Mosaic

Turn an image into a Mosaic. Based on vanilla JS, HTML and CSS

Setup

In your command prompt, go to your local repository. Then type in: git clone https://github.com/smoroso/Mosaic

Use

npm start

Open your browser and go to: http://localhost:8765

Initial instructions

Photo mosaic

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/ serves an SVG mosaic tile for color . 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!