ocr: Trail edge polygon M. X=100 Lead edge polygon R. Xu110 Lead edge polygon S, X=111 Active polygon list Current edge, since itsa: taiang edgo, remove polygon MI from the acte polygon list. Head of APL Polygon M became nearest at X=18 Remove polygon M from the APL PoygonMi 19 on top ot the APL, meaning its.currentty visiblo (tho nearesti porygon as we: reachi this pixel), sowe: emit.a span: siarting at Polygon. J the coordinate at which polygon M became visible: (=18), and ending at the current ccordinatel (X2100). Mark thal polygon J became visible at X=100. Ifp polygont M had. not been on top. ...
