SnapTut/snaptut-dragplugin.html at master · ibrierley/SnapTut · GitHub

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<!DOCTYPE html>
<html>
    	<head>
<title>Snap.svg Tutorial</title>
<script src="analytics.js" async></script>
	</head>
<body>


<link href="/snapstyle.css" rel="stylesheet">
<div id="container"></div>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js"></script>
<script src="snap.svg.js"></script>
<a href="http://snapsvg.io/docs/">Snap Docs</a>&nbsp;&nbsp;<a href="/">More SVG Dabbles</a>&nbsp;&nbsp;<a href="/">Contact Me</a>
<article>
  <h1 class="heading">Snap Dragging with a plugin, taking into account currentmatrix</h1>
  <div class="intro">Not sure if this is a good way, but works for a lot of bits I play with</div>
  <pre class="codestuff"><code contenteditable="true">

var s = Snap("#svgout");

Snap.plugin( function( Snap, Element, Paper, global ) {

    Element.prototype.altDrag = function() {
        this.drag( dragMove, dragStart, dragEnd );
        return this;
    }

    var dragStart = function ( x,y,ev ) {
	    this.data('ot', this.transform().local );
    }

    var dragMove = function(dx, dy, ev, x, y) {
	    var tdx, tdy;
	    var snapInvMatrix = this.transform().diffMatrix.invert();
	    snapInvMatrix.e = snapInvMatrix.f = 0;
	    tdx = snapInvMatrix.x( dx,dy ); tdy = snapInvMatrix.y( dx,dy );
	    this.transform( this.data('ot') + "t" + [ tdx, tdy ]  );

    }

    var dragEnd = function() {
    }


});

s.attr({ viewBox: "0 0 100 100" });

var t1 = s.text( 0, 20, "red = altDrag" );
var t2 = s.text( 0, 35, "blue = normal drag" );
var r1 = s.rect(0,0,20,20).transform('t50,50').attr({ fill: "red" }).altDrag();
var g1 = s.g( r1 ).transform('r45');

var r2 = s.rect(20,20,20,20).transform('t50,50').attr({ fill: " blue" }).drag();
var g2 = s.g( r2 ).transform('r45');


   </code>
	<button class="run">Edit/Run</button>
</pre>
</article>

<div class="intro">SVGout area...</div>
<div class="output">
	<svg id="svgout" width="400" height="400"></svg>
</div>

<div class="intro">The actual svg markup looks like this (when you've clicked on run)....</div>
<div id="htmlraw"></div>

<script src="snaptut.js"></script></script>
<script src="hijs.js"></script>

</body>