var obj1 = _root.attachMovie("obj1","obj1"+_root.getNextHighestDepth(),_root.getNextHighestDepth(),{_x:100,_y:200});
obj1.xspeed = 0;
obj1.yspeed = 0;

var obj2 = _root.attachMovie("obj2","obj2"+_root.getNextHighestDepth(),_root.getNextHighestDepth(),{_x:450,_y:200});
obj2.xspeed = 0;
obj2.yspeed = 0;

var friction = .9;
var speed = 1.6;

function onEnterFrame() {

    if(Key.isDown(Key.RIGHT)) {
        obj1.xspeed -= speed;
    }
    if(Key.isDown(Key.LEFT)) {
        obj1.xspeed += speed;
    }
    if(Key.isDown(Key.DOWN)) {
        obj1.yspeed -= speed;
    }
    if(Key.isDown(Key.UP)) {
        obj1.yspeed += speed;
    }

    if(Key.isDown(65)) {
        obj2.xspeed += speed;
    }
    if(Key.isDown(68)) {
        obj2.xspeed -= speed;
    }
    if(Key.isDown(83)) {
        obj2.yspeed -= speed;
    }
    if(Key.isDown(87)) {
        obj2.yspeed += speed;
    }

    obj1._x -= obj1.xspeed;
    obj1._y -= obj1.yspeed;
    obj1.xspeed *= friction;
    obj1.yspeed *= friction;

    obj2._x -= obj2.xspeed;
    obj2._y -= obj2.yspeed;
    obj2.xspeed *= friction;
    obj2.yspeed *= friction;

    if(checkCollision()) {
        solveCollision(obj1, obj2);
    }

    if(obj1._x <= 10) {
        obj1._x = 10;
        obj1.xspeed = 0;
    }
    if(obj1._x >= 540) {
        obj1._x = 540;
        obj1.xspeed = 0;
    }
    if(obj1._y <= 10) {
        obj1._y = 10;
        obj1.yspeed = 0;
    }
    if(obj1._y >= 390) {
        obj1._y = 390;
        obj1.yspeed = 0;
    }

    if(obj2._x <= 10) {
        obj2._x = 10;
        obj2.xspeed = 0;
    }
    if(obj2._x >= 540) {
        obj2._x = 540;
        obj2.xspeed = 0;
    }
    if(obj2._y <= 10) {
        obj2._y = 10;
        obj2.yspeed = 0;
    }
    if(obj2._y >= 390) {
        obj2._y = 390;
        obj2.yspeed = 0;
    }

    obj1.xspeed = Math.min(obj1.xspeed, 8);
    obj1.yspeed = Math.min(obj1.yspeed, 8);
    obj1.xspeed = Math.max(obj1.xspeed, -8);
    obj1.yspeed = Math.max(obj1.yspeed, -8);

    obj2.xspeed = Math.min(obj2.xspeed, 8);
    obj2.yspeed = Math.min(obj2.yspeed, 8);
    obj2.xspeed = Math.max(obj2.xspeed, -8);
    obj2.yspeed = Math.max(obj2.yspeed, -8);
}

function checkCollision() {
    if(Math.abs(obj1._x-obj2._x) <= (obj1._width/2 + obj2._width/2) && Math.abs(obj1._y-obj2._y) <= (obj1._width/2 + obj2._width/2)) {
        return true;
    }
}

function solveCollision(obj1:MovieClip , obj2:MovieClip) {

    var x1:Number = obj1._x;
    var y1:Number = obj1._y;
    var dx:Number = obj2._x - x1;
    var dy:Number = obj2._y - y1;
    var dist:Number = Math.sqrt(dx * dx+dy * dy);

    var radius:Number = 10;

    var nX:Number = dx / dist;
    var nY:Number = dy / dist;

    var midpointX:Number = (x1 + obj2._x)/2;
    var midpointY:Number = (y1 + obj2._y)/2;

    obj1._x = midpointX-nX*radius;
    obj1._y = midpointY-nY*radius;
    obj2._x = midpointX+nX*radius;
    obj2._y = midpointY+nY*radius;

    var distanceVector:Number = (obj1.xspeed - obj2.xspeed) * nX + (obj1.yspeed - obj2.yspeed) * nY;
    var distVectorX:Number = distanceVector * nX;
    var distVectorY:Number = distanceVector * nY;

    obj1.xspeed -= distVectorX;
    obj1.yspeed -= distVectorY;

    obj2.xspeed += distVectorX;
    obj2.yspeed += distVectorY;
}