| 摘要 |
PURPOSE:To attain quickly the thick line processing of a circle with simple hardware constitution by producing the thick line processing data based on the data once produced and storing the result, and vector-developing the thick line processing data onto an image memory. CONSTITUTION:The circle drawing outputs 11 and 12 fed from an arithmetic part 6 are fetched by MPX29 and 30 and also by an addition/subtraction circuit 26. The circuit 26 stores the thick line drawing data 11' and 12' obtained from the conversion processing data outputted from a drawing range monitor circuit 31 through addition/subtraction to a memory circuit 27. At the same time, the circle drawing data 11 and 12 selected by the MPX29 and 30 are outputted to a vector developing part 25 for drawing a circle. When the drawing action is closed, an end signal 13 is outputted to an MPU7 from the part 25. The circuit 31 monitors the changing points of areas 1-4 divided from the circle with a start signal 3. Thus, the circuit 31 monitors whether the operation is carried out normally or not with each of the areas 1-4 and also outputs the conversion processing data for operation which is used by an addition/ subtraction area 26 for each of the areas 1-4. |
