Report

Report/uml/polyline-fill-algorithm.puml

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+@startuml
+title Ломаная + заливка: 3-фазный алгоритм
+
+start
+:Input points[], closed, filled;
+if (points < 2?) then (yes)
+  stop
+endif
+
+:Create temporary buffer + copy context;
+if (closed and filled?) then (yes)
+  :Enable FillCanvas (startFill);
+endif
+
+:Draw all segments Pi->Pi+1;
+if (closed?) then (yes)
+  :Draw segment Pn->P0;
+endif
+
+if (fill enabled?) then (yes)
+  :Phase 1:\nBorder pixels already collected in hash-set;
+  :Phase 2:\nSort border keys by (y,x),\nfind row segments,\nchoose interior seeds;
+  :Phase 3:\nStack flood fill (4-neighbors),\nskip border/visited,\npaint fill color;
+endif
+
+:Composite temporary buffer to target once;
+stop
+
+@enduml