From d01cc728df8ce7f4774e493f3295c442ac21e0e4 Mon Sep 17 00:00:00 2001
From: Jeremy Dormitzer <jeremydormitzer@lola.com>
Date: Sat, 9 Nov 2019 15:29:18 -0500
Subject: [PATCH] Add mouselook

---
 src/three_playground/core.cljs | 43 +++++++++++++++++++++++++++-------
 1 file changed, 34 insertions(+), 9 deletions(-)

diff --git a/src/three_playground/core.cljs b/src/three_playground/core.cljs
index b416ae6..c42b4af 100644
--- a/src/three_playground/core.cljs
+++ b/src/three_playground/core.cljs
@@ -2,9 +2,12 @@
   (:require
    [goog.dom :as gdom]
    [goog.object :as obj]
-   [oops.core :refer [oset!+]]
+   [oops.core :refer [oset!+ oget+]]
    [three]))
 
+(def mouselook-speed 0.008)
+(def mouselook-max 0.6)
+
 (defn get-app-element []
   (gdom/getElement "app-canvas"))
 
@@ -13,6 +16,13 @@
         material (three/MeshBasicMaterial. #js {:color 0x10ed00})]
     (three/Mesh. geometry material)))
 
+(defn register-entity
+  ([state id entity entity-state]
+   (-> (assoc-in state [:entities id] entity)
+       (assoc-in [:entity-state id] entity-state)))
+  ([state id entity]
+   (assoc-in state [:entities id] entity)))
+
 (defn init-state []
   (let [renderer (three/WebGLRenderer. #js {:canvas (get-app-element)})
         scene (three/Scene.)
@@ -25,16 +35,31 @@
         cube (make-cube)]
     (.setSize renderer (.-innerWidth js/window) (.-innerHeight js/window))
     (.add scene cube)
-    (atom {:running true
-           :renderer renderer
-           :entity-state {:cube {:rotation {:x 0 :y 0}}
-                          :camera {:position {:z 5}}}
-           :entities {:scene scene
-                      :cube cube
-                      :camera camera}})))
+    (atom (-> {:running true
+               :renderer renderer}
+              (register-entity :cube cube {:rotation {:x 0 :y 0}})
+              (register-entity :scene scene)
+              (register-entity :camera camera {:position {:x 0 :y 0 :z 5}
+                                               :rotation {:x 0 :y 0 :z 0}})))))
 
 (defonce app-state (init-state))
 
+;; TODO come up with a more elegant event listener system that fits into the rest of the architecture
+
+(.addEventListener
+ (get-app-element)
+ "mousemove"
+ (fn [event]
+   (swap! app-state #(assoc-in % [:entity-state :camera :rotation :x]
+                               (- (get-in % [:entity-state :camera :rotation :x])
+                                  (min mouselook-max
+                                       (* (.-movementY event) mouselook-speed)))))
+   (swap! app-state #(assoc-in % [:entity-state :camera :rotation :y]
+                               (- (get-in % [:entity-state :camera :rotation :y])
+                                  (min mouselook-max
+                                       (* (.-movementX event) mouselook-speed)))))))
+
+
 (defn update-state [state]
   (-> state
       (assoc-in [:entity-state :cube :rotation :x]
@@ -62,7 +87,7 @@
       (when target-state
         (doseq [path (map->paths target-state)]
           (let [str-path (map name path)
-                current (apply aget entity str-path)
+                current (oget+ entity str-path)
                 new (get-in target-state path)]
             (when-not (= current new)
               (oset!+ entity str-path new))))))))