private String registerClip ( Shape clip ) { if ( clip == null ) { this . clipRef = null ; return null ; } // generate the path String pathStr = getSVGPathData ( new Path2D . Double ( clip ) ) ; int index = this . clipPaths . indexOf ( pathStr ) ; if ( index < 0 ) { this . clipPaths . add ( pathStr ) ; index = this . clipPaths . size ( ) - 1 ; } return this . defsKeyPrefix + CLIP_KEY_PREFIX + index ; }
Registers the clip so that we can later write out all the clip definitions in the DEFS element .