🐛 Fix calculate zoom to avoid bubbles to get outside viewbox (#6138)

* 🐛 Fix calculate zoom to avoid bubbles to get outside vbox

* 📎 PR changes

frontend/src/app/main/data/workspace/viewport.cljs

@@ -10,6 +10,7 @@
    [app.common.data.macros :as dm]
    [app.common.files.helpers :as cfh]
    [app.common.geom.align :as gal]
+   [app.common.geom.point :as gpt]
    [app.common.geom.rect :as gpr]
    [app.common.geom.shapes :as gsh]
    [app.common.math :as mth]
@@ -83,6 +84,25 @@
                 (fn [local]
                   (setup state local)))))))
 
+(defn calculate-centered-viewbox
+  "Updates the viewbox coordinates for a given center position"
+  [local position]
+  (let [vbox (:vbox local)
+        nw   (/ (:width vbox) 2)
+        nh   (/ (:height vbox) 2)
+        nx   (- (:x position) nw)
+        ny   (- (:y position) nh)]
+    (update local :vbox assoc :x nx :y ny)))
+
+(defn update-viewport-position-center
+  [position]
+  (assert (gpt/point? position) "expected a point instance for `position` param")
+
+  (ptk/reify ::update-viewport-position-center
+    ptk/UpdateEvent
+    (update [_ state]
+      (update state :workspace-local calculate-centered-viewbox position))))
+
 (defn update-viewport-position
   [{:keys [x y] :or {x identity y identity}}]
 

frontend/src/app/main/data/workspace/zoom.cljs

@@ -20,7 +20,7 @@
    [beicon.v2.core :as rx]
    [potok.v2.core :as ptk]))
 
-(defn- impl-update-zoom
+(defn impl-update-zoom
   [{:keys [vbox] :as local} center zoom]
   (let [new-zoom (if (fn? zoom) (zoom (:zoom local)) zoom)
         old-zoom (:zoom local)

frontend/src/app/main/ui/comments.cljs

@@ -17,6 +17,7 @@
    [app.main.data.comments :as dcm]
    [app.main.data.modal :as modal]
    [app.main.data.workspace.comments :as dwcm]
+   [app.main.data.workspace.viewport :as dwv]
    [app.main.data.workspace.zoom :as dwz]
    [app.main.refs :as refs]
    [app.main.store :as st]
@@ -1097,15 +1098,35 @@
                                                     groups))
          (group-bubbles zoom remaining visited (cons [current] groups)))))))
 
-(defn- calculate-zoom-scale-to-ungroup-bubbles
-  "Calculate the minimum zoom scale needed for a group of bubbles to avoid overlap among them"
-  [zoom threads]
+(defn- inside-vbox?
+  "Checks if a bubble or a bubble group is inside a viewbox"
+  [thread-group wl]
+  (let [vbox      (:vbox wl)
+        positions (mapv :position thread-group)
+        position  (gpt/center-points positions)
+        pos-x     (:x position)
+        pos-y     (:y position)
+        x1        (:x vbox)
+        y1        (:y vbox)
+        x2        (+ x1 (:width vbox))
+        y2        (+ y1 (:height vbox))]
+    (and (> x2 pos-x x1) (> y2 pos-y y1))))
+
+(defn- calculate-zoom-scale
+  "Calculates the zoom level needed to ungroup the largest number of bubbles while
+   keeping them all visible in the viewbox."
+  [position zoom threads wl]
   (let [num-threads         (count threads)
-        num-grouped-threads (count (group-bubbles zoom threads))
-        zoom-scale-step     1.75]
-    (if (= num-threads num-grouped-threads)
+        grouped-threads     (group-bubbles zoom threads)
+        num-grouped-threads (count grouped-threads)
+        zoom-scale-step     1.75
+        scaled-zoom         (* zoom zoom-scale-step)
+        zoomed-wl           (dwz/impl-update-zoom wl position scaled-zoom)
+        outside-vbox?       (complement inside-vbox?)]
+    (if (or (= num-threads num-grouped-threads)
+            (some #(outside-vbox? % zoomed-wl) grouped-threads))
       zoom
-      (calculate-zoom-scale-to-ungroup-bubbles (* zoom zoom-scale-step) threads))))
+      (calculate-zoom-scale position scaled-zoom threads zoomed-wl))))
 
 (mf/defc comment-floating-group*
   {::mf/wrap [mf/memo]}
@@ -1126,11 +1147,14 @@
 
         on-click
         (mf/use-fn
-         (mf/deps thread-group position)
+         (mf/deps thread-group position zoom)
          (fn []
-           (let [updated-zoom (calculate-zoom-scale-to-ungroup-bubbles zoom thread-group)
+           (let [wl           (deref refs/workspace-local)
+                 centered-wl  (dwv/calculate-centered-viewbox wl position)
+                 updated-zoom (calculate-zoom-scale position zoom thread-group centered-wl)
                  scale-zoom   (/ updated-zoom zoom)]
-             (st/emit! (dwz/set-zoom position scale-zoom)))))]
+             (st/emit! (dwv/update-viewport-position-center position)
+                       (dwz/set-zoom position scale-zoom)))))]
 
     [:div {:style {:top (dm/str pos-y "px")
                    :left (dm/str pos-x "px")}