PART IV: DYNAMIC HTML5 TAGS PLUS A LITTLE JAVASCRIPT AND PHP in .NET framework

Generator QR in .NET framework PART IV: DYNAMIC HTML5 TAGS PLUS A LITTLE JAVASCRIPT AND PHP
PART IV: DYNAMIC HTML5 TAGS PLUS A LITTLE JAVASCRIPT AND PHP
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sunsetGradient.addColorStop(0, yellow ); sunsetGradient.addColorStop(1, #cc0000 ) contextNow.fillStyle = sunsetGradient;
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In this particular example, the gradient is a vertical one. The first color, yellow, is at the top, and the second color, red, is at the bottom. Putting it all together, the following script (Sunset.html in this chapter s folder at www.wiley.com/go/smashinghtml5) creates a sunset for you.
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<!DOCTYPE HTML> <html> <head> <script type= text/javascript > CanvasMaster=new Object(); CanvasMaster.showCanvas=function() { canvasNow = document.getElementById( sunset ); contextNow = canvasNow.getContext( 2d ); sunsetGradient=contextNow.createLinearGradient(0, 0, 0,379); sunsetGradient.addColorStop(0, yellow ); sunsetGradient.addColorStop(1, #cc0000 ) contextNow.fillStyle = sunsetGradient; contextNow.beginPath(); contextNow.arc(200,200,150,0,Math.PI*2,false);
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contextNow.closePath(); contextNow.fill() </script> <style type= text/css > body { font-family:Verdana, Geneva, sans-serif; color:#cc0000; } </style> <meta http-equiv= Content-Type content= text/html; charset=UTF-8 > <title>Sunset</title> </head> <body onLoad= CanvasMaster.showCanvas() > <figure> <canvas id= sunset width= 400 height= 400 > A shame you can t see the beautiful sunset because you don t have an HTML5 browser. Aloha... </canvas> <figcaption> <p>Sunset</p> </figcaption> </figure> </body> </html>
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When you test the page, you ll see a big circle with a yellow-to-red gradient. You can use the same gradient technique with other shapes as well. Figure 13-16 is displayed in the mobile version of Safari on an iPhone.
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CHAPTER 13: THUNDERING YOUR SITE WITH CANVAS
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Figure 13-16: A circle with gradient ll.
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281 There s far more that you can do with canvas, and one of the best features of images created using canvas DOM objects is that they aren t as expensive (they don t take as much bandwidth) to load as bitmapped graphic files. We ve only skimmed the surface of this new powerful element in HTML5.
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TAKE THE WHEEL
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Working with canvas is so much fun and varied that it s hard to know where to begin. So, try the following little projects to test-drive this great new element in HTML5: In Figure 13-13, you see two line objects a briefcase and a house. See if you can draw the house using the methods employed for creating the briefcase. Take an image of a picture frame, and superimpose another image that appears to be in the frame. (This project requires you to fix the frame and image sizes so that one will fit in the other.) Find or create a digital photo and superimpose a sunset on top of it. (Alternatively, create an image with another kind of gradient and superimpose it on a digital photo or other image. What about a gradient filter )
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SMASHING HTML5
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ADDING FORMS
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ONE OF THE most important features of any Web page is its ability to interact with a person. In computer science lingo, there s a subfield called human computer interface, which treats humans as another type of interface like a printer, USB drive, or Webcam. This doesn t dehumanize
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people using computers. Instead, it treats people like something they re not, and that s bound to get you in trouble sooner or later. This chapter shows both how to add interactive forms and treat people like people.
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PART IV: DYNAMIC HTML5 TAGS PLUS A LITTLE JAVASCRIPT AND PHP
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ADDING A FORM
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Forms are really in two parts (even more in some cases). The first part is the <form> tag that sets up a container for different kinds of input. The typical form can be envisioned as the following: Begin Form Input 1 Input 2 Input 3 Input 4 End Form So in discussing forms, we re really talking about the form and its attributes and input elements and their attributes. With HTML5 forms, you ll find plenty of new attributes and elements. Just so that you don t get bored, the following (degree2radians.html in this chapter s folder at www.wiley.com/go/smashinghtml5) is an example of a simple calculator for converting degrees into radians (see 13 for a practical use for the converter). Just enter the degrees you want converted, and you ll be presented with the equivalent radians. 284
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<!DOCTYPE HTML> <html> <head> <script type= text/javascript > FormMaster=new Object(); FormMaster.resolveForm=function() { const RADCON=Math.PI/180; degreesNow=document.converter.degrees.value; radiansNow=degreesNow * RADCON; document.converter.radians.value=radiansNow; } </script> <style type= text/css > /*048ABF,049DBF,F2F2F2,595959,0D0D0D */ h3 { font-family: Arial Black , Gadget, sans-serif; color:#595959; } body { font-family:Verdana, Geneva, sans-serif; color:#049DBF; background-color:#0D0D0D; } </style> <meta http-equiv= Content-Type content= text/html; charset=UTF-8 >
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