var PhysicsControl = {};

PhysicsControl.applyGravity = function(objects, fdelta) {
    for (var i=0; i<objects.length; i++) {
        var obj = objects[i];

        if (obj.dragging || obj.y == 500) {
            continue;
        } else if (obj.y < 500) {
            obj.y = creatine.clip(obj.y+1000*fdelta, -100, 500)
        } else if (obj.y > 500) {
            obj.y = 500;
        }
    }
}

PhysicsControl.applyDragForce = function(objects, fdelta) {
    for (var i=0; i<objects.length; i++) {
        var obj = objects[i];

        if (!obj.dragging && obj.dragForce > 0) {
            if (obj.dragAllowX) {
                obj.x -= obj.dragDirX*obj.dragForce*obj.dragFriction;
            }
            if (obj.dragAllowY) {
                obj.y -= obj.dragDirY*obj.dragForce*obj.dragFriction;
            }
            
            obj.dragForce = creatine.clip(obj.dragForce-50*fdelta, 0, 40);
        }
    }
}