public/subjects/mouse-trap/README.md

## Mouse trap

### Instructions

Develop a trap to capture the elements when the mouse is getting too close to the center of the page!

- Create a function `createCircle`: make it fire on every click on the page, and create a `div` at the position of the mouse on the screen, setting its `background` to `white` and its class to `circle`

- Create a function `moveCircle`: make it fire when the mouse moves, and get the last circle created and makes it move along with the mouse

- Create a function `setBox` which sets a box with the class `box` in the center of the page ; when a circle is inside that box, it has to be purple (use the CSS global variable `var(--purple)` as `background`) ; once a circle enters the box, it is trapped inside and cannot go out of it anymore.

> Hint: Be careful, a circle cannot overlap the box which has walls of `1px`, it has to be trapped **strictly** inside.

### Notions

- [`addEventListener()`](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener): `click`, `mousemove`
- [`removeEventListener()`](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/removeEventListener)
- [Mouse event](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/MouseEvent): [`click`](https://developer.mozilla.org/en-US/docs/Web/API/Element/click_event), [`mousemove`](https://developer.mozilla.org/en-US/docs/Web/API/Element/mousemove_event) / [`clientX`](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/clientX), [`clientY`](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/clientY)
- [`getBoundingClientRect()`](https://developer.mozilla.org/en-US/docs/Web/API/Element/getBoundingClientRect)

### Provided files

### Files

You only need to create & submit the JS file `mouse-trap.js` ; we're providing you the following file to download (click right and save link) & test locally:

- the HTML file [mouse-trap.html](./mouse-trap.html) to open in the browser, which includes:

  - the JS script which will allow to run your code
  - some CSS pre-styled classes: feel free to use those as they are, or modify them

### Expected result

You can see an example of the expected result [here](https://youtu.be/qF843P-V2Yw)