Photo mosaic
------------
## Installation
`npm install`
`npm start`
## Task
The goal of this task is to implement the following flow in a client-side app.
1. A user selects a local image file.
2. The app loads that image, divides the image into tiles, computes the average
color of each tile, fetches a tile from the server for that color, and
composites the results into a photomosaic of the original image.
3. The composited photomosaic should be displayed according to the following
constraints:
- tiles should be rendered a complete row at a time (a user should never
see a row with some completed tiles and some incomplete)
- the mosaic should be rendered from the top row to the bottom row.
4. The client app should make effective use of parallelism and asynchrony.
The project skeleton contains a lightweight server (written in node) for
serving the client app and the tile images. To start it, run npm start.
/ serves mosaic.html
/js/* serves static resources
/color/<hex> serves an SVG mosaic tile for color <hex>. e.g., /color/0e4daa
The tile size should be configurable via the code constants in js/mosaic.js.
The project skeleton is already set up to include those constants in both the
mosaic client and the mosaic server. The default size is 16x16.
You should:
- pretend you're submitting this as production-quality code for review; i.e.,
- write effective comments;
- make the code modular;
- make the code testable;
- avoid using JS libraries (e.g., jQuery, Modernizr, React) as browser APIs
are sufficient for the exercise and we're not testing for familiarity with
any particular tools;
- use HTML5 features where appropriate;
- allocate about 3 hours to do the task.
You may:
- edit /etc/hosts;
- use any HTML5 feature supported by current Chrome (e.g., Promise, Worker);
- be as creative as you like with the submission UI (file input, drag & drop,
etc); however, it is not the focus of the task, a minimal UI is fine.
Have fun!