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RxJS experiments – Multitouch/Mouse based canvas drawing

RxJS Experiments

RxJS experiments - Multitouch/Mouse based canvas drawing

The motivation of this project is to try outRxJS, without relying on any framework (CycleJS, ReactJS or AngularJS 2), not to experience the library in a specific context.

So far, I implemented the following features:

  • Multitouch/Mouse painting on a canvas
  • Accelerometer based background color (fallback on mouse position if no accelerometer)

Works on both desktop/mobile, but you’ll enjoy it more on your tablet/phone (with touch and accelerometer).

RxJS experiments - Multitouch/Mouse based canvas drawing

For the purpose fo this project, I developed the following:

  • Amicro-router (based onhistory)
  • A VanillaJS implementation of thebootstrap modal
  • It also usessensors-checker to detect accelerometers on devices

Resources:

Dev Workflow

Based on the boilerplate topheman/webpack-babel-starter .

Install

git clone https://github.com/topheman/rxjs-experiments.git cd rxjs-experiments npm install

Run

npm start

Goto http://localhost:8080

If you need to access from a remote device (such as a smartphone on the same network), just LOCALHOST=false npm start and your site will be accessible via your IP (which will be output on the terminal at launch).

I’m usingsensors-checker to check for accelerometer (since you can’t only rely on feature detection). To disable this detection (and be able to use the accelerometer emulator of the devtools), just:

SENSORS_CHECKER=false npm start

You can mix and match with LOCALHOST=false like: LOCALHOST=false SENSORS_CHECKER=false npm start

Build

The ./build directory is ignored by git, it will contain a dist directory which holds the distribution version of your website (the one that you willship once built).

All the build tasks will create a built version of the project in the ./build/dist folder, cleaning it before making the build.

  • npm run build
  • npm run build-prod optimized / uglified version
  • npm run build-prod-all will build:
    • production version (optimized / uglified)
    • a debuggable version accessible at /devtools shipping all the sourcemaps, to ease sharing transpiled source code

npm run serve-dist will serve your ./build/dist folder at http://localhost:3000 so that you could test the built version you just made.

Linter

  • eslint is running while you’re developping, check your console for errors
  • you can also launch it via npm run lint
  • see .eslintrc for the configuration (currently, this project usesthe airbnb presets – if you find it to restrictive, just remove "extends": "airbnb/base" in the .eslintrc )

Customizations

You can customize the behavior of the scripts by specifying environments vars:

  • NODE_ENV by default at development , NODE_ENV=production when you npm run build-prod
  • LINTER=false will disable the linter (enabled by default, ex: LINTER=false npm start )
  • STATS=true will write stats.json profiling file on disk from webpack at build (disabled by default, ex: STATS=true npm run build )
  • FAIL_ON_ERROR=true will break the build if any errors occurs (useful for CIs such ase Travis – at false in dev-server, at true when building)
  • LOCALHOST=false to access via IP from other devices on the same network (ex: LOCALHOST=false npm start – default true )
  • DEVTOOLS : By default at null . Used internally in npm run build-prod-all (you may not need that if you don’t do OSS)

FAQ / Deploy

See the topheman/webpack-babel-starter ‘s FAQ:

  • deploy on github pages -see wiki
  • a problem ? Checkout theFAQ

Copyright 2016 © Christophe Rosset

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. The Software is provided "as is", without warranty of any kind, express or implied, including but not limited to the warranties of merchantability, fitness for a particular purpose and noninfringement. In no event shall the authors or copyright holders be liable for any claim, damages or other liability, whether in an action of contract, tort or otherwise, arising from, out of or in connection with the software or the use or other dealings in the Software.

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