aurelia-materialize-bridge/src/common/shade-blend-convert.ts

Aurelia interface to http://materializecss.com/

// http://stackoverflow.com/questions/5560248/programmatically-lighten-or-darken-a-hex-color-or-rgb-and-blend-colors
// tslint:disable
export function shadeBlendConvert(p: number, from: string, to?: string) {
	if (typeof (p) != "number" || p < -1 || p > 1 || typeof (from) != "string" || (from[0] != 'r' && from[0] != '#') || (typeof (to) != "string" && typeof (to) != "undefined")) {
		return null; //ErrorCheck
	}
	let sbcRip = function(d: any) {
		var l = d.length, RGB = new Object();
		if (l > 9) {
			d = d.split(",");
			if (d.length < 3 || d.length > 4) return null;//ErrorCheck
			RGB[0] = i(d[0].slice(4)), RGB[1] = i(d[1]), RGB[2] = i(d[2]), RGB[3] = d[3] ? parseFloat(d[3]) : -1;
		} else {
			switch (l) { case 8: case 6: case 3: case 2: case 1: return null; } //ErrorCheck
			if (l < 6) d = "#" + d[1] + d[1] + d[2] + d[2] + d[3] + d[3] + (l > 4 ? d[4] + "" + d[4] : ""); //3 digit
			d = i(d.slice(1), 16), RGB[0] = d >> 16 & 255, RGB[1] = d >> 8 & 255, RGB[2] = d & 255, RGB[3] = l == 9 || l == 5 ? r(((d >> 24 & 255) / 255) * 10000) / 10000 : -1;
		}
		return RGB;
	}
	var i = parseInt, r = Math.round, h = from.length > 9, h = typeof (to) == "string" ? to.length > 9 ? true : to == "c" ? !h : false : h, b = p < 0, p = b ? p * -1 : p, to = to && to != "c" ? to : b ? "#000000" : "#FFFFFF", f = sbcRip(from), t = sbcRip(to);
	if (!f || !t) return null; //ErrorCheck
	if (h) return "rgb(" + r((t[0] - f[0]) * p + f[0]) + "," + r((t[1] - f[1]) * p + f[1]) + "," + r((t[2] - f[2]) * p + f[2]) + (f[3] < 0 && t[3] < 0 ? ")" : "," + (f[3] > -1 && t[3] > -1 ? r(((t[3] - f[3]) * p + f[3]) * 10000) / 10000 : t[3] < 0 ? f[3] : t[3]) + ")");
	else return "#" + (0x100000000 + (f[3] > -1 && t[3] > -1 ? r(((t[3] - f[3]) * p + f[3]) * 255) : t[3] > -1 ? r(t[3] * 255) : f[3] > -1 ? r(f[3] * 255) : 255) * 0x1000000 + r((t[0] - f[0]) * p + f[0]) * 0x10000 + r((t[1] - f[1]) * p + f[1]) * 0x100 + r((t[2] - f[2]) * p + f[2])).toString(16).slice(f[3] > -1 || t[3] > -1 ? 1 : 3);
}
// tslint:enable