Prolog finding variables -

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% check if 2 squares colide sides col( x, y, s, x2, y2, s2):-     endx x + s, endy y + s,     endx2 x2 + s2, endy2 y2 + s2,     (     ( endx =:= x2, ( (y >= y2, y =< endy2);(endy >= y2, endy =< endy2))); % left-l side     ( x =:= x2, ( (y >= y2, y =< endy2);(endy >= y2, endy =< endy2))); % left-r side     ( endx =:= endx2, ( (y >= y2, y =< endy2);(endy >= y2, endy =< endy2))); % right-l side     ( x =:= endx2, ( (y >= y2, y =< endy2);(endy >= y2, endy =< endy2))); % right-r side         ( endy =:= y2, ( (x >= x2, x =< endx2);(endx >= x2, endx =< endx2))); % top-t side     ( y =:= y2, ( (x >= x2, x =< endx2);(endx >= x2, endx =< endx2))); % top-b side     ( endy =:= endy2, ( (x >= x2, x =< endx2);(endx >= x2, endx =< endx2))); % bottom-t side     ( y =:= endy2, ( (x >= x2, x =< endx2);(endx >= x2, endx =< endx2))) % bottom-b side     ).

it's working when set variables, wanted ask how change use: col( 0,0,3,1,2,s). or col( 0, 0, 3, x,y, s). possible?

i think try library(clpqr):

:- [library(clpr)].  col( x, y, s, x2, y2, s2):- {     endx = x + s, endy = y + s,     endx2 = x2 + s2, endy2 = y2 + s2,     (     ( endx = x2, ( (y >= y2, y =< endy2);(endy >= y2, endy =< endy2))); % left-l side     ( x = x2, ( (y >= y2, y =< endy2);(endy >= y2, endy =< endy2))); % left-r side     ( endx = endx2, ( (y >= y2, y =< endy2);(endy >= y2, endy =< endy2))); % right-l side     ( x = endx2, ( (y >= y2, y =< endy2);(endy >= y2, endy =< endy2))); % right-r side     ( endy = y2, ( (x >= x2, x =< endx2);(endx >= x2, endx =< endx2))); % top-t side     ( y = y2, ( (x >= x2, x =< endx2);(endx >= x2, endx =< endx2))); % top-b side     ( endy = endy2, ( (x >= x2, x =< endx2);(endx >= x2, endx =< endx2))); % bottom-t side     ( y = endy2, ( (x >= x2, x =< endx2);(endx >= x2, endx =< endx2))) % bottom-b side     )                 }.

test:

?- col( 0,0,3,1,2,s). s = 2.0 ; false.

with more variables you're left ranges handle:

?- col( 0, 0, 3, x,y, s). x = 3.0, {y=< -0.0, _g6533>=0.0, s= -y+_g6533, _g6550=3.0-y+_g6533} ; x = 3.0, {y=<3.0, _g8171>=3.0, s= -y+_g8171, _g8188=3.0-y+_g8171} ; x = 0.0, {y=< -0.0, _g10154>=0.0, s= -y+_g10154, _g10171= -y+_g10154} . ...

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