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authorDavid Thompson <dthompson2@worcester.edu>2019-07-24 16:41:07 -0400
committerDavid Thompson <dthompson2@worcester.edu>2019-07-24 16:41:07 -0400
commite2ead85d6157299566e9aaaf0437a001aad7a6d9 (patch)
tree2e64563be0013c8d424a8458a0c6829815c13001
parent50d0f6777f6bb131dedb053de2116cc414ef1ae8 (diff)
examples: Update particle example.
-rw-r--r--examples/particles.scm53
1 files changed, 42 insertions, 11 deletions
diff --git a/examples/particles.scm b/examples/particles.scm
index 4fd7ea3..c51f62f 100644
--- a/examples/particles.scm
+++ b/examples/particles.scm
@@ -2,31 +2,49 @@
(chickadee math rect)
(chickadee math vector)
(chickadee render)
+ (chickadee render color)
(chickadee render font)
(chickadee render particles)
+ (chickadee render sprite)
(chickadee render texture)
(chickadee scripting)
(ice-9 format)
((sdl2) #:select (sdl-ticks)))
+(define window-width 800)
+(define window-height 600)
(define particles #f)
-(define texture #f)
+(define emitter #f)
+(define particle-texture #f)
+(define sprite-texture #f)
(define start-time (sdl-ticks))
(define avg-frame-time 0)
(define stats-text "")
+(define (center-x w)
+ (- (/ window-width 2.0) (/ w 2.0)))
+
+(define (center-y h)
+ (- (/ window-height 2.0) (/ h 2.0)))
+
(define (load)
(set! *random-state* (random-state-from-platform))
- (set! texture (load-image "images/explosion.png"))
- (set! particles (make-particles 1000
- #:texture texture
+ (set! particle-texture (load-image "images/explosion.png"))
+ (set! sprite-texture (load-image "images/chickadee.png"))
+ (set! particles (make-particles 2000
+ #:texture particle-texture
+ #:end-color (make-color 1.0 1.0 1.0 0.8)
+ #:end-color (make-color 1.0 1.0 1.0 0.0)
+ #:speed-range (vec2 1.0 5.0)
+ ;;#:acceleration-range (vec2 -0.1 -0.2)
+ #:lifetime 40
#: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))
+ (set! emitter (make-particle-emitter (make-rect (center-x 0.0)
+ (center-y 0.0)
+ 0.0 0.0)
+ 8))
+ (add-particle-emitter particles emitter)
(script
(forever
(sleep 60)
@@ -34,9 +52,11 @@
(particles-size particles)
(/ 1000.0 avg-frame-time))))))
-(define stats-text-pos (vec2 4.0 464.0))
+(define stats-text-pos (vec2 4.0 (- window-height 16.0)))
+(define sprite-position (vec2 (center-x 128.0) (center-y 128.0)))
(define (draw alpha)
(draw-particles particles)
+ (draw-sprite sprite-texture sprite-position)
(draw-text stats-text stats-text-pos)
(let ((current-time (sdl-ticks)))
(set! avg-frame-time
@@ -48,4 +68,15 @@
(update-agenda 1)
(update-particles particles))
-(run-game #:load load #:draw draw #:update update)
+(define (mouse-move x y dx dy buttons)
+ (let ((area (particle-emitter-spawn-area emitter)))
+ (set-rect-x! area x)
+ (set-rect-y! area y)
+ (set-vec2! sprite-position (- x 64.0) (- y 64.0))))
+
+(run-game #:load load
+ #:draw draw
+ #:update update
+ #:mouse-move mouse-move
+ #:window-width window-width
+ #:window-height window-height)