public static void DrawTextLine(
IFont font, Vector2 position, string text, Color4 color, float fontHeight, int start, int length, float letterSpacing,
SpriteList list, Action <int, Vector2, Vector2> onDrawChar = null, int tag = -1)
{
int j = 0;
if (list != null)
{
for (int i = 0; i < length; i++)
{
char ch = text[i + start];
if (ch != '\n' && ch != '\r' && font.CharSource.Get(ch, fontHeight) != FontChar.Null)
{
++j;
}
}
}
// Use array instead of list to reduce memory consumption.
var chars = new SpriteList.CharDef[j];
j = 0;
FontChar prevChar = null;
var halfLetterSpacing = letterSpacing * .5f;
float savedX = position.X;
for (int i = 0; i < length; i++)
{
char ch = text[i + start];
if (ch == '\n')
{
onDrawChar?.Invoke(i, position, Vector2.Down * fontHeight);
position.X = savedX;
position.Y += fontHeight;
prevChar = null;
continue;
}
else if (ch == '\r')
{
continue;
}
FontChar fontChar = font.CharSource.Get(ch, fontHeight);
if (fontChar == FontChar.Null)
{
onDrawChar?.Invoke(i, position, Vector2.Down * fontHeight);
continue;
}
var scale = fontChar.Height != 0.0f ? fontHeight / fontChar.Height : 0.0f;
// Pen Position + Bearing + Kerning gives a proper letter position
// but we have to subtract left padding in order to avoid extra spacing
position.X += scale * (fontChar.ACWidths.X + fontChar.Kerning(prevChar) + halfLetterSpacing - fontChar.Padding);
var size = new Vector2(scale * fontChar.PaddedWidth, fontHeight + scale * (fontChar.PaddedHeight - fontChar.VerticalOffset));
var charPosition = new Vector2(position.X, position.Y + scale * (fontChar.VerticalOffset - fontChar.Padding));
if (font.RoundCoordinates)
{
charPosition = new Vector2(charPosition.X.Round(), charPosition.Y.Round());
}
onDrawChar?.Invoke(i, charPosition, size);
chars[j].FontChar = fontChar;
chars[j].Position = charPosition;
++j;
// We have to add left padding to get actual letter position
// Width + (Horizontal Advance - Bearing) will give a proper pen position for next letter
position.X += scale * (fontChar.Width + fontChar.ACWidths.Y + halfLetterSpacing + fontChar.Padding);
prevChar = fontChar;
}
list.Add(font, color, fontHeight, chars, tag);
}
public static void DrawTextLine(
IFont font, Vector2 position, string text, Color4 color, float fontHeight, int start, int length, float letterSpacing,
SpriteList list, Action <int, Vector2, Vector2> onDrawChar = null, int tag = -1)
{
int j = 0;
if (list != null)
{
for (int i = 0; i < length; i++)
{
char ch = text[i + start];
if (ch != '\n' && ch != '\r' && font.Chars.Get(ch, fontHeight) != FontChar.Null)
{
++j;
}
}
}
// Use array instead of list to reduce memory consumption.
var chars = new SpriteList.CharDef[j];
j = 0;
FontChar prevChar = null;
float savedX = position.X;
for (int i = 0; i < length; i++)
{
char ch = text[i + start];
if (ch == '\n')
{
onDrawChar?.Invoke(i, position, Vector2.Down * fontHeight);
position.X = savedX;
position.Y += fontHeight;
prevChar = null;
continue;
}
else if (ch == '\r')
{
continue;
}
FontChar fontChar = font.Chars.Get(ch, fontHeight);
if (fontChar == FontChar.Null)
{
onDrawChar?.Invoke(i, position, Vector2.Down * fontHeight);
continue;
}
float scale = fontChar.Height != 0.0f ? fontHeight / fontChar.Height : 0.0f;
var xDelta = scale * (fontChar.ACWidths.X + fontChar.Kerning(prevChar) + letterSpacing);
position.X += xDelta;
var size = new Vector2(scale * fontChar.Width, fontHeight - fontChar.VerticalOffset);
Vector2 roundPos;
if (font.RoundCoordinates)
{
roundPos = new Vector2(position.X.Round(), position.Y.Round() + fontChar.VerticalOffset);
onDrawChar?.Invoke(i, new Vector2((position.X - xDelta).Round(), position.Y.Round()), size);
}
else
{
roundPos = new Vector2(position.X, position.Y + fontChar.VerticalOffset);
onDrawChar?.Invoke(i, new Vector2(position.X - xDelta, position.Y), size);
}
chars[j].FontChar = fontChar;
chars[j].Position = roundPos;
++j;
position.X += scale * (fontChar.Width + fontChar.ACWidths.Y);
prevChar = fontChar;
}
list.Add(font, color, fontHeight, chars, tag);
}
