Html canvas

ʕ What is HTML5 Canvas
ʕ Browser Support
ʕ To draw something
ʕ Canvas Examples
ʕ Events
ʕ Fillstyle
ʕ Gaming
Outlines

What is HTML5 Canvas
The HTML5 Canvas element is used to draw graphics via JavaScript.
The Canvas element is only a container for graphics. You must use JavaScript to
actually draw the graphics.
 Canvas used for drawing boxes, circles, text, and adding images etc.

Browser Support
The latest versions of Firefox, Safari, Chrome and Opera all support for HTML5
Canvas
but IE8 does not support canvas.

To draw something
you need 4 basic components
A Bitmap to hold the pixels.
 A Canvas to writing into the bitmap
A drawing like rectangle, arc, line etc
A paint to describe the colors and styles for the drawing

<!DOCTYPE html>
<html>
<head>
<title>A Simple Canvas
Example</title>
<style>
body {
background:#CCC;
}
#canvas {
margin: 10px;
padding: 10px;
background:#FFF;
</style>
</head>
<body>
<canvas id='canvas' width='900'
height='100'>
</canvas>
<script src="Untitled-1.js"></script>
</body>
</html>
A basic Example
var canvas = document.getElementById('canvas');
context = canvas.getContext('2d');
context.font = '38pt times of new roman';
context.fillStyle = 'cornflowerblue';
context.strokeStyle = 'blue';
context.fillText('Hey I am Javed Akhtar', canvas.width/4 -
150, canvas.height/2 + 14);
context.strokeText('Hey I am Javed Akhtar',
canvas.width/4 - 150, canvas.height/2 + 16 );
Java script code
HTML Code

Events
 Mouse
mousedown, mouseup, mousemove, mouseout and mouseover
 Keyboard
keydown
keypress
keyup

Canvas default setting
 By default, the browser creates canvas elements with a width of 300
pixels and a height of 150 pixels. You can change the size of a
canvas element by specifying the width and height attributes

Canvas Examples
 Canvas Animation
 Canvas Rotation
 drawImage(image, dx, dy)
 Text and Fonts
 Create Gradients

A fillStyle Example
<!DOCTYPE HTML><html> <head>
<style> #test { width: 100px; height:100px; margin: 0px auto; } </style>
<script type="text/javascript"> function drawShape(){ var canvas = document.getElementById('mycanvas');
if (canvas.getContext)
{var ctx = canvas.getContext('2d'); for (var i=0;i<7;i++){ for (var j=0;j<7;j++){ ctx.fillStyle='rgb(' + Math.floor(255-
20.5*i)+ ','+ Math.floor(255 - 42.5*j) + ',255)';
ctx.fillRect( j*25, i* 25, 55, 55 ); } } else { alert('You need Safari or Firefox 1.5+ to see this demo.');} } </script>
</head>
<body id="test" onload="drawShape();"> <canvas id="mycanvas"></canvas> </body></html>

Bounce ball game
 Create the Canvas and draw on it
 Move the ball
 Bounce off the walls
 Paddle and keyboard controls
 Game over
 Build the brick field
 Collision detection
 Track the score and win
 Mouse controls
 Finishing up

Create the Canvas and draw on it
<!DOCTYPE html>
<html>
<head><title>Gamedev Canvas Workshop</title> <style>* { padding: 0; margin: 0; }
canvas { background: #eee; display: block; margin: 0 auto; } </style></head>
<body>
<canvas id="myCanvas" width="480" height="320"></canvas>
<script> // JavaScript code goes here
</script>
</body>
</html>

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