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    <p>I've gotten it working pretty roughly: <a href="http://jsfiddle.net/UT69H/18/" rel="nofollow">http://jsfiddle.net/UT69H/18/</a></p> <p>It's really jittery, but it rotates with the path. Note that I moved the mousemove handler to the body element so that it doesn't abruptly stop if your mouse moves outside of the box itself.</p> <pre><code>bod.on "mousemove", () -&gt; if mousedown pos = getPosHandle { x: d3.mouse(h[0][0])[0], y: d3.mouse(h[0][0])[1] } pos1 = getPosHandle { x: d3.mouse(h[0][0])[0], y: d3.mouse(h[0][0])[1] - 1 } pos2 = getPosHandle { x: d3.mouse(h[0][0])[0], y: d3.mouse(h[0][0])[1] + 1 } ang = Math.round(Math.atan2(pos2.y - pos1.y, pos2.x - pos1.x) * 180 / Math.PI) - 90 h.attr "transform", "rotate(#{ang} #{pos.x} #{pos.y})" h.attr "x", (pos.x - h.attr("width") / 2) h.attr "y", (pos.y - h.attr("height") / 2) </code></pre> <p>This is a bit better: <a href="http://jsfiddle.net/UT69H/19/" rel="nofollow">http://jsfiddle.net/UT69H/19/</a></p> <pre><code>bod.on "mousemove", () -&gt; if mousedown pos = getPosHandle { x: d3.mouse(bod[0][0])[0], y: d3.mouse(bod[0][0])[1] } pos1 = getPosHandle { x: d3.mouse(bod[0][0])[0], y: d3.mouse(bod[0][0])[1] - 1 } pos2 = getPosHandle { x: d3.mouse(bod[0][0])[0], y: d3.mouse(bod[0][0])[1] + 1 } ang = Math.round(Math.atan2(pos2.y - pos1.y, pos2.x - pos1.x) * 180 / Math.PI) - 90 h.attr "transform", "rotate(#{ang} #{pos.x} #{pos.y})" h.attr "x", (pos.x - h.attr("width") / 2) h.attr "y", (pos.y - h.attr("height") / 2) </code></pre> <p>You can reduce the jitter by spacing the test points further out: <a href="http://jsfiddle.net/UT69H/21/" rel="nofollow">http://jsfiddle.net/UT69H/21/</a></p> <pre><code>bod.on "mousemove", () -&gt; if mousedown pos = getPosHandle { x: d3.mouse(bod[0][0])[0], y: d3.mouse(bod[0][0])[1] } pos1 = getPosHandle { x: d3.mouse(bod[0][0])[0], y: d3.mouse(bod[0][0])[1] - 4 } pos2 = getPosHandle { x: d3.mouse(bod[0][0])[0], y: d3.mouse(bod[0][0])[1] + 4 } ang = Math.round(Math.atan2(pos2.y - pos1.y, pos2.x - pos1.x) * 180 / Math.PI) - 90 h.attr "transform", "rotate(#{ang} #{pos.x} #{pos.y})" h.attr "x", (pos.x - h.attr("width") / 2) h.attr "y", (pos.y - h.attr("height") / 2) </code></pre>
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    1. POis there a way to *getRotationAngleAtLength(in float distance)* similar to getPointAtLength(in float distance)
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    1. POis there a way to *getRotationAngleAtLength(in float distance)* similar to getPointAtLength(in float distance)
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    1. COhttp://jsfiddle.net/UT69H/20/ This will work for almost any path, though perhaps a bit quirkily.
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    2. COhey, that's pretty cool. I like the way you interpolate the euclidian distance when it comes to a path that's not only following one axis, but two dimensions :) I just wondered how you could get rid of the quirkyness ... you'd have to calculate the angle and see if it's above or below 45°, get rid of the euclidian formula and just do a switch of if so, use this axis as formula-base, if different the other ... possible I guess, cool man, keep it up
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    3. CO@Joehannes Pretty good idea. The syntax of coffeescript throws me a bit, so I didn't play around too much, but I'm sure you can take it from here. :)
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