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POHow can I add a marker to a donut chart created with Raphael.js?
 

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  1. POHow can I add a marker to a donut chart created with Raphael.js?
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    <p>I need help adding a marker to this donut chart script I've modified utilizing raphael.js. I've got most everything ready to go except for a way to dynamically generate a triangular marker. </p> <p>JSFiddle: <a href="http://jsfiddle.net/aP7MK/73/" rel="nofollow noreferrer">http://jsfiddle.net/aP7MK/73/</a></p> <pre><code>function donutChart(total, goal, avg){ var paper = Raphael("canvas", 400, 400); paper.customAttributes.arc = function (xloc, yloc, value, total, R) { var alpha = 360 / total * value, a = (90 - alpha) * Math.PI / 180, x = xloc + R * Math.cos(a), y = yloc - R * Math.sin(a), path; if (total == value) { path = [ ["M", xloc, yloc - R], ["A", R, R, 0, 1, 1, xloc - 0.01, yloc - R] ]; } else { path = [ ["M", xloc, yloc - R], ["A", R, R, 0, +(alpha &gt; 180), 1, x, y] ]; } return { path: path }; }; var backCircle = paper.circle(100, 100, 40).attr({ "stroke": "#7BC2E5", "stroke-width": 14 }); var theArc = paper.path().attr({ "stroke": "#f5f5f5", "stroke-width": 14, arc: [100, 100, 0, 100, 40] }); //event fired on each animation frame eve.on("raphael.anim.frame.*", onAnimate); //text in the middle theText = paper.text(100, 100, "0%").attr({ "font-size": 18, "fill": "#f5f5f5", "font-weight": "bold" }); //the animated arc theArc.rotate(0, 100, 100).animate({ arc: [100, 100, ((total/goal) * 100), 100, 40] }, 1900); //on each animation frame we change the text in the middle function onAnimate() { var howMuch = theArc.attr("arc"); theText.attr("text", Math.floor(howMuch[2]) + "%"); } } donutChart(80, 140, 40); </code></pre> <p>Here's what I'm eventually trying to create:</p> <p><img src="https://i.stack.imgur.com/m8KTh.gif" alt=""></p> <p>I'm not worried about the styling, just need help with the marker element, which will denote where the avg argument being passed to the donutChart function lies within the chart.</p>
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      1. POHow can I add a marker to a donut chart created with Raphael.js?
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    1. COCould you use var tri = paper.path("M100,100,130,100,100,130z"); and then rotate/translate it depending on howMuch or something ?
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    2. COHey @Ian - Sorry, I should've clarified that I don't really have any experience with generating SVGs. I found the code above within another SO question and modified it slightly to be more along the lines of what I'm looking for, but as for drawing and generating paths I have no idea where to start. Any chance you could try updating the example on fiddle with your suggestion?
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