| 摘要 |
PURPOSE:To display a graph with wavy lines under a clear and natural condition by obtaining a graphic pattern with an abbreviation waveform by using the content of a graphic memory by means of an abbreviation waveform delineation controlling section. CONSTITUTION:An auto-scaling control section 30 outputs information for appointing an area relevant for displaying the abbreviation waveform of a graphic memory to a graph delineation control section 40 and, at the same time, a seizure signal to an abbreviation waveform delineation control section 50. The control section 50 obtains a graphic pattern, from which each bit corresponding to an area in the abbreviation waveform is cut off by performing AND-addition 51 on a pattern for erasing display and a graphic pattern in the area relevant for displaying the abbreviation waveform at the unit of a prescribed bit. Then the control section 50 performs OR-addition 53 on the obtained graphic pattern and a pattern for display at the unit of a prescribed bit and obtains a graphic pattern with an abbreviation waveform. This pattern is written in the original area of the graphic memory in the control section 40 at the unit of a prescribed bit and displayed on a monitor 60.
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