abaculus

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Library for creating static maps from tiles based on center or corner lng,lat coordinates. Uses node-blend.

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## abaculus
a small block of stone, tile, glass, or other material used in the construction of a mosaic

or,

a library for creating static maps from tiles based on center or corner lng,lat coordinates.
Uses node-mapnik to stitch tiles together.

[![Build Status](https://travis-ci.org/mapbox/abaculus.svg?branch=master)](https://travis-ci.org/mapbox/abaculus)

Looking to create high res images of maps? Abaculus was written for use in [Mapbox Studio](http://github.com/mapbox/mapbox-studio) and you can use Mapbox Studio to create and export high resolution images -- see [https://www.mapbox.com/guides/print/](https://www.mapbox.com/guides/print/) for more information. You can even use [that utility from the command line](https://github.com/mapbox/mapbox-studio/issues/1024#issuecomment-63535433).

### usage

Usage and example formatting below, or see the [tests](https://github.com/mapbox/abaculus/blob/master/test/test.js#L158-L204) for a more robust example with a `getTile` function.

#### input:
`scale`: integer between 1-4 and sets resolution (`scale: 1` is 72dpi, `scale: 4`, is 288dpi)

`zoom`: zoom level

`[w, s, e, n]`: the bounding box for the west (lat val), south (lng val), east (lat val), north (lng val) for the desired area

`x`: longitude coordinate

`y`: latitude coordinate

`width` and `height`: desired pixel bounds for a map with a center coordinate. Will be multiplied by scale to maintain resolution.

`format` (optional): `png` or `jpeg`, default is `png`.

`quality` (optional): when used with `jpeg` format, accepts 1-100 and defaults to 80. when used with `png` format, accepts 2-256 (# of colors to reduce the image to) and defaults to none.

`tileSize` (optional, defaults to `256`): Specifies input size of tiles used in `getTile` function.

`getTile`: a function that returns a tile buffer (png or otherwise) and headers given `z`, `x`, `y`, and a callback, such as from [tilelive-vector](https://github.com/mapbox/tilelive-vector/blob/master/index.js#L119-L218) or this [test function](https://github.com/mapbox/abaculus/blob/master/test/test.js#L184-L204).

`limit` (optional): max width or height of generated image in pixels. Default is `19008`.

```javascript
// Calculate image bounds from W,S,E,N bounding box.
var params = {
	zoom: {zoom},
	scale: {scale}
    bbox: [{w}, {s}, {e}, {n}],
    format: {format},
    quality: {quality},
	tileSize: {tileSize},
    getTile: function(z, x, y, callback){
		// do something
		return callback(null, buffer, headers);
	},
	limit: {limit}
};
```
or
```javascript
// Calculate image bounds from center lng,lat coordinates and
// pixel dimensions of final image (will be multipled by scale).
var params = {
	zoom: {zoom},
	scale: {scale}
    center: {
    	x: {x},
    	y: {y},
    	w: {width},
    	h: {height}
    },
    format: {format},
    quality: {quality},
	tileSize: {tileSize},
    getTile: function(z,x,y, callback){
		// do something
		return callback(null, buffer, headers);
	},
	limit: {limit}
};
```
#### usage:
``` javascript
abaculus(params, function(err, image, headers){
	if (err) return err;
	// do something with image
});
```

#### output:
an image of desired resolution for the selected area.

abaculus

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