Mandelbrot Set: fix the hang, centre the zoom, add held-key panning

ReadMe.md

@@ -141,7 +141,7 @@ The Flipper and its community wouldn't be as rich as it is without your contribu
 | Etch-A-Sketch | ![Games Badge] | [by SimplyMinimal](https://github.com/SimplyMinimal/FlipperZero-Etch-A-Sketch) |  | ![None Badge] |
 | Pong | ![Games Badge] | [by nmrr](https://github.com/nmrr/flipperzero-pong) | Modified by [SimplyMinimal](https://github.com/SimplyMinimal/FlipperZero-Pong) | [![UFW Badge]](https://lab.flipper.net/apps/flipper_pong) |
 | Game of Life (Updated to work by tgxn) | ![Games Badge] | [by itsyourbedtime](https://github.com/tgxn/flipperzero-firmware/blob/dev/applications/game_of_life/game_of_life.c) |  | [![UFW Badge]](https://lab.flipper.net/apps/gameoflife) |
-| Mandelbrot Set | ![Games Badge] | [by Possibly-Matt](https://github.com/Possibly-Matt/flipperzero-firmware-wPlugins) |  | [![UFW Badge]](https://lab.flipper.net/apps/mandelbrotset) |
+| Mandelbrot Set | ![Games Badge] | by Possibly-Matt |  | [![UFW Badge]](https://lab.flipper.net/apps/mandelbrotset) |
 | Monty Hall | ![Games Badge] | [by DevMilanIan](https://github.com/RogueMaster/flipperzero-firmware-wPlugins/pull/203) |  | [![UFW Badge]](https://lab.flipper.net/apps/montyhall) |
 | Nu Pogodi! (Ну, погоди!) | ![Games Badge] | [by sionyx](https://github.com/sionyx/flipper_nupogodi) |  | [![UFW Badge]](https://lab.flipper.net/apps/nupogodi) |
 | Paint | ![Games Badge] | [by iinsaane](https://github.com/iinsaane) |  | [![UFW Badge]](https://lab.flipper.net/apps/paint) |

apps_source_code/mandelbrot/CHANGELOG.md

@@ -0,0 +1,31 @@
+# Changelog
+
+## 1.4
+
+- Compute the picture on the app thread, only when the view actually changed, and hand it to the draw callback as a ready-made bitmap. It used to be computed inside the draw callback, on the GUI service thread, and requested afresh at least ten times a second whether or not anything had moved; once enough pixels reached the iteration limit the app could no longer keep up with its own redraws and the device stopped responding to buttons
+- Show a coarse preview first and refine it band by band, checking for key presses between scanlines, so a slow picture at high zoom can be interrupted instead of holding up the event loop
+- Skip the iteration loop for points in the main cardioid and the period-2 bulb, the two large solid regions that always cost the full iteration budget
+- Zoom around the middle of the screen; zooming used to shrink the picture towards its top left corner
+- Halve or double the visible span per zoom step. The old step subtracted a fixed amount from the span, which drove it through zero and mirrored the picture after about two dozen presses
+- Hold Ok to zoom back out, which the app previously could not do at all, and stop zooming in at 16384x, where single precision floats run out of mantissa
+- Show the zoom factor for a moment after each step, so reaching either limit is visible instead of looking like the app stopped reacting
+- Hold a direction key to keep panning, and pan by a fixed fraction of the screen so the step stays usable at every zoom level
+- Keep the visible window within reach of the set, so panning cannot strand the view in empty space with no way back
+- Use square pixels and raise the iteration budget with the zoom level: the picture used to be squashed horizontally by about a tenth, and deep views collapsed into a solid blob
+- Point the app link at this repository, since the original author's GitHub account no longer exists
+
+## 1.3
+
+- Version bump for catalog compatibility (no functional changes)
+
+## 1.2
+
+- Version bump for catalog compatibility (no functional changes)
+
+## 1.1
+
+- Release the state mutex before asking for a redraw, instead of holding it across the request
+
+## 1.0
+
+- Initial release: browse the Mandelbrot set with the arrow keys, Ok to zoom in

apps_source_code/mandelbrot/application.fam

@@ -5,12 +5,12 @@ App(
     entry_point="mandelbrot_app",
     cdefines=["APP_MANDELBROT_GAME"],
     requires=["gui"],
-    stack_size=1 * 1024,
+    stack_size=2 * 1024,
     order=130,
     fap_icon="Mandelbrot.png",
     fap_category="Games",
     fap_author="@Possibly-Matt",
-    fap_weburl="https://github.com/Possibly-Matt",
-    fap_version="1.3",
+    fap_weburl="https://github.com/xMasterX/all-the-plugins",
+    fap_version="1.4",
     fap_description="The Mandelbrot set is the set of all so-called (complex) numbers that meet Mandelbrots simple arithmetic criterion.",
 )