Antonelli, Terry & Wands
Figure displaying device
 A figure displaying device operates to display a plurality of fundamental figures each defined by a preset number of vectors on a display device of the raster scanning type. The figure displaying device stores the start and end point coordinates of the respective vectors of the respective fundamental figures and the gradient data of the respective vectors of the fundamental figures, and determines whether the respective vectors are located on a horizontal scanning line or not for each fundamental figure prior to the scanning operation of the horizontal scanning line. If the vectors are located on the horizontal scanning line the gradient data corresponding to the vectors on the aforementioned horizontal scanning line is read out and added to the start point coordinates thereby to renew the start point coordinates. A line memory is provided having a capacity corresponding to the number of picture elements in one horizontal scanning line so that preset data can be stored therein at the address corresponding to the added results and a control circuit is provided for consecutively reading the data out of the address in the line memory, which corresponds to the position of the horizontal scanning line being scanned, thereby to effect the display in accordance with the read results. 
Hitachi, Ltd. Hitachi Denshi Kabushiki Kaisha
G
G09G
inventional
Kazuyuki Kunihiro Takakazu Shigeru Yasutaka Takeyuki
Kodama Okada Huno Yabuuchi Shibuya Endo