93 lines
3.2 KiB
Racket
93 lines
3.2 KiB
Racket
#lang racket
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(provide (all-defined-out)) ; for testing module
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(require racket/draw)
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; a Grid is a list of lines. All lines in a grid must be specified as moving left to right, top to bottom ("to" coordinate higher than "from" coordinate")
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; represents a point in 2d space.
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(struct point (x y) #:transparent)
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; represents a line drawn from one point to another and which player drew it.
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(struct line (from to player) #:transparent)
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; width and height of the playing grid.
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(define GRID-WIDTH 6)
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(define GRID-HEIGHT 6)
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; size of one grid position in pixels
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(define GRID-SCALE 16)
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; image representing the empty grid
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(define EMPTY-GRID
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(let* [[bitmap (make-bitmap (* GRID-WIDTH GRID-SCALE) (* GRID-HEIGHT GRID-SCALE))]
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[dc (new bitmap-dc% [bitmap bitmap])]]
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(send dc set-brush "black" 'solid)
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(for ([x (in-range GRID-WIDTH)])
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(for ([y (in-range GRID-HEIGHT)])
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(send dc draw-ellipse (* x GRID-SCALE) (* y GRID-SCALE) (/ GRID-SCALE 2) (/ GRID-SCALE 2))))
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bitmap))
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; Line Line -> Bool
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; tests if two lines are in the same position
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(define (same-position? l1 l2)
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(or
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(and
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(equal? (line-from l1) (line-from l2))
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(equal? (line-to l1) (line-to l2)))
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(and
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(equal? (line-to l1) (line-from l2))
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(equal? (line-from l1) (line-to l2)))))
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; Line -> Bool
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; returns #t if the line is forwards (with forwards being moving right and down, higher end coord than start)
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(define (forwards? line)
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(and
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(>= (point-x (line-to line)) (point-x (line-from line)))
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(>= (point-y (line-to line)) (point-y (line-from line)))))
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; Line -> Bool
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; returns #t if a line is valid in terms of length (only moving one point in one direction)
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(define (valid-length? line)
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(= 1
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(+ (abs (- (point-x (line-from line)) (point-x (line-to line))))
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(abs (- (point-y (line-from line)) (point-y (line-to line)))))))
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; Point -> Bool
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; returns #t if a point is out of bounds (off the edge of the grid)
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(define (out-of-bounds? p)
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(or
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(> 0 (point-x p))
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(> 0 (point-y p))
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(< (- GRID-WIDTH 1) (point-x p))
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(< (- GRID-WIDTH 1) (point-y p))))
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; Line Grid -> Bool
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; returns #t if adding the given move to the grid is valid.
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(define (valid-move? line grid)
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(and
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(empty? (filter (lambda (l) (same-position? l line)) grid)) ; line doesn't already exist on board
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(valid-length? line)
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(forwards? line)
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(and
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(not (out-of-bounds? (line-from line)))
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(not (out-of-bounds? (line-to line))))))
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; Grid -> Image
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; renders grid to an image for showing humans the game.
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(define (render-grid grid)
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(let* [[bitmap (make-bitmap (* GRID-WIDTH GRID-SCALE) (* GRID-HEIGHT GRID-SCALE))]
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[dc (new bitmap-dc% [bitmap bitmap])]]
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(for ([l grid])
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(cond
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[(= (line-player l) 0) (send dc set-pen "red" 4 'solid)] ; player 1 draws in red
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[(= (line-player l) 1) (send dc set-pen "blue" 4 'solid)]) ; player 2 draws in blue
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(send dc draw-line
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(+ 4 (* GRID-SCALE (point-x (line-from l))))
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(+ 4 (* GRID-SCALE (point-y (line-from l))))
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(+ 4 (* GRID-SCALE (point-x (line-to l))))
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(+ 4 (* GRID-SCALE (point-y (line-to l)))))) ; draw the line
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(send dc draw-bitmap EMPTY-GRID 0 0) ; overlay dot grid
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bitmap)) |