public TextVertex[] GenTextMesh(string text)
{
string[] lines = Regex.Split(text, "\r\n|\r|\n");
TextVertex[][] vertexArrays = new TextVertex[lines.Length][];
float scale = 1f / font.LineHeight;
int spaceWidth = font.PaddingTop + font.PaddingBottom;
float yOffset = 0f;
if (VerticalAlignment == VerticalAlignment.Center)
{
yOffset = -(font.LineHeight - spaceWidth) * scale * lines.Length * 0.5f;
}
else if (VerticalAlignment == VerticalAlignment.Top)
{
yOffset = -(font.LineHeight - spaceWidth) * scale * lines.Length;
}
int vertCount = 0;
for (int i = 0; i < lines.Length; i++)
{
float xOffset = 0f;
if (HorizontalAlignment == HorizontalAlignment.Center)
{
xOffset = -GetLineWidth(lines[i]) * 0.5f;
}
else if (HorizontalAlignment == HorizontalAlignment.Right)
{
xOffset = -GetLineWidth(lines[i]);
}
yOffset += (font.LineHeight - spaceWidth) * scale;
vertexArrays[i] = GenSingleLineMesh(lines[i], xOffset, yOffset);
vertCount += vertexArrays[i].Length;
}
//combine
TextVertex[] vertices = new TextVertex[vertCount];
int offset = 0;
for (int i = 0; i < vertexArrays.Length; i++)
{
for (int j = 0; j < vertexArrays[i].Length; j++)
{
vertices[offset] = vertexArrays[i][j];
offset++;
}
}
return(vertices);
}
private TextVertex[] GenSingleLineMesh(string text, float xOffset, float yOffset)
{
//init
int vertCount = text.Count(c => font.Characters.ContainsKey(c)) * 6;
TextVertex[] vertices = new TextVertex[vertCount];
float scale = 1f / font.LineHeight;
int spaceWidth = font.PaddingTop + font.PaddingBottom;
int offset = 0;
for (int i = 0; i < text.Length; i++)
{
if (text[i] == '\n' || text[i] == '\r')
{
throw new Exception("How did you even get here???");
}
Character ch;
if (!font.Characters.TryGetValue(text[i], out ch))
{
continue;
}
float xpos = xOffset + ch.Offset.X * scale;
float ypos = yOffset + ch.Offset.Y * scale;
float xmax = xpos + ch.Size.X * scale;
float ymax = ypos + ch.Size.Y * scale;
float xproper = xpos;
float yproper = -ypos + spaceWidth * scale + 0.5f;
float xmaxproper = xmax;
float ymaxproper = -ymax + spaceWidth * scale + 0.5f;
//set vertices
vertices[offset + 0] = new TextVertex(new Vector3(xmaxproper, ymaxproper, 0f), new Vector2(ch.End.X, ch.End.Y));
vertices[offset + 1] = new TextVertex(new Vector3(xmaxproper, yproper, 0f), new Vector2(ch.End.X, ch.Start.Y));
vertices[offset + 2] = new TextVertex(new Vector3(xproper, ymaxproper, 0f), new Vector2(ch.Start.X, ch.End.Y));
vertices[offset + 3] = new TextVertex(new Vector3(xmaxproper, yproper, 0f), new Vector2(ch.End.X, ch.Start.Y));
vertices[offset + 4] = new TextVertex(new Vector3(xproper, yproper, 0f), new Vector2(ch.Start.X, ch.Start.Y));
vertices[offset + 5] = new TextVertex(new Vector3(xproper, ymaxproper, 0f), new Vector2(ch.Start.X, ch.End.Y));
//update offset
offset += 6;
xOffset += ch.Advance * scale;
//kerning
if (i < text.Length - 1)
{
int first = text[i];
int second = text[i + 1];
CharsPair pair = new CharsPair((char)first, (char)second);
if (font.Kernings.TryGetValue(pair, out int amount))
{
xOffset += amount * scale;
}
}
}
return(vertices);
}
