Basic example?

Nobody has claimed this yet.

Hi,

I'm trying to use Abaculus to generate a hi-res image. However, I haven't got the hang of the _getTile_ function.

Could you give a simple example that, say, uses tiles from _examples.map-zr0njcqy_ (from the developer docs: _http://api.tiles.mapbox.com/v4/examples.map-zr0njcqy/0/0/0.png?access_token=pk.eyJ1Ijoid3JpZ2dsZXIiLCJhIjoiOXBUMjFERSJ9.jo2f0W7fTzbX-7lj_8pk7g_) and saves an image to the local disk?

This is as far as I got, and the getTile function (at least) is clearly incorrect.

```
// Calculate image bounds from center lng,lat coordinates and
// pixel dimensions of final image (will be multipled by scale).
var params = {
zoom: 4,
scale: 4,
center: {
x: 20,
y: -10,
w: 100,
h: 100
},
//format: {format},
//quality: {quality},
getTile: function(z,x,y, callback){
// do something
return 'http://api.tiles.mapbox.com/v4/examples.map-zr0njcqy/' + z + '/' + x + '/' + y + '.png?access_token=pk.eyJ1Ijoid3JpZ2dsZXIiLCJhIjoiOXBUMjFERSJ9.jo2f0W7fTzbX-7lj_8pk7g';
//return callback(null, buffer, headers);
},
//limit: {limit}
};

abaculus(params, function(err, image){
if (err) return err;
console.log('File saved.');
// do something with image
});
```

I know that the Static Maps API exists, but this does not allow images large enough for my purposes.

Many thanks,

Start with the getTile entry point in the issue and the developer documentation it references, then inspect how the abaculus callback returns the generated image. Add a simple example using the supplied Mapbox tile URL that saves the resulting image locally; done means a newcomer can run the example successfully.

Written by the indexing model from the issue text.