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HTML5 Canvas: Lunch Wheel - javascript 룰렛
blog.bramp.net/post/2011/07/27/html5-canvas-lunch-wheel/
HTML5 Canvas: Lunch Wheel
In the on going battle to make my lunch time more optimised I decided to learn some Javascript, and how to use the HTML5 Canvas element. Turns out it’s not that hard, and I have now created Click to …
blog.bramp.net
Lunch Wheel
blog.bramp.net
<html><head>
<meta content="IE=EmulateIE7" http-equiv="X-UA-Compatible">
<title>Lunch Wheel</title>
<link href="https://cdnjs.cloudflare.com/ajax/libs/meyer-reset/2.0/reset.css" rel="stylesheet" type="text/css">
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>
<script type="text/javascript" src="jquery.tinysort.min.js"></script>
<!--[if IE]><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jit/2.0.2/Extras/excanvas.min.js"></script><![endif]-->
<script type="text/javascript">
// Helpers
shuffle = function(o) {
for ( var j, x, i = o.length; i; j = parseInt(Math.random() * i), x = o[--i], o[i] = o[j], o[j] = x)
;
return o;
};
String.prototype.hashCode = function(){
// See http://www.cse.yorku.ca/~oz/hash.html
var hash = 5381;
for (i = 0; i < this.length; i++) {
char = this.charCodeAt(i);
hash = ((hash<<5)+hash) + char;
hash = hash & hash; // Convert to 32bit integer
}
return hash;
}
Number.prototype.mod = function(n) {
return ((this%n)+n)%n;
}
</script>
<script type="text/javascript">
venues = {
"116208" : "Jerry's Subs and Pizza",
"66271" : "Starbucks",
"5518" : "Ireland's Four Courts",
"392360" : "Five Guys",
"2210952" : "Uptown Cafe",
"207306" : "Corner Bakery Courthouse",
"41457" : "Delhi Dhaba",
"101161" : "TNR Cafe",
"257424" : "Afghan Kabob House",
"512060" : "The Perfect Pita",
"66244" : "California Tortilla",
"352867" : "Pho 75 - Rosslyn",
"22493" : "Ragtime",
"268052" : "Subway",
"5665" : "Summers Restaurant & Sports Bar",
"129724" : "Cosi",
"42599" : "Ray's Hell Burger"
};
$(function() {
var venueContainer = $('#venues ul');
$.each(venues, function(key, item) {
venueContainer.append(
$(document.createElement("li"))
.append(
$(document.createElement("input")).attr({
id: 'venue-' + key
,name: item
,value: item
,type: 'checkbox'
,checked:true
})
.change( function() {
var cbox = $(this)[0];
var segments = wheel.segments;
var i = segments.indexOf(cbox.value);
if (cbox.checked && i == -1) {
segments.push(cbox.value);
} else if ( !cbox.checked && i != -1 ) {
segments.splice(i, 1);
}
segments.sort();
wheel.update();
} )
).append(
$(document.createElement('label')).attr({
'for': 'venue-' + key
})
.text( item )
)
)
});
$('#venues ul>li').tsort("input", {attr: "value"});
});
</script>
<script type="text/javascript">
// WHEEL!
var wheel = {
timerHandle : 0,
timerDelay : 33,
angleCurrent : 0,
angleDelta : 0,
size : 290,
canvasContext : null,
colors : [ '#ffff00', '#ffc700', '#ff9100', '#ff6301', '#ff0000', '#c6037e',
'#713697', '#444ea1', '#2772b2', '#0297ba', '#008e5b', '#8ac819' ],
//segments : [ 'Andrew', 'Bob', 'Fred', 'John', 'China', 'Steve', 'Jim', 'Sally', 'Andrew', 'Bob', 'Fred', 'John', 'China', 'Steve', 'Jim'],
segments : [],
seg_colors : [], // Cache of segments to colors
maxSpeed : Math.PI / 16,
upTime : 1000, // How long to spin up for (in ms)
downTime : 17000, // How long to slow down for (in ms)
spinStart : 0,
frames : 0,
centerX : 300,
centerY : 300,
spin : function() {
// Start the wheel only if it's not already spinning
if (wheel.timerHandle == 0) {
wheel.spinStart = new Date().getTime();
wheel.maxSpeed = Math.PI / (16 + Math.random()); // Randomly vary how hard the spin is
wheel.frames = 0;
wheel.sound.play();
wheel.timerHandle = setInterval(wheel.onTimerTick, wheel.timerDelay);
}
},
onTimerTick : function() {
wheel.frames++;
wheel.draw();
var duration = (new Date().getTime() - wheel.spinStart);
var progress = 0;
var finished = false;
if (duration < wheel.upTime) {
progress = duration / wheel.upTime;
wheel.angleDelta = wheel.maxSpeed
* Math.sin(progress * Math.PI / 2);
} else {
progress = duration / wheel.downTime;
wheel.angleDelta = wheel.maxSpeed
