function IVCDIJoystickClass(target)
{
	this.target = target;

	/* scale any axis and/or invert polarity */
	this.xScale = 1;
	this.yScale = 1;
	this.zScale = 1;
	/* offset when any axis is not centered at 0 */
	this.xOffset = 0;
	this.yOffset = 0;
	this.zOffset = 0;
	/* pedestal threshold when any axis fluctuate at center */
	this.xPedestal = 0;
	this.yPedestal = 0;
	this.zPedestal = 0;

	this.getDeviceCount = function()
	{
		return (this.target.GetDeviceCount());
	}

	this.acquireDevice = function(which)
	{
		return (this.target.Acquire(which));
	}
	
	this.unacquireDevice = function()
	{
		return (this.target.Unacquire());
	}

	this.setPollInterval = function(milliseconds)
	{
		this.target.PollInterval = milliseconds;
	}

	this.setXYZScale = function(x,y,z)
	{
		this.xScale = x;
		this.yScale = y;
		this.zScale = z;
	}

	this.setXRange = function(min,max)
	{
		this.target.XMin = min;
		this.target.XMax = max;
	}

	this.setYRange = function(min,max)
	{
		this.target.YMin = min;
		this.target.YMax = max;
	}

	this.setZRange = function(min,max)
	{
		this.target.ZMin = min;
		this.target.ZMax = max;
	}

	this.clearXYZCalibration = function()
	{
		this.xOffset = 0;
		this.yOffset = 0;
		this.zOffset = 0;
	}

	this.setXYZCalibration = function()
	{
		this.xOffset = -this.target.X;
		this.yOffset = -this.target.Y;
		this.zOffset = -this.target.Z;
	}

	this.setXYZPedestal = function(x,y,z)
	{
		this.xPedestal = x;
		this.yPedestal = y;
		this.zPedestal = z;
	}

	this.poll = function()
	{
		this.target.Poll();
	}

	this.getX = function()
	{
		var x = (this.target.X + this.xOffset) * this.xScale;
		return (this.xPedestal <= Math.abs(x) ? x : 0);
	}

	this.getY = function()
	{
		var y = (this.target.Y + this.yOffset) * this.yScale;
		return (this.yPedestal <= Math.abs(y) ? y : 0);
	}
	
	this.getZ = function()
	{
		var z = (this.target.Z + this.zOffset) * this.zScale;
		return (this.zPedestal <= Math.abs(z) ? z : 0);
	}
	
	this.getB = function(which)
	{
		return (eval("this.target.B" + which));
	}
}

function createIVCDIJoystick()
{
	var joystickControl = new ActiveXObject("ivc_di.Joystick");
	
	return (new IVCDIJoystickClass(joystickControl));
}