Created
August 6, 2016 02:24
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Analog Clock
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| /* | |
| Video Guide: https://youtu.be/1q7EEd6Huf0 | |
| */ | |
| let canvas, ctx; | |
| function draw () { | |
| let time = (function () { | |
| let midnight = new Date(); | |
| midnight.setHours(0); | |
| midnight.setMinutes(0); | |
| midnight.setSeconds(0); | |
| midnight.setMilliseconds(0); | |
| return Date.now() - midnight.getTime(); | |
| })(), | |
| hours = time / (60 * 60 * 1000), | |
| minutes = hours * 60 % 60, | |
| seconds = minutes * 60 % 60, | |
| c = {x: canvas.width / 2, y: canvas.height / 2}; | |
| ctx.clearRect(0, 0, canvas.width, canvas.height); | |
| ctx.lineCap = 'round'; | |
| secondHand(); | |
| minuteHand(); | |
| hourHand(); | |
| face(); | |
| function face () { | |
| // Border | |
| ctx.lineWidth = 5; | |
| ctx.strokeStyle = 'black'; | |
| ctx.beginPath(); | |
| ctx.arc(c.x, c.y, 140, 0, Math.PI * 2); | |
| ctx.stroke(); | |
| // Dashes | |
| ctx.lineWidth = 3; | |
| for (let i = 0; i < 60; i++) { | |
| let r = 135, | |
| l = 5; | |
| ctx.strokeStyle = 'rgba(0, 0, 0, 0.25)'; | |
| if (i % 5 === 0) | |
| r -= l, | |
| l *= 2, | |
| ctx.strokeStyle = 'rgba(0, 0, 0, 0.5)'; | |
| let v = new Vector(r, Math.PI * 2 * (i / 60) - Math.PI / 2); | |
| ctx.beginPath(); | |
| ctx.moveTo(v.getX() + c.x, v.getY() + c.y); | |
| v.setMag(r + l); | |
| ctx.lineTo(v.getX() + c.x, v.getY() + c.y); | |
| ctx.stroke(); | |
| } | |
| // Numbers | |
| ctx.font = '18px Noto Sans'; | |
| ctx.fillStyle = 'black'; | |
| ctx.textAlign = 'center'; | |
| ctx.textBaseline = 'middle'; | |
| for (let i = 1; i <= 12; i++) { | |
| let v = new Vector(113, Math.PI * 2 * (i / 12) - Math.PI / 2); | |
| ctx.fillText(i, v.getX() + c.x, v.getY() + c.y); | |
| } | |
| // Center button | |
| ctx.beginPath(); | |
| ctx.arc(c.x, c.y, 3.75, 0, Math.PI * 2); | |
| ctx.fillStyle = 'white'; | |
| ctx.strokeStyle = 'black'; | |
| ctx.lineWidth = 2.5; | |
| ctx.fill(); | |
| ctx.stroke(); | |
| } | |
| function secondHand () { | |
| ctx.lineWidth = 1.5; | |
| ctx.strokeStyle = 'black'; | |
| ctx.beginPath(); | |
| let a = Math.PI * 2 * (seconds / 60) - Math.PI / 2; | |
| let v = new Vector(95, a); | |
| let v2 = new Vector(-20, a); | |
| ctx.moveTo(v2.getX() + c.x, v2.getY() + c.y); | |
| ctx.lineTo(v.getX() + c.x, v.getY() + c.y); | |
| ctx.stroke(); | |
| } | |
| function minuteHand () { | |
| ctx.lineWidth = 4; | |
| ctx.strokeStyle = 'black'; | |
| ctx.beginPath(); | |
| let a = Math.PI * 2 * (minutes / 60) - Math.PI / 2; | |
| let v = new Vector(95, a); | |
| ctx.moveTo(c.x, c.y); | |
| ctx.lineTo(v.getX() + c.x, v.getY() + c.y); | |
| ctx.stroke(); | |
| } | |
| function hourHand () { | |
| ctx.lineWidth = 4; | |
| ctx.strokeStyle = 'black'; | |
| ctx.beginPath(); | |
| let a = Math.PI * 2 * (hours / 12) - Math.PI / 2; | |
| let v = new Vector(60, a); | |
| ctx.moveTo(c.x, c.y); | |
| ctx.lineTo(v.getX() + c.x, v.getY() + c.y); | |
| ctx.stroke(); | |
| } | |
| } | |
| function init () { | |
| canvas = document.getElementById('clock'); | |
| canvas.width = canvas.height = 300; | |
| ctx = canvas.getContext('2d'); | |
| setInterval(draw, 10); | |
| } | |
| init(); |
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| <!-- | |
| Video Guide: https://youtu.be/1q7EEd6Huf0 | |
| --> | |
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Analog Clock</title> | |
| </head> | |
| <body> | |
| <canvas id="clock"></canvas> | |
| <script src="Vector.js"></script> | |
| <script src="clock.js"></script> | |
| </body> | |
| </html> |
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| /* | |
| Video Guide: https://youtu.be/1q7EEd6Huf0 | |
| */ | |
| function Vector (magnitude, angle) { | |
| var m, a; | |
| this.getX = function () { | |
| return m * Math.cos(a); | |
| }; | |
| this.setX = function (x) { | |
| var y = m * Math.sin(a); | |
| m = Math.sqrt((x * x) + (y * y)); | |
| a = Math.atan2(y, x); | |
| }; | |
| this.getY = function () { | |
| return m * Math.sin(a); | |
| }; | |
| this.setY = function (y) { | |
| var x = m * Math.cos(a); | |
| m = Math.sqrt((x * x) + (y * y)); | |
| a = Math.atan2(y, x); | |
| }; | |
| this.getMag = function () { | |
| return m; | |
| }; | |
| this.setMag = function (magnitude) { | |
| m = magnitude; | |
| }; | |
| this.getAngle = function () { | |
| return a; | |
| }; | |
| this.setAngle = function (angle) { | |
| a = angle; | |
| }; | |
| this.add = function (v) { | |
| return Vector.add(this, v); | |
| }; | |
| this.subtract = function (v) { | |
| return Vector.subtract(this, v); | |
| }; | |
| this.setMag(magnitude); | |
| this.setAngle(angle); | |
| } | |
| Vector.rectangular = function (x, y) { | |
| var m = Math.sqrt(x * x + y * y), | |
| a = Math.atan2(y, x); | |
| return new Vector(m, a); | |
| }; | |
| Vector.polar = function (m, a) { | |
| return new Vector(m, a); | |
| }; | |
| Vector.add = function (v1, v2) { | |
| return Vector.rectangular(v1.getX() + v2.getX(), v1.getY() + v2.getY()); | |
| }; | |
| Vector.subtract = function (v1, v2) { | |
| return Vector.rectangular(v1.getX() - v2.getX(), v1.getY() - v2.getY()); | |
| }; |
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