September 2007
Beginner to intermediate
432 pages
17h 48m
English
Content preview from Making Things Talk
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66 MAKING THINGS TALK
void animateBall() {
// if the ball is moving left:
if (xDirection < 0) {
// if the ball is to the left of the left paddle:
if ((xPos <= leftPaddleX)) {
// if the ball is in between the top and bottom
// of the left paddle:
if((leftPaddle - (paddleHeight/2) <= yPos) &&
(yPos <= leftPaddle + (paddleHeight /2))) {
// reverse the horizontal direction:
xDirection =-xDirection;
}
}
}
// if the ball is moving right:
else {
// if the ball is to the right of the right paddle:
if ((xPos >= ( rightPaddleX + ballSize/2))) {
// if the ball is in between the top and bottom
// of the right paddle:
if((rightPaddle - (paddleHeight/2) <=yPos) &&
(yPos <= rightPaddle + (paddleHeight /2))) {
// reverse the horizontal direction:
xDirection =-xDirection;
}
}
}
// if the ball goes off the screen left:
if (xPos < 0) {
resetBall();
}
// if the ball goes off the screen right:
if (xPos > width) {
resetBall();
}
// stop the ball going off the top or the bottom of the screen:
if ((yPos - ballSize/2 <= 0) || (yPos +ballSize/2 >=height)) {
// reverse the y direction of the ball:
yDirection = -yDirection;
}
// update the ball position:
xPos = xPos + xDirection;
yPos = yPos + yDirection;
// Draw the ball:
rect(xPos, yPos, ballSize,
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.