svg - use d3.js to animate a gauge needle -


i trying use d3.js animate gauge needle, end weird animation. have done search internet, couldn't figure out solution can use fix problem.

codepen

  function createneedle(sampleangle){     topx = centerx - math.cos(sampleangle) * trilength     topy = centery - math.sin(sampleangle) * trilength      leftx = centerx - 10 * math.cos(sampleangle - math.pi / 2)     lefty = centery - 10 * math.sin(sampleangle - math.pi / 2)      rightx = centerx - 10 * math.cos(sampleangle + math.pi / 2)     righty = centery - 10 * math.sin(sampleangle + math.pi / 2)       return " m " + leftx + " " + lefty + " l " + topx + " " + topy + " l " + rightx + " " + righty;    }    //animate needle   d3.select('.moveneedle')   .attr('d', createneedle(sampleangle1))   .transition()   .duration(2000)   .attr('d', createneedle(sampleangle2));

you can make life easier if apply transform="rotate()" instead of redrawing path.

nonetheless, need supply custom tween function, standard d3.interpolatetransformsvg acts in unexpected ways.

var topx = centerx - trilength,     topy = centery,      leftx = centerx,     lefty = centery + 10,      rightx = centerx,     righty = centery - 10;  function rotateneedle(sampleangle){     return "rotate(" + sampleangle + "," + centerx + "," + centery  + ")"; }  d3.select('.moveneedle')     // draw once     .attr('d', "m" + leftx + " " + lefty + " " + topx + " " + topy + " " + rightx + " " + righty)     // supply angles in degrees!     .attr('transform', rotateneedle(sampleangle1))     .transition()     .duration(2000)     .attrtween('transform', function ()  {         var = d3.interpolate(sampleangle1, sampleangle2)         return function (t) {              return rotateneedle(i(t));         };     });

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