olliejs/lib/toolbelt.js

A javascript (node.js) API to control Ollie with Noble

var COLORS = exports.COLORS = {
	BLACK:  0x000000,
	BLUE:   0x0000ff,
	GREEN:  0x00ff00,
	ORANGE: 0xff4500,
	PINK:   0xff1444,
	PURPLE: 0xff00ff,
	RED:    0xff0000,
	WHITE:  0xffffff,
	YELLOW: 0xffff00
};

/**
 * An array of primary colours
 * @type {Array}
 */
var COLORS_PRIMARY = exports.COLORS_PRIMARY = [
	COLORS.RED, COLORS.GREEN, COLORS.BLUE
];

/**
 * Select a random primary colour
 *
 * @returns {*}
 */
exports.randomPrimary = function() {
	var index = Math.floor(Math.random()*COLORS_PRIMARY.length);
	return COLORS_PRIMARY[index];
};

/**
 * Select a random colour across the whole colour space
 *
 * @returns {number}
 */
exports.randomColor = function() {
	var r = Math.random()*255;
	var g = Math.random()*255;
	var b = Math.random()*255;
	var color = (r << 16) | (g << 8) | b;
	return color;
};

/**
 * Determine the colour between a start and end colour given a position between them.
 *
 * @param startColor
 * @param endColor
 * @param position A float between 0 and 1 where 0=start colour and 1=end colour
 * @returns {number}
 */
exports.colorStop = function(startColor, endColor, position) {
	if (position < 0 ) {
		position = 0;
	}
	if (position > 1) {
		position = 1;
	}
	var redStart = (startColor & 0xFF0000) >> 16;
	var redEnd = (endColor & 0xFF0000) >> 16;
	var redRange = redEnd-redStart;
	var greenStart = (startColor & 0x00FF00) >> 8;
	var greenEnd = (endColor & 0x00FF00) >> 8;
	var greenRange = greenEnd-greenStart;
	var blueStart = startColor & 0x0000FF;
	var blueEnd = endColor & 0x0000FF;
	var blueRange = blueEnd-blueStart;

	var newRed = redStart + Math.round((redRange) * position);
	var newGreen = greenStart + Math.round((greenRange) * position);
	var newBlue = blueStart + Math.round((blueRange) * position);

	var newColor = (newRed << 16) | (newGreen << 8) | newBlue;

	return newColor;
};

exports.calculateChecksum = function(aBuffer) {
	var calculatedChecksum = 0;
	for (var _i = 0; _i < aBuffer.length; _i++) {
		calculatedChecksum += aBuffer.readUInt8(_i);
	}
	calculatedChecksum = calculatedChecksum & 0xFF ^ 0xFF;
	return calculatedChecksum;
};

exports.createPacket = function(did, cid, options) {
	var _packet = {};
	for (var _i in options) {
		if (options.hasOwnProperty(_i)) {
			_packet[_i] = options[_i];
		}
	}
	_packet.DID = did;
	_packet.CID = cid;

	return _packet;
};


exports.bufferToArray = function(buffer) {
	var DATA = [];
	for (var i = JSON.parse(JSON.stringify(buffer)).data.length - 1; i >= 0; i--) {
		DATA[i] = JSON.parse(JSON.stringify(buffer)).data[i].toString(16);
		if (DATA[i].length === 1) { //zero padding
			DATA[i] = "0".concat(DATA[i]);
		}
	};
	return DATA;
}

exports.bufferArrayToDecimal = function(array) {
	var hex = "";
	for (var i = 0; i < array.length; i++) {
		hex = hex + array[i];
	};
	var decimal = parseInt(hex,16);
	return decimal;
}