render function
add an event to the render function
| Parameter | Type | Description |
|---|---|---|
| canvas | String | id of canvas to add event to render function |
| id | String | unique id of the render event |
| event | Function | event to add to render function |
remove an event from the render function
| Parameter | Type | Description |
|---|---|---|
| canvas | String | id of canvas to remove event from render function |
| id | String | id of the render event |