JPS63223983A - Graphic drawing device - Google Patents

Abstract

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.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to calling and executing a display command group consisting of one or more display command statements while executing a display command group consisting of one or more display command statements, and The present invention relates to a graphic drawing device that executes display command statements subsequent to the calling command statement of the display command group of the calling source after the execution of the display command group is completed.

[Conventional technology]

Until now, when a group of display commands is called and executed while a group of display commands is being executed, the display attribute information of the caller is saved all at once at the time of the call. This idea is
“Algorithm child structure Mizozo =
The program is based on stacking in the subroutine Neil.

[Problem that the invention seeks to solve]

In the above conventional technology, in calling and executing a group of display commands,
When the display command group is called many times because no consideration is given to minimizing the amount of display attribute information saved for the calling display command group and reducing the overhead when calling the display command group. , there was a problem that the effective display performance deteriorated.

An object of the present invention is to reduce the overhead when calling a display command group by minimizing the amount of display attribute information of the display command group that is the calling source when calling the display command group.

[Means for solving problems]

The purpose of the above is that when calling a display command group, after securing an area where all the display attribute information of the calling display command group can be saved, the calling display command group is called using the display attribute information at the time of the call. Starts execution of the set of display commands. Then, when a command statement that changes display attribute information appears during the execution of a group of called display commands, only the display attribute information to be changed of the calling display command statement is saved to a pre-secured area. achieved.

[Effect]

The area secured when calling a group of display commands forms a stack with that unit as a unit. The actual contents of the stack are not determined until the display command group that is called changes the display attribute information, but since an area is secured to save all attribute information, a lack of space may occur depending on the amount of changes. There will never be a situation where evacuation becomes impossible.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, a display command group consisting of one or more display command sentences is stored in a display command storage section 1. One of the display commands stored in the display command storage section 1 is selected by the display execution section 2, and the display command sentences are fetched one by one to the display execution section 2 and executed. In the case of a drawing command that instructs the execution of drawing, such as drawing or circle drawing, the execution result is the display aspect of the figure to be drawn, such as the 0 display command statement drawn on the output display unit 3, such as line width specification and line color specification. If the display attribute command instructs , the display attribute information stored in the current attribute information memory 9 in the display execution unit 2 is updated. In addition, if the display command statement is a call command that calls another display command group and instructs its execution, an area that can store all the display attribute information at the time of the call is secured in the attribute information storage section 4, and the called display command Start the group execution.

The attribute information storage unit 4 includes a stack memory 5 and a stack pointer 6, and by increasing the value of the stack pointer 6, a storage area can be secured.

FIG. 1 is a flowchart showing the procedure for calling a display command group. When calling a group of display commands, first, in procedure 10, the stack pointer is increased to create an attribute storage area 8 for storing all display attribute information, and a storage area 8 for indicating whether each piece of display attribute information has been stored. Stack area for completed flag 7
Allocate in memory 5. Next, in procedure 11, all stored flags 7 in the area secured in procedure 10 are cleared. In procedure 12, the first display command sentence is retrieved from display command storage section 1, and in procedure 13,
It is determined whether or not this is the last of the display command group. If it is not the last display command group, it is determined in procedure 17 whether it is a call command for another display command group. If the command is not a call command for another display command group, it is determined in step 20 whether or not it is a display attribute command. A display command sentence that is not a display command is executed as a drawing command in procedure 25, and the output result is displayed on the output display section 3. After the procedure 25 is completed, the process returns to the procedure 112 and moves to execution of the next display command statement. If one display command statement is determined to be a display attribute command in procedure 20, then in procedure 21, the display attribute information at the time of calling of the calling display command group is newly set in the called display command group. It is determined by the stored flag 7 whether the same display attribute information has already been stored in the attribute storage area 8 secured in the stack memory 5. If the stored flag 7 is set, the current attribute information memory 8 is updated by procedure 24 without writing to the stack memory 5. If the stored flag 7 is cleared in procedure 21, the stored flag 7 is set in procedure 22, and the displayed attribute information is transferred from the current attribute information memory 9 to the stack memory 5 in procedure 23. After writing to the attribute storage area 8 in the attribute information memory 9, the current attribute information memory 9 is updated by procedure 24. After procedure 24, return to procedure 12 5
Move on to execution of the next display command statement.

If it is determined in procedure 17 that the display command statement is a call to another display command group, in procedure 18,
After calling and executing the display command group and finishing, return to procedure 12 and move on to execution of the next display command□ command statement.

