# Scrawl-canvas v8 - DOM test 009

## Stop and restart the main animation loop; add and remove event listener
Retrieve all artefacts at a given coordinate

### Move mouse cursor over circles to make them opaque (when animation loop is active)
Click on the stack element to change direction of rotation (when stack listener is active)

#### Test purpose

- Test manipulation of a set of stack entitys via their group
- Test Group.getAllArtefactsAt functionality
- Create and use a scrawl Color object to generate randomized color strings in a restricted range of colors

- Move artefacts from one group object to another
- Start, stop and restart the core animation loop
- Dynamically add/remove event listeners to/from the stack

Touch test: should work as expected

Annotated code