* Math.sin(progress * Math.PI / 2 + Math.PI / 2);
if (progress >= 1)
finished = true;
}
wheel.angleCurrent += wheel.angleDelta;
while (wheel.angleCurrent >= Math.PI * 2)
// Keep the angle in a reasonable range
wheel.angleCurrent -= Math.PI * 2;
if (finished) {
clearInterval(wheel.timerHandle);
wheel.timerHandle = 0;
wheel.angleDelta = 0;
$("#counter").html((wheel.frames / duration * 1000) + " FPS");
}
/*
// Display RPM
var rpm = (wheel.angleDelta * (1000 / wheel.timerDelay) * 60) / (Math.PI * 2);
$("#counter").html( Math.round(rpm) + " RPM" );
*/
},
init : function(optionList) {
try {
wheel.initWheel();
wheel.initAudio();
wheel.initCanvas();
wheel.draw();
$.extend(wheel, optionList);
} catch (exceptionData) {
alert('Wheel is not loaded ' + exceptionData);
}
},
initAudio : function() {
var sound = document.createElement('audio');
sound.setAttribute('src', 'wheel.mp3');
wheel.sound = sound;
},
initCanvas : function() {
var canvas = $('#wheel #canvas').get(0);
if ($.browser.msie) {
canvas = document.createElement('canvas');
$(canvas).attr('width', 1000).attr('height', 600).attr('id', 'canvas').appendTo('.wheel');
canvas = G_vmlCanvasManager.initElement(canvas);
}
canvas.addEventListener("click", wheel.spin, false);
wheel.canvasContext = canvas.getContext("2d");
},
initWheel : function() {
shuffle(wheel.colors);
},
// Called when segments have changed
update : function() {
// Ensure we start mid way on a item
//var r = Math.floor(Math.random() * wheel.segments.length);
var r = 0;
wheel.angleCurrent = ((r + 0.5) / wheel.segments.length) * Math.PI * 2;
var segments = wheel.segments;
var len = segments.length;
var colors = wheel.colors;
var colorLen = colors.length;
// Generate a color cache (so we have consistant coloring)
var seg_color = new Array();
for (var i = 0; i < len; i++)
seg_color.push( colors [ segments[i].hashCode().mod(colorLen) ] );
wheel.seg_color = seg_color;
wheel.draw();
},
draw : function() {
wheel.clear();
wheel.drawWheel();
wheel.drawNeedle();
},
clear : function() {
var ctx = wheel.canvasContext;
ctx.clearRect(0, 0, 1000, 800);
},
drawNeedle : function() {
var ctx = wheel.canvasContext;
var centerX = wheel.centerX;
var centerY = wheel.centerY;
var size = wheel.size;
ctx.lineWidth = 1;
ctx.strokeStyle = '#000000';
ctx.fileStyle = '#ffffff';
ctx.beginPath();
ctx.moveTo(centerX + size - 40, centerY);
ctx.lineTo(centerX + size + 20, centerY - 10);
ctx.lineTo(centerX + size + 20, centerY + 10);
ctx.closePath();
ctx.stroke();
ctx.fill();
// Which segment is being pointed to?
var i = wheel.segments.length - Math.floor((wheel.angleCurrent / (Math.PI * 2)) * wheel.segments.length) - 1;
// Now draw the winning name
ctx.textAlign = "left";
ctx.textBaseline = "middle";
ctx.fillStyle = '#000000';
ctx.font = "2em Arial";
ctx.fillText(wheel.segments[i], centerX + size + 25, centerY);
},
drawSegment : function(key, lastAngle, angle) {
var ctx = wheel.canvasContext;
var centerX = wheel.centerX;
var centerY = wheel.centerY;
var size = wheel.size;
var segments = wheel.segments;
var len = wheel.segments.length;
var colors = wheel.seg_color;
var value = segments[key];
ctx.save();
ctx.beginPath();
// Start in the centre
ctx.moveTo(centerX, centerY);
ctx.arc(centerX, centerY, size, lastAngle, angle, false); // Draw a arc around the edge
ctx.lineTo(centerX, centerY); // Now draw a line back to the centre
// Clip anything that follows to this area
//ctx.clip(); // It would be best to clip, but we can double performance without it
ctx.closePath();
ctx.fillStyle = colors[key];
ctx.fill();
ctx.stroke();
// Now draw the text
ctx.save(); // The save ensures this works on Android devices
ctx.translate(centerX, centerY);
ctx.rotate((lastAngle + angle) / 2);
ctx.fillStyle = '#000000';
ctx.fillText(value.substr(0, 20), size / 2 + 20, 0);
ctx.restore();
ctx.restore();
},
drawWheel : function() {
var ctx = wheel.canvasContext;
var angleCurrent = wheel.angleCurrent;
var lastAngle = angleCurrent;
var segments = wheel.segments;
var len = wheel.segments.length;
var colors = wheel.colors;
var colorsLen = wheel.colors.length;
