Fix graph crash on reload, even out depth sizes

Client/Graph.py

@@ -220,8 +220,11 @@ class Layout:
 # Directories go down the heading colours by depth (h1 Mauve, h2 Blue, ...),
 # starting again after Red. Files are White.
 DepthColours = ["Mauve", "Blue", "Green", "Yellow", "Peach", "Red"]
-ShrinkPerDepth = 0.8  # with GraphShrinkByDepth, each level's directory dots are this much smaller
-SmallestDirectory = 3  # ...but never smaller than a file's dot
+# With GraphShrinkByDepth, directory dots shrink in even steps from their
+# usual size to a file dot's size (a file with one link) at this depth (the
+# red ones), and stay that size below it.
+ShrinkDepth = 5
+FileDotRadius = 3.8
 
 
 def DirectoryColour(Depth: int) -> str:
@@ -370,17 +373,22 @@ class GraphView(ft.Container):
             self.Status.value = "Nothing to show here."
             self.Status.update()
             return
-        self.Layout = Layout(Graph)
+        # This thread keeps its own Layout: a Reload meanwhile (the graph
+        # opening, or the scope changing) clears self.Layout for its own thread.
+        Settling = Layout(Graph)
         Base = len(Path.split("/")) if Path else 0
-        self.Depths = np.array([(len(Node["Id"].split("/")) if Node["Id"] else 0) - Base for Node in self.Layout.Nodes])
-        self.Colours = [(DirectoryColour(int(Depth)) if self.ColourByDepth else Palette.Mauve) if Node["IsDirectory"]
-                        else Palette.White for Node, Depth in zip(self.Layout.Nodes, self.Depths)]
+        Depths = np.array([(len(Node["Id"].split("/")) if Node["Id"] else 0) - Base for Node in Settling.Nodes])
+        Colours = [(DirectoryColour(int(Depth)) if self.ColourByDepth else Palette.Mauve) if Node["IsDirectory"]
+                   else Palette.White for Node, Depth in zip(Settling.Nodes, Depths)]
+        if Generation != self.Generation or self.Closed:
+            return
+        self.Layout, self.Depths, self.Colours = Settling, Depths, Colours
         self.StatusBox.visible = False
         self.StatusBox.update()
         # Settle in steps, drawing as it goes, like the web view's animation.
-        while not self.Layout.Settled:
+        while not Settling.Settled:
             for _ in range(TicksPerDraw):
-                self.Layout.Tick()
+                Settling.Tick()
             if Generation != self.Generation or self.Closed:
                 return
             self._Draw()
@@ -403,7 +411,8 @@ class GraphView(ft.Container):
         Degree = np.sqrt(self.Layout.Degree)
         DirectoryRadius = 5 + Degree * 1.6
         if self.ShrinkByDepth:
-            DirectoryRadius = np.maximum(SmallestDirectory, DirectoryRadius * ShrinkPerDepth ** self.Depths)
+            Step = np.minimum(self.Depths, ShrinkDepth) / ShrinkDepth
+            DirectoryRadius = DirectoryRadius + (FileDotRadius - DirectoryRadius) * Step
         self.Radius = np.maximum(2, np.where(IsDirectory, DirectoryRadius, 3 + Degree * 0.8) * Zoom)
 
     def _Label(self, Number: int, Colour: str) -> cv.Text:

Frontend/src/Components/GraphPane.jsx

@@ -20,8 +20,11 @@ const LabelZoom = 0.7; // below this, only hovered labels are drawn
 const ClickSlop = 4; // pixels a click may wander and still count as a click
 // Directories by depth, like the headings: h1 Purple, h2 Blue, ...
 const DepthRoles = ["Purple", "Blue", "Green", "Yellow", "Orange", "Red"];
-const ShrinkPerDepth = 0.8; // with ShrinkByDepth, each level's directory dots are this much smaller
-const SmallestDirectory = 3; // ...but never smaller than a file's dot
+// With ShrinkByDepth, directory dots shrink in even steps from their usual
+// size to a file dot's size (a file with one link) at this depth (the red
+// ones), and stay that size below it.
+const ShrinkDepth = 5;
+const FileDotRadius = 3.8;
 
 function ReadRole(Name) {
   return getComputedStyle(document.documentElement).getPropertyValue(`--${Name}`).trim();
@@ -206,7 +209,8 @@ export default function GraphPane({
       }
       Node.Colour = ColourByDepth ? DepthColours[Depth % DepthColours.length] : Colours.Directory;
       if (ShrinkByDepth) {
-        Node.Radius = Math.max(SmallestDirectory, Node.Radius * Math.pow(ShrinkPerDepth, Depth));
+        const Step = Math.min(Depth, ShrinkDepth) / ShrinkDepth;
+        Node.Radius += (FileDotRadius - Node.Radius) * Step;
       }
     }
     // Anything but "Left" (including an old "Middle") pans with Right.

README.md

@@ -306,7 +306,8 @@ links, scroll to zoom. One mouse button pans and the other opens the dot
 you click: right-drag pans and left-click opens by default, or the other way
 round in Settings > Graph. That's also where directories can be hidden
 (leaving only files and the links between them), all made purple instead
-of coloured by depth, or made smaller the deeper they are.
+of coloured by depth, or made smaller the deeper they are (down to a
+file dot's size at depth 5, the red ones).
 
 Rename takes a `/` to move, like the web view (`../Archive/Notes.md`).
 Shortcuts: Enter opens, Backspace goes up, F2 renames, Delete deletes,