Also test the derivation variant of astar
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@ -4,8 +4,6 @@ USING: arrays assocs astar combinators hashtables kernel literals math math.func
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math.vectors sequences sorting splitting strings tools.test ;
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IN: astar.tests
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<<
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! Use a 10x9 maze (see below) to try to go from s to e, f or g.
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! X means that a position is unreachable.
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! The costs model is:
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@ -13,6 +11,10 @@ IN: astar.tests
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! - going down costs 1 point
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! - going left or right costs 2 points
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<<
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TUPLE: maze < astar ;
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: reachable? ( pos -- ? )
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first2 [ 2 * 5 + ] [ 2 + ] bi* $[
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" 0 1 2 3 4 5 6 7 8 9
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@ -28,20 +30,21 @@ IN: astar.tests
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8 X X X X X X X X X X"
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"\n" split ] nth nth CHAR: X = not ;
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: neighbours ( pos -- neighbours )
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first2
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{ [ 1 + 2array ] [ 1 - 2array ] [ [ 1 + ] dip 2array ] [ [ 1 - ] dip 2array ] } 2cleave
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4array
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[ reachable? ] filter ;
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M: maze neighbours
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drop
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first2
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{ [ 1 + 2array ] [ 1 - 2array ] [ [ 1 + ] dip 2array ] [ [ 1 - ] dip 2array ] } 2cleave
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4array
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[ reachable? ] filter ;
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: heuristic ( from to -- cost )
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v- [ abs ] [ + ] map-reduce ;
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M: maze heuristic
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drop v- [ abs ] [ + ] map-reduce ;
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: cost ( from to -- cost )
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2dup [ first ] bi@ = [ [ second ] bi@ > 1 5 ? ] [ 2drop 2 ] if ;
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M: maze cost
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drop 2dup [ first ] bi@ = [ [ second ] bi@ > 1 5 ? ] [ 2drop 2 ] if ;
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: test1 ( to -- path considered )
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{ 1 1 } swap [ neighbours ] [ cost ] [ heuristic ] <astar> [ find-path ] [ considered ] bi ;
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{ 1 1 } swap maze new [ find-path ] [ considered ] bi ;
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>>
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! Existing path from s to f
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@ -73,8 +76,6 @@ IN: astar.tests
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! Non-existing path from s to g -- all positions must have been considered
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[ f 26 ] [ { 1 7 } test1 length ] unit-test
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<<
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! Look for a path between A and C. The best path is A --> D --> C. C will be placed
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! in the open set early because B will be examined first. This checks that the evaluation
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! of C is correctly replaced in the open set.
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@ -92,6 +93,10 @@ IN: astar.tests
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! A ---> D ---------> E ---> F
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! (2) (1) (1)
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<<
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! In this version, we will use the quotations-aware version through <astar>.
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: n ( pos -- neighbours )
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$[ { "ABD" "BC" "C" "DCE" "ECF" } [ unclip swap 2array ] map >hashtable ] at ;
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