FINAL BROADCAST — Flutter

A Flutter web port of FINAL BROADCAST, a retro horror idle game. You run the night shift at KBLK-7, a station that lost its licence in 1987 and never quite stopped transmitting.

The original is a single self-contained HTML file — procedural 2D canvas, synthesised WebAudio, no assets. This is that game rebuilt on CustomPainter and dart:ui.

flutter run -d chrome
flutter build web --release --base-href /final-broadcast-flutter/

How it is put together

lib/src/consts.dart      geometry, colours, and the data tables
                         (10 producers, 12 upgrades, 8 counters, 8 anomalies,
                         the 7-segment run-down, the fake commercials)
lib/src/state.dart       GameState (ChangeNotifier) + save/load, same
                         localStorage key and JSON shape as the HTML build
lib/src/economy.dart     signal/subscriber rates, costs, prestige, sabotage hooks
lib/src/anomalies.dart   the scheduler, banish/jumpscare, the sabotage rules
lib/src/bake.dart        PictureRecorder -> ui.Image helper + blend-mode helpers
lib/src/paint/           room, window, tube, faces, entities, feed, booth
lib/src/ui/              status bar, rack, deck, manual, ad break, end sheet
lib/src/audio.dart       WebAudio through dart:js_interop, behind an interface

Notes from the port

Everything static is baked once. PictureRecorder -> ui.Image, then blitted: the back wall (700x486), the field outside the window (200x664), frost, the eight 256x320 face plates with their rim and subsurface derivations, cloth, noise tiles.

Blend modes. Separable ops (lighter/multiply/screen/soft-light) are set per Paint, which is what canvas2d actually does per draw. Only the Porter-Duff ops (dstIn/dstOut/srcATop) get a saveLayer, because they need the surface fenced.

There is no synchronous pixel readback in Flutter. The HTML called getImageData every frame to bend the CRT raster by row luminance; Image.toByteData is async, so that is driven from game state instead (anomaly progress, tune heat, glitch, dread).

Fonts. CanvasKit does not resolve system font families, so Courier New silently becomes Roboto and the whole game renders proportional. Courier Prime (OFL) ships under the same family name — it is metric-compatible, so every hard-coded layout number still lands. Box-drawing glyphs were replaced with ASCII, which a 1987 character generator would have used anyway.

Licence

MIT, except assets/fonts/ — Courier Prime is OFL, see LICENSES-fonts.txt.