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Wind first pass

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This commit is contained in:
Dane Johnson 2023-11-26 13:15:24 -06:00
parent 572726df7c
commit c14bcecccc
3 changed files with 27 additions and 13 deletions
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4
scratches/bootstrap.clj
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@ -8,12 +8,10 @@
(def revenge (ref {:position [0. 0.] (def revenge (ref {:position [0. 0.]
:name "Revenge" :name "Revenge"
:heading (normalize [1.0 1.0]) :heading (normalize [0. 1.0])
:slots [{:type :downwind-sail :length 2 :furl 1.0}] :slots [{:type :downwind-sail :length 2 :furl 1.0}]
:velocity [1. 0.]})) :velocity [1. 0.]}))
(reset! ships [virginia-woolfe revenge]) (reset! ships [virginia-woolfe revenge])
(show-ui) (show-ui)
@tracked-ship

22
src/age_of_sail/core.clj
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@ -4,8 +4,19 @@
[seesaw.core :refer :all] [seesaw.core :refer :all]
[seesaw.bind :as b]) [seesaw.bind :as b])
(:import com.formdev.flatlaf.FlatDarculaLaf)) (:import com.formdev.flatlaf.FlatDarculaLaf))
;; Wind
(def hardcoded-wind [0.1 3.0]) ;; A strong easternly wind! (def hardcoded-winds '({:strength [0.1 3.0] :position [0. 0.]})) ;; A strong easternly wind!
(defn sum-wind
"Wind at x is the sum of each wind force divided by its distance away"
[x winds]
(reduce (fn [sum wind]
(let [dist (len (sub x (:position wind)))]
(if (> dist 1.0)
(add sum (scale (:strength wind) (/ (len (sub x (:position wind))))))
(add sum (:strength wind)))))
(zero)
winds))
;; Ships
(defonce ships (atom [])) (defonce ships (atom []))
(defn ship-names (defn ship-names
@ -35,19 +46,20 @@
force))) force)))
(defn physics-step (defn physics-step
[ship wind] [ship winds]
(dosync (dosync
(let [wind (sum-wind (:position @ship) winds)]
;; Update position ;; Update position
(alter ship update :position add (scale (:velocity @ship) (/ tickrate))) (alter ship update :position add (scale (:velocity @ship) (/ tickrate)))
;; linear dampening ;; linear dampening
(alter ship update :velocity scale (- 1.0 (/ 0.5 tickrate))) (alter ship update :velocity scale (- 1.0 (/ 0.5 tickrate)))
;; wind force ;; wind force
(alter ship update :velocity add (scale (downwind-sails-force @ship wind) (/ tickrate))))) (alter ship update :velocity add (scale (downwind-sails-force @ship wind) (/ tickrate))))))
(defn tick (defn tick
[ships] [ships]
(doseq [ship ships] (doseq [ship ships]
(-> ship (physics-step hardcoded-wind)))) (-> ship (physics-step hardcoded-winds))))
(subscribe! #(tick @ships)) (subscribe! #(tick @ships))

4
src/age_of_sail/vec2.clj
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@ -9,6 +9,10 @@
[v1 v2] [v1 v2]
(mapv + v1 v2)) (mapv + v1 v2))
(defn sub
[v1 v2]
(mapv - v1 v2))
(defn scale (defn scale
[v & scalars] [v & scalars]
(mapv #(* (apply * scalars) %) v)) (mapv #(* (apply * scalars) %) v))