HTML5 is rich in functionality. Many of them involved with canvas element. KineticJS library makes it easy to work with HTML5 canvas element to create custom drawn widgets. Here I am presenting a simple example to draw a circle with animation.

Draw a circle with animation

  • Add a container 
    <div id="container"></div>
     
  • Initialize height and width of container while creating stage object. 
    
stage = new Kinetic.Stage({

container: 'container',

width: 578,

height: 200

});
  • Create Kinetic layer. 
    
layer = new Kinetic.Layer();
  • Specify interval to call circle draw method 
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interval = setInterval(drawCircle, 1000);
  • In drawCircle method, increase degree between 2 lines upto 360 in each call.
  • Create wedge object and initialize following parameters:
    • x and y coordinate: center of circle
    • angleDeg: degree between two radius
    • radius: length of radius
    • rotationDeg: starting point for circle 
    
wedge = new Kinetic.Wedge({

x: 100,

y: 100,

radius: 70,

angleDeg: degree,

fill: 'red',

rotationDeg: -90

});
  • Add created wedge to layer

    layer.add(wedge);
  • Add a layer to stage

    stage.add(layer);
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