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-rw-r--r--examples/grid.scm87
1 files changed, 87 insertions, 0 deletions
diff --git a/examples/grid.scm b/examples/grid.scm
new file mode 100644
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--- /dev/null
+++ b/examples/grid.scm
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+(use-modules (chickadee)
+ (chickadee math grid)
+ (chickadee math vector)
+ (chickadee math rect)
+ (chickadee render)
+ (chickadee render color)
+ (chickadee render font)
+ (chickadee render shapes)
+ (chickadee render sprite)
+ (chickadee sdl)
+ (sdl2 input keyboard))
+
+(define font #f)
+(define grid (make-grid))
+(define item-color (make-color 0.7 0.0 0.0 0.5))
+(define cell-color (make-color 0.0 0.7 0.0 0.2))
+(define player-color (make-color 0.0 0.0 0.7 0.8))
+(define player-pos #v(32.0 32.0))
+(define player-speed 2)
+(define player-velocity #v(0.0 0.0))
+
+(define (load)
+ (set! font (load-font "fonts/good_neighbors_starling.xml"))
+ (grid-add grid 'wall-left 0 0 32 480)
+ (grid-add grid 'wall-top 32 448 576 32)
+ (grid-add grid 'wall-right 608 0 32 480)
+ (grid-add grid 'wall-bottom 32 0 576 32)
+ (grid-add grid 'box-1 100 100 100 50)
+ (grid-add grid 'box-2 300 300 50 100)
+ (grid-add grid 'box-3 350 150 200 75)
+ (grid-add grid 'box-4 150 140 130 75)
+ (grid-add grid 'player (vec2-x player-pos) (vec2-y player-pos) 32 32))
+
+(define (update dt)
+ (set-vec2-x! player-velocity 0.0)
+ (set-vec2-y! player-velocity 0.0)
+ (when (key-pressed? 'up)
+ (set-vec2-y! player-velocity player-speed))
+ (when (key-pressed? 'down)
+ (set-vec2-y! player-velocity (- player-speed)))
+ (when (key-pressed? 'right)
+ (set-vec2-x! player-velocity player-speed))
+ (when (key-pressed? 'left)
+ (set-vec2-x! player-velocity (- player-speed)))
+ (vec2-add! player-pos player-velocity)
+ (grid-move grid 'player player-pos
+ (lambda (a b)
+ (if (eq? a 'player)
+ slide
+ #f))))
+
+(define %cell-rect
+ (make-rect 0.0 0.0 (grid-cell-size grid) (grid-cell-size grid)))
+(define %cell-count-pos
+ #v(0.0 0.0))
+
+(define number->string*
+ (let ((cache (make-hash-table)))
+ (lambda (n)
+ (or (hashv-ref cache n)
+ (begin
+ (let ((s (number->string n)))
+ (hashv-set! cache n s)
+ s))))))
+
+(define (draw alpha)
+ (with-blend-mode 'alpha
+ (let ((size (grid-cell-size grid)))
+ (for-each-cell (lambda (cell x y)
+ (set-rect-x! %cell-rect (* x size))
+ (set-rect-y! %cell-rect (* y size))
+ (draw-filled-rect %cell-rect cell-color))
+ grid)
+ (with-batched-sprites
+ (for-each-cell (lambda (cell x y)
+ (set-vec2-x! %cell-count-pos (+ (* x size) (/ size 2)))
+ (set-vec2-y! %cell-count-pos (+ (* y size) (/ size 2)))
+ (draw-text font (number->string* (cell-count cell))
+ %cell-count-pos))
+ grid)))
+ (for-each-item (lambda (item rect)
+ (if (eq? item 'player)
+ (draw-filled-rect rect player-color)
+ (draw-filled-rect rect item-color)))
+ grid)))
+
+(run-game/sdl #:load load #:draw draw #:update update)