var centerX = wheel.centerX;
var centerY = wheel.centerY;
var size = wheel.size;
var PI2 = Math.PI * 2;
ctx.lineWidth = 1;
ctx.strokeStyle = '#000000';
ctx.textBaseline = "middle";
ctx.textAlign = "center";
ctx.font = "1.4em Arial";
for (var i = 1; i <= len; i++) {
var angle = PI2 * (i / len) + angleCurrent;
wheel.drawSegment(i - 1, lastAngle, angle);
lastAngle = angle;
}
// Draw a center circle
ctx.beginPath();
ctx.arc(centerX, centerY, 20, 0, PI2, false);
ctx.closePath();
ctx.fillStyle = '#ffffff';
ctx.strokeStyle = '#000000';
ctx.fill();
ctx.stroke();
// Draw outer circle
ctx.beginPath();
ctx.arc(centerX, centerY, size, 0, PI2, false);
ctx.closePath();
ctx.lineWidth = 10;
ctx.strokeStyle = '#000000';
ctx.stroke();
},
}
window.onload = function() {
wheel.init();
var segments = new Array();
$.each($('#venues input:checked'), function(key, cbox) {
segments.push( cbox.value );
});
wheel.segments = segments;
wheel.update();
// Hide the address bar (for mobile devices)!
setTimeout(function() {
window.scrollTo(0, 1);
}, 0);
}
</script>
</head>
<body>
<div id="venues" style="float:left"><ul><li><input id="venue-257424" name="Afghan Kabob House" value="Afghan Kabob House" type="checkbox" checked="checked"><label for="venue-257424">Afghan Kabob House</label></li><li><input id="venue-66244" name="California Tortilla" value="California Tortilla" type="checkbox" checked="checked"><label for="venue-66244">California Tortilla</label></li><li><input id="venue-207306" name="Corner Bakery Courthouse" value="Corner Bakery Courthouse" type="checkbox" checked="checked"><label for="venue-207306">Corner Bakery Courthouse</label></li><li><input id="venue-129724" name="Cosi" value="Cosi" type="checkbox" checked="checked"><label for="venue-129724">Cosi</label></li><li><input id="venue-41457" name="Delhi Dhaba" value="Delhi Dhaba" type="checkbox" checked="checked"><label for="venue-41457">Delhi Dhaba</label></li><li><input id="venue-392360" name="Five Guys" value="Five Guys" type="checkbox" checked="checked"><label for="venue-392360">Five Guys</label></li><li><input id="venue-5518" name="Ireland's Four Courts" value="Ireland's Four Courts" type="checkbox" checked="checked"><label for="venue-5518">Ireland's Four Courts</label></li><li><input id="venue-116208" name="Jerry's Subs and Pizza" value="Jerry's Subs and Pizza" type="checkbox" checked="checked"><label for="venue-116208">Jerry's Subs and Pizza</label></li><li><input id="venue-352867" name="Pho 75 - Rosslyn" value="Pho 75 - Rosslyn" type="checkbox" checked="checked"><label for="venue-352867">Pho 75 - Rosslyn</label></li><li><input id="venue-22493" name="Ragtime" value="Ragtime" type="checkbox" checked="checked"><label for="venue-22493">Ragtime</label></li><li><input id="venue-42599" name="Ray's Hell Burger" value="Ray's Hell Burger" type="checkbox" checked="checked"><label for="venue-42599">Ray's Hell Burger</label></li><li><input id="venue-66271" name="Starbucks" value="Starbucks" type="checkbox" checked="checked"><label for="venue-66271">Starbucks</label></li><li><input id="venue-268052" name="Subway" value="Subway" type="checkbox" checked="checked"><label for="venue-268052">Subway</label></li><li><input id="venue-5665" name="Summers Restaurant & Sports Bar" value="Summers Restaurant & Sports Bar" type="checkbox" checked="checked"><label for="venue-5665">Summers Restaurant & Sports Bar</label></li><li><input id="venue-512060" name="The Perfect Pita" value="The Perfect Pita" type="checkbox" checked="checked"><label for="venue-512060">The Perfect Pita</label></li><li><input id="venue-101161" name="TNR Cafe" value="TNR Cafe" type="checkbox" checked="checked"><label for="venue-101161">TNR Cafe</label></li><li><input id="venue-2210952" name="Uptown Cafe" value="Uptown Cafe" type="checkbox" checked="checked"><label for="venue-2210952">Uptown Cafe</label></li></ul></div>
<div id="wheel">
<canvas height="600" id="canvas" width="1000"></canvas>
</div>
<div id="stats">
<div id="counter">30.278136368970777 FPS</div>
</div>
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