Question

Can I implement snap to grid operation with images in KineticJS
using jquery? (http://jqueryui.com/demos/draggable/snap-to.html)
Like I have few draggable images inside a canvas and I want them to restrict the movement inside a canvas…

Is it even possible that 2 images can snap together when one comes near the other in the canvas??
And can it be achieved using kinetic.js or javascript…

Thanks
Ashish

Here is the code..
it’s a little complicated. I mean I’m loading images from outside the canvas..and there are two sets..now I want one set to be able to snap to other..

  <script src="kinetic-v3.8.0.min.js">
  </script>
  <link rel="stylesheet" href="../../themes/base/jquery.ui.all.css">
<script src="jquery-1.7.1.js"></script>
<script src="jquery.ui.core.js"></script>
<script src="jquery.ui.widget.js"></script>
<script src="jquery.ui.mouse.js"></script>
<script src="jquery.ui.draggable.js"></script>



    <script>
        function drawImage(imageObj){

            var stage = new Kinetic.Stage("container", 578, 500);
            var layer = new Kinetic.Layer();
            var x = stage.width / 2 - 200 / 2;
            var y = stage.height / 2 - 137 / 2;
            var width = 200;
            var height = 137;

            // darth vader
            var darthVaderImg = new Kinetic.Shape(function(){
                var context = this.getContext();

                context.clearRect(x,y,width,height);
                context.drawImage(imageObj, x, y, width, height);
                // draw invisible detectable path for image
                context.beginPath();
                context.rect(x, y, width, height);
                context.closePath(); 


          });

            // enable drag and drop
            darthVaderImg.draggable(true);

            // add cursor styling
            darthVaderImg.on("mouseover", function(){
                document.body.style.cursor = "pointer";
            });
            darthVaderImg.on("mouseout", function(){
                document.body.style.cursor = "default";
            });
            //remove image on double click
            darthVaderImg.on("dblclick dbltap", function(){
            layer.remove(darthVaderImg);


            layer.draw();
                });
            layer.add(darthVaderImg);
            stage.add(layer);

            //events

        }


         function drawImage2(imageObj){

            var stage = new Kinetic.Stage("container", 578, 500);
            var layer = new Kinetic.Layer();

            var x = stage.width / 2 - 300 ;
            var y = stage.height / 2 - 137 ;
            var width = 200;
            var height = 137;

            // darth vader

            var darthVaderImg2 = new Kinetic.Shape(function(){
                var context = this.getContext();

                context.drawImage(imageObj, x, y, width, height);

                // draw invisible detectable path for image
                context.beginPath();
                context.rect(x, y, width, height);
                context.closePath();

            });

            // enable drag and drop
            darthVaderImg2.draggable(true);

            // add cursor styling
            darthVaderImg2.on("mouseover", function(){
                document.body.style.cursor = "pointer";
            });
            darthVaderImg2.on("mouseout", function(){
                document.body.style.cursor = "default";
            });
            //remove image on double click
            darthVaderImg2.on("dblclick dbltap", function(){
            layer.remove(darthVaderImg2);


            layer.draw();



                   });
                layer.add(darthVaderImg2);

             stage.add(layer);



          $( ".darthVaderImg2" ).draggable({ grid: [ 20,20 ] });

             }



               function load(img){
                 // load image

                 var imageObj = new Image();
                 imageObj.onload = function(){

                drawImage(this);

                  };
                   imageObj.src = img.src;
                    };
                 function load2(img){
             // load image
                 var imageObj = new Image();
                imageObj.onload = function(){
                drawImage2(this);
               };
               imageObj.src = img.src;
                 };
             </script>
            <title>HTMl5 drag drop multiple elements</title></head>
             <body onmousedown="return false;">
              <div id="container">
              </div>
             <div id="check1">
            <ul id="img"> <li><a href="#"onclick="load(document.getElementById('i1'))">
            <img class="ui-widget-header" src="dog.png" id="i1" alt="doggie"     width="60"height="55"/>
      </a></li>
      <li>
        <a href="#" onclick="load(document.getElementById('i2'))">
        <img src="dog2.png" id="i2" alt="Pulpit rock" width="60" height="55"        /></a>
    </li>
    </ul>
    </div>
    <ul id="img1">
        <li><a href="#" onclick="load2(document.getElementById('i4'))">
            <img alt="doggie" src="beach.png" id="i4" width="60" height="55" />
             </a></li>
             <li><a href="#" onclick="load2(document.getElementById('i5'))">
        <img alt="doggie" src="cat3.png" id="i5" width="60" height="55" /></a></li>
       </ul>
       </body>
        </html>

Answer 1

I submitted an answer to this question that doesn’t use jQuery. Instead, there is a patch you can apply which gives you drag and drop with snap to grid in KineticJS on the HTML5 canvas.

Using jquery draggable UI with kineticJs to make elements snap to grid?