Report

Report/uml/liang-barsky-clip.puml

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+@startuml
+title Liang-Barsky: отсечение отрезка прямоугольником
+
+start
+:Input segment P0,P1 and clip rect;
+:dx = x1-x0, dy = y1-y0;
+:t0 = 0, t1 = 1;
+
+:Process boundary x >= left\np=-dx, q=x0-left;
+if (clip test fails?) then (yes)
+  stop
+endif
+
+:Process boundary x <= right\np=dx, q=right-x0;
+if (clip test fails?) then (yes)
+  stop
+endif
+
+:Process boundary y >= top\np=-dy, q=y0-top;
+if (clip test fails?) then (yes)
+  stop
+endif
+
+:Process boundary y <= bottom\np=dy, q=bottom-y0;
+if (clip test fails?) then (yes)
+  stop
+endif
+
+:Compute clipped points:\nP0' = P0 + t0*(P1-P0)\nP1' = P0 + t1*(P1-P0);
+:Round to integer pixels;
+:Return accepted clipped segment;
+stop
+
+@enduml