✨ Snap for moving path nodes and handlers

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

@@ -24,8 +24,8 @@
 (d/export edition/start-path-edit)
 
 ;; Selection
-(d/export selection/select-handler)
 (d/export selection/handle-selection)
+(d/export selection/select-node)
 (d/export selection/path-handler-enter)
 (d/export selection/path-handler-leave)
 (d/export selection/path-pointer-enter)

frontend/src/app/main/data/workspace/path/edition.cljs

@@ -35,17 +35,20 @@
                        :x dx :y dy :c2x dx :c2y dy))))))
 
 (defn modify-handler [id index prefix dx dy match-opposite?]
-  (ptk/reify ::modify-point
+  (ptk/reify ::modify-handler
     ptk/UpdateEvent
     (update [_ state]
       (let [content (get-in state (st/get-path state :content))
             [cx cy] (if (= prefix :c1) [:c1x :c1y] [:c2x :c2y])
             [ocx ocy] (if (= prefix :c1) [:c2x :c2y] [:c1x :c1y])
+            point (gpt/point (+ (get-in content [index :params cx]) dx)
+                             (+ (get-in content [index :params cy]) dy))
             opposite-index (ugp/opposite-index content index prefix)]
         (cond-> state
           :always
-          (update-in [:workspace-local :edit-path id :content-modifiers index] assoc
-                     cx dx cy dy)
+          (-> (update-in [:workspace-local :edit-path id :content-modifiers index] assoc
+                         cx dx cy dy)
+              (assoc-in [:workspace-local :edit-path id :moving-handler] point))
 
           (and match-opposite? opposite-index)
           (update-in [:workspace-local :edit-path id :content-modifiers opposite-index] assoc
@@ -63,7 +66,7 @@
             [rch uch] (changes/generate-path-changes page-id shape (:content shape) new-content)]
 
         (rx/of (dwc/commit-changes rch uch {:commit-local? true})
-               (fn [state] (update-in state [:workspace-local :edit-path id] dissoc :content-modifiers)))))))
+               (fn [state] (update-in state [:workspace-local :edit-path id] dissoc :content-modifiers :moving-nodes :moving-handler)))))))
 
 (defn move-selected-path-point [from-point to-point]
   (letfn [(modify-content-point [content {dx :x dy :y} modifiers point]
@@ -101,7 +104,9 @@
               modifiers (->> points
                              (reduce modifiers-reducer {}))]
 
-          (assoc-in state [:workspace-local :edit-path id :content-modifiers] modifiers))))))
+          (-> state
+              (assoc-in [:workspace-local :edit-path id :moving-nodes] true)
+              (assoc-in [:workspace-local :edit-path id :content-modifiers] modifiers)))))))
 
 (defn start-move-path-point
   [position shift?]
@@ -120,11 +125,6 @@
 
             mouse-drag-stream
             (rx/concat
-             ;; If we're dragging a selected item we don't change the selection
-             (if selected?
-               (rx/empty)
-               (rx/of (selection/select-node position shift?)))
-
              ;; This stream checks the consecutive mouse positions to do the draging
              (->> points
                   (streams/move-points-stream start-position selected-points)

frontend/src/app/main/data/workspace/path/selection.cljs

@@ -28,15 +28,6 @@
       (let [id (st/get-path-id state)]
         (update-in state [:workspace-local :edit-path id :hover-points] disj position)))))
 
-(defn select-handler [index type]
-  (ptk/reify ::select-handler
-    ptk/UpdateEvent
-    (update [_ state]
-      (let [id (get-in state [:workspace-local :edition])]
-        (-> state
-            (update-in [:workspace-local :edit-path id :selected-handlers] (fnil conj #{}) [index type]))))))
-
-
 (defn path-handler-enter [index prefix]
   (ptk/reify ::path-handler-enter
     ptk/UpdateEvent
@@ -115,7 +106,6 @@
     (update [_ state]
       (let [id (st/get-path-id state)]
         (-> state
-            (assoc-in [:workspace-local :edit-path id :selected-handlers] #{})
             (assoc-in [:workspace-local :edit-path id :selected-points] #{}))))))
 
 (defn update-area-selection

frontend/src/app/main/data/workspace/path/streams.cljs

@@ -58,36 +58,39 @@
   [start-point selected-points points]
 
   (let [zoom (get-in @st/state [:workspace-local :zoom] 1)
-        ranges (snap/create-ranges selected-points points)
-        d-pos (/ snap/snap-accuracy zoom)]
+        ranges (snap/create-ranges points selected-points)
+        d-pos (/ snap/snap-path-accuracy zoom)
+
+        check-path-snap
+        (fn [position]
+          (let [delta (gpt/subtract position start-point)
+                moved-points (->> selected-points (mapv #(gpt/add % delta)))
+                snap (snap/get-snap-delta moved-points ranges d-pos)]
+            (gpt/add position snap)))]
     (->> ms/mouse-position
-         (rx/map (fn [position]
-                   (let [delta (gpt/subtract position start-point)
-                         moved-points (->> selected-points (mapv #(gpt/add % delta)))]
-                     (gpt/add
-                      position
-                      (snap/get-snap-delta moved-points ranges d-pos)))))))
-  )
+         (rx/map check-path-snap))))
 
