usb binary mouse outputs

I want to create a converter to plug one end into a wii nunchuck and the other into your computer. I need to receive the signals and transmit them through a usb cable I cannot use the Mouse.h library to transmit signals from my arduino mega to my computer. I have resorted to finding the binary code for mouse outputs and so far have found 1010101 for left click and 1010110 for right click ( found at quora “What type of signal goes to computer from a mouse (USB type) if we press left click on an optical mouse?”) I cannot seem to find any information about how the mouse communicates x and y axis values to the computer. I don’t know where to find this information and I hope you nice people on sparkfun will help me.