From d739f7531677bafaf8ca5deae193e25d54e6777f Mon Sep 17 00:00:00 2001
From: Jeremy Dormitzer <jeremy.dormitzer@gmail.com>
Date: Tue, 8 Mar 2022 12:26:33 -0500
Subject: [PATCH] [WIP] Begin implementing drawing the tree

---
 cljs/jeremy_website/sketches/tree.cljs | 119 ++++++-------------------
 1 file changed, 27 insertions(+), 92 deletions(-)

diff --git a/cljs/jeremy_website/sketches/tree.cljs b/cljs/jeremy_website/sketches/tree.cljs
index ffd0e20..d361201 100644
--- a/cljs/jeremy_website/sketches/tree.cljs
+++ b/cljs/jeremy_website/sketches/tree.cljs
@@ -8,7 +8,7 @@
 
 ;; The tree branch object
 ;; A branch has a coordinate, a list of segments and a map of child branches
-;; A segment has an angle and a length
+;; A segment has an x1, y1, x2, y2
 ;; The child branch map's keys are the segment index at which the
 ;; child branch originates, and the values are the child branch itself
 (defn l-system-tree
@@ -61,49 +61,6 @@
                        :children {}}
                       0))))
 
-(defn l-system-lines
-  [{:keys [segment-length initial-angle initial-x initial-y l-system]}]
-  (vec
-   (:lines
-    (reduce
-     (fn [{:keys [x y angle angle-stack position-stack depth lines] :as state}
-          symbol]
-       (condp = symbol
-         "F" (let [new-x (+ x (* segment-length
-                                 (js/Math.cos (degrees->radians angle))))
-                   new-y (+ y (* (- segment-length)
-                                 (js/Math.sin (degrees->radians angle))))
-                   line {:x1 x :y1 y :x2 new-x :y2 new-y}]
-               (assoc state
-                      :x new-x
-                      :y new-y
-                      :lines (conj lines (assoc line :depth depth))))
-         "+" (assoc state :angle (+ angle 25))
-         "-" (assoc state :angle (- angle 25))
-         "*" (assoc state :angle (+ angle 20))
-         "/" (assoc state :angle (- angle 20))
-         ">" (assoc state :angle (+ angle 15))
-         "<" (assoc state :angle (- angle 15))
-         "[" (assoc state
-                    :angle-stack (conj angle-stack angle)
-                    :position-stack (conj position-stack [x y])
-                    :depth (inc depth))
-         "]" (assoc state
-                    :angle (peek angle-stack)
-                    :angle-stack (pop angle-stack)
-                    :x (first (peek position-stack))
-                    :y (second (peek position-stack))
-                    :position-stack (pop position-stack)
-                    :depth (dec depth))
-         state))
-     {:angle initial-angle
-      :angle-stack [initial-angle]
-      :x initial-x
-      :y initial-y
-      :position-stack [[initial-x initial-y]]
-      :depth 0
-      :lines []}
-     (:state l-system)))))
 
 (defn setup []
   ;; Hue goes from 0-360, saturation/brightness from 0-100
@@ -124,59 +81,37 @@
                              :segment-length 6
                              :initial-x (* (q/width) 0.1)
                              :initial-y (* (q/height) 0.95)
-                             :l-system l-system})
-        ;; lines (l-system-lines {:initial-angle (- 90 25)
-        ;;                        :segment-length 6
-        ;;                        :initial-x (* (q/width) 0.1)
-        ;;                        :initial-y (* (q/height) 0.95)
-        ;;                        :l-system l-system})
-        ]
+                             :l-system l-system})]
     {:tree tree
-     ;; :to-draw lines
-     ;; :drawing []
-     }))
+     :current-branches [{:branch tree
+                         :i 0}]
+     :drawn-branches []
+     :to-draw []
+     :drawing []
+     :drawn []}))
 
-(defn old-update-state [{:keys [to-draw drawing] :as state}]
-  (let [batch-size 10]
-    (if (> (count to-draw) 0)
-      (assoc state
-             :to-draw (vec (drop batch-size to-draw))
-             :drawing (vec (concat drawing (take batch-size to-draw))))
-      state)))
+(defn update-state [state]
+  (let [drawn (concat (mapcat :segments (:drawn-branches state))
+                      (mapcat #(let [i (:i %)
+                                     segs (get-in % [:branch :segments])]
+                                 (subvec segs i))
+                              (:current-branches state)))]
+    (assoc state
+           :drawn drawn)))
 
-(defn dedupe-lines [lines]
-  (:lines
-   (reduce (fn [{:keys [lines already-seen] :as state} line]
-             (if-not (contains? already-seen ((juxt :x1 :y1 :x2 :y2) line))
-               (assoc state
-                      :already-seen (conj already-seen ((juxt :x1 :y1 :x2 :y2) line))
-                      :lines (conj lines line))
-               state))
-           {:lines []
-            :already-seen #{}}
-           lines)))
+{:drawing [{:x1 10 :y1 15 :x2 20 :y2 25 :lerp 0.4}]
+ :drawn []
+ :to-draw []}
 
-(defn old-draw [{:keys [to-draw drawing]}]
+(defn draw [{:keys [drawing drawn to-draw]}]
   (q/background 0 0 100)
   (q/fill 0 0 0)
-  (let [lines (dedupe-lines drawing)]
-    (doseq [line lines]
-      (q/stroke-weight (- 1.75 (* 0.1 (:depth line))))
-      (q/stroke 240 0 (+ 65 (* 2 (:depth line))))
-      (apply q/line ((juxt :x1 :y1 :x2 :y2) line))))
-  (when (= (count to-draw) 0)
-    (q/no-loop)))
-
-(defn draw [{:keys [tree]}]
-  (q/background 0 0 100)
-  (let [draw-tree
-        (fn draw-tree [branch]
-          (doseq [segment (:segments branch)]
-            (q/line (:x1 segment) (:y1 segment) (:x2 segment) (:y2 segment)))
-          (doseq [child (vals (:children branch))]
-            (draw-tree child)))]
-    (draw-tree tree)
-    (q/no-loop)))
+  (doseq [{:keys [x1 y1 x2 y2]} drawn]
+    (q/line x1 y1 x2 y2))
+  (doseq [{:keys [x1 y1 x2 y2 lerp]} drawing]
+    (let [x2 (q/lerp x1 x2 lerp)
+          y2 (q/lerp y1 y2 lerp)]
+      (q/line x1 y1 x2 y2))))
 
 (defn sketch
   [{:keys [host size]}]
@@ -185,5 +120,5 @@
    :middleware [m/fun-mode]
    :size size
    :setup setup
-   ;; :update update-state
+   :update update-state
    :draw draw))