HTML5 Canvas Shape Layering with KineticJS

To layer shapes with KineticJS, we can use one of the following layering methods: moveToTop(), moveToBottom(), moveUp(), moveDown(), or setZIndex(). You can also layer groups and layers.

Instructions: Drag and drop the boxes to move them around, and then use the buttons on the left to reorder the yellow box.

Open in new window

Code Editor

<!DOCTYPE HTML>
<html>
  <head>
    <style>
      body {
        margin: 0px;
        padding: 0px;
      }
      #buttons {
        position: absolute;
        left: 10px;
        top: 0px;
      }
      button {
        margin-top: 10px;
        display: block;
      }
    </style>
  </head>
  <body>
    <div id="container"></div>
    <div id="buttons">
      <button id="toTop">
        Move yellow box to top
      </button>
      <button id="toBottom">
        Move yellow box to bottom
      </button>
      <button id="up">
        Move yellow box up
      </button>
      <button id="down">
        Move yellow box down
      </button>
      <button id="zIndex">
        Set yellow box zIndex to 3
      </button>
    </div>
    <script src="http://d3lp1msu2r81bx.cloudfront.net/kjs/js/lib/kinetic-v4.5.1.min.js"></script>
    <script defer="defer">
      var stage = new Kinetic.Stage({
        container: 'container',
        width: 578,
        height: 200
      });
      var layer = new Kinetic.Layer();
      var offsetX = 0;
      var offsetY = 0;
      var colors = ['red', 'orange', 'yellow', 'green', 'blue', 'purple'];
      var yellowBox = null;

for(var n = 0; n < 6; n++) {
        // anonymous function to induce scope
        (function() {
          var i = n;
          var box = new Kinetic.Rect({
            x: i * 30 + 210,
            y: i * 18 + 40,
            width: 100,
            height: 50,
            fill: colors[i],
            stroke: 'black',
            strokeWidth: 4,
            draggable: true,
            name: colors[i]
          });

box.on('mouseover', function() {
            document.body.style.cursor = 'pointer';
          });
          box.on('mouseout', function() {
            document.body.style.cursor = 'default';
          });
          if(colors[i] === 'yellow') {
            yellowBox = box;
          }

layer.add(box);
        })();
      }

stage.add(layer);

// add button event bindings
      document.getElementById('toTop').addEventListener('click', function() {
        yellowBox.moveToTop();
        layer.draw();
      }, false);

document.getElementById('toBottom').addEventListener('click', function() {
        yellowBox.moveToBottom();
        layer.draw();
      }, false);

document.getElementById('up').addEventListener('click', function() {
        yellowBox.moveUp();
        layer.draw();
      }, false);

document.getElementById('down').addEventListener('click', function() {
        yellowBox.moveDown();
        layer.draw();
      }, false);

document.getElementById('zIndex').addEventListener('click', function() {
        yellowBox.setZIndex(3);
        layer.draw();
      }, false);
    </script>
  </body>
</html>

< Groups Change Containers >

More Examples

Modified on April 9th, 2013 by Eric Rowell