question: @ Override public void initForRendering ( UnifiedImageBuilder imageBdr , CoordTransformer transformer , WayNodeProvider wnProvider ) { super . initForRendering ( imageBdr , transformer , wnProvider ) ; wayNodeHash . clear ( ) ; scale = transformer . computeScale ( ) ; displayFactorSym = displayFactor * transformer . getDotsPerUnit ( ) ; imageBdr . setFontSize ( defaultFontSize * displayFactorSym ) ; areaBuffer . clear ( ) ; wayBuffer . clear ( ) ; nodeBuffer . clear ( ) ; trackBuffer . clear ( ) ; nameInfoBuffer . clear ( ) ; }
target:  Clears all buffers and prepares rendering. 