# HG changeset patch
# User Steve Losh <steve@stevelosh.com>
# Date 1462392307 0
# Node ID 6c055494d41d4022eb4a108bcfc3e072aa2bdcf6
# Parent  7e868ce7595b80a1cc3bc9d4f28dd8fe24b0b9ad
Mini 9: Random Distribution

diff -r 7e868ce7595b -r 6c055494d41d package.lisp
--- a/package.lisp	Tue May 03 23:59:09 2016 +0000
+++ b/package.lisp	Wed May 04 20:05:07 2016 +0000
@@ -24,6 +24,7 @@
     #:distance
     #:random-range
     #:random-around
+    #:random-dist
     #:norm
     #:lerp
     #:precise-lerp
diff -r 7e868ce7595b -r 6c055494d41d src/main.lisp
--- a/src/main.lisp	Tue May 03 23:59:09 2016 +0000
+++ b/src/main.lisp	Wed May 04 20:05:07 2016 +0000
@@ -14,43 +14,39 @@
     (circle (particle-x p) (particle-y p) (particle-radius p))))
 
 
+(defun add-result (results)
+  (incf (aref results (floor (random-dist 0 100 4)))))
+
 (defsketch cm (:width *width*
                :height *height*
                :debug :scancode-d)
     ((ready)
      (mouse)
-     (sp)
-     (p)
-     (earth)
-     (sun)
-     (emitter)
-     (ps)
-     (particle-pen (make-pen :stroke (gray 0.5) :fill (gray 0.8)))
-     (sp-pen (make-pen :stroke (gray 0.0) :fill (gray 0.0)))
-     (rope-pen (make-pen :stroke (gray 0.0)))
-     (sun-pen (make-pen :fill (rgb 1.0 1.0 0.0) :stroke (gray 0)))
-     (earth-pen (make-pen :fill (rgb 0.0 1.0 0.0) :stroke (gray 0)))
-     (p-pen (make-pen :fill (rgb 1.0 0.0 0.0)))
+     (graph-pen (make-pen :fill (gray 0.8)))
+     (dot-pen (make-pen :fill (gray 0.8)))
+     (results)
+     (dots)
      )
   (with-fps
     (background (gray 1))
     ;;
     (when ready
 
-      (particle-update! p)
-      (mapcar #'particle-update! ps)
-      (draw-particle sun sun-pen)
-      (draw-particle earth earth-pen)
-      (draw-particle emitter sp-pen)
-      (loop :for p :in ps :do (draw-particle p p-pen))
-
-      (draw-particle p particle-pen)
-      (with-pen rope-pen
-        (line (particle-x p) (particle-y p) (vec-x sp) (vec-y sp))
-        (line (particle-x p) (particle-y p) (vec-x mouse) (vec-y mouse)))
-      (with-pen sp-pen
-        (circle (vec-x sp) (vec-y sp) 3)
-        (circle (vec-x mouse) (vec-y mouse) 3))
+      (with-pen dot-pen
+        (loop :for (x . y) :in dots
+              :do (circle x y 2)))
+      (add-result results)
+      (with-pen graph-pen
+        (loop :for r :across results
+              :for i :from 0
+              :do (rect (map-range 0 100
+                                   0 *width*
+                                   i)
+                        0
+                        (- (/ *width* 100) 1)
+                        (map-range 0 200
+                                   0 *height*
+                                   r))))
 
       )
 
@@ -64,41 +60,12 @@
 
 (defun reset (game)
   (setf (slot-value game 'ready) nil)
-  (setf (slot-value game 'sp)
-        (make-vec (random *width*)
-                  (random *height*))
-        (slot-value game 'p)
-        (make-particle (random *width*)
-                       (random *height*)
-                       :radius 10
-                       :friction (random-range 0.1 0.2)
-                       :gravity (random-range 0.1 0.5))
-        (slot-value game 'sun) (make-particle *center-x* *center-y*
-                                              :mass 500.0
-                                              :radius 20)
-        (slot-value game 'earth) (make-particle 320 80
-                                                :mass 100.0
-                                                :radius 8)
-        (slot-value game 'emitter) (make-particle 100 100 :radius 5)
-        (slot-value game 'ps) nil
-        )
-  (particle-spring-add! (slot-value game 'p)
-                        (slot-value game 'mouse)
-                        0.05
-                        80)
-  (particle-spring-add! (slot-value game 'p)
-                        (slot-value game 'sp)
-                        0.05
-                        80)
-  (loop :repeat 300
-        :for p = (make-particle 100 100
-                                :speed (random 3.0)
-                                :direction (random tau)
-                                :radius 3)
-        :do
-        (push p (slot-value game 'ps))
-        (particle-gravitate-add! p (slot-value game 'sun))
-        (particle-gravitate-add! p (slot-value game 'earth)))
+  (setf (slot-value game 'results)
+        (make-array 100 :initial-element 0)
+        (slot-value game 'dots)
+        (loop :repeat 500
+              :collect (cons (random-dist 0 *width* 4)
+                             (random-dist 0 *height* 4))))
   (setf (slot-value game 'ready) t))
 
 
diff -r 7e868ce7595b -r 6c055494d41d src/math.lisp
--- a/src/math.lisp	Tue May 03 23:59:09 2016 +0000
+++ b/src/math.lisp	Wed May 04 20:05:07 2016 +0000
@@ -21,6 +21,11 @@
   (random-range (- val range)
                 (+ val range)))
 
+(defun random-dist (min max iterations)
+  (loop :repeat iterations
+        :summing (random-range min max) :into total
+        :finally (return (/ total iterations))))
+
 
 ;;;; Number range mapping
 (defun norm (min max val)