Fully pivot to pirates, some UI

project.clj

@@ -5,7 +5,7 @@
             :url "https://www.eclipse.org/legal/epl-2.0/"}
   :dependencies [[org.clojure/clojure "1.11.1"]
                  [seesaw "1.5.0"]]
-  :main ^:skip-aot space-sim.core
+  :main ^:skip-aot age-of-sail.core
   :target-path "target/%s"
   :profiles {:uberjar {:aot :all
                        :jvm-opts ["-Dclojure.compiler.direct-linking=true"]}})

scratches/bootstrap.clj

@@ -1,6 +1,7 @@
-;; you should be in space-sim.core>
+;; you should be in age-of-sail.core>
 
 (def my-ship (ref {:position [0. 0.]
+                   :name "Virgina Woolfe"
                    :heading (normalize [1.0 1.0])
                    :slots [{:type :downwind-sail :length 2 :furl 1.0}]
                    :velocity [1. 0.]}))
@@ -9,8 +10,7 @@
 
 (start-program)
 @my-ship
-(dosync (alter my-ship assoc :heading (normalize [0. 1.])))
 (stop-program)
 
-
 (show-ui)
+@tracked-ship

src/age_of_sail/core.clj

@@ -1,6 +1,7 @@
-(ns space-sim.core
-  (:require [space-sim.vec2 :refer :all]
+(ns age-of-sail.core
+  (:require [age-of-sail.vec2 :refer :all]
             [seesaw.core :refer :all]
+            [seesaw.bind :as b]
             [clojure.math :as math]))
 
 (def tickrate 100)
@@ -8,6 +9,10 @@
 (defonce ships (atom []))
 (defonce program (atom nil))
 
+(defn find-ship
+  [ships name]
+  (some #(when (= name (:name @%)) %) ships))
+
 (defn downwind-force
   "Calculates the force for a single square downwind sail
   Force = furl × length² × dot(wind, heading)"
@@ -18,13 +23,11 @@
   [ship wind]
   (loop [slots (:slots ship)
          force (zero)]
-    (if (empty? slots)
-      force
-      (let [slot (first slots)
-            tail (rest slots)]
-        (if (= :downwind-sail (:type slot))
-          (recur tail (add force (downwind-force slot wind (:heading ship))))
-          (recur tail force))))))
+    (if-let [slot (first slots)]
+      (if (= :downwind-sail (:type slot))
+        (recur (rest slots) (add force (downwind-force slot wind (:heading ship))))
+        (recur (rest slots) force))
+      force)))
 
 (defn physics-step
   [ship wind]
@@ -50,21 +53,29 @@
   []
   (stop-program)
   (let [thread-continue (atom true)]
-    (.start (Thread. (fn []
-                       (while @thread-continue
-                         (tick @ships)
-                         (Thread/sleep (quot 1000 tickrate))))))
+    (.start
+     (Thread.
+      (fn []
+        (while @thread-continue
+          (tick @ships)
+          (Thread/sleep (quot 1000 tickrate))))))
     (reset! program thread-continue)))
 
 ;; UI
+(def tracked-ship (atom nil))
+
 (defn ship-chooser
   []
-  (let [namebox (text)]
-    (flow-panel :items ["Ship Name" namebox])
-    (listen namebox :key-typed #())))
+  (let [name (text :columns 20)]
+    (b/bind (.getDocument name) (b/transform #(find-ship @ships %)) tracked-ship)
+    (flow-panel :items ["Ship Name" name])))
+
+(defn ship-info
+  [])
+
 (defn show-ui
   []
-  (-> (frame :title "Space Sim") pack! show!))
+  (-> (frame :title "Space Sim" :content (ship-chooser)) pack! show!))
 
 (defn -main
   [args]

src/age_of_sail/vec2.clj

@@ -1,4 +1,4 @@
-(ns space-sim.vec2
+(ns age-of-sail.vec2
   (:require [clojure.math :as math]))
 
 (defn zero