A D3 color picker component. It's a color picker...*and* a slippy map.

Based on Eric Fischer's perceptually accurate color spectrum, using Tom MacWright's [JavaScript implementation](https://www.github.com/mapbox/fischer-color).

[See it in action.](http://requirebin.com/?gist=e8c0f4895deb1f295786)

## usage

``` js
d3.select('body')
    .append('div')
    .call(ColorPicker()
         .width(700)
         .height(500)
         .on('mouseup', function(c) { console.log(c) }));
             // or whatever you want to do with the hex color returned on click
```