref iter, ref q))
{
if (iter.prevGlyphIndex < 0 && nvg.fontManager.AllocTextAtlas())
{
iter = prevIter;
fons.TextIterNext(ref iter, ref q);
}
prevIter = iter;
switch (iter.codepoint)
{
case 9: // \t
case 11: // \v
case 12: // \f
case 32: // \space
case 0x00a0: // NBSP
type = CodepointType.Space;
break;
case 10: // \n
type = pCodepoint == 13 ? CodepointType.Space : CodepointType.Newline;
break;
case 13: // \r
type = pCodepoint == 10 ? CodepointType.Space : CodepointType.Newline;
break;
case 0x0085: // NEL
type = CodepointType.Newline;
break;
default:
if ((iter.codepoint >= 0x4E00 && iter.codepoint <= 0x9FFF) ||
(iter.codepoint >= 0x3000 && iter.codepoint <= 0x30FF) ||
(iter.codepoint >= 0xFF00 && iter.codepoint <= 0xFFEF) ||
(iter.codepoint >= 0x1100 && iter.codepoint <= 0x11FF) ||
(iter.codepoint >= 0x3130 && iter.codepoint <= 0x318F) ||
(iter.codepoint >= 0xAC00 && iter.codepoint <= 0xD7AF))
{
type = CodepointType.CJKChar;
}
else
{
type = CodepointType.Char;
}
break;
}
if (type == CodepointType.Newline)
{
rows[nrows++] = new TextRow()
{
Start = rowStart ?? iter.str,
End = rowEnd ?? iter.str,
Width = rowWidth * invscale,
MinX = rowMinX * invscale,
MaxX = rowMaxX * invscale,
Next = iter.next
};
if (nrows >= maxRows)
{
return(nrows);
}
breakEnd = rowStart;
breakWidth = 0.0f;
breakMaxX = 0.0f;
rowStart = null;
rowEnd = null;
rowWidth = 0.0f;
rowMinX = rowMaxX = 0.0f;
}
else
{
if (rowStart == null)
{
if (type == CodepointType.Char || type == CodepointType.CJKChar)
{
rowStartX = iter.x;
rowStart = iter.str;
rowEnd = iter.next;
rowWidth = iter.nextx - rowStartX;
rowMinX = q.x0 - rowStartX;
rowMaxX = q.x1 - rowStartX;
wordStart = iter.str;
wordStartX = iter.x;
wordMinX = q.x0 - rowStartX;
breakEnd = rowStart;
breakWidth = 0.0f;
breakMaxX = 0.0f;
}
}
else
{
float nextWidth = iter.nextx - rowStartX;
if (type == CodepointType.Char || type == CodepointType.CJKChar)
{
rowEnd = iter.next;
rowWidth = iter.nextx - rowStartX;
rowMaxX = q.x1 - rowStartX;
}
if (((pType == CodepointType.Char || pType == CodepointType.CJKChar) && type == CodepointType.Space) || type == CodepointType.CJKChar)
{
breakEnd = iter.str;
breakWidth = rowWidth;
breakMaxX = rowMaxX;
}
if ((pType == CodepointType.Space && (type == CodepointType.Char || type == CodepointType.CJKChar)) || type == CodepointType.CJKChar)
{
wordStart = iter.str;
wordStartX = iter.x;
wordMinX = q.x0;
}
if ((type == CodepointType.Char || type == CodepointType.CJKChar) && nextWidth > breakRowWidth)
{
if (breakEnd == rowStart)
{
rows[nrows++] = new TextRow()
{
Start = rowStart,
End = iter.str,
Width = rowWidth * invscale,
MinX = rowMinX * invscale,
MaxX = rowMaxX * invscale,
Next = iter.str
};
if (nrows >= maxRows)
{
return(nrows);
}
rowStartX = iter.x;
rowStart = iter.str;
rowEnd = iter.next;
rowWidth = iter.nextx - rowStartX;
rowMinX = q.x0 - rowStartX;
rowMaxX = q.x1 - rowStartX;
