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.

公开(公告)号：DE3786408D1

公开(公告)日：1993-08-12

申请号：DE3786408

申请日：1987-01-08

Applicant: IBM

Inventor： CORONA JAMES ,  LINDGREN TERENCE WALLACE

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

Abstract: The vector generator includes apparatus for setting up the generator and computes values representative of difference functions between Delta Y values and Delta X values for a vector to be drawn. The computer values are stored and a sign for each of the difference functions is stored for controlling XY swap and multiplex operations. A swap unit swaps X values and Y values in response to the store sign to present a larger of an X function or a Y function to a controller for controlling a number of iterations in generation of a vector. An iteration counter controls a number of iterations in generation of a vector.

公开(公告)号：CA1272314A

公开(公告)日：1990-07-31

申请号：CA523773

申请日：1986-11-25

Applicant: IBM

Inventor： CORONA JAMES ,  IIDA YOSHIO

IPC: G06T11/20 ,  G09G1/10 ,  G09G5/20 ,  G09G1/16

Abstract: A technique is described for efficiently drawing wide lines in a graphics display system by method and apparatus which includes means for identifying a wide line to be drawn; drawing a first line of pixels of said wide line; determining if a next line in said wide line has a different first coordinate value from a first coordinate value of said first line; generating at least one additional pixel value for said next line if said first coordinate value of said next line is different from said first coordinate value of an immediately previously drawn line; repeating said steps until said wide line has been completely drawn.

公开(公告)号：DE3786408T2

公开(公告)日：1994-01-20

申请号：DE3786408

申请日：1987-01-08

Applicant: IBM

Inventor： CORONA JAMES ,  LINDGREN TERENCE WALLACE

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

公开(公告)号：DE3787813T2

公开(公告)日：1994-05-05

申请号：DE3787813

申请日：1987-01-08

Applicant: IBM

Inventor： CORONA JAMES ,  IIDA YOSHIO

IPC: G06T11/20 ,  G09G1/10 ,  G09G5/20 ,  G09G1/16

Abstract: For efficiently drawing wide lines in a graphics display system, a method and apparatus are disclosed which identify a wide line to be drawn; draw a first line of pixels of the wide line; determine if a next pixel line in the wide line has a different first coordinate value from a first coordinate value of the first line; generate at least one additional pixel value for the next line if the first coordinate value of the next line is different from the first coordinate value of an immediately previously drawn line; this being repeated until the wide line has been completely drawn.

公开(公告)号：DE3787813D1

公开(公告)日：1993-11-25

申请号：DE3787813

申请日：1987-01-08

Applicant: IBM

Inventor： CORONA JAMES ,  IIDA YOSHIO

IPC: G06T11/20 ,  G09G1/10 ,  G09G5/20 ,  G09G1/16

Abstract: For efficiently drawing wide lines in a graphics display system, a method and apparatus are disclosed which identify a wide line to be drawn; draw a first line of pixels of the wide line; determine if a next pixel line in the wide line has a different first coordinate value from a first coordinate value of the first line; generate at least one additional pixel value for the next line if the first coordinate value of the next line is different from the first coordinate value of an immediately previously drawn line; this being repeated until the wide line has been completely drawn.