3179G graphics coordinates

IBM 3179G graphics coordinates divide the Reflection window into 384 vertical units and 720 horizontal units. The coordinate pair (0,0) is the center of the window. The value of the y-coordinate ranges from 191 at the top of the window to -192 at the bottom of the window. The value of the x-coordinate ranges from -360 at the left edge of the window to 359 at the right edge of the window. If you change the size and shape of your Reflection window, the relative position of any pair of coordinates remains the same within the window.