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(use-modules (chickadee)
(chickadee math rect)
(chickadee math vector)
(chickadee render)
(chickadee render font)
(chickadee render particles)
(chickadee render texture)
(chickadee scripting)
(ice-9 format)
((sdl2) #:select (sdl-ticks)))
(define particles #f)
(define texture #f)
(define start-time (sdl-ticks))
(define avg-frame-time 0)
(define stats-text "")
(define (load)
(set! *random-state* (random-state-from-platform))
(set! texture (load-image "images/explosion.png"))
(set! particles (make-particles 1000
#:texture texture
#:animation-columns 12
#:speed-range (vec2 1.0 10.0)
#:lifetime 50
#:sort 'young))
(add-particle-emitter particles
(make-particle-emitter (make-rect 320.0 240.0 0.0 0.0)
8))
(script
(forever
(sleep 60)
(set! stats-text (format #f "particles: ~d fps: ~1,2f"
(particles-size particles)
(/ 1000.0 avg-frame-time))))))
(define stats-text-pos (vec2 4.0 464.0))
(define (draw alpha)
(draw-particles particles)
(draw-text stats-text stats-text-pos)
(let ((current-time (sdl-ticks)))
(set! avg-frame-time
(+ (* (- current-time start-time) 0.1)
(* avg-frame-time 0.9)))
(set! start-time current-time)))
(define (update dt)
(update-agenda 1)
(update-particles particles))
(run-game #:load load #:draw draw #:update update)
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