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What is HTML5 Canvas, Key features of HTML5 Canvas

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Key features of HTML5 Canvas
Mar 27 2016

    HTML5 Canvas uses Canvas API calls from JavaScript to redraw and alter all the frames on a bitmapped screen. All frames can be manipulated before they are rendered. This immediate mode property of HTML5 Canvas distinguishes it from its counterparts such as Flash and Silverlight, which work in retained mode. HTML5 Canvas can be used to develop spectacular animations, applications and games by using advanced JavaScript functionalities which allow keyboard and mouse inputs, timer intervals, events, objects, classes, sound, math functions and other JS functionalities. Almost all modern browsers support HTML5 Canvas. To find out whether a browser supports specific Canvas features or not, you can also use a JavaScript library called modernizr.js.

     

    The Document Object Model (DOM) and Canvas

    The Document Object Model (DOM) is a cross-platform and language-independent convention that represents and interacts with objects in HTML, XHTML, and XML documents. It is accessible via JavaScript and allows the content and styles of page to change after being rendered on web browsers. Using Canvas 2D context through DOM, you can access the Canvas element. However graphical elements used on Canvas cannot be accessed through DOM. Before starting to use there are two DOM objects which should be understood:

    Object window is required to test and ensure that all assets and code are loaded before starting a Canvas application.

    Object document consists of all HTML tags available on the page including .

    Conflicting JavaScript code and functions: JavaScript runs on HTML pages. This means that there can be other application or code that is using JavaScript as well. This can pose a problem if both the codes have conflicting variables or functions. The solution is to encapsulate the conflicting code or function in another function. As JavaScript functions are objects, the conflicting codes or functions can be placed in other functions. This will end up making the second function a local in scope to the first function. 

     

    How to add Canvas in an HTML page 

    You can add tag directly inside the

    1. Attribute id is the reference name of canvas tag used in JavaScript code.
    2. Attribute width mentions the width of the canvas in pixels.
    3. Attribute height mentions the height of the canvas in pixels.

    Other attributes of tag are tabindex, title, class, accesskey, dir, draggable, hidden and many more.

     

    2D Context and the Current State

    All action happens in the object CanvasRenderingContext2D. It contains all the methods and properties used to draw on the canvas using a Cartesian coordinate system. The upper left corner of the canvas has coordinates 0,0 which increase moving right and down respectively. Once we start drawing on the canvas we need to manipulate stack of drawing states also call the current state. There are three current states which are Transformation matrix, Clipping region and Properties of the context.

     

    Drawing on the Canvas

    Drawing on the HTML5 Canvas requires a strong foundation of drawing, coloring and transforming basic 2D shapes. We can use paths to draw any shape on the canvas. Paths make use of a list of points and lines that are drawn between these points. beginPath()starts the path and closePath()ends the path. moveTo() and lineTo() commands control the most basic path. Path methods such as context.arc() are used to draw arcs and curves, which are further combined to create complex images.

     

    Text API in HTML5 Canvas

    Text API in HTML5 Canvas allows test rendering on HTML pages. This also allows the developer to interact with the canvas. The simplest way of displaying text on the canvas is using context.font style and CSS font style attributes such as font-style, font-weight, font-size, and font-face. Another useful method in HTML5 Canvas is measureText() which returns properties of the supplied text string.

     

    Images on the Canvas

    Canvas Image API is used to load images and apply to the Canvas. These images can be further cropped to show only a specific region on the Canvas. It also allows us to store arrays of pixels which can later be altered and drawn back on canvas. Use drawImage() method to directly display Image data on canvas. Three parameters used in drawImage() method are Image object, x and y values which represents  the start location or top left corner of the image.

     

    HTML5 Canvas Web Development Company

    HammockWeb is a Web Development Company having expertise in developing animations and applications using HTML5 Canvas. If you are looking for a reliable Web Development company to outsource any HTML5 Canvas projects then please do Contact Us.


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    Unless they’re coming in from one of your amazing blog posts (you do have a blog, right?), your home page will be the first impression your future client or customer gets of you. It may be the only time they ever look at your business. You don’t want them to run screaming off into the distance. You want them to, you know, stick around and eventually maybe even buy your stuff or hire you. Here are some tips from a leading web design agency in Los Angeles, for designing a home page that generates leads. 

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    The first step to designing a home page that generates leads is to make sure it looks professional. I’m sure you already know that you don’t want a website that looks like it’s designed by a kindergartener (although these days…)

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    Take some notes. Make some sketches. Yes, I know. It’s like school, but it’ll pay off in the end. You don’t want other people getting your business, just because your website looks sketchy.

    Now look at your notes. Can you make your website with a WordPress theme? Great! Go ahead!

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    This is called social proof. Dr. Robert Cialdini did a study (see a write-up of it) where he encouraged people to reuse towels in a hotel. Cialdini found that more people reused towels if told that other people also reused towels than reused towels if told that reusing towels would mean the hotel would donate money to help the environment. In other words, social proof was an even more powerful motivator than altruism.

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    Put Your Address and Telephone Number

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    You can use GT Metrix, Website Grader, and Google’s PageSpeed Insights to analyze your site’s speed and make fixes wherever required. Enabling browser caching and compression and optimizing images will minimize your page load time to a great extent.

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    Sharing is Caring

    Social sharing is the new boom. Integration of social media sharing buttons gives you the opportunity to make your visitors your advertisers. The more the people share your web pages on social networks, the more your exposure is increased. So embrace the practice of social media sharing and watch as the traffic on your website multiplies!

     

    Bottom line: Keep the user’s perspective in mind. If there is anything that annoys you while browsing sites, chances are that they will annoy other users, too, so it is best to employ those methods which help the user find exactly what they are looking for on your site without getting lost or overwhelmed by your website navigation. A user-friendly website will entice new visitors and turn them into regulars.