 (defn move-handler-stream
   [start-point handler points]
 
   (let [zoom (get-in @st/state [:workspace-local :zoom] 1)
         ranges (snap/create-ranges points)
-        d-pos (/ snap/snap-accuracy zoom)]
+        d-pos (/ snap/snap-path-accuracy zoom)
+
+        check-path-snap
+        (fn [position]
+          (let [delta (gpt/subtract position start-point)
+                handler-position (gpt/add handler delta)
+                snap (snap/get-snap-delta [handler-position] ranges d-pos)]
+            (gpt/add position snap)))]
     (->> ms/mouse-position
-         (rx/map (fn [position]
-                   (let [delta (gpt/subtract position start-point)
-                         handler-position (gpt/add handler delta)]
-                     (gpt/add
-                      position
-                      (snap/get-snap-delta [handler-position] ranges d-pos))))))))
+         (rx/map check-path-snap))))
 
 (defn position-stream
   [points]
   (let [zoom (get-in @st/state [:workspace-local :zoom] 1)
         ;; ranges (snap/create-ranges points)
-        d-pos (/ snap/snap-accuracy zoom)
+        d-pos (/ snap/snap-path-accuracy zoom)
         get-content (fn [state] (get-in state (state/get-path state :content)))
 
         content-stream
@@ -103,9 +106,7 @@
          (rx/with-latest vector ranges-stream)
          (rx/map (fn [[position ranges]]
                    (let [snap (snap/get-snap-delta [position] ranges d-pos)]
-                     #_(prn ">>>" snap)
-                     (gpt/add position snap))
-                   ))
+                     (gpt/add position snap))))
 
          (rx/with-latest merge (->> ms/mouse-position-shift (rx/map #(hash-map :shift? %))))
          (rx/with-latest merge (->> ms/mouse-position-alt (rx/map #(hash-map :alt? %)))))))

frontend/src/app/main/snap.cljs

@@ -20,6 +20,7 @@
    [clojure.set :as set]))
 
 (defonce ^:private snap-accuracy 5)
+(defonce ^:private snap-path-accuracy 10)
 (defonce ^:private snap-distance-accuracy 10)
 
 (defn- remove-from-snap-points
@@ -272,9 +273,8 @@
             (->> (rt/range-query (get ranges coord) (- pval precision) (+ pval precision))
                  ;; We save the distance to the point and add the matching point to the points
                  (mapv (fn [[value points]]
-                         [(mth/abs (- value pval))
+                         [(- value pval)
                           (->> points (mapv #(vector point %)))])))))]
-
     {:x (query-coord point :x)
      :y (query-coord point :y)}))
 
@@ -301,7 +301,7 @@
   [default matches]
   (let [get-min
         (fn [[cur-val :as current] [other-val :as other]]
-          (if (< cur-val other-val)
+          (if (< (mth/abs cur-val) (mth/abs other-val))
             current
             other))
         

frontend/src/app/main/ui/workspace/shapes/path/editor.cljs

@@ -19,6 +19,7 @@
    [app.util.dom :as dom]
    [app.util.geom.path :as ugp]
    [app.util.keyboard :as kbd]
+   [clojure.set :refer [map-invert]]
    [goog.events :as events]
    [rumext.alpha :as mf])
   (:import goog.events.EventType))
@@ -42,7 +43,10 @@
           (let [shift? (kbd/shift? event)]
             (cond
               (= edit-mode :move)
-              (st/emit! (drp/start-move-path-point position shift?))
+              ;; If we're dragging a selected item we don't change the selection
+              (do (when (not selected?)
+                    (st/emit! (drp/select-node position shift?)))
+                  (st/emit! (drp/start-move-path-point position shift?)))
 
               (and (= edit-mode :draw) start-path?)
               (st/emit! (drp/start-path-from-point position))
@@ -84,14 +88,6 @@
           (fn [event]
             (st/emit! (drp/path-handler-leave index prefix)))
 
-          on-click
-          (fn [event]
-            (dom/stop-propagation event)
-            (dom/prevent-default event)
-            (cond
-              (= edit-mode :move)
-              (drp/select-handler index prefix)))
-
           on-mouse-down
           (fn [event]
             (dom/stop-propagation event)
@@ -123,7 +119,6 @@
        [:circle {:cx x
                  :cy y
                  :r (/ 10 zoom)
-                 :on-click on-click
                  :on-mouse-down on-mouse-down
                  :on-mouse-enter on-enter
                  :on-mouse-leave on-leave
@@ -145,7 +140,7 @@
                    :preview? true
                    :zoom zoom}]])
 
