A simple widget that turns a canvas into a Arc vizualizer.

• Arc.js is a "static" version without any dependencies

• ArcTween.js is the animated version, using TweenLite to handle animation stuff.

See the examples on this page

1. Include Arc.js in your HTML page.

    <script src="Arc.js"></script>
   

2. Add a canvas

    <canvas id="arc1" width="120" height="120"></canvas>
   

3. Create an Arc

    var canvas = document.getElementById("arc1");
    var startValue = 0.1;
    var arc1 = new Arc( canvas, startValue );
   

You can later change the arc value using the setValue method. The value should be normalized, so keep it between 0 and 1.

	arc1.setValue(.73);

1. Include TweenLite.js and ArcTween.js in your HTML page.

    <script src="TweenLite.min.js"></script>
    <script src="ArcTween.js"></script>
   

2. Create a canvas in your page. Try to make a square one, or the outcome might be erratic :)

    <canvas id="arc1" width="120" height="120"></canvas>
   

3. Now, you can create arcs. Feed them with the reference to your canvas, and a value to display. The value should be normalized, so keep it between 0 and 1.

    var canvas = document.getElementById("arc1");
    var startValue = 0.1;
    var arc1 = new Arc( canvas, startValue );
   

4. Animate the arc to suit your needs, using the tween method

    var newValue = 0.85; // normalized value, between 0 and 1
    var animationTime = 1; // in seconds
    var animationDelay = 0; // in seconds too
    arc1.tween( value, animationTime, animationDelay );
   

That's it.

• new Arc( canvas, value ) : constructor

• setValue( value ) : stores the value, and calls draw()
• draw() : redraws the arc
• tween( value, animationTime, animationDelay ) : animate the arc to a given value (Tween version only)

There are several properties that can allow a better control of your Arc, but you have to be aware that you can break things while having fun.

• strokeColor
• strokeBgColor
• value
• radius
• strokeWidth

It should run on every browser supporting the <canvas> element, so you're fine.

Created by @boblemarin in Namur (be).