public void DrawText(string text, GLFont font, float startX, float startY, GLBrush brush, float width = 1000)
{
if (string.IsNullOrEmpty(text))
{
return;
}
GL.Enable(EnableCap.Texture2D);
GL.BindTexture(TextureTarget.Texture2D, font.Texture);
GL.Color4(brush.Color0.R, brush.Color0.G, brush.Color0.B, (byte)255);
GL.Begin(BeginMode.Quads);
int alignmentOffsetX = 0;
if (font.Alignment != 0)
{
font.MeasureString(text, out int minX, out int maxX);
if (font.Alignment == 1)
{
alignmentOffsetX -= minX;
alignmentOffsetX += ((int)width - maxX - minX) / 2;
}
else
{
alignmentOffsetX -= minX;
alignmentOffsetX += ((int)width - maxX - minX);
}
}
int x = (int)(startX + alignmentOffsetX);
int y = (int)(startY + font.OffsetY);
for (int i = 0; i < text.Length; i++)
{
var c0 = text[i];
var info = font.GetCharInfo(c0);
int x0 = x + info.xoffset;
int y0 = y + info.yoffset;
int x1 = x0 + info.width;
int y1 = y0 + info.height;
GL.TexCoord2(info.u0, info.v0); GL.Vertex2(x0, y0);
GL.TexCoord2(info.u1, info.v0); GL.Vertex2(x1, y0);
GL.TexCoord2(info.u1, info.v1); GL.Vertex2(x1, y1);
GL.TexCoord2(info.u0, info.v1); GL.Vertex2(x0, y1);
x += info.xadvance;
if (i != text.Length - 1)
{
char c1 = text[i + 1];
x += font.GetKerning(c0, c1);
}
}
GL.End();
GL.Disable(EnableCap.Texture2D);
}
public float MeasureString(string text, GLFont font)
{
font.MeasureString(text, out int minX, out int maxX);
return(maxX - minX);
}