-(mf/defc snap-points [{:keys [selected points zoom]}]
+(mf/defc path-snap [{:keys [selected points zoom]}]
   (let [ranges (mf/use-memo (mf/deps selected points) #(snap/create-ranges points selected))
         snap-matches (snap/get-snap-delta-match selected ranges (/ 1 zoom))
         matches (d/concat [] (second (:x snap-matches)) (second (:y snap-matches)))]
@@ -172,19 +167,41 @@
                 preview
                 content-modifiers
                 last-point
-                selected-handlers
                 selected-points
+                moving-nodes
+                moving-handler
                 hover-handlers
                 hover-points]
          :as edit-path} (mf/deref edit-path-ref)
 
-        {base-content :content} shape
+        selected-points (or selected-points #{})
+
+        base-content (:content shape)
+        base-points (mf/use-memo (mf/deps base-content) #(->> base-content ugp/content->points))
+
         content (ugp/apply-content-modifiers base-content content-modifiers)
-        points (mf/use-memo (mf/deps content) #(->> content ugp/content->points (into #{})))
+        content-points (mf/use-memo (mf/deps content) #(->> content ugp/content->points))
+
+        point->base (->> (map hash-map content-points base-points) (reduce merge))
+        base->point (map-invert point->base)
+
+        points (into #{} content-points)
+
         last-command (last content)
         last-p (->> content last ugp/command->point)
         handlers (ugp/content->handlers content)
 
+        [snap-selected snap-points]
+        (cond
+          (some? drag-handler) [#{drag-handler} points]
+          (some? preview) [#{(ugp/command->point preview)} points]
+          (some? moving-handler) [#{moving-handler} points]
+          :else
+          [(->> selected-points (map base->point) (into #{}))
+           (->> points (remove selected-points) (into #{}))])
+
+        show-snap? (or (some? drag-handler) (some? preview) (some? moving-handler) moving-nodes)
+
         handle-double-click-outside
         (fn [event]
           (when (= edit-mode :move)
@@ -199,13 +216,14 @@
 
     [:g.path-editor {:ref editor-ref}
      (when (and preview (not drag-handler))
-       [:*
-        [:& snap-points {:selected #{(ugp/command->point preview)}
-                         :points points
-                         :zoom zoom}]
+       [:& path-preview {:command preview
+                         :from last-p
+                         :zoom zoom}])
 
-        [:& path-preview {:command preview
-                          :from last-p
+     (when drag-handler
+       [:g.drag-handler {:pointer-events "none"}
+        [:& path-handler {:point last-p
+                          :handler drag-handler
                           :zoom zoom}]])
 
      (when @hover-point
@@ -214,10 +232,11 @@
                         :zoom zoom}]])
 
      (for [position points]
-       (let [point-selected? (contains? selected-points position)
-             point-hover? (contains? hover-points position)
-             last-p? (= last-point position)
+       (let [point-selected? (contains? selected-points (get point->base position))
+             point-hover? (contains? hover-points (get point->base position))
+             last-p? (= last-point (get point->base position))
              start-p? (not (some? last-point))]
+
          [:g.path-node
           [:g.point-handlers {:pointer-events (when (= edit-mode :draw) "none")}
            (for [[index prefix] (get handlers position)]
@@ -225,7 +244,6 @@
                    x (get-in command [:params (d/prefix-keyword prefix :x)])
                    y (get-in command [:params (d/prefix-keyword prefix :y)])
                    handler-position (gpt/point x y)
-                   handler-selected? (contains? selected-handlers [index prefix])
                    handler-hover? (contains? hover-handlers [index prefix])]
                (when (not= position handler-position)
                  [:& path-handler {:point position
@@ -233,7 +251,6 @@
                                    :index index
                                    :prefix prefix
                                    :zoom zoom
-                                   :selected? handler-selected?
                                    :hover? handler-hover?
                                    :edit-mode edit-mode}])))]
           [:& path-point {:position position
@@ -250,9 +267,9 @@
                           :handler prev-handler
                           :zoom zoom}]])
 
-     (when drag-handler
-       [:g.drag-handler {:pointer-events "none"}
-        [:& path-handler {:point last-p
-                          :handler drag-handler
-                          :zoom zoom}]])]))
+     (when show-snap?
+       [:g.path-snap {:pointer-events "none"}
+        [:& path-snap {:selected snap-selected
+                         :points snap-points
+                         :zoom zoom}]])]))
 

frontend/src/app/main/ui/workspace/viewport/actions.cljs

@@ -59,7 +59,7 @@
            (when (and (not= edition id) text-editing?)
              (st/emit! dw/clear-edition-mode))
 
-           (when (and (or (not edition) (not= edition id))
+           (when (and (not text-editing?)
                       (not blocked)
                       (not hidden)
                       (not (#{:comments :path} drawing-tool))