After spending several hours working on it, I'm struggling to draw my donut graph with JavaScript. Can anyone provide a solution? I am looking for a way to add 25% when one checkbox is selected and +25% when two checkboxes are selected. Thank you in advance.
give this a shot:
JavaScript:
$(document).ready(function () {
var el = document.getElementById('graph'); // access 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); // adjust 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) {
percent = Math.min(Math.max(0, percent || 1), 1);
ctx.beginPath();
ctx.arc(0, 0, radius, 0, Math.PI * 2 * percent, false);
ctx.strokeStyle = color;
ctx.lineCap = 'round'; // butt, round or square
ctx.lineWidth = lineWidth
ctx.stroke();
};
drawCircle('#efefef', options.lineWidth, 100 / 100);
drawCircle('#555555', options.lineWidth, options.percent / 100);
$(".chkBox").on("click", function(){
var dp = parseFloat($("#graph").attr("data-percent"));
if($(this).is(":checked")){
$("#graph").attr("data-percent", dp + 25);
}else{
$("#graph").attr("data-percent", dp - 25);
}
span.textContent = parseFloat($("#graph").attr("data-percent")) + '%';
console.log($("#graph").attr("data-percent"));
drawCircle('#efefef', options.lineWidth, 100 / 100);
drawCircle('#555555', options.lineWidth, parseFloat($("#graph").attr("data-percent")) / 100);
});
});
HTML:
<div class="chart" id="graph" data-percent="0"></div>
<label for="id_1">A</label>
<input type="checkbox" class="chkBox" id="id_1" /><br/>
<label for="id_2">B</label>
<input type="checkbox" class="chkBox" id="id_2" /><br/>
<label for="id_3">C</label>
<input type="checkbox" class="chkBox" id="id_3" /><br/>
<label for="id_4">D</label>
<input type="checkbox" class="chkBox" id="id_4" />
CSS:
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;
}
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