Curve generation in a display system

Details Curve generation in a display system Curve generation in a display system

G - Physics

09

G

375/36

G09G 1/14 (2006.01) G09G 1/08 (2006.01) G09G 5/20 (2006.01)

Patent

CA 1309523

UK9-85-011 CURVE GENERATION IN A DISPLAY SYSTEM ABSTRACT A curve generator for a display system comprises arc generation means for generating an arc of a circle from data defining the locations of two end points and an intermediate point on the arc. The arc generation means comprises initialisation means for calculating the angle subtended between a first vector, from a first of the end points to the intermediate point and a second vector from the second of the end points to the intermediate point and arc plotting means for defining a succession of further vectors from said first end point and for calculating, for each further vector, its point of intersection with a counterpart vector, from the second end point, with which it subtends said angle, whereby a succession of further points are plotted on the circular arc. The plotting logic thus plots the points of the arc with respect to a given point on the arc itself by generating vectors from that given point and enables the computation of the arc to be performed substantially within the system co-ordinate space in which the arc exists, which reduces the number of places of accuracy needed in order to accurately compute the arc.

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