動畫SVG圈（定時器和進度）

Question

我怎樣才能改變這種：

var el = document.getElementById('graph'); // get canvas 
 

 
var options = { 
 
    percent: el.getAttribute('data-percent') || 25, 
 
    size: el.getAttribute('data-size') || 220, 
 
    lineWidth: el.getAttribute('data-line') || 15, 
 
    rotate: el.getAttribute('data-rotate') || 0 
 
} 
 

 
var canvas = document.createElement('canvas'); 
 
var span = document.createElement('span'); 
 
span.textContent = options.percent + '%'; 
 
    
 
if (typeof(G_vmlCanvasManager) !== 'undefined') { 
 
    G_vmlCanvasManager.initElement(canvas); 
 
} 
 

 
var ctx = canvas.getContext('2d'); 
 
canvas.width = canvas.height = options.size; 
 

 
el.appendChild(span); 
 
el.appendChild(canvas); 
 

 
ctx.translate(options.size/2, options.size/2); // change center 
 
ctx.rotate((-1/2 + options.rotate/180) * Math.PI); // rotate -90 deg 
 

 
//imd = ctx.getImageData(0, 0, 240, 240); 
 
var radius = (options.size - options.lineWidth)/2; 
 

 
var drawCircle = function(color, lineWidth, percent) { 
 
\t \t percent = Math.min(Math.max(0, percent || 1), 1); 
 
\t \t ctx.beginPath(); 
 
\t \t ctx.arc(0, 0, radius, 0, Math.PI * 2 * percent, false); 
 
\t \t ctx.strokeStyle = color; 
 
     ctx.lineCap = 'round'; // butt, round or square 
 
\t \t ctx.lineWidth = lineWidth 
 
\t \t ctx.stroke(); 
 
}; 
 

 
drawCircle('#efefef', options.lineWidth, 100/100); 
 
drawCircle('#555555', options.lineWidth, options.percent/100);

div { 
 
    position:relative; 
 
    margin:80px; 
 
    width:220px; height:220px; 
 
} 
 
canvas { 
 
    display: block; 
 
    position:absolute; 
 
    top:0; 
 
    left:0; 
 
} 
 
span { 
 
    color:#555; 
 
    display:block; 
 
    line-height:220px; 
 
    text-align:center; 
 
    width:220px; 
 
    font-family:sans-serif; 
 
    font-size:40px; 
 
    font-weight:100; 
 
    margin-left:5px; 
 
} 
 

 
input { 
 
    width: 200px; 
 
}

<div class="chart" id="graph" data-percent="10"></div>

爲了得到這個：

外圓距離進度0至100％
內部定時器

我這樣做 而是通過屁股 http://codepen.io/di3orlive/pen/wKjBzY 我願做更多更好的 並用箭頭

Answer 1

var el = document.getElementById('graph'); // get canvas 
 

 
var options = { 
 
    percent: el.getAttribute('data-percent') || 25, 
 
    size: el.getAttribute('data-size') || 220, 
 
    lineWidth: el.getAttribute('data-line') || 4, 
 
    rotate: el.getAttribute('data-rotate') || 0 
 
} 
 

 
function Gauge() { 
 
    this.to_rad = to_rad = Math.PI/180; 
 
    this.percentBg = "#efefef"; 
 
    this.percentFg = "#555555"; 
 
    this.tickFg = "#cccccc"; 
 
    this.tickBg = "transparent"; 
 
    this.tickFill = true; 
 
    this.tickDirection = -1; // 1=clockwise, -1=counterclockewise 
 
    this.percent = 0; 
 
    this.size = 220; 
 
    this.lineWidth = 14; 
 
    this.rotate = 0; 
 
    this.ticks = 40; 
 
    this.tick = 0; 
 
    this.can = document.createElement('canvas'); 
 
    this.ctx = this.can.getContext('2d'); 
 
} 
 

 

 
Gauge.prototype.drawCircle = function(color, lineWidth, percent, drawArrow) { 
 
    var ctx = this.ctx; 
 
    var circleMargin = 10; // need room for arrowhead 
 
    var radius = (this.size - this.lineWidth - circleMargin)/2; 
 

 
    ctx.save(); 
 
    var mid = this.size/2; 
 
    ctx.translate(mid, mid); 
 
    ctx.rotate(-90 * to_rad); 
 
    percent = Math.min(Math.max(0, percent || 1), 1); 
 
    ctx.beginPath(); 
 
    var endRadians = 360 * percent * this.to_rad; 
 
    ctx.arc(0, 0, radius, 0, endRadians, false); 
 
    ctx.strokeStyle = ctx.filStyle = color; 
 
    ctx.lineCap = 'round'; // butt, round or square 
 
    ctx.lineWidth = lineWidth 
 
    ctx.stroke(); 
 

 
    if (drawArrow === true && percent !== 1) { 
 
    ctx.beginPath(); 
 
    ctx.rotate(endRadians); 
 

 
    var arrowWidth = this.lineWidth + 12; 
 
    var arrowHeight = 10; 
 
    ctx.moveTo(radius - (arrowWidth/2), 0); 
 
    ctx.lineTo(radius + (arrowWidth/2), 0); 
 
    ctx.lineTo(radius, arrowHeight); 
 
    ctx.fill(); 
 
