/// <summary>
/// Computes how the font should be moved from baseline left to obey a specified alignment
/// </summary>
private void GetTextAlignDXDY(GFNFont fnt, string txt, double size, TextAlign align, out double dx, out double dy)
{
dx = 0.0;
dy = 0.0;
double w, h;
//y align:
if ((align & TextAlignAtom.TEXT_BOTTOM) != 0)
{
dy = fnt.GetDescent(size);
}
else if ((align & TextAlignAtom.TEXT_CENTER_Y) != 0)
{
dy = -size * 0.5;
}
else if ((align & TextAlignAtom.TEXT_TOP) != 0)
{
dy = -fnt.GetAscent(size);
}
//else align is baseline, dy=0.0
//x align:
if ((align & TextAlignAtom.TEXT_RIGHT) != 0)
{
InternalGetTextSize(fnt, txt, size, out w, out h);
dx = -w;
}
else if ((align & TextAlignAtom.TEXT_CENTER_X) != 0)
{
InternalGetTextSize(fnt, txt, size, out w, out h);
dx = -w * 0.5;
}
//else align is left, dx=0.0 and we're done
}
public virtual void GetFontDim(double size, out double linespace_pixels, out double ascent_pixels, out double descent_pixels, out bool filled)
{
GFNFont fnt = FindFont(Font);
linespace_pixels = fnt.GetLineSpacing(size);
ascent_pixels = fnt.GetAscent(size);
descent_pixels = fnt.GetDescent(size);
filled = fnt.Filled;
}