Creating 2-D Animations on Canvas

In this animation, you will:

  • Move a balloon and its reflection across a background of floating hot air balloons.
  • Make the movement smooth by using the timer functions.
  • Make them move forward and backward seamlessly.
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The flight of hot air balloon

In this example, the background is an image made by using CSS in canvas element.

The balloon and its reflection are produced by two images.

The images are moved across the background by using JavaScript.




The Code for the Flight of Hot Air Balloon is as follows:

<script type="text/javascript">
var canvas = document.getElementById('Canvas_T');
var context = canvas.getContext('2d');
// image of the top balloon
var imgObj1 = new Image();
// image of the second balloon
var imgObj2 = new Image();
var i = 0; var j = 1; var x; var y;
// function for the movement
function circ() {
i = i + j;
if (i == 400) { j = -1; }
if (i == 0) { j = 1; }
context.clearRect(0, 0, 500, 400);
x = i;
y = Math.round(100 + 15 * Math.sin(i * Math.PI / 180));
context.drawImage(imgObj1, x, y);
imgObj1.src = '../images/hot.png';
context.drawImage(imgObj2, x, y + 180);
imgObj2.src = '../images/hot1.png';
}
</script>

 

 

Resources at Fingertips

There is a significant selection of tutorials here, covering ASP.Net, HTML5, CSS3 and JavaScript. They are categorized clearly for you to access them easily on any device - desktops/laptops, smartphones and laptops.
There are quite a few of them on HTML5 Canvas and CSS3. In addition, there are tutorials on JavaScript and ASP.Net too.

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Recommended Reading

 

The best book to master HTML5 canvas animations. The author tells you how to manipulate the canvas element with JavaScript in a progressive way - starting from the easier to harder worked examples. It is ideal for anyone who wants to be a game developer in HTML5.

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