private string[] MeasureString(PageText pt, Graphics g, out float[] width)
{
StyleInfo si = pt.SI;
string s = pt.Text;
System.DrawingCore.Font drawFont = null;
StringFormat drawFormat = null;
SizeF ms;
string[] sa = null;
width = null;
try
{
// STYLE
System.DrawingCore.FontStyle fs = 0;
if (si.FontStyle == FontStyleEnum.Italic)
{
fs |= System.DrawingCore.FontStyle.Italic;
}
// WEIGHT
switch (si.FontWeight)
{
case FontWeightEnum.Bold:
case FontWeightEnum.Bolder:
case FontWeightEnum.W500:
case FontWeightEnum.W600:
case FontWeightEnum.W700:
case FontWeightEnum.W800:
case FontWeightEnum.W900:
fs |= System.DrawingCore.FontStyle.Bold;
break;
default:
break;
}
drawFont = new System.DrawingCore.Font(StyleInfo.GetFontFamily(si.FontFamilyFull), si.FontSize, fs);
drawFormat = new StringFormat();
drawFormat.Alignment = StringAlignment.Near;
// Measure string
// pt.NoClip indicates that this was generated by PageTextHtml Build. It has already word wrapped.
if (pt.NoClip || pt.SI.WritingMode == WritingModeEnum.tb_rl) // TODO: support multiple lines for vertical text
{
ms = MeasureString(s, g, drawFont, drawFormat);
width = new float[1];
width[0] = Measurement.PointsFromPixels(ms.Width, g.DpiX); // convert to points from pixels
sa = new string[1];
sa[0] = s;
return(sa);
}
// handle multiple lines;
// 1) split the string into the forced line breaks (ie "\n and \r")
// 2) foreach of the forced line breaks; break these into words and recombine
s = s.Replace("\r\n", "\n"); // don't want this to result in double lines
string[] flines = s.Split(LINEBREAK);
List <string> lines = new List <string>();
List <float> lineWidths = new List <float>();
// remove the size reserved for left and right padding
float ptWidth = pt.W - pt.SI.PaddingLeft - pt.SI.PaddingRight;
if (ptWidth <= 0)
{
ptWidth = 1;
}
foreach (string tfl in flines)
{
string fl;
if (tfl.Length > 0 && tfl[tfl.Length - 1] == ' ')
{
fl = tfl.TrimEnd(' ');
}
else
{
fl = tfl;
}
// Check if entire string fits into a line
ms = MeasureString(fl, g, drawFont, drawFormat);
float tw = Measurement.PointsFromPixels(ms.Width, g.DpiX);
if (tw <= ptWidth)
{ // line fits don't need to break it down further
lines.Add(fl);
lineWidths.Add(tw);
continue;
}
// Line too long; need to break into multiple lines
// 1) break line into parts; then build up again keeping track of word positions
string[] parts = fl.Split(WORDBREAK); // this is the maximum split of lines
StringBuilder sb = new StringBuilder(fl.Length);
CharacterRange[] cra = new CharacterRange[parts.Length];
for (int i = 0; i < parts.Length; i++)
{
int sc = sb.Length; // starting character
sb.Append(parts[i]); // endding character
if (i != parts.Length - 1) // last item doesn't need blank
{
sb.Append(" ");
}
int ec = sb.Length;
CharacterRange cr = new CharacterRange(sc, ec - sc);
cra[i] = cr; // add to character array
}
// 2) Measure the word locations within the line
string wfl = sb.ToString();
WordStartFinish[] wordLocations = MeasureString(wfl, g, drawFont, drawFormat, cra);
if (wordLocations == null)
{
continue;
}
// 3) Loop thru creating new lines as needed
int startLoc = 0;
CharacterRange crs = cra[startLoc];
CharacterRange cre = cra[startLoc];
float cwidth = wordLocations[0].end; // length of the first
float bwidth = wordLocations[0].start; // characters need a little extra on start
string ts;
bool bLine = true;
for (int i = 1; i < cra.Length; i++)
{
cwidth = wordLocations[i].end - wordLocations[startLoc].start + bwidth;
if (cwidth > ptWidth)
{ // time for a new line
cre = cra[i - 1];
ts = wfl.Substring(crs.First, cre.First + cre.Length - crs.First);
lines.Add(ts);
lineWidths.Add(wordLocations[i - 1].end - wordLocations[startLoc].start + bwidth);
// Find the first non-blank character of the next line
while (i < cra.Length &&
cra[i].Length == 1 &&
fl[cra[i].First] == ' ')
{
i++;
}
if (i < cra.Length) // any lines left?
{ // yes, continue on
startLoc = i;
crs = cre = cra[startLoc];
cwidth = wordLocations[i].end - wordLocations[startLoc].start + bwidth;
}
else // no, we can stop
{
bLine = false;
}
// bwidth = wordLocations[startLoc].start - wordLocations[startLoc - 1].end;
}
else
{
cre = cra[i];
}
}
if (bLine)
{
ts = fl.Substring(crs.First, cre.First + cre.Length - crs.First);
lines.Add(ts);
lineWidths.Add(cwidth);
}
}
// create the final array from the Lists
string[] la = lines.ToArray();
width = lineWidths.ToArray();
return(la);
}
finally
{
if (drawFont != null)
{
drawFont.Dispose();
}
if (drawFormat != null)
{
drawFont.Dispose();
}
}
}
