/// <summary>
/// Draw a string with formatting.
/// </summary>
/// <param name="batch"></param>
/// <param name="font"></param>
/// <param name="label"></param>
/// <param name="window"></param>
/// <param name="color"></param>
/// <param name="format"></param>
public static void DrawAlignedString(this SpriteBatch batch, SpriteFont font, string text, Rectangle area, Color color, BlockAlignment format)
{
if (batch == null)
{
throw new ArgumentNullException("batch");
}
if (font == null)
{
throw new ArgumentNullException("font");
}
if (text == null)
{
throw new ArgumentNullException("text");
}
float spaceWidth = font.MeasureString(" ").X;
int lineCount = FormattedLineCount(font, text, area.Width);
float y = area.Top, advance = font.LineSpacing;
switch (format.VerticalAlignment)
{
case Alignment.Near:
y = area.Top;
break;
case Alignment.Center:
y = (area.Height - lineCount * advance) / 2 + area.Top;
break;
case Alignment.Far:
y = area.Bottom - lineCount * advance;
break;
case Alignment.Full:
if (lineCount > 1)
{
advance = (area.Height - advance) / (lineCount - 1);
}
else
{
y = (area.Height - advance) / 2 + area.Top;
}
break;
default:
throw new Exception("Unknown or invalid vertical alignment value " + format.VerticalAlignment);
}
for (int lineStart = 0; lineStart < text.Length;)
{
int spaceCount = 0;
float totalLength = 0;
int lineEnd = lineStart;
Alignment alignment = format.HorizontalAlignment == Alignment.Full ? format.HorizontalPartialAlignment : format.HorizontalAlignment;
while (lineEnd < text.Length && text[lineEnd] != '\n')
{
int wordStart = lineEnd;
SkipWhite(text, ref lineEnd);
int spaceAdd = lineEnd - wordStart;
SkipNonWhite(text, ref lineEnd);
float add = font.MeasureString(text.Substring(wordStart, lineEnd - wordStart)).X;
if (totalLength > 0 && totalLength + add >= area.Width)
{
lineEnd = wordStart;
SkipWhite(text, ref lineEnd);
alignment = format.HorizontalAlignment;
break;
}
spaceCount += spaceAdd;
totalLength += add;
}
DrawTextLine(batch, font, text.Substring(lineStart, lineEnd - lineStart), area, color, format, y, spaceCount, spaceWidth, totalLength, alignment);
y += advance;
lineStart = lineEnd;
if (lineStart < text.Length && text[lineStart] == '\n')
{
lineStart++;
}
lineCount++;
}
}
static void DrawTextLine(SpriteBatch batch, SpriteFont font, string text, Rectangle area, Color color, BlockAlignment format, float y, float spaceCount, float spaceWidth, float totalLength, Alignment alignment)
{
float x;
switch (alignment)
{
case Alignment.Near:
batch.DrawString(font, text, new Vector2(area.Left, y).Floor(), color);
break;
case Alignment.Far:
x = area.Right - totalLength;
batch.DrawString(font, text, new Vector2(x, y).Floor(), color);
break;
case Alignment.Center:
x = (area.Width - totalLength) / 2 + area.Left;
batch.DrawString(font, text, new Vector2(x, y).Floor(), color);
break;
default:
throw new Exception("Unknown or invalid horizontal alignment value " + alignment);
}
}
