Gets the distance from bottom edge of the black box to the bottom end of the advance vector for the glyphs represented by the GlyphTypeface object.
Assembly: PresentationCore (in PresentationCore.dll)
The value is positive when the bottom edge of the black box is within the alignment rectangle defined by the advance width and font cell height. The font cell height is a horizontal dimension in vertical layout.
The value is negative when the bottom edge of the black box overhangs the alignment rectangle.