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PODraggable and Rotatable Object in Javascript (Mootools)
 

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    <p>Ok, I feel like a big dummy for not remembering remedial math(s), but for the life of me I can't recall how to do basic trigonometry (I'm a backend developer so I've literally never used this in my life).</p> <p>I'm working on a draggable / rotatable object in MooTools that somewhat resembles the process of scaling and rotating images in Photoshop. Basically 5 control elements. The center drags the object, and the corner controls rotate the object. Best way to show it:</p> <pre><code>var Box = new Class({ element: null, boxes: {}, rotators: {}, draggers: {}, size: 10, controls: { 'center': { x: [45, 45], y: [45, 45] }, 'topleft': { x: [0, 0], y: [0, 0] }, 'topright': { x: [90, 90], y: [0, 0] }, 'bottomleft': { x: [0, 0], y: [90, 90] }, 'bottomright': { x: [90, 90], y: [90, 90] } }, initialize: function (el) { // the element to use this.element = el; // Create dragger boxes Object.each(this.controls, function (value, key, i) { // Boxes this.boxes[key] = new Element('div', { 'id': key, 'class': 'box', }).setStyles({ 'left': value.x[0] + 'px', 'top': value.y[0] + 'px', 'height': this.size + 'px', 'width': this.size + 'px' }).inject(this.element); // Draggers this.draggers[key] = new Drag(key, { limit: { x: value.x, y: value.y }, onDrag: function (el, e) { // Get this el.addClass('dragging'); // The center moves it if (el.id == 'center') { // Move it around el.getParent().setStyles({ left: (e.client.x - 45), top: (e.client.y - 45) }); // Else, rotating } else { // Get the current rotation of the object var rotation = el.getParent().getStyle('transform'); // If it hasn't been set ( for whatever reason ) if (rotation == null) rotation = "0"; // The coordinates of the box clicked var center = $('center').getCoordinates(); var coords = el.getCoordinates(); // Rotate var rotate = (rotation.replace(/[A-Za-z\(\)$-]/g, "")).toInt() + 2; // Log the rotation console.log(rotate); // Set the styling for the parent el.getParent().setStyles({ 'transform': 'rotate(' + rotate + 'deg)', '-o-transform': 'rotate(' + rotate + 'deg)', '-ms-transform': 'rotate(' + rotate + 'deg)', '-webkit-transform': 'rotate(' + rotate + 'deg)' }); // if } }, onComplete: function (el) { el.removeClass('dragging'); } // draggers }); // bind it all together }.bind(this)); // initialize } // box }); new Box($('box')); </code></pre> <p>I've got the draggable part and the rotation piece in there, but I can't figure out how to calculate the angle of rotation. Can anyone help a big dummy with this problem?</p> <p>Here's the playground: <a href="http://jsfiddle.net/jessejamesrichard/j4uV2/3/" rel="nofollow">http://jsfiddle.net/jessejamesrichard/j4uV2/3/</a></p> <p>A million thanks in advance.</p>
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