Use a fixed curve for the fan

The arc radius no longer grows with the number of entries; a short fan is
the bottom of the same curve, like the Dock. The lean setting becomes a
curve radius in multiples of the icon spacing. The 60° cap only kicks in
for very large fans.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

README.md

@@ -17,7 +17,7 @@ Escape) to fold the fan back into the icon.
 - Thumbnails for images, PDFs, videos and whatever else your thumbnailers
   cover, using the same preview plugins as Dolphin.
 - Curves to the right, or to the left when the arc would not fit on screen.
-- Configurable lean angle, number of entries, icon size, animation length,
+- Configurable curve radius, number of entries, icon size, animation length,
   folder, panel icon, sort order, hidden files.
 - Middle-click the panel icon to open the folder. Drop files on it to move
   them into the folder.
@@ -54,7 +54,7 @@ and choose *Configure…* to change the folder, icon and the rest.
 | Icon | `folder-download` | Icon shown on the panel |
 | Files shown in the fan | 8 | Entries before the "N more…" item |
 | Fan icon size | 48 px | Icon size inside the fan |
-| Fan lean at the top | 38° | How far the top entry tilts from vertical; the arc starts vertical at the icon |
+| Curve radius | 13 × icon spacing | Radius of the arc; the curve is the same however many entries there are. Smaller curls over more |
 | Fan curves | Away from the screen edge | Force right or left if you prefer |
 | Animation length | 350 ms | Scaled by the global animation speed |
 | Sort by / Descending / Folders first | Date, descending | Same options as Folder View |
@@ -85,9 +85,10 @@ Layout:
 - `contents/ui/FanItem.qml` – one entry: icon, label, open/close animation
 - `contents/ui/configGeneral.qml`, `contents/config/main.xml` – settings
 
-The arc is a circle that leaves the panel icon vertically. Its radius grows
-with the number of entries so that the top entry tilts exactly as far as the
-configured lean, capped at 60° to keep each label clear of the icon above.
+The arc is a circle of fixed radius that leaves the panel icon vertically,
+so a short fan is just the bottom of the same curve. Only if a very large fan
+would tilt its top entry past 60° does the radius grow, to keep each label
+clear of the icon above.
 
 ## License
 

contents/config/main.xml

@@ -26,9 +26,9 @@
       <label>Put the first file of the sort order (newest, by default) at the top of the fan and the "more" entry at the bottom.</label>
       <default>true</default>
     </entry>
-    <entry name="fanLean" type="Int">
-      <label>How far the top of the fan leans sideways, in degrees from vertical. The fan always starts vertical at the panel icon.</label>
-      <default>38</default>
+    <entry name="fanRadius" type="Int">
+      <label>Radius of the fan's curve, in multiples of the spacing between entries. The curve is the same whatever the number of entries; smaller values curl over more.</label>
+      <default>13</default>
     </entry>
     <entry name="direction" type="Int">
       <label>Which way the fan curves: 0 = automatic, 1 = right, 2 = left.</label>

contents/ui/FanPopup.qml

@@ -39,11 +39,14 @@ PlasmaCore.Dialog {
     readonly property int gap: Math.round(iconSize * 0.35)
     readonly property int step: iconSize + gap
     readonly property bool newestAtTop: Plasmoid.configuration.newestAtTop
-    // The arc leaves the dock icon vertically and tilts over until its top
-    // entry leans this far from vertical (radians). Above ~60° a label, which
-    // sits beside its icon towards the inside of the curve, would run into
-    // the icon above it even with the small downward label offset below.
-    readonly property real maxTangent: Math.max(10, Math.min(60, Plasmoid.configuration.fanLean)) * Math.PI / 180
+    // The arc leaves the dock icon vertically and curls over with a fixed
+    // radius, like the Dock's fan: a short fan is simply the bottom of the
+    // same curve. Above ~60° of tilt a label, which sits beside its icon
+    // towards the inside of the curve, would run into the icon above it even
+    // with the small downward label offset, so the radius only grows beyond
+    // the configured one when a very large fan would pass that.
+    readonly property real fixedRadius: step * Math.max(4, Math.min(60, Plasmoid.configuration.fanRadius))
+    readonly property real maxTangent: 60 * Math.PI / 180
     readonly property int labelDrop: Math.round(iconSize / 6)
     readonly property int labelGap: Math.round(iconSize * 0.25)
     readonly property int labelMaxWidth: iconSize * 5
@@ -52,8 +55,7 @@ PlasmaCore.Dialog {
     readonly property real firstDistance: dockHalf + iconSize * 0.75
     readonly property int itemCount: fanRepeater.count + 1
     readonly property real arcLength: firstDistance + (itemCount - 1) * step
-    // Radius grows with the number of entries so the arc always ends at maxTangent.
-    readonly property real arcRadius: Math.max(step * 8, arcLength / maxTangent)
+    readonly property real arcRadius: Math.max(fixedRadius, arcLength / maxTangent)
     readonly property real maxAngle: angleFor(itemCount - 1)
     readonly property real arcWidth: arcRadius * (1 - Math.cos(maxAngle))
     readonly property real arcHeight: arcRadius * Math.sin(maxAngle)

contents/ui/configGeneral.qml

@@ -16,7 +16,7 @@ KCM.SimpleKCM {
     property alias cfg_fanIconSize: iconSizeSpin.value
     property int cfg_direction
     property alias cfg_newestAtTop: newestAtTopCheck.checked
-    property alias cfg_fanLean: leanSpin.value
+    property alias cfg_fanRadius: radiusSpin.value
     property alias cfg_previews: previewsCheck.checked
     property alias cfg_showHiddenFiles: hiddenCheck.checked
     property int cfg_sortMode
@@ -70,11 +70,11 @@ KCM.SimpleKCM {
         }
 
         QQC2.SpinBox {
-            id: leanSpin
-            Kirigami.FormData.label: i18n("Fan lean at the top:")
-            from: 10
+            id: radiusSpin
+            Kirigami.FormData.label: i18n("Curve radius:")
+            from: 4
             to: 60
-            textFromValue: (value, locale) => i18n("%1°", value)
+            textFromValue: (value, locale) => i18n("%1 × icon spacing", value)
             valueFromText: (text, locale) => parseInt(text)
         }