Arduino Uno Quick Start Manual page 131

Eventually, we add our own
our usual bind trick.
The onReadLine listener interprets the data we get from the Arduino:
BrowserGame/GameController/js/game_controller.js
GameController.prototype.onReadLine = function(line) {
const TOLERANCE = 5;
var attr = line.trim().split('
if (attr.length == 4) {
this.moveRight = false;
this.moveLeft = false;
var x = parseInt(attr[0]);
if (x <= this.threshold - TOLERANCE) {
this.moveLeft = true;
} else if (x >= this.threshold + TOLERANCE) {
this.moveRight = true;
}
this.buttonPressed = (attr[3] == '1');
}
var message = 'moveLeft('
'moveRight (' + this.moveRight +
'buttonPressed(' + this.buttonPressed + ')';
console.log(message);
document.getElementById('output').innerText = message;
}
The method splits the line it receives at each blank character. Then it makes
sure that the line contains exactly four attributes. If yes, it checks whether
the current X position is to the left or to the right of the controller s tipping
point. Note that we use the threshold value here to make the movement
detection smoother.
Finally, the method checks whether the controller s button is currently
pressed. Also, it writes the controller s current state to the console.
By the way, if you d like to control the game using a Nunchuk later on (see
Chapter 9, Tinkering with the Wii Nunchuk, on page
adjust the GameController
In Figure 22, The game controller communicates with a Chrome app, on page
114, you can see the output of a sample Chrome app that outputs the game
controller s state to the JavaScript console.
We can now conveniently combine Chrome apps with our motion-sensing
controller. In the next section, you ll learn how to create a more advanced
application using these techniques.
onReadLine listener to the
');
+ this.moveLeft +
'), ' +
class.
www.it-ebooks.info
Writing a GameController Class
SerialDevice object and use
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145), you only have to
113
report erratum discuss