public override TextExtents GetExtents(Cairo.Context cr)
{
if (!_extentsDetermined)
{
_extentsDetermined = true;
cr.SetFont(_fontInfo);
_extents = cr.TextExtents(_text);
_extents.Height = _fontInfo.MaxHeight; // always use max height to ensure vertical alignment.
if (_addSpaces > 0)
{
_extents.Width += _addSpaces * _fontInfo.SpaceWidth;
}
else
{
_extents.Width += _extents.XAdvance - _extents.Width;
}
if (_fontInfo.Underline)
{
_extents.Height += _fontInfo.UnderlineHeight + 2.0;
}
_extents.YAdvance = _fontInfo.LineOffset;
}
return(_extents);
}
public override void Draw(Cairo.Context cr, double xPos, double yPos, PrintLayer layer)
{
if (layer == PrintLayer.Text)
{
cr.SetFont(_fontInfo);
yPos -= _extents.YAdvance;
if (_fontInfo.Underline == true)
{
TextExtents extents = GetExtents(cr);
cr.Rectangle(xPos
, yPos - _fontInfo.UnderlineHeight
, extents.Width
, _fontInfo.UnderlineHeight);
cr.Fill();
yPos -= _fontInfo.UnderlineHeight + 2.0;
}
cr.MoveTo(xPos, yPos);
cr.ShowText(_text);
}
}
public void SetExtents(Cairo.Context cr)
{
cr.SetFont(this);
TextExtents extents = cr.TextExtents("Pp");
_maxHeight = extents.Height;
_lineOffset = ((LineSpacing - 1) * extents.Height);
extents = cr.TextExtents("_");
_spaceWidth = extents.Width;
}