Created
November 10, 2013 21:35
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HTML5を使って，時計を書く
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| (function () { | |
| $("document").ready(init); | |
| var canvas; | |
| var context; | |
| var centerX; | |
| var centerY; | |
| var r; | |
| var LINEWIDTH = 2; | |
| var step = 0; | |
| var dialTimer; | |
| var onOff = false; | |
| function init() { | |
| $("#button").click(toggleDial); | |
| canvas = document.getElementById("hangman"); | |
| context = canvas.getContext("2d"); | |
| context.lineWidth = LINEWIDTH; | |
| centerX = canvas.width / 2; | |
| centerY = canvas.height / 2; | |
| r = canvas.height / 2 * 4 / 5; | |
| clearCanvas(); | |
| drawCircle(); | |
| drawLine(0); | |
| drawFont(); | |
| } | |
| var toggleDial = (function() { | |
| var on = function() { | |
| clearCanvas(); | |
| drawCircle(); | |
| drawFont(); | |
| step = (step + 1) % 60; | |
| drawLine(step); | |
| dialTimer = setTimeout(on, 10); | |
| onOff = true; | |
| }; | |
| var off = function() { | |
| clearTimeout(dialTimer); | |
| onOff = false; | |
| }; | |
| return function() { | |
| if (!onOff) { | |
| on(); | |
| } else { | |
| off(); | |
| } | |
| }; | |
| })(); | |
| var clearCanvas = function() { | |
| context.clearRect(0, 0, canvas.width, canvas.height); | |
| }; | |
| var drawCircle = function() { | |
| context.beginPath(); | |
| context.arc(centerX, centerY, r, 0, Math.PI*2, false); | |
| context.stroke(); | |
| }; | |
| var drawFont = function() { | |
| context.beginPath(); | |
| context.font ="20px sans-selif"; | |
| context.textAlign = "center"; | |
| context.textBaseline = "middle"; | |
| var one_step_rad = 2 * Math.PI / 12; | |
| var start_rad = Math.PI / 2; | |
| for (var i = 1; i <= 12; i++ ) { | |
| var rad = start_rad - one_step_rad * i; | |
| context.strokeText(i, | |
| centerX + ( (r - 20) * (Math.cos(rad))), | |
| centerY + (-((r - 20) * (Math.sin(rad))))); | |
| } | |
| context.stroke(); | |
| }; | |
| var drawLine = function(step) { | |
| var one_step_rad = 2 * Math.PI / 60; | |
| var start_rad = Math.PI / 2; | |
| var rad = start_rad - one_step_rad * step; | |
| context.beginPath(); | |
| context.moveTo(centerX, centerY); | |
| context.lineTo( | |
| centerX + ( (r - 5) * (Math.cos(rad))), | |
| centerY + (-((r - 5) * (Math.sin(rad))))); | |
| context.stroke(); | |
| } | |
| })(); |
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| <!DOCTYPE html> | |
| <html lang="ja"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>dial</title> | |
| <script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script> | |
| <script src="dial.js"></script> | |
| </head> | |
| <body> | |
| <canvas id="dial" width="400" height="400"></canvas> | |
| <input id="button" type="button"/> | |
| </body> | |
| </html> | |
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