| 摘要 |
PURPOSE:To improve the effective speed of graphic drawing by saving and reloading only display attribute information which needs to be saved and reloaded at least in calling a display instruction group. CONSTITUTION:One of display instruction group stored in a display instruction storage part 1 is fetched and executed by a display execution part 2. When a display instruction statement is a drawing instruction which indicates the execution of drawing like circle drawing, the execution result is drawn on an output display part 3. When the display instruction statement is a display attribute instruction which indicates the phase of the display of a graphic drawn like line width specification and line color specification, the display attribute information stored in the current attribute information memory 9 in the display execution part 2 is updated. Further, when the display instruction statement is a call instruction which indicates the execution by calling another display instruction group, an area which is large enough to store all pieces of display attribute information at the call point of time is secured in the attribute information storage part 4 and the execution of the called display instruction group is started. |
