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Chart.js, Canvas

Chart.js

Charts.js is a library for JavaScript which uses HTMLs canvas to render various different beautiful charts for the web.

  • The first thing we need to do is download Chart.js. Copy the Chart.min.js out of the unzipped folder and into the directory you’ll be working in. Then create a new html page and import the script:
<head>
        <meta charset="utf-8" />
        <title>Chart.js demo</title>
        <script src='Chart.min.js'></script>
    </head>
  • To draw a line chart add this to the body of our HTML page:
<script>
    var buyers = document.getElementById('buyers').getContext('2d');
    new Chart(buyers).Line(buyerData);
</script>
  • Inside the same script tags we need to create our data , Add this immediately above the line that begins ‘var buyers=’:
var buyerData = {
	labels : ["January","February","March","April","May","June"],
	datasets : [
		{
			fillColor : "rgba(172,194,132,0.4)",
			strokeColor : "#ACC26D",
			pointColor : "#fff",
			pointStrokeColor : "#9DB86D",
			data : [203,156,99,251,305,247]
		}
	]
}

and you can drow bar,pie or whatever you want folowing this link chartjs.org

canvas

The HTML < canvas> element is used to draw graphics, on the fly, via scripting (usually JavaScript).

The < canvas> element is only a container for graphics. You must use a script to actually draw the graphics.

Canvas has several methods for drawing paths, boxes, circles, text, and adding images.

HTML Canvas Can be Animated

Canvas objects can move. Everything is possible: from simple bouncing balls to complex animations.```

HTML Canvas Can be Interactive

Canvas can respond to JavaScript events.
Canvas can respond to any user action (key clicks, mouse clicks, button clicks, finger movement).

HTML Canvas Can Draw Text

Canvas can draw colorful text, with or without animation.

HTML Canvas Can Draw Graphics

Canvas has great features for graphical data presentation with an imagery of graphs and charts.

HTML Canvas Can be Used in Games

Canvas' methods for animations, offer a lot of possibilities for HTML gaming applications.