Upgrade dependencies, change get_tile API to use complex plane coordi…

…nates, add tests

.github/workflows/deploy.yml

@@ -1,19 +1,21 @@
-on: push
-name: publish web app
+name: Deploy
+on:
+  push:
+    branches: [master]
 jobs:
   publish:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v2
       - name: Install
         run: curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
-      - uses: actions/setup-node@v2.1.2
+      - uses: actions/setup-node@v2
         with:
-          node-version: "10"
+          node-version: "18"
       - name: Install dependencies
         working-directory: ./client
         run: |
-          npm ci --no-optional
+          npm i
       - name: Build project
         working-directory: ./client
         run: |

README.md

@@ -17,20 +17,17 @@
 
 - Set max iterations to adjust speed vs render quality
 - "Multibrot" sets can be rendered by increasing the exponent parameter
-- Tune rendering performance by setting the number of worker threads
 - Adjust the size of map tiles
 - Enter fullscreen mode
 - Save the visible portion of the fractal as an image
 
 ## Local development
 
 - Build scripts are available in [<code>client/package.json</code>](client/package.json). You can use the following commands from within `client/`:
-    - `npm install` -- Install npm dependencies
-    - `npm run start` -- Serve the project locally for development at `http://localhost:9090`
-    - `npm run build` -- Build the project for production
-    - `npm run test` -- Run Rust tests
-    - `npm run lint` -- Find problems with code
+  - `npm install` -- Install npm dependencies
+  - `npm run start` -- Serve the project locally for development at `http://localhost:9090`
+  - `npm run build` -- Build the project for production
+  - `npm run test` -- Run Rust tests
+  - `npm run lint` -- Find problems with code
 
 If you get weird errors, try running `./clean.sh` to purge all dependency caches.
-
-The project is based on [this Rust WASM worker template](https://github.com/DDR0/large-graph-editor/tree/updated-deps).