From dbd3931769feb84c86dc6c18eedac91816673edf Mon Sep 17 00:00:00 2001
From: Juan Facorro <juan.facorro@klarna.com>
Date: Thu, 29 Nov 2018 22:43:16 +0100
Subject: [PATCH] [#15] Use looping control functions in mandelbrot example

---
 src/doodler/core.clje                |  3 ++-
 src/doodler/examples/mandelbrot.clje | 29 ++++++++++++++++++++--------
 src/doodler/sketch.clje              | 11 +++++++----
 3 files changed, 30 insertions(+), 13 deletions(-)

diff --git a/src/doodler/core.clje b/src/doodler/core.clje
index b23af93..f86bfca 100644
--- a/src/doodler/core.clje
+++ b/src/doodler/core.clje
@@ -180,7 +180,8 @@
 
 (defn start-loop
   []
-  (u/swap-var! *sketch* assoc :looping? true))
+  (u/swap-var! *sketch* assoc :looping? true)
+  (u/send-message (:pid *sketch*) :refresh))
 
 (defmacro defsketch
   [name & opts]
diff --git a/src/doodler/examples/mandelbrot.clje b/src/doodler/examples/mandelbrot.clje
index a331ab1..13dd5a8 100644
--- a/src/doodler/examples/mandelbrot.clje
+++ b/src/doodler/examples/mandelbrot.clje
@@ -15,12 +15,12 @@
         minx -2.5
         miny -2.0
         wh 4.0]
-    [(+ minx (* wh (/ x w)))
-     (+ miny (* wh (/ y h)))]))
+    #erl[(+ minx (* wh (/ x w)))
+         (+ miny (* wh (/ y h)))]))
 
 (defn ->color
   [n max-iters]
-  (int (* 255 (/ n max-iters))))
+  (erlang/div (* 255 n) max-iters))
 
 (defn mandelbrot [x y max-iters]
   (loop [a 0.0
@@ -35,10 +35,19 @@
              (inc n)))))
 
 (defn mandelbrot-point [x y w h max-iters]
-  (let [[i j]     (->complex x y w h)
-        n         (mandelbrot i j max-iters)
-        color     (->color n max-iters)]
-    [x y color]))
+  (let* [#erl[i j] (->complex x y w h)
+         n         (mandelbrot i j max-iters)
+         color     (->color n max-iters)]
+    #erl[x y color]))
+
+(defn on-mouse-pressed [state handler]
+  (if-not (d/looping?)
+    (do
+      (d/start-loop)
+      (d/background 0)
+      {:points (points)
+       :m-points nil})
+    state))
 
 (defn setup
   []
@@ -48,7 +57,10 @@
 
 (defn update-state
   [{points :points :as state}]
-  (when points
+  (if-not points
+    (do
+      (d/no-loop)
+      state)
     (let [max-iters 100
           w         (d/width)
           h         (d/height)]
@@ -73,6 +85,7 @@
   :size [300 300]
   :setup setup
   :update update-state
+  :mouse-pressed on-mouse-pressed
   :draw draw
   :bgcolor [0]
   :features [:keep-on-top]
diff --git a/src/doodler/sketch.clje b/src/doodler/sketch.clje
index 943fb84..81d4be9 100644
--- a/src/doodler/sketch.clje
+++ b/src/doodler/sketch.clje
@@ -226,6 +226,7 @@
             :frame-delay frame-period
             :current-frame-rate default-frame-rate
 
+            :looping? true
             :frame-count 0
             :epoch (u/time-mark)
             :p-time-mark (u/time-mark)
@@ -280,10 +281,12 @@
        refresh
        u/noreply))
   ([#erl[:draw time-mark] sketch]
-   (-> sketch
-       (on-draw (:draw-fn sketch))
-       (next-refresh time-mark)
-       u/noreply))
+   (u/noreply
+    (if (:looping? sketch)
+      (-> sketch
+          (on-draw (:draw-fn sketch))
+          (next-refresh time-mark))
+      sketch)))
   ([wx sketch]
    (u/noreply sketch)))