Download Pro HTML5 Programming, 2nd Edition by Peter Lubbers, Frank Salim, Brian Albers PDF

By Peter Lubbers, Frank Salim, Brian Albers

HTML5 is right here, and with it, internet purposes have bought strength, ease, scalability, and responsiveness like by no means prior to. With this ebook, builders will the best way to use the newest state-of-the-art HTML5 internet expertise - on hand within the newest models of recent browsers-to construct net purposes with unheard of performance, pace, and responsiveness. This new version contains significant revisions for WebSockets performance, reflecting the hot W3C specification. It additionally good points new chapters overlaying the drag-and-drop API in addition to SVG.

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Extra info for Pro HTML5 Programming, 2nd Edition

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Today, most developers use the classic setTimeout or setInterval calls to schedule changes to a web page or application. Both of these calls allow you to schedule a callback after a certain number of milliseconds, which then allows you to make changes to the page during the callback. However, there are some significant problems with using that approach: • As a developer, you need to guess at the appropriate number of milliseconds in the future to schedule the next update. With the modern Web running on a wider variety of devices than ever, it is tricky to know the suggested frame rate for a highpowered desktop device versus a mobile phone.

Listing 2-10 shows some basic commands that can modify the properties of the context in order to make the stroked shape look more appealing. Listing 2-10. info CHAPTER 2  USING THE CANVAS API By adding the above properties before stroking, we change the appearance of any future stroked shapes—at least until we restore the context back to a previous state. First, we increase the width of the stroked lines to four pixels. Next, we set the lineJoin property to round, which causes the joints of our shape’s segments to take on a more rounded corner shape.

Restore(); As before, one of the first things we will do is save our canvas context state, because we will be modifying the translation and stroke options here. For our forest path, we will start by moving back to the origin and drawing a first quadratic curve up and to the right. As shown in Figure 2-10, the quadraticCurveTo function begins at the current drawing location and takes two x, y point locations as its parameters. The second one is the final stop in our curve. The first one represents a control point.

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