Graphics vector generator setup technique

Abstract From the Canadian patent

Method and apparatus for setting up a graphics vector generator includes means for computing values representative of difference functions between delta Y values and delta X values for a vector to be drawn; means for storing such functions; means for storing a sign of said difference functions for, controlling X Y, swap and multiplex, operations; X, Y swap means for swapping X, values and Y values in response to said sign storage to present a larger of an X function or a Y function to a control means for controlling a number of iterations in, generation of a vector; and iteration counter means for controlling a number of iterations in generation of a vector.