time-radians

Convert hours/minutes/seconds to clock hand angles.

Install

$ npm install --save time-radians

Usage

let timeRadians = require('time-radians');

let now = new Date();

let hoursAngle = timeRadians.hoursHand(now.getHours(), now.getMinutes(), now.getSeconds());
let minutesAngle = timeRadians.minutesHand(now.getMinutes(), now.getSeconds());
let secondsAngle = timeRadians.secondsHand(now.getSeconds());

// render clock

API

let timeRadians = require('time-radians');

timeRadians.hoursHand(hours, minutes = 0, seconds = 0)

Hours can be 12-hour or 24-hour.

Returns angle for hours hand, in radians.

timeRadians.minutesHand(minutes, seconds = 0)

Returns angle for minutes hand, in radians.

timeRadians.secondsHand(seconds)

Returns angle for seconds hand, in radians.

Rendering tip

Assuming your clock's center looks like

var center = {
  x: 100,
  y: 200
};

use this to figure out where to render clock hands

function endPoint(center, length, radians) {
  return {
    x: center.x + (length * Math.cos(radians)),
    y: center.y - (length * Math.sin(radians))
  };
}

License

MIT