Hitachi, Ltd.

Mitsugu Yoneyama

Mitsuo Ooyama

Shigeo Tsujioka

Seiichi Kanema

Toshihisa Aoshima

Kiyoshi Umezawa

Eiji Okamura

Kimiaki Ando

An apparatus for filling an interior of a shape to be displayed on a raster scan CRT which reads out a refresh memory. The apparatus includes a memory for storing information of starting points and ending points for filling. The write of a filling color code into the refresh memory is initiated and terminates in response to the filling starting point and the filling ending point, respectively, but inhibited at its memory locations on the contour of the shape. The direction of the filling is perpendicular to the raster scanning of the CRT.

Filled shaped generating apparatus

A graphic display apparatus for generating a vector comprises registers for storing a value R of a vector discrimination, a positive increment P and a negative increment N, and flip-flops for storing magnitude information of .DELTA.X, .DELTA.Y, and .DELTA.X and .DELTA.Y. An address counter of a refresh memory is counted up or down in accordance with the contents of those flip-flops. A control circuit for updating the value R of the vector discrimination is also provided, so that the vector can be generated at a high speed. The registers and the flip-flops are constructed in two stages so that data for generating the next vector can be prepared while the current vector is generated.

Graphic display apparatus with a vector generating circuit

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Tokorozawa, Japan

Mitsugu Yoneyama