wordStart = iter.str;
wordStartX = iter.x;
wordMinX = q.x0 - rowStartX;
}
else
{
rows[nrows++] = new TextRow()
{
Start = rowStart,
End = breakEnd,
Width = breakWidth * invscale,
MinX = rowMinX * invscale,
MaxX = breakMaxX * invscale,
Next = wordStart
};
if (nrows >= maxRows)
{
return(nrows);
}
rowStartX = wordStartX;
rowStart = wordStart;
rowEnd = iter.next;
rowWidth = iter.nextx - rowStartX;
rowMinX = wordMinX - rowStartX;
rowMaxX = q.x1 - rowStartX;
}
breakEnd = rowStart;
breakWidth = 0.0f;
breakMaxX = 0.0f;
}
}
}
pCodepoint = iter.codepoint;
pType = type;
}
if (rowStart != null)
{
rows[nrows++] = new TextRow()
{
Start = rowStart,
End = rowEnd,
Width = rowWidth * invscale,
MinX = rowMinX * invscale,
MaxX = rowMaxX * invscale,
Next = end
};
}
return(nrows);
}
/// <summary>
/// Draws text string at specified location. Only the sub-string up to the end is drawn.
/// </summary>
public static float Text(this Nvg nvg, Vector2D <float> pos, string @string, string end)
{
Fontstash fons = nvg.fontManager.Fontstash;
State state = nvg.stateStack.CurrentState;
FonsQuad q = new();
float scale = nvg.fontManager.GetFontScale() * nvg.pixelRatio.DevicePxRatio;
float invscale = 1.0f / scale;
bool isFlipped = Maths.IsTransformFlipped(state.Transform);
if (state.FontId == Fontstash.INVALID)
{
return(pos.X);
}
fons.SetSize(state.FontSize * scale);
fons.SetSpacing(state.LetterSpacing * scale);
fons.SetBlur(state.FontBlur * scale);
fons.SetAlign((int)state.TextAlign);
fons.SetFont(state.FontId);
List <Vertex> vertices = new();
fons.TextIterInit(out FonsTextIter iter, pos.X * scale, pos.Y * scale, @string, end, FonsGlyphBitmap.Requiered);
FonsTextIter prevIter = iter;
while (fons.TextIterNext(ref iter, ref q))
{
Vector2D <float>[] c = new Vector2D <float> [4];
if (iter.prevGlyphIndex == -1)
{
if (vertices.Count != 0)
{
nvg.fontManager.RenderText(vertices);
vertices.Clear();
}
if (!nvg.fontManager.AllocTextAtlas()) // no memory
{
break;
}
iter = prevIter;
_ = fons.TextIterNext(ref iter, ref q);
if (iter.prevGlyphIndex == -1)
{
break;
}
}
prevIter = iter;
if (isFlipped)
{
float tmp = q.y0;
q.y0 = q.y1;
q.y1 = tmp;
tmp = q.t0;
q.t0 = q.t1;
q.t1 = tmp;
}
c[0] = nvg.TransformPoint(state.Transform, q.x0 * invscale, q.y0 * invscale);
c[1] = nvg.TransformPoint(state.Transform, q.x1 * invscale, q.y0 * invscale);
c[2] = nvg.TransformPoint(state.Transform, q.x1 * invscale, q.y1 * invscale);
c[3] = nvg.TransformPoint(state.Transform, q.x0 * invscale, q.y1 * invscale);
vertices.Add(new Vertex(c[0], q.s0, q.t0));
vertices.Add(new Vertex(c[2], q.s1, q.t1));
vertices.Add(new Vertex(c[1], q.s1, q.t0));
vertices.Add(new Vertex(c[0], q.s0, q.t0));
vertices.Add(new Vertex(c[3], q.s0, q.t1));
vertices.Add(new Vertex(c[2], q.s1, q.t1));
}
nvg.fontManager.FlushTextTexture();
nvg.fontManager.RenderText(vertices);
return(iter.nextx / scale);
}
