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Posted By Antony Rajiv On March 5, 2012 @ 12:49 pm In Featured | No Comments

HTML5 Glucophage For Sale,  

HTML5 is the latest iteration of the HTML specification. Even as I'm writing this article, Discount Glucophage, it is still under active development. In addition to specifying new markup tags, HTML5 also contains new application programming interfaces (APIs), about Glucophage, which enables us to provide rich multimedia and interactive capabilities to web pages, Herbal Glucophage, without using proprietary plug-ins.

 

Besides HTML5, the World Wide Web consortium has also published specifications for other related technologies, Glucophage overnight, such as geo-location, Buy Glucophage without prescription, offline storage, file management etc.

 

Browsers are more like operating systems now; in fact Google's Chrome OS is an attempt to use the Chrome browser as an OS for running various web apps, Glucophage pharmacy. Using HTML5 and related technologies, we can build applications that blur the lines between traditional desktop and web, Glucophage For Sale.

 

HTML5 - Graphics with the Canvas Element

 

In this post I will provide a short introduction to the new "<canvas>" element of HTML5 which allows us to draw graphics in browser using scripting. Glucophage trusted pharmacy reviews, We will look at a very simple "Hello Triangle" example code to render a triangle on the browser window.

 

Before we begin, you need to be aware that HTML5 and the related technologies are only partially supported in the latest version of web browsers, buy Glucophage from mexico. To use the canvas element, Comprar en línea Glucophage, comprar Glucophage baratos, you would need the latest version of Firefox, Chrome, Safari (including IOS), Glucophage interactions, or IE 9.0.

 

What is Canvas? Glucophage For Sale,  

In HTML5, <canvas> is a new tag element. Glucophage australia, uk, us, usa, Like the physical world, it is a container where you can draw. Here is a complete HTML5 page with the canvas element, australia, uk, us, usa.

 

 

 







    <!DOCTYPE HTML>     <html>

         <head>

             <title>HTML5 - Hello Triangle</title>

         </head>

          <body>

             <canvas id="canvas" width="800" height="600">

             </canvas>

         </body>

    </html>


 

 

This short HTML5 code does not do anything yet. Buy generic Glucophage, For drawing and manipulating elements within the canvas, we will code using JavaScript.

 

The Canvas Layout and Geometry:

 

The canvas drawing region will be a rectangle with pixel dimensions for width and height that we specify within the <canvas> tag, Glucophage For Sale. In our example, cheap Glucophage, width is 800px and height is 600px. Glucophage class, Canvas uses a coordinate system for drawing. The top left hand corner of the canvas is coordinate (0, 0), Glucophage alternatives. As we go towards the right, Glucophage online cod, the "x" axis values increase until the value is the width of canvas and as we go down, the “y” axis values increase, until its value is the height of canvas, Glucophage coupon. Glucophage For Sale, Based on our example the x-axis will be a line from point (0, 0) to (800, 0) and y-axis will be from (0, 0) to point (0, 600).

 

 








[1]



 

 

In order to access the canvas for drawing we need to acquire its "context". Buy no prescription Glucophage online, In JavaScript we can do it like this:

 

 







var myCanvas = document.getElementById("canvas"); //canvas element from page

var ctx = myCanvas.getContext("2d"); //get the 2-Dimensional context 


 

 

Now, "ctx" holds the 2D context for the canvas element, for drawing in a two dimensional space, Glucophage recreational. We will use it to draw our triangle. Glucophage samples, You might wonder if there is a "3D" context. Currently there is no 3D context as part of the standard, Glucophage For Sale. There exists other evolving APIs like WebGL, which can be used for 3D graphics using JavaScript, doses Glucophage work, however this is not part of the standard and has very limited browser support. Glucophage dangers,  

 Let’s Draw a Line!

 

What do we need to know to draw a line. We need two points, start coordinate (x1, Glucophage natural,y1) and end coordinate (x2, Rx free Glucophage, y2). For line drawing we use the following method:

 

 







function drawLine(ctx, color, order Glucophage from mexican pharmacy, x1, Glucophage over the counter, y1, x2, y2){

      ctx.beginPath();

      ctx.strokeStyle=color;

      ctx.moveTo(x1, Glucophage description, y1);

      ctx.lineTo(x2, Glucophage price, y2);

      ctx.stroke();

      ctx.closePath();

  }


 

This method uses the 2D context ("ctx") and draws lines using it, with the specified color. Glucophage For Sale, "moveTo()" method moves to a particular point on the canvas without drawing anything, and “lineTo()” method draws a line to a new point from the current point (specified by previous “moveTo() “). We will use this method to draw the edges of our triangle, japan, craiglist, ebay, overseas, paypal.

 

Drawing the Triangle:

 

Since we have the code to draw the line, Glucophage wiki, it is easy to draw the triangle using that, here is the method to draw the three lines of the triangle.

 

 







function drawTriangle(ctx, kjøpe Glucophage på nett, köpa Glucophage online, color, Glucophage from canadian pharmacy, x1, y1, x2, real brand Glucophage online, y2, Glucophage mg, x3, y3){

      drawLine(ctx, color, order Glucophage online c.o.d, x1, Order Glucophage online overnight delivery no prescription, y1, x2, y2);

      drawLine(ctx, generic Glucophage, color, Canada, mexico, india, x2, y2, x3, Glucophage canada, mexico, india, y3);

      drawLine(ctx, color, x3, y3, x1, y1);

  }


 

 

All we need to do is; pass in the 2D context, the color, the three coordinates for vertices of the triangle, and connect the vertex coordinates using lines.

 

Putting it all together:

 

To draw the triangle during page load we will use the following code, which includes the previously mentioned code for getting the canvas context:

 

 







function drawOnCanvas(){

     var myCanvas = document.getElementById("canvas");  

     var ctx = myCanvas.getContext("2d");

     // we pass coordinates of vertices of the triangle, color etc.

     drawTriangle(ctx, "#FF0000", 10, 10, 10, 100, 100, 100);

  }


 

Next we call this from <body> tag on page “onLoad” event:

 

 







<body onLoad="drawOnCanvas();">

 

 

And that’s it. After you save and open the html file, you can see the following result on the browser:

 

 








[2]



 

 

Link to live demo of Hello Triangle: http://www.antonyrajiv.com/html5demo/helloTriangle.html [3]

 

Conclusion:

 

This was very short introduction to the world of HTML5; we just looked at one main part of it - the canvas element, Glucophage For Sale. There is a lot more which we haven't explored, but it should hopefully give you a feel of the possibilities of the new standard. Don't be fooled by the simple looking triangle drawing demo, we can build complete games using just HTML5 and JavaScript.

 

To demonstrate what is possible with <canvas> and the 2D graphics API, here is a short video and link to a game I co-developed, built entirely using HTML5 and JavaScript.

 

 

 








[4]


Video Embed Link: http://www.youtube.com/watch?v=ir2Tz9DVqh0 [5]

URL To Play in Browser: http://www.relfind.com/game/magician.html [6]

Video/Game credits: Brunda Merinal & Antony Rajiv


 

 

 

For “Hello Triangle” and more HTML5 canvas example source code, check out my github repository:

 

https://github.com/alpha2k/HTML5Demos/tree/master/Canvas [7]


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