Merge pull request #8 from btmills/issue7

Expose color on Pattern object (fixes #7)

README.md

@@ -56,6 +56,14 @@ Returns a newly-generated, tiling SVG Pattern.
 
 - `options.generator` Determines the pattern. [All of the original patterns](https://github.com/jasonlong/geo_pattern#available-patterns) are available in this port, and their names are camelCased.
 
+#### Pattern.color
+
+Gets the pattern's background color as a hexadecimal string.
+
+```js
+GeoPattern.generate('GitHub').color // => "#455e8a"
+```
+
 #### Pattern.toString() and Pattern.toSvg()
 
 Gets the SVG string representing the pattern.

lib/color.js

@@ -24,6 +24,17 @@ function hex2rgb(hex) {
 	} : null;
 }
 
+/**
+ * Converts an RGB color value to a hex string.
+ * @param  Object rgb RGB as r, g, and b keys
+ * @return String     Hex color string
+ */
+function rgb2hex(rgb) {
+	return '#' + ['r', 'g', 'b'].map(function (key) {
+		return rgb[key].toString(16);
+	}).join('');
+}
+
 /**
  * Converts an RGB color value to HSL. Conversion formula adapted from
  * http://en.wikipedia.org/wiki/HSL_color_space. This function adapted
@@ -100,6 +111,7 @@ function hsl2rgb(hsl) {
 
 module.exports = {
 	hex2rgb: hex2rgb,
+	rgb2hex: rgb2hex,
 	rgb2hsl: rgb2hsl,
 	hsl2rgb: hsl2rgb,
 	rgb2rgbString: function (rgb) {

lib/pattern.js

@@ -134,6 +134,8 @@ Pattern.prototype.generateBackground = function () {
 		rgb = color.hsl2rgb(baseColor);
 	}
 
+	this.color = color.rgb2hex(rgb);
+
 	this.svg.rect(0, 0, '100%', '100%', {
 		fill: color.rgb2rgbString(rgb)
 	});