The Essential Guide to HTML5
DICE GAME bank +=20; Use the += operator to increase the value of bank by 20 document.f.bank.value = String(bank); Put the strin ...
CHAPTER 2 use several built-in features of JavaScript, including the Math.random and Math.floor methods use if and switch state ...
Chapter 3 Bouncing Ball In this chapter, we will cover: creating programmer-defined objects using setInterval for animation dra ...
CHAPTER 3 Note: The kind of animation were going to produce is called computed animation, in which the position of an object is ...
BOUNCING BALL Figure 3-2. The ball is now an image from an external file. HTML5 lets you specify what the input should be. In th ...
CHAPTER 3 This set of applications demonstrates substantial programming but its not really a game, though people enjoy seeing h ...
BOUNCING BALL filled-in path. Notice that the arc method uses variables to specify the coordinates of the center of the circle a ...
CHAPTER 3 Let's take a break now. Its your turn, dear reader, to do some work. Consider the following HTML document: The Orig ...
BOUNCING BALL Gradients involve sets of colors. A typical practice is to write code to set what are called the color stops, such ...
CHAPTER 3 ["dish",10.50], ["rug",599.99] ]; This store has 4 items, with the cheapest being the dish, represented in the positio ...
BOUNCING BALL Depending on the institution, this could indicate grades of A, A-, B, C+, and B. The following snippet computes th ...
CHAPTER 3 An important point to note here is that since the code is drawing or painting the canvas, to produce the effect of a m ...
BOUNCING BALL It is often the case that you want to indicate the passage of time on the screen. The following example will displ ...
CHAPTER 3 Calculating a new position and collision detection Now that we know how to draw, and how to clear and redraw, and we k ...
BOUNCING BALL ballvy =-ballvy; } if (nbally < inboxboundy) { nbally = inboxboundy; ballvy = -ballvy; } ballx = nballx; bally ...
CHAPTER 3 HTML5 validation is not fully operational in all browsers, so I won't spend a lot of time on it. If youre using a com ...
BOUNCING BALL better than fewer, larger ones when youre developing applications. By the way, when doing your own programming, d ...
CHAPTER 3 Code Explanation var boxboundx = boxwidth+boxx-ballrad; Right boundary var boxboundy = boxheight+boxy-ballrad; Botto ...
BOUNCING BALL Code Explanation moveandcheck(); Do the check and the move the ball ctx.beginPath(); Start path ctx.arc(ballx, bal ...
CHAPTER 3 Code Explanation } Close clause if (nbally < inboxboundy) { Is the y value less than the top boundary? nbally = inb ...
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