If it is determined in procedure 13 that the display command statement is the last of the display command group, the stored flag 7 is checked in procedure 14, and the stored flag 7 is checked in the attribute storage area 8 corresponding to the set stored flag 7. According to the display attribute information of
The current attribute information memory 9 in the display execution unit 2 is changed to restore the current attribute information memory 9 to the state immediately before the called display command group was called. Then, in procedure 15, stack pointer 6 is returned to the value before the call, and procedure 1
Return to step 2 and proceed to execution of the next display command statement.

As an example, FIG. 3 shows three display command groups A31°B32.
It shows the calling relationship of C33. Display command group A31
includes a call instruction 35 of the display instruction group B32.

The display command group B32 also includes a display attribute command a372, a call command 382 of the display command group C33, and display display attribute information 9.

Furthermore, the display command group C33 includes a display attribute command c40.

In FIG. 3, calling command 35 of display command group B32
When executing, the stack memory 5 is.

The state shown in FIG. 4(a) changes to the state shown in FIG. 4(b). In other words, in Figure 4 (,).

The stack pointer 6 previously pointed to address 0 in the stack memory 5, but in FIG. 4(b) it points to address 100. That is, in this example, an area for 100 addresses is secured for the stored flag 7 and the attribute storage area 8. Furthermore, when the first display command of the display command group B32 is executed, all the stored flags 71 in FIG. 4(b) are cleared and nothing is written in the attribute storage area 81. However, when executing the display attribute command a37, the part of the stored flag 71 corresponding to the display attribute command a is set, and the current attribute information memory 9 is rewritten.
After the content of is written to the corresponding location of the attribute storage area 81, the attribute information memory 9 is updated. Further, when the call command 38 of the display command group C33 is executed, the stack memory 5 is in a state as shown in FIG. 4(c). In other words, the stack pointer 6 is 20 in the stack memory 5.
Pointing to address 0, stored flag 71 and attribute storage area 81
Above this, an area for 100 addresses is further secured, and a new stored flag 72 and attribute storage area 82 are formed.

When executing the display attribute command c40 in the display command group C33, the corresponding part of the stored flag 72 is set, and the display attribute information to be updated in the current attribute information memory 9 is written into the attribute storage area 82. become. At the end of execution of the display command group C33, the stored flag 72 is checked, and after the display attribute information corresponding to the set part is restored from the attribute storage area 82 to the current attribute information memory 9,
The stack memory 5 is returned to the state shown in FIG. 4(b). In the example of FIG. 3, the display attribute command b39 is executed in the display command group B32 after the display command group C33 is executed, but in this case, in the state of FIG. The display attribute information rewritten in b39 will be written to the attribute storage area 81. Display command group B
32, when execution control returns to the display command group A31, all the display attribute information written in the attribute storage area 81 in FIG. The state also returns to the state shown in FIG. 4(a).

〔Effect of the invention〕

According to the present invention, when calling a group of display commands, only the display attribute information that must be saved and restored at a minimum can be saved and restored, so that the effective speed of graphic drawing can be improved.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing an embodiment of the processing procedure of the present invention, FIG. 2 is a configuration diagram of an embodiment of the present invention, FIG. 3 is an explanatory diagram showing an example of the calling relationship of display command groups, FIG. 4 is a state diagram of stack memory and stack pointer in one embodiment of the present invention. 1...Display command storage unit, 2...Display execution unit, 3...
・Output 10 ≠2 Eel 3 Mouth Figure 4

Claims (1)

[Claims] 1. A display command storage unit that stores display command statements for displaying graphics, a display execution unit that refers to the display command statements in the display command storage unit, and executes graphic display; and execution of the display execution unit. In a graphics drawing device that includes an output display section that outputs and displays results, and an attribute information storage section that temporarily stores display attribute information that is part of the execution result of the display execution section, from one or more display command statements. When calling and executing another display command group while a display command group consisting of When a display instruction group changes the display attribute information at the time of calling the calling display instruction group, the display attribute information to be changed is stored in an area secured in the attribute information storage section, and the display instruction group that is called is stored. When execution ends and execution control is returned to the calling display instruction group, the display attribute information is retrieved from the attribute information storage section and the state of the display execution section is changed to another display instruction group. A graphic drawing device characterized by adopting a method of restoring the state to the state immediately before calling a group of display commands.