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-rw-r--r--examples/path.scm80
1 files changed, 80 insertions, 0 deletions
diff --git a/examples/path.scm b/examples/path.scm
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+(use-modules (chickadee)
+ (chickadee graphics color)
+ (chickadee graphics font)
+ (chickadee graphics path)
+ (chickadee math)
+ (chickadee math vector)
+ (chickadee scripting))
+
+(set! *random-state* (random-state-from-platform))
+
+(define (stats-message)
+ (format #f "fps: ~1,2f"
+ (/ 1000.0 avg-frame-time)))
+(define start-time 0.0)
+(define avg-frame-time 16)
+(define stats-text (stats-message))
+(define stats-text-pos (vec2 4.0 464.0))
+(define last-update start-time)
+(define canvas (make-empty-canvas))
+(define rss-orange (string->color "#FF8800"))
+
+(define rss-feed-logo
+ (superimpose
+ (with-style ((fill-color rss-orange))
+ (fill
+ (rounded-rectangle (vec2 0.0 3.0) 95.0 95.0 #:radius 15.0)))
+ (with-style ((fill-color white))
+ (fill
+ (circle (vec2 18.0 18.0) 9.0)))
+ (with-style ((stroke-color white)
+ (stroke-cap 'round)
+ (stroke-width 15.0))
+ (stroke
+ (path
+ (arc (vec2 18.0 18.0) 30.0 30.0 0.0 pi/2))
+ (path
+ (arc (vec2 18.0 18.0) 60.0 60.0 0.0 pi/2))))))
+
+(define polylines
+ (with-style ((stroke-color tango-plum)
+ (stroke-width 6.0))
+ (stroke
+ (apply polyline (map (lambda (i)
+ (vec2 (* (+ i 1) 30) (+ (random 240) 100)))
+ (iota 20))))))
+
+(define (make-example-painter s)
+ (superimpose (translate (vec2 30.0 10.0)
+ (scale s rss-feed-logo))
+ polylines))
+
+(define (load)
+ (script
+ (forever
+ (tween 60 1.0 4.0
+ (lambda (s)
+ (set-canvas-painter! canvas (make-example-painter s))))
+ (tween 60 4.0 1.0
+ (lambda (s)
+ (set-canvas-painter! canvas (make-example-painter s)))))))
+
+(define (draw alpha)
+ (draw-canvas canvas)
+ (draw-text stats-text stats-text-pos)
+ (let ((current-time (elapsed-time)))
+ (set! avg-frame-time
+ (+ (* (- current-time start-time) 0.1)
+ (* avg-frame-time 0.9)))
+ (set! start-time current-time)
+ (when (>= (- current-time last-update) 1000)
+ (set! stats-text (stats-message))
+ (set! last-update current-time))))
+
+(define (update dt)
+ (update-agenda 1))
+
+(run-game #:window-title "Vector paths"
+ #:load load
+ #:draw draw
+ #:update update)