| 摘要 |
PURPOSE:To attain the parallel arrangements of digital differential analyzers (DDAs) and to attain rapid drawing by providing the DDA with a shifted variable detector for detecting a shifted variable in accordance with the length of a straight line to be drawn. CONSTITUTION:The DDA is provided with a shifting circuit 3 for shifting the value of an inclination by a value corresponding to the length of a straight line to be drawn and the DDA is initialized by the output of the circuit 3. Namely the inclination value DELTAy 101 is shifted by a shifting value (n) by means of the circuit 3, the integer part of the output of the circuit 3 is added to the value of a Y counter 104, a part less than a decimal point is stored as a calculated result, and 2<n> is added to an X counter 105, so that same state as the calculation of the DDA 2<n> times is set up. Consequently, the DDA can be arranged in parallel with an ordinary DDA and rapid drawing can be attained. |
