公开(公告)号：CA1263775A

公开(公告)日：1989-12-05

申请号：CA523772

申请日：1986-11-25

Applicant: IBM

Inventor： CORONA JAMES ,  LINDGREN TERENCE W

IPC: G06T11/20 ,  G09G5/20 ,  G09G1/16

Abstract: 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.