/// <summary>
/// Measures a single line of text (no wrapping) and returns the size required,
/// and the number of characters fitted into that line. Uses the current font and size.
/// </summary>
/// <param name="chars"></param>
/// <param name="startIndex"></param>
/// <param name="available"></param>
/// <param name="options"></param>
/// <param name="charsfitted"></param>
/// <returns></returns>
/// <remarks>Uses the TTFFontFile if available, otherwise will default to using the GDI+ measure,
/// which is slower but supports postscript fonts</remarks>
public PDFSize MeasureString(string chars, int startIndex, PDFSize available, PDFTextRenderOptions options, out int charsfitted)
{
PDFFontResource frsc = this.CurrentFontResource;
PDFUnit fsize = this.CurrentFont.Size;
if (null == frsc)
{
throw new InvalidOperationException("Current font has not be set on the graphics class, so strings cannot be measured");
}
PDFFontDefinition defn = frsc.Definition;
PDFSize measured;
if (defn.CanMeasureStrings)
{
bool trimtoword = true;
if (options.WrapText.HasValue)
{
if (options.WrapText == WordWrap.NoWrap)
{
available.Width = new PDFUnit(int.MaxValue, PageUnits.Points);
}
else if (options.WrapText == WordWrap.Character)
{
trimtoword = false;
}
}
bool vertical = false; // Not currently supported.
//inspect the spacing values - if any are set then we must use them in the calculations
bool complexSpacing = false;
double?wordSpace = null;
double charSpace = Scryber.OpenType.TTFFile.NoCharacterSpace;
double hScale = Scryber.OpenType.TTFFile.NoHorizontalScale;
if (options.WordSpacing.HasValue)
{
complexSpacing = true;
wordSpace = options.WordSpacing.Value.PointsValue;
}
if (options.CharacterSpacing.HasValue)
{
complexSpacing = true;
charSpace = options.CharacterSpacing.Value.PointsValue;
}
if (options.CharacterHScale.HasValue)
{
complexSpacing = true;
hScale = options.CharacterHScale.Value;
}
if (complexSpacing)
{
//TODO: Check if we can do this on the widths rather than the ttfile.
measured = defn.MeasureStringWidth(chars, startIndex, fsize.PointsValue, available.Width.PointsValue, wordSpace, charSpace, hScale, vertical, trimtoword, out charsfitted);
}
else
{
//TODO: Check if we can do this on the widths rather than the ttfile.
measured = defn.MeasureStringWidth(chars, startIndex, fsize.PointsValue, available.Width.PointsValue, trimtoword, out charsfitted);
}
if (charsfitted > 0)
{
this.RegisterStringUse(chars, startIndex, charsfitted);
}
}
else
{
throw new NotSupportedException("The font definition cannot measure strings");
//if (startIndex > 0)
// chars = chars.Substring(startIndex);
//measured = this.MeasureGraphicsString(chars, available, options.WrapText.HasValue ? options.WrapText.Value : WordWrap.Auto, out charsfitted);
}
return(measured);
}
