부드러운 움직임 2
//관성력
MovieClip.prototype.inertiaMove = function(widthX,heightY,g,fric){
if(this._x + this.speedX > widthX - this._width/2){
this.speedX = -1*this.speedX;
this._x = widthX - this._width/2;
}else if(this._x + speedX <0 + this._width/2){
this.speedX = -1*this.speedX;
this._x = 0 + this._width/2;
}else{
this._x += this.speedX ;
}
if(this._y + this.speedY > heightY - this._height/2){
this.speedY = -1*this.speedY;
this._y = heightY - this._height/2;
}else if(this._y + this.speedY <0 + this._height/2){
this.speedY = -1*this.speedY;
this._y = 0 + this._height/2;
}else{
this._y += this.speedY;
}
this.speedY = this.speedY + g;
this.speedX = fric*this.speedX;
this.speedY = fric*this.speedY;
};
//포물선운동
MovieClip.prototype.parabolaMove = function(){
this.vy = this.vy + this.g;
this._x = this._x + this.vx;
this._y = this._y + this.vy;
};