2016年6月2日木曜日

開発環境

Javascript for Kids (Nick Morgan 著、Angus Croll 寄稿、Miran Lipovaca イラスト、No Starch Press)のPart 2(Advanced JavaScript)、Chapter 12(Object-Oriented Programming)、PROGRAMMING CHALLENGES(No. 3417)を取り組んでみる。

PROGRAMMING CHALLENGES(No. 3417)

コード(Emacs)

<!doctype html>
<html>
  <head>
    <title>Find the buried treasure! </title>
  </head>
  <body>
    <div id="div0" style="height:450px">
    </div>
    <div id="div1">
      <button id="start0">start</button><button id="restart0">restart</button>
    </div>
    
    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.0.0-beta1/jquery.min.js"></script>
    <script src="car.js"></script>
  </body>
</html>
/*jslint         browser : true, continue : true,
  devel  : true, indent  : 4,    maxerr   : 50,
  newcap : true, nomen   : false, plusplus : false,
  regexp : false, sloppy  : true, vars     : false,
  white  : false
*/
/*global $*/
var Car,
    tesla,
    nissan,
    timer,
    $div = $('#div0'),
    $start = $('#start0'),
    $restart = $('#restart0'),
    div_left = $div.position().left,
    div_top = $div.position().top;

Car = function (x, y) {
    this.x = x;
    this.y = y;

    this.draw();
};
Car.prototype.draw = function () {
    var car_html = '<img src="http://nostarch.com/images/car.png">';

    this.car_element = $(car_html);
    this.car_element.css({
        position: 'absolute',
        left: this.x,
        top: this.y
    });

    $div.append(this.car_element);
};

Car.prototype.moveRight = function (distance) {
    this.x += distance;
    this.car_element.css({
        left: this.x,
        top: this.y
    });
};

tesla = new Car(div_left + 20, div_top + 150);
nissan = new Car(div_left + 20, div_top + 300);

$('#div1').css({
    position: 'absolute',
    top: div_top + 350
});

$start.click(function () {
    timer = setInterval(function () {
        var tesla_speed = Math.floor(Math.random() * 6),
            nissan_speed = Math.floor(Math.random() * 6);

        tesla.moveRight(tesla_speed);
        nissan.moveRight(nissan_speed);
    }, 30);
});
$restart.click(function () {
    clearInterval(timer);
    $div.html('');
    tesla = new Car(div_left + 20, div_top + 20);
    nissan = new Car(div_left + 20, div_top + 150);
});

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