Vector graphics generator set-up

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(11)

EP 0 229 694 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	22.11.1990 Bulletin 1990/47

(43)	Date of publication A2:
	22.07.1987 Bulletin 1987/30

(21)	Application number: 87300126.7

(22)	Date of filing: 08.01.1987

(51)	International Patent Classification (IPC)⁴: G09G 1/16

(84)	Designated Contracting States:
	DE FR GB IT

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Priority:

17.01.1986 US 820763

(71)	Applicant: International Business Machines Corporation
	Armonk, N.Y. 10504 (US)

(72)	Inventors:
	Corona, James Kingston New York 12401 (US) Lindgren, Terence Wallace Rosendale New York 12472 (US)

(74)	Representative: Burt, Roger James, Dr.
	IBM United Kingdom Limited Intellectual Property Department Hursley Park Winchester Hampshire SO21 2JN Winchester Hampshire SO21 2JN (GB)

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References cited: :

(54)	Vector graphics generator set-up

(57) Setting up a graphics vector generator computing values representative of difference functions between delta Y values and delta X values for a vector to be drawn; storing such functions; storing a sign of the difference functions for controlling X, Y, swap and multiplex operations; swapping X values and Y values in response to the stored sign 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 using an iteration counter to control the number of iterations performed in generation of a vector.

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