private Transform2d GetTextPositionTransform(GFNFont fnt, string txt, double x, double y, double size, double angle, TextAlign align, Transform2d t)
{
//computes the transformation needed to transform text drawn at origo to get to the wanted position
Transform2d res = Transform2d.Translate(x, y);
if (angle != 0.0)
{
res = Transform2d.Rotate(angle) * res;
}
if (align != TextAlign.BaseLeft)
{
double dx, dy;
GetTextAlignDXDY(fnt, txt, size, align, out dx, out dy);
res = Transform2d.Translate(dx, dy) * res;
}
res = Transform2d.Scale(size / fnt.CapHeight) * res;
if (t != null)
{
return(res * t);
}
return(res);
}
/// <summary>
/// Computes how the font should be moved from baseline left to obey a specified alignment
/// </summary>
private void GetTextAlignDXDY(GFNFont fnt, string txt, double size, TextAlign align, out double dx, out double dy)
{
dx = 0.0;
dy = 0.0;
double w, h;
//y align:
if ((align & TextAlignAtom.TEXT_BOTTOM) != 0)
{
dy = fnt.GetDescent(size);
}
else if ((align & TextAlignAtom.TEXT_CENTER_Y) != 0)
{
dy = -size * 0.5;
}
else if ((align & TextAlignAtom.TEXT_TOP) != 0)
{
dy = -fnt.GetAscent(size);
}
//else align is baseline, dy=0.0
//x align:
if ((align & TextAlignAtom.TEXT_RIGHT) != 0)
{
InternalGetTextSize(fnt, txt, size, out w, out h);
dx = -w;
}
else if ((align & TextAlignAtom.TEXT_CENTER_X) != 0)
{
InternalGetTextSize(fnt, txt, size, out w, out h);
dx = -w * 0.5;
}
//else align is left, dx=0.0 and we're done
}
private static GFNFont FindFont(string fontname)
{
GFNFont res = null;
string filename;
if (string.IsNullOrEmpty(fontname))
{
filename = "ISOCP";
}
else if (fontname[0] == '*') //undecorate name that forces use of internal fonts
{
filename = fontname.Substring(1).ToUpper();
}
else
{
filename = fontname.ToUpper(); //seems good as is
}
//already loaded?
if (loadedfonts.TryGetValue(filename, out res))
{
return(res);
}
//not loaded, try to load it now
Stream fontstream = StreamUtils.FindResourceStream(filename + ".gfn");
if (fontstream == null)
{ //the font was not found, recursivly use isocp
if (filename == "ISOCP") //avoid infinite recursion
{
throw new Exception("Fatal error: builtin font 'ISOCP' not found");
}
res = FindFont("ISOCP");
//remember the non-existing name maps to isocp font for future reference
loadedfonts[filename] = res;
return(res);
}
res = GFNFont.FromStream(fontstream);
fontstream.Close();
loadedfonts[filename] = res; //cache font for later use
return(res);
}
public static GFNFont FromString(string fntdef)
{
string[] lines = fntdef.Split('\n');
int linenum = 1;
bool hascapheight = false;
bool haslinespacing = false;
bool hasstyle = false;
bool hasascent = false;
bool hasdescent = false;
GFNFont res = new GFNFont();
foreach (string _line in lines)
{
string line = _line.Trim();
if (line == "") //skip empty line
{
continue;
}
int eqpos = line.LastIndexOf('=');
if (eqpos < 0)
{
throw new Exception("Invalid definition in font on line " + linenum.ToString());
}
string key = line.Substring(0, eqpos);
string val = line.Substring(eqpos + 1);
key = key.Trim();
val = val.Trim();
if (key.Length == 3)
{
key = key.Trim('\''); //allow for quoted characters to allow for space definition etc.
}
switch (key)
{
case "capheight":
hascapheight = true;
res.capheight = StrToFloat(val);
break;
case "linespacing":
haslinespacing = true;
res.linespacing = StrToFloat(val);
break;
case "style":
if (val == "stroke")
{
res.filled = false;
}
else if (val == "fill")
{
res.filled = true;
}
else
{
throw new Exception("Invalid style in font defintion, line " + linenum.ToString());
}
hasstyle = true;
break;
case "ascent":
res.ascent = StrToFloat(val);
hasascent = true;
break;
case "descent":
res.descent = StrToFloat(val);
hasdescent = true;
break;
case "remark":
if (string.IsNullOrEmpty(res.remark))
{
res.remark = val;
}
else
{
res.remark += "\n" + val;
}
break;
default:
if (key.Length != 1)
{
throw new Exception("Invalid definition in font file, key ='" + key + "' on line " + linenum.ToString());
}
try {
GFNGlyph glyph = ParseGlyph(val);
res.CharLUT[key[0]] = glyph;
}
catch (Exception exc) {
throw new Exception("Invalid font program on line " + linenum.ToString() + " : " + exc.Message);
}
break;
}
linenum++;
}
if (!hascapheight)
{
throw new Exception("capheight specifier in font missing");
}
if (!haslinespacing)
{
throw new Exception("linespacing specifier in font missing");
}
if (!hasstyle)
{
throw new Exception("style specifier in font missing");
}
if (!hasdescent)
{
throw new Exception("descent specifier in font missing");
}
if (!hasascent)
{
throw new Exception("ascent specifier in font missing");
}
return(res);
}
