JavaScript Canvas

Jun 11, 2020Download as pptx, pdf0 likes144 views

The document discusses the JavaScript Canvas API which allows drawing 2D and 3D graphics on HTML pages. It provides steps to get started with Canvas including creating a <canvas> element, getting the drawing context, and using methods like beginPath(), moveTo(), lineTo(), strokeWidth, and stroke() to draw lines on the canvas.

Intro..
Used to draw images
Came with HTML5 to draw 2d and 3d graphics
Used for games and visualization

How to start
Must have concept of HTML and basic Javascript
Steps to get started :
 1. Create canvas element with attributes – ID,
 HEIGHT and WIDTH
 2. Add Styles(*Optional)
 3.Get canvas element using ID
4. Get Canvas Context (2D or 3D)
 5. Draw using Context

Steps
1. Create Canvas
// index.html
<canvas id="myCanvas" width="800"
height="1200"></canvas>

Step 2 and 3
Add Styles
// styles.css
body {
background: #111;
color: #f8f8f8;
}
#myCanvas {
background: #f8f8f8;
padding: 0;
margin: 0 auto;
margin-bottom: 1rem;
display: block;
}

Step 3 and 4
Get canvas using Id and canvas context
var canvas =
document.getElementById("myCanvas");
var ctext = canvas.getContext("2d");

Step 5
**Draw using context **
ctext.beginPath();
ctext.moveTo(150,10);//moveTo(x,y) - defines the
starting point of the line
ctext.lineTo(20, 100);//lineTo(x,y) - defines the
ending point of the line
ctext.lineWidth = 5;
ctext.strokeStyle = "blue"; //color of the line
ctext.stroke(); // to provide ink to the line

<!DOCTYPE HTML>
<html>
<head>
<title> Canvas </title>
<style>
body { margin: 0px; padding: 0px; }
#myCanvas { border: 1px solid red; }
</style>
<script>
window.onload = function()
{
var canvas = document.getElementById("mCanvas");
var ctext = canvas.getContext("2d");
ctext.beginPath();
ctext.moveTo(150,10);//moveTo(x,y)
ctext.lineTo(20, 100);//lineTo(x,y)
ctext.lineWidth = 5;
ctext.strokeStyle = "blue"; //color of the line
ctext.stroke(); // to provide ink to the line
};
</script>
</head>
<body>
<canvas id="mCanvas" width="360" height="200"></canvas>
</body>
</html>

How to draw
Set the style -
1)Begin Path
2)Use functions and Coordinates
3)Draw the path to screen

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JavaScript Canvas

1. JavaScript Canvas Jagriti Srivastava

2. Intro.. Used to draw images Came with HTML5 to draw 2d and 3d graphics Used for games and visualization

3. How to start Must have concept of HTML and basic Javascript Steps to get started :  1. Create canvas element with attributes – ID,  HEIGHT and WIDTH  2. Add Styles(*Optional)  3.Get canvas element using ID 4. Get Canvas Context (2D or 3D)  5. Draw using Context

4. Steps 1. Create Canvas // index.html <canvas id="myCanvas" width="800" height="1200"></canvas>

5. Step 2 and 3 Add Styles // styles.css body { background: #111; color: #f8f8f8; } #myCanvas { background: #f8f8f8; padding: 0; margin: 0 auto; margin-bottom: 1rem; display: block; }

6. Step 3 and 4 Get canvas using Id and canvas context var canvas = document.getElementById("myCanvas"); var ctext = canvas.getContext("2d");

7. Step 5 **Draw using context ** ctext.beginPath(); ctext.moveTo(150,10);//moveTo(x,y) - defines the starting point of the line ctext.lineTo(20, 100);//lineTo(x,y) - defines the ending point of the line ctext.lineWidth = 5; ctext.strokeStyle = "blue"; //color of the line ctext.stroke(); // to provide ink to the line

8. <!DOCTYPE HTML> <html> <head> <title> Canvas </title> <style> body { margin: 0px; padding: 0px; } #myCanvas { border: 1px solid red; } </style> <script> window.onload = function() { var canvas = document.getElementById("mCanvas"); var ctext = canvas.getContext("2d"); ctext.beginPath(); ctext.moveTo(150,10);//moveTo(x,y) ctext.lineTo(20, 100);//lineTo(x,y) ctext.lineWidth = 5; ctext.strokeStyle = "blue"; //color of the line ctext.stroke(); // to provide ink to the line }; </script> </head> <body> <canvas id="mCanvas" width="360" height="200"></canvas> </body> </html>

9. How to draw Set the style - 1)Begin Path 2)Use functions and Coordinates 3)Draw the path to screen

JavaScript Canvas

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