HTML5 Tutorial: Creating Vector Masks using HTML5 Canvas

You will learn how to create a vector masks with HTML5 canvas. This is literally a very useful and worthy HTML5 tutorial that will make you educate about setting up the canvas and drawing an image in HTML5 as well as creating nice and pretty effects.

Perhaps you all be full acquainted with great advantages of HTML5 which offer to create many impressive things like graphics, games video effects and many more. Also, it enables you to create something less confounded effects such as image manipulation on the page. In my previous HTML5 tutorial posts, we have already discuss about creating various impressive things. However, through envisioned the great features and excellent advantages of HTML5 as well its flexibility, today I am going to deliver an amazing HTML5 tutorial that will make you learn to create vector masks with HTML5 Canvas.

As, we employ the word HTML5 Canvas, let me clarify this actually what about it is? The HTML5 canvas element is referred as a container for graphics which is used to draw graphics via scripting on the fly. Moreover, a canvas is also considered as a graphic region defined in HTML code assigned with width and height attributes. It comprises various way for drawing boxes, characters, paths, circles and including images.

However, by keeping these features and achievements today in this post we will employ canvas tag and clipping in order to create pictures which are no regular. So, lets go ahead and take a look over this tutorial:

Setting up the Canvas

In this illustration, we will consider an image and attempt to transform its shape through this canvas. However, towards this endeavor first of all you will required a canvas tag in your page.

Simply, it will define a canvas for our image stating height and width. I have assigned these dimension to check it acquiring additional space than it required.

Later, we will attempt to get the canvas and its drawing context in JavaScript.

Now, by employing canvas we can move ahead to start drawing our image.

Drawing the Image into the Canvas

As, we have already set-up our canvas, now we should proceed to draw the image into the canvas. It is very simple and easy to perform, though in order to draw it we would require a HTML img element for our image. However, by employing JavaScript we can grab an <img> tag from our page.

 

 

Run this Code

Now, we are supposed to build a new element regarding our image. Though, it seems to be very confounded to draw the image until you will download it. Therefore, we will have to wait for onload in context of drawing the image. Inside onload listener, we are required to call ctx.drawImage(), and pass to the <img> element. Also, we define 0, 0 which says that we will draw it 0 pixels from left and top.

Finally we would attempt to set the src for our image, which tends browser to retrieve the image data.

Clip that Image

Now, we can employ a technique of clipping in the canvas. Here, we would employ a path towards defining the future operation that should influence the area only within the path. As, the canvas is available as transparent, while we attempt to generate a clipping path, and then after draw the image. As a result, the image will appear inside the shape of concerned path.

However, now let’s proceed to draw a circle through clipping to concerned path.

Run this code

Here, you may notice the call of ctx.save() and ctx.restore(). It is because whatever we attempt to accomplish in the canvas we will clip it in the clipping region then only it will work. Prior to clip we will call save() function and then call restore(). However, prior to implementation of clipping the state of canvas will be restored. Whatever, you drawn in the canvas will remain as it was, but the definition of clipping will be gone.

Go Crazy

Moreover, you can also clip more than circles. It provide freedom to any kind of shape as you wish. Only you are required to define your path.

Run this Code

However, you can also employ clipping with combination of other techniques in context of creating beautiful and immersing effects.

Hopefully, this post HTML5 Tutorial: Creating Vector Masks using HTML5 Canvas will proved to be very worthy for professionals as well as especially for those who are attempting to earn sound experience in HTML5. This is very simple and easy HTML5 tutorial to comprehend as well as employ accordingly. Therefore, just go ahead to employ these HTML5 technique to your upcoming HTML5 web development project.

Webgranth

Admin from India is a founder of WebGranth, an entity of Sparx IT Solutions with over 8 years of experience on different verticals of web design & development. In his quest to spread the knowledge regarding web development, he has been contributing in WebGranth by submitting his valuable blogs.