# enchant.js 小テスト1-3
## 課題: coinの作成
## タスク:
coinは0.5秒に1回(core.frame % 15 == 0)X座標はランダム、y座標は0に出現し下に5の速さで落ちていきます。
### ヒント
りんごキャッチのりんごと同じように落ちていきます。
コイン作成はrootSceneの"enterframe"内で作ります。
コインの動作はコインのクラスの中に記述していきます。

### 開始コード:

enchant();

window.onload = function() {
const PLAYER = 'player.png';
const COIN = 'coin.png';
const ENEMY = 'enemy.png';
const DISP_SIZE = 320;
const TIME = 30;
var score = 0;

var core = new Core(DISP_SIZE, DISP_SIZE);
core.preload(PLAYER, COIN, ENEMY);
core.fps = 30;
core.onload = function() {
var player = new Sprite(100, 100);
player.x = DISP_SIZE / 2;
player.y = DISP_SIZE - player.height * 2;
player.image = core.assets[PLAYER];

player.on('enterframe', function() {
if (core.input.left) {
this.x -= 5;
}

if (core.input.right) {
this.x += 5;
}
});

core.rootScene.addChild(player);

var scoreLabel = new Label('Score: ' + score);
scoreLabel.x = 10;
scoreLabel.y = 10;
core.rootScene.addChild(scoreLabel);
var Coin = Class.create(Sprite, {
initialize: function(x, y) {
Sprite.call(this, 16, 16);
this.x = ;
this.y = ;
this.image =

this.on('', function() {

});
}
});
core.rootScene.on('enterframe', function() {
scoreLabel.text = 'Score: ' + score;
if () {
core.rootScene.addChild(coin);
}

if (core.frame === core.fps * TIME) {
core.stop();
}
});

//上記のコインのコード、rootScene"enterframe"を完成させてください。

};
core.start();
};

function rand(n) {
return Math.floor(Math.random() * (n + 1));
}
<details>
<summary>解答</summary>

enchant();

window.onload = function() {
const PLAYER = 'player.png';
const COIN = 'coin.png';
const ENEMY = 'enemy.png';
const DISP_SIZE = 320;
const TIME = 30;
var score = 0;

var core = new Core(DISP_SIZE, DISP_SIZE);
core.preload(PLAYER, COIN, ENEMY);
core.fps = 30;
core.onload = function() {
var player = new Sprite(100, 100);
player.x = DISP_SIZE / 2;
player.y = DISP_SIZE - player.height * 2;
player.image = core.assets[PLAYER];

player.on('enterframe', function() {
if (core.input.left) {
this.x -= 5;
}

if (core.input.right) {
this.x += 5;
}
});

core.rootScene.addChild(player);

var scoreLabel = new Label('Score: ' + score);
scoreLabel.x = 10;
scoreLabel.y = 10;
core.rootScene.addChild(scoreLabel);

var Coin = Class.create(Sprite, {
initialize: function(x, y) {
Sprite.call(this, 16, 16);
this.x = x;
this.y = y;
this.image = core.assets[COIN];

this.on('enterframe', function() {
this.y += 5;
if (this.intersect(player)) {
core.rootScene.removeChild(this);
score++;
}
});
}
});
core.rootScene.on('enterframe', function() {
scoreLabel.text = 'Score: ' + score;
if (core.frame % 15 === 0) {
var coin = new Coin(rand(DISP_SIZE - 16), 0);
core.rootScene.addChild(coin);
}
if (core.frame === core.fps * TIME) {
core.stop();
}
});

});

core.start();
};

function rand(n) {
return Math.floor(Math.random() * (n + 1));
}
</details>