private static int CalculateTextWidth(string text, BitmapFont font)
{
var lineWidth = 0;
var nextCharacterStartPoint = 0;
foreach (var character in text)
{
var fontCharacter = font.GetCharacter(character);
if (fontCharacter == null)
{
continue;
}
if (fontCharacter.Width > 0 && !fontCharacter.IsWhitespace)
{
lineWidth = nextCharacterStartPoint + fontCharacter.Width;
}
nextCharacterStartPoint += fontCharacter.Advance;
}
return(lineWidth);
}
public static List <BitmapTextLine> DivideSinglelineIntoLines(BitmapFont font, string text, float availableWidth, float fontScale)
{
var finalLines = new List <BitmapTextLine>();
var lineStartPosition = 0;
var lineEndPosition = 0;
var wordBeginning = 0;
var hadBreakingPoint = false;
var nextCharacterStartPoint = 0f;
var isLineFinished = false;
for (var characterIndex = 0; characterIndex < text.Length; characterIndex++)
{
char character = text[characterIndex];
var fontCharacter = font.GetCharacter(character);
if (IsNewline(character))
{
isLineFinished = true;
lineEndPosition = characterIndex + 1;
hadBreakingPoint = true;
}
else if (!font.HasCharacter(character))
{
continue;
}
else if (fontCharacter.Width > 0 && nextCharacterStartPoint + fontCharacter.Width * fontScale > availableWidth)
{
isLineFinished = true;
if (hadBreakingPoint)
{
lineEndPosition = wordBeginning;
}
else if (wordBeginning == characterIndex)
{
lineEndPosition = characterIndex + 1;
}
else
{
lineEndPosition = characterIndex;
}
}
else
{
nextCharacterStartPoint += fontCharacter.Advance * fontScale;
if (IsLineBreakCharacter(character))
{
wordBeginning = characterIndex + 1;
hadBreakingPoint = true;
}
}
if (isLineFinished)
{
if (lineEndPosition > text.Length)
{
break;
}
var newLine = text.Substring(lineStartPosition, lineEndPosition - lineStartPosition);
var lineWidth = CalculateTextWidth(newLine, font) * fontScale;
Debug.Assert(lineWidth <= availableWidth || newLine.Length == 1);
finalLines.Add(new BitmapTextLine(newLine, lineWidth));
lineStartPosition = lineEndPosition;
wordBeginning = lineEndPosition;
nextCharacterStartPoint = 0;
isLineFinished = false;
hadBreakingPoint = false;
characterIndex = lineEndPosition - 1;
}
}
var finalLine = text.Substring(lineStartPosition);
if (finalLine.Length > 0)
{
var lineWidth = CalculateTextWidth(finalLine, font) * fontScale;
Debug.Assert(lineWidth <= availableWidth || finalLine.Length == 1);
finalLines.Add(new BitmapTextLine(finalLine, lineWidth));
}
else if (text == "")
{
finalLines.Add(new BitmapTextLine("", 0));
}
return(finalLines);
}