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Length: 949 (0x3b5)
Types: TextFile
Names: »c_curve«
└─⟦a0efdde77⟧ Bits:30001252 EUUGD11 Tape, 1987 Spring Conference Helsinki
└─⟦this⟧ »EUUGD11/euug-87hel/sec1/gprolog/demo/c_curve«
/* C curve */
init :- #def(basic,BASIC), #def(noinput,NOINPUT), #def(twod,TWOD),
#initialize_core(BASIC,NOINPUT,TWOD),
#def(false,FALSE),
#initialize_view_surface(pixwindd,FALSE),
#select_view_surface(pixwindd),
#set_viewport_2(0.125,0.875,0.125,0.75),
#set_window(-80.0,80.0,-50.0,80.0).
demo :- #create_temporary_segment,
#move_abs_2(10.0,10.0),
c_curve(50.0,0.4),
#close_temporary_segment,
label("C-Curve").
label(Label) :- #create_temporary_segment,
#move_abs_2(20.0,-20.0),
#text(Label),
#close_temporary_segment.
label(X) :- fail.
c_curve(Length,Angle) :- Length < 3.0, !, plotline(Length,Angle).
c_curve(Length,Angle) :- #def(pi,PI), L is Length / (PI / 2),
A1 is Angle + PI / 4.0,
A2 is Angle - PI / 4.0,
c_curve(L,A1),
c_curve(L,A2).
plotline(Length,Angle) :- X is Length * cos(Angle),
Y is Length * sin(Angle),
#line_rel_2(X,Y).
done :- #deselect_view_surface(pixwindd),
#terminate_core.