簡単なシューティングゲーム作成 その８

今回は敵の種類を増やしてみる。画像はEnemy1を使う。まずはobject/Enemy2.js。Eneym1がただ横に移動してただけに対して、斜め移動をするようにした。スコアも2倍にしておく

var Enemy2 = function(image){
    this.position = new Point();
    this.rect = new Rect();
    
    this.life = 100;
    this.damage = 100;
    this.score = 2;
    this.moveUP = true;
    
    var fireCount = 0;
    
    this.draw = function(context){
        context.drawImage(image, this.position.x, this.position.y);
    }
    
    this.doAction = function(info){
        this.doMove(info);
        fireCount = (fireCount + 1) % 100;
        
        if(fireCount == 0){
            var bullet = new EnemyBullet1(-4, 0);
            bullet.move(this.position.x + 2, this.position.y + 16);

            info.enemyBullets.push(bullet);
        }
    }
    
    this.doMove = function(info){
        if(this.moveUP){
            this.dmove(-2, -2);
            
            if(this.position.y < 20){
                this.moveUP = false;
            }
        }else{
            this.dmove(-2, 2);
            
            if(this.position.y > info.height - 20){
                this.moveUP = true;
            }
        }
    }

    this.getRect = function(){
        this.rect.left = this.position.x + 2;
        this.rect.top = this.position.y + 10;
        this.rect.right = this.position.x + 72;
        this.rect.bottom = this.position.y + 22;
        
        return this.rect;
    }
}

Enemy2.prototype = new GameObject();

次にHTMLでEnemy2.jsを読み込むようにする。

<script type="text/javascript" src="./object/Enemy2.js"></script>

次にevent/EventList.jsでEnemy2の出現タイミングと出現位置を定義しておく

var eventlist = [
    {"name": "Enemy1", "frame": 0, "x": 650, "y": 100},
    {"name": "Enemy1", "frame": 1, "x": 650, "y": 200},
    {"name": "Enemy2", "frame": 100, "x": 650, "y": 200},
    {"name": "Enemy2", "frame": 120, "x": 650, "y": 200}
]

最後にview/GameView.jsのcheckEvent。ここでEnemy2を出現するようにしておく

function checkEvent(){
    if(eventlist[eventIndex] && eventlist[eventIndex].frame == frame){
        var entry = eventlist[eventIndex];

        if(entry.name == "Enemy1"){
            var enemy = new Enemy1(images["Enemy1"]);
            enemy.move(entry.x, entry.y);
            gameInfo.enemies.push(enemy);
        }else if(entry.name == "Enemy2"){
            var enemy = new Enemy2(images["Enemy1"]);
            enemy.move(entry.x, entry.y);
            gameInfo.enemies.push(enemy);
        }
            
        eventIndex++;
    }
}