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Interface for a font.
Copyright (C) Jean-Sebastien Goupil http://www.barcodephp.com
getText()
setText( $text)
getRotationAngle()
setRotationAngle( $rotationDegree)
getBackgroundColor()
setBackgroundColor( $backgroundColor)
getForegroundColor()
setForegroundColor( $foregroundColor)
getDimension()
draw( $im, $x, $y)