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Stopping Method of Curve Drawing

IP.com Disclosure Number: IPCOM000065477D
Original Publication Date: 1985-Dec-01
Included in the Prior Art Database: 2005-Feb-19

Publishing Venue

IBM

Related People

Authors:
Iida, H Mamiya, J [+details]

Abstract

This article relates to the method of stopping the operation of drawing one line at a point where the line intersects another line (Fig. 1). The method described here shows that a coordinate (an X address and a Y address) which is generaled for drawing one line is checked whether the point of this generaled coordinate is already specified by another line with specified color. Fig. 2 shows one example of hardware which implements the above operation. An X address (except lower three bits) and a Y address generated from a quadratic curve signal generator designate one particular byte of an APA (all-points-addressable) buffer. The lower three bits of the X address designate one particular bit of said particular byte. These three bits are decoded and stored in a work register.