| 摘要 |
PURPOSE:To draw the digure with angles at high speed with high accuracy by smoothly changing the length of rectangular beams by utilizing the scanning signals of electron beams. CONSTITUTION:Data to be drawn 22 are set to buffer registers 23, the coordinates of the figure are arithmetically operated by means of the Y coordinate arithmetic circuit 24 and X coordinate arithmetic circuit 29 of a coordinate arithmetic circuit 37, and value required is obtained. The results of the arithmetical operation are transmitted to a figure discriminating circuit 25, and the parameters of characteristics displaying the characteristics of the figure are calculated by means of the circuit 25 and transmitted to a ROM26. The ROM26 uses the parameters as address value, and value previously written is outputted, and forwarded to an output control circuit 27. Output gate control signals 34 outputted from the circuit 27 are given to an output gate 28, data needed are selectively controlled from Y coordinate output 32 and X coordinate output 33 by the signals 34 in the gate 28, and output 35 for drawing is successively outputted, and written to a drawing memory. |
