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Task/Bitmap-Bresenhams-line-algorithm/ERRE/bitmap-bresenhams-line-algorithm.erre

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+PROGRAM BRESENHAM
+
+!$INCLUDE="PC.LIB"
+
+PROCEDURE BRESENHAM
+! === Draw a line using graphic coordinates
+! Inputs are X1, Y1, X2, Y2: Destroys value of X1, Y1
+dx=ABS(x2-x1) sx=-1
+IF x1<x2 THEN sx=1
+dy=ABS(y2-y1) sy=-1
+IF y1<y2 THEN sy=1
+er=-dy
+IF dx>dy THEN er=dx
+er=INT(er/2)
+LOOP
+   PSET(x1,y1,1)
+   EXIT IF x1=x2 AND y1=y2
+   e2=er
+   IF e2>-dx THEN er=er-dy x1=x1+sx
+   IF e2<dy THEN er=er+dx y1=y1+sy
+END LOOP
+END PROCEDURE
+
+BEGIN
+  SCREEN(2)
+  INPUT(x1,y1,x2,y2)
+  BRESENHAM
+  GET(A$)
+  SCREEN(0)
+END PROGRAM