private List <Letter> DrawLetters(NameToken name, string text, IWritingFont font, TransformationMatrix fontMatrix, decimal fontSize, TransformationMatrix textMatrix)
{
var horizontalScaling = 1;
var rise = 0;
var letters = new List <Letter>();
var renderingMatrix =
TransformationMatrix.FromValues((double)fontSize * horizontalScaling, 0, 0, (double)fontSize, 0, rise);
var width = 0.0;
textSequence++;
for (var i = 0; i < text.Length; i++)
{
var c = text[i];
if (!font.TryGetBoundingBox(c, out var rect))
{
throw new InvalidOperationException($"The font does not contain a character: {c}.");
}
if (!font.TryGetAdvanceWidth(c, out var charWidth))
{
throw new InvalidOperationException($"The font does not contain a character: {c}.");
}
var advanceRect = new PdfRectangle(0, 0, charWidth, 0);
advanceRect = textMatrix.Transform(renderingMatrix.Transform(fontMatrix.Transform(advanceRect)));
var documentSpace = textMatrix.Transform(renderingMatrix.Transform(fontMatrix.Transform(rect)));
var letter = new Letter(c.ToString(), documentSpace, advanceRect.BottomLeft, advanceRect.BottomRight, width, (double)fontSize, FontDetails.GetDefault(name),
GrayColor.Black,
(double)fontSize,
textSequence);
letters.Add(letter);
var tx = advanceRect.Width * horizontalScaling;
var ty = 0;
var translate = TransformationMatrix.GetTranslationMatrix(tx, ty);
width += tx;
textMatrix = translate.Multiply(textMatrix);
}
return(letters);
}
public FontStored(AddedFont fontKey, IWritingFont fontProgram)
{
FontKey = fontKey ?? throw new ArgumentNullException(nameof(fontKey));
FontProgram = fontProgram ?? throw new ArgumentNullException(nameof(fontProgram));
}
