Polygon

Polygon creates a polygon on the graph it takes in as many points as you give it [[x,y], [x,y], ...].

```graph
bounds: [-10, 10, 10, -10]
elements: [
	{type: polygon, def: [[2,0], [-1,4], [3,4]]}
]
```

To change the attributes of the points of a polygon you need to use the vertices object. To change the attributes of the lines of a polygon you need to use the borders object.

```graph
bounds: [-10, 10, 10, -10]
elements: [
	{type: polygon, def: [[2,0], [-1,4], [3,4]], att: {vertices: {strokeColor: red}, borders: {strokeColor: red}}}
]
```