onClipEvent (load) {
    x = _x;
    y = _y;
    xv = 0;
    yv = 0;
    mx = 0;
    my = 0;
    vfactor  = 0.9;
    friction = 0.5;
}
 
on (press) {
    drag = 1;
    mx = _parent._xmouse - this._x;
    my = _parent._ymouse - this._y;
}
 
on (release, releaseOutside) {
    drag = 0;
    xv = (x-ox) * vfactor;
    yv = (y-oy) * vfactor;
}
 
onClipEvent (enterFrame) {
    if(drag){
        ox = x;
        oy = y;
        // 回転中心設定
        var rad = Math.atan2(my, mx);
        var center_x = Math.cos(rad);
        var center_y = Math.sin(rad);
        var dis = my / center_y;
        x = _parent._xmouse - dis * center_x;
        y = _parent._ymouse - dis * center_y;
    }else{
        x += xv;
        y += yv;
    }
    // 慣性処理
    xv = xv * friction;
    yv = yv * friction;
    _x = x;
    _y = y;
}