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POJavascript point to point angle calculation
 

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  1. POJavascript point to point angle calculation
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    <p>We got 3 points: <strong>start</strong>, <strong>end</strong> and <strong>mail</strong>.</p> <p><img src="https://i.stack.imgur.com/t2Fgu.png" alt="description"></p> <p>The mail image, moves in a curved line from the start and end point, this is done by jQuery animate.</p> <p>Now the next step is to make the mail image rotate while the animation is running. So at the start point and end point it would be rotated 0 degrees, but while animating, it should rotate facing the path of the animation. (see the image)</p> <p>What I have tried:</p> <p><a href="http://jsfiddle.net/R5dRd/6/" rel="nofollow noreferrer">JSFiddle</a></p> <pre><code>// Init dom elements var $start = $('#start'); var $end = $('#end'); var $mail = $('#mail'); // Get position coordinates var startPos = $start.position(); var endPos = $end.Position(); // Angle calculation var getAngle = function(currX, currY, endX, endY) { var angle = Math.atan2(currX - endX, currY - endY) * (180 / Math.PI); if (angle &lt; 0) { angle = Math.abs(angle); } else { angle = 360 - angle; } return angle; }; // Mail angle var getMailAngle = function() { var currPos = $mail.position(); var endPos = $end.position(); return getAngle(currPos.left, currPos.top, endPos.left, endPos.top); }; // Animate $mail.animate({top: endPos.top, left: endPos.left}, { specialEasing: {left: "easeInSine", top: "linear"}, // Executed each "animation" frame, so we rotate here. step: function() { var angle = getMailAngle(); $(this).css('transform', 'rotate(' + angle + 'deg')); } }); </code></pre> <p>But the code above is not correct, the angle doesn't face up when started / ended, I have very little experience with geometry math, so I really appreciate help for the rotating calculations.</p>
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    1. COI don't see why it should face up when started/ended given that the path pictured does not exit the start and enter the end at a 90° angle.
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    2. CO@MattBall the true animation does actually start and end with 90° angle, the image was quickly in photoshop and has an offset sadly
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    3. COIs this what you see? http://jsfiddle.net/R5dRd/
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