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<script>
//·£´ýÇÑ Á¤¼ö »ý¼º
function nextRandomInteger(limit) {
        return Math.round(Math.random() * limit);
}

//·£´ýÇÑ ¾ËÆĺª ¸®ÅÏ
var alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
function randomAlphabet(){
        return alphabet.charAt(nextRandomInteger(25));        
}

//¾ç¼ö¿Í À½¼öÀÇ ·£´ýÇÑ ¼Óµµ »ý¼º
function randomSpeed(maxSpeed){
        return Math.random() * maxSpeed - Math.random() * maxSpeed;
}
</script>

<script>
//Moving TextÀÇ »ý¼ºÀÚ ÇÔ¼ö
var canvasWidth = 700;
var canvasHeight = 400;

function MovingText(){
        this.x = nextRandomInteger(canvasWidth);
        this.y = nextRandomInteger(canvasHeight);
        this.vx = randomSpeed(10);
        this.vy = randomSpeed(10);
        
        //¹®¼­°´Ã¼ »ý¼º
        this.body = document.createElement('h1');
        this.body.innerHTML = randomAlphabet();
        this.body.style.position = 'absolute';
        
        //¹®¼­°´Ã¼¸¦ document.body¿¡ Ãß°¡
        document.body.appendChild(this.body);
}

MovingText.prototype.move = function(){
        //¹üÀ§°Ë»ç
        if(this.x < 0 || this.x > canvasWidth) {this.vx *= -1;}
        if(this.y < 0 || this.y > canvasHeight) {this.vy *= -1;}
        
        //À̵¿
        this.x += this.vx;
        this.y += this.vy;
        
        //È­¸é¿¡ À̵¿Ç¥½Ã
        this.body.style.left = this.x + 'px';
        this.body.style.top = this.y + 'px';
};
</script>

<script>
window.onload = function(){
        var movingTexts = [];
        
        for(var i = 0; i<100; i++){
                movingTexts.push(new MovingText());
        }
        
        setInterval(function(){
                for(var i in movingTexts){
                        movingTexts[i].move();
                }
        }, 1000/60);
};
</script>
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