This is the setter of Size :
set
{
if ( value != _size )
{
Remake( _scaledSize / _size * value, _size, ref _scaledSize,
ref _font );
_size = value;
}
}
//...
/// <summary>
/// Recreate the font based on a new scaled size. The font
/// will only be recreated if the scaled size has changed by
/// at least 0.1 points.
/// </summary>
/// <param name="scaleFactor">
/// The scaling factor to be used for rendering objects. This is calculated and
/// passed down by the parent <see cref="GraphPane"/> object using the
/// <see cref="PaneBase.CalcScaleFactor"/> method, and is used to proportionally adjust
/// font sizes, etc. according to the actual size of the graph.
/// </param>
/// <param name="size">The unscaled size of the font, in points</param>
/// <param name="scaledSize">The scaled size of the font, in points</param>
/// <param name="font">A reference to the <see cref="Font"/> object</param>
private void Remake( float scaleFactor, float size, ref float scaledSize, ref Font font )
{
float newSize = size * scaleFactor;
float oldSize = ( font == null ) ? 0.0f : font.Size;
// Regenerate the font only if the size has changed significantly
if ( font == null ||
Math.Abs( newSize - oldSize ) > 0.1 ||
font.Name != this.Family ||
font.Bold != _isBold ||
font.Italic != _isItalic ||
font.Underline != _isUnderline )
{
FontStyle style = FontStyle.Regular;
style = ( _isBold ? FontStyle.Bold : style ) |
( _isItalic ? FontStyle.Italic : style ) |
( _isUnderline ? FontStyle.Underline : style );
scaledSize = size * (float)scaleFactor;
font = new Font( _family, scaledSize, style, GraphicsUnit.World );
}
}
The interesting lines are:
scaledSize = size * (float)scaleFactor;
font = new Font( _family, scaledSize, style, GraphicsUnit.World );
Which means that your size is scaled using PaneBase.CalcScaleFactor. You should take a look at this last one
