Rotating an SVG shape a full 360 degrees results in no visible change

Currently, I am utilizing d3.js for a project and encountering an issue with rotating an SVG element 360 degrees to achieve a full spin back to its original position.

If I rotate the element 3/4 of the way using the following code snippet, it works effectively:

    thing
        .transition()
        .attr('transform', 'rotate(270,640,426)')
        .duration(6000);

However, when attempting to animate the complete rotation by specifying 360 degrees like this, nothing happens:

    thing
        .transition()
        .attr('transform', 'rotate(360,640,426)')
        .duration(6000);

I suspect that d3 (or possibly a general characteristic of the SVG transform attribute) recognizes the end position as identical to the beginning and therefore takes a shortcut by not executing any rotation. Likewise, if I try a 365-degree rotation, it only shifts by +5 degrees.

A. Why does this occur? B. What is the correct approach to accomplish a full 360-degree rotation?

javascriptsvgd3.jstransformcss-transforms

Answer №1

The transformation of SVG elements in D3 is normalized, which explains the effect you are witnessing. However, you can achieve a similar result using a custom tween function as follows:

function rotateTween() {
  var interpolation = d3.interpolate(0, 360);
  return function(time) {
    return "rotate(" + interpolation(time) + ")";
  };
}

For a complete example, see it in action here.

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