# enchant.js 小テスト1-4
## 課題: enemy,gameOverSceneの作成
## タスク:
enemyは1秒に1回(core.frame % 30 == 0)X座標はランダム、y座標は0に出現し下に8の速さで落ちていく。
ゲームシーンを作る。
playerがenemyにあたるとゲームオーバーになる。
gameoverSceneを作る。

### 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。
coinと動作は同じです。

### 開始コード:

enchant();

window.onload = function() {
const PLAYER = 'player.png';
const COIN = 'coin.png';
const ENEMY = 'enemy.png';
const DISP_SIZE = 640;
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;
core.pushScene(gameOverScene);
if (this.intersect(player)) {
core.rootScene.removeChild(this);
score++;
}
});
}
});
//ここに敵のスプライトを記述
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);
}
//ここに敵の生成のコードを記述

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

};

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++;
}
});
}
});
var Enemy = Class.create(Sprite, {
initialize: function(x, y) {
Sprite.call(this, 32, 32);
this.x = x;
this.y = y;
this.image = core.assets[ENEMY];

this.on('enterframe', function() {
this.y += 3;
if (this.intersect(player)) {
core.pushScene(gameOverScene)
}
});
}
});

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 % 30 === 0) {
var enemy = new Enemy(rand(DISP_SIZE - 32), 0);
core.rootScene.addChild(enemy);
}
if (core.frame === core.fps * TIME) {
core.stop();
}
});

var gameOverScene = new Scene();
gameOverScene.backgroundColor = 'black';

var GOlabel = new Label();
GOlabel.x = 180;
GOlabel.y = 200;
GOlabel.font = '40px Hiragino';
GOlabel.text = "GAME OVER";
GOlabel.color = 'white';
gameOverScene.addChild(GOlabel);

core.start();
};

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