    } 
 

 
    ctx.restore(); 
 
}; 
 

 
Gauge.prototype.drawTicks = function() { 
 
    var circleMargin = 10; // need room for arrowhead 
 
    var radius = (this.size - this.lineWidth - circleMargin)/2; 
 
    var ctx = this.ctx; 
 

 
    ctx.save(); 
 
    var mid = this.size/2; 
 
    ctx.translate(mid, mid); 
 
    ctx.rotate(-90 * to_rad); 
 
    ctx.lineWidth = 3; 
 

 
    var angle = 360/this.ticks; 
 
    var tickSize = 20; 
 
    var tickMargin = 10; 
 

 
    for (var i = 0; i < this.ticks; i++) { 
 
    if ((i < this.tick && this.tickFill == true) || i == this.tick) { 
 
     ctx.strokeStyle = this.tickFg; 
 
    } else { 
 
     ctx.strokeStyle = this.tickBg; 
 
    } 
 
    ctx.save(); 
 
    if (this.tickDirection === -1) { 
 
     ctx.rotate((360 - (i * angle)) * this.to_rad); 
 
    } else { 
 
     ctx.rotate(i * angle * this.to_rad); 
 
    } 
 
    ctx.beginPath(); 
 
    ctx.moveTo(radius - tickSize - tickMargin, 0); 
 
    ctx.lineTo(radius - tickMargin, 0); 
 
    ctx.stroke(); 
 
    ctx.restore(); 
 
    } 
 
    ctx.restore(); 
 
}; 
 

 
Gauge.prototype.render = function(el) { 
 
    this.can.width = this.can.height = this.size; 
 
    this.span = document.createElement('span'); 
 

 
    el.innerHTML = ""; 
 
    el.appendChild(this.can); 
 
    el.appendChild(this.span); 
 

 
    var self = this; 
 
    var ctx = self.ctx; 
 

 
    function loop() { 
 

 
    ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height); 
 
    self.drawCircle(self.percentBg, self.lineWidth, 100/100); 
 
    self.drawCircle(self.percentFg, self.lineWidth, self.percent/100, true); 
 
    self.drawTicks(); 
 
    self.timeout = setTimeout(function() { 
 
     loop() 
 
    }, 1000/30); 
 
    
 
    } 
 

 
    loop(); 
 
} 
 

 
var myGauge = new Gauge(); 
 

 
myGauge.size = options.size; 
 
myGauge.percent = options.percent; 
 
myGauge.lineWidth = options.lineWidth; 
 
myGauge.percent = options.percent; 
 
myGauge.render(el) 
 

 
var myGauge2 = new Gauge(); 
 

 
myGauge2.size = options.size; 
 
myGauge2.percent = options.percent; 
 
myGauge2.lineWidth = options.lineWidth; 
 
myGauge2.percent = options.percent; 
 
myGauge2.tickFg = "#FF8800"; 
 
myGauge2.tickBg = "#EEEEEE"; 
 
myGauge2.tickFill = false; 
 
myGauge2.ticks = 60; 
 
myGauge2.tickDirection = 1; 
 
myGauge2.render(document.getElementById('gauge')); 
 

 
var startTime = (new Date()).getTime(); 
 

 
var countDown = 99; 
 

 
function dataLoop() { 
 

 

 
    myGauge.percent = myGauge.percent > 100 ? 100 : (myGauge.percent * 1) + .1; 
 

 
    var elapsedMs = (new Date().getTime()) - startTime; // milliseconds; 
 
    var elapsedSec = elapsedMs/1000; 
 
    var remainSec = Math.floor(countDown - elapsedSec); 
 
    var progress = remainSec <=0 ? 1 : elapsedSec/countDown; 
 
    myGauge.tick = Math.floor(progress * myGauge.ticks); 
 
    myGauge.span.innerHTML = remainSec > 0 ? remainSec + " sec" : "---"; 
 
    
 
    var d = new Date(); 
 

 
    myGauge2.percent = (d.getMinutes()/60) * 100; 
 
    if (myGauge2.percent > 100) myGauge2.percent = 100; 
 
    myGauge2.tick = d.getSeconds(); 
 
    myGauge2.span.innerHTML = d.getSeconds() + " sec"; 
 
    setTimeout(dataLoop,1000/30); 
 
} 
 

 
dataLoop();

div { 
 
    position: relative; 
 
    margin: 80px; 
 
    width: 220px; 
 
    height: 220px; 
 
} 
 
canvas { 
 
    display: block; 
 
    position: absolute; 
 
    top: 0; 
 
    left: 0; 
 
} 
 
span { 
 
    color: #555; 
 
    display: block; 
 
    line-height: 220px; 
 
    text-align: center; 
 
    width: 100%; 
 
    font-family: sans-serif; 
 
    font-size: 40px; 
 
    font-weight: 100; 
 
    margin-left: 5px; 
 
} 
 
input { 
 
    width: 200px; 
 
}

<table> 
 
    <tr> 
 
    <td> 
 
     <div class="chart" id="graph" data-percent="10"></div> 
 
    </td> 
 
    <td> 
 
     <div id="gauge"></div> 
 
    </td> 
 
    </tr> 
 
</table>