JP3262319B2 - Drawing display method and drawing processing system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a drawing processing system for managing a drawing composed of vectorized graphic data, such as a CAD device, and a method for redisplaying updated graphic data.

[0002]

2. Description of the Related Art In a conventional drawing processing system, a drawing including a line drawing such as a map of a road and the like, graphic data such as a shape of a house, and characters are shown in FIG.
As shown by the layer c, it is managed on a layer basis.
For example, when processing a drawing for managing sewerage facilities for each region, graphic data such as the shape of a house is displayed on a layer a, a line drawing such as a road map is displayed on a layer b, and a line drawing such as a road map is displayed on a layer c. Graphic data such as a water pipe is displayed.

In a system for handling such drawings, when a house is newly installed or a sewer pipe is added or removed, necessary graphic data is newly added or deleted at a corresponding place. In order to confirm whether or not the drawing has been correctly updated, a process of redisplaying the drawing of each layer based on the updated data is performed.

[0004] In this case, there are two methods of redisplaying: (1) a method of redisplaying not only the updated layer but all the layers, and (2) a method of redisplaying only the updated layer.

[0005] That is, in FIG.
Assuming that only one has been updated, the method of (1)
As shown in FIG. 9A, all layers are displayed again,
The method (2) is a method of redisplaying only the layer a as shown in FIG. 9B.

[0006]

Generally, graphic data on a drawing is mostly updated, for example, when the drawing is map data, about a house frame, a resident name, and the like. Although most other graphic data are rarely updated, according to the redisplay method of FIG. 9A, all graphic data that has not been updated is drawn again and displayed. Therefore, for example, even if 10,000 pieces of graphic data are displayed on the screen, and only one of the pieces of graphic data is updated and redisplayed, all of the 10,000 pieces of graphic data are drawn. Will be displayed again. For this reason, the entire display area is redrawn, and there is a problem that the drawing process takes a very long time.

On the other hand, when only the layer in which the graphic data updated by the redisplay method shown in FIG. 9B is redisplayed, the drawing processing is generally always overwritten in the drawing processing system. There is no problem if the layer where the updated graphic data exists is the top layer, but if it is not the top layer, that layer is displayed as the top layer, and the display order of the layers is switched. Problem. For example, if the drawing is a map, the graphic data of the resident name is displayed on the graphic data of the filled house frame, and if the shape of the graphic data of the house frame is corrected, the graphic data of the house frame exists. When only the layer to be displayed is redisplayed, there is a problem that the graphic data of the filled house frame is drawn on the graphic data of the resident name, and the resident name becomes invisible and cannot be confirmed.

An object of the present invention is to provide a drawing processing method and a drawing processing system which can redisplay a graphic data in a short time without changing the display order of layers when redisplaying graphic data. Is to do.

[0009]

In order to achieve the above object, the present invention manages each graphic data in a drawing by using a rectangular area surrounding the graphic data, and when the graphic data is updated, By making the rectangular area surrounding the updated graphic data the target of redrawing, and taking the logical sum with the rectangular area of other updated graphic data, and selecting the range of the logical sum as the redrawing area, The redrawing area is localized to reduce the time required for redrawing. When a drawing is composed of a plurality of layers, the above-described local redrawing process is performed for each layer. is there.

More specifically, in the drawing display method in the graphic processing system of the present invention, each graphic data is stored as a set of coordinate values of a rectangular area surrounding each graphic data and update identification information indicating whether graphic data is updated or not. In response to an instruction to redisplay the drawing after updating the graphic data, whether or not the graphic data has been updated is determined based on the update identification information of each graphic data. ORing with the rectangular area surrounding the other graphic data determined as above, performing redrawing processing only on the graphic data included in the rectangular area calculated by the logical sum, and redisplaying it on the display screen It is characterized by.

The graphic processing system of the present invention further comprises a storage means for storing each graphic data as a set of coordinate values of a rectangular area surrounding each graphic data and update identification information indicating whether graphic data is updated or not, In response to the drawing redisplay instruction after the graphic data update process, the update identification information of each graphic data is used to determine whether or not the graphic data has been updated. Redrawing processing means for calculating a logical sum with a rectangular area surrounding the data, performing a redrawing process only on the graphic data included in the rectangular area calculated by the logical sum, and redisplaying the graphic data on the display screen It is characterized by.

[0012]

Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a drawing processing system to which the present invention is applied.

The drawing processing system according to the present embodiment includes an external storage device 10 for storing graphic data, a memory 20 for storing various information, and a display device for holding a current display state and performing display processing. Graphic display 3
0, a keyboard 40 and a mouse (pointing device) 50 for selecting menus on the screen and performing various operations, and a processing device (CPU) 60 for executing various processes such as display processes. You.

The memory 20 stores a redisplay program 21 for performing the main processing of the present invention. The memory 20 stores the coordinate values of the rectangular area of each graphic data to be redrawn calculated by the redisplay program 21. Display graphic coordinate storage area 2
2 are provided.

FIG. 2 shows a schematic configuration of data stored in the external storage device 10.
Layer information 11 including a layer number and a layer name,
Vector representation graphic data 1 consisting of lines, planes, characters, etc.
2. A graphic data attribute 13 including information such as an area where the graphic data 12 is present and whether or not the graphic data 12 is updated is stored.

The graphic data 12 is managed together with the graphic data attribute 13, and in the case of a map, roads constituting the map,
It consists of definition records such as railway, house frame, river, address, lot number, building name, target name, facility symbol, etc., classified into graphic data types, and stored in line, plane, character, symbol, and other record formats. I have.

FIG. 3 is a diagram showing the configuration of the graphic data attribute 13.

The graphic data attribute 13 includes a record length 31,
The layer number, layer color, line type,
Graphic information 33 indicating a layer attribute 32 as display / non-display information, a coordinate value of a line segment, a reference point of a character, a character code, and the like;
It comprises a rectangular area existence area 34 represented by the coordinates of the diagonal of the rectangle in which the graphic data exists, and update presence / absence information 35 indicating whether or not the graphic data has been updated after the previous redisplay. The coordinate value of the existence area 34 includes a lower left x coordinate, a lower left y coordinate, an upper right x coordinate, and an upper right y coordinate of the rectangle in which the graphic data exists.
Is composed of flags with update = 1 and no update = 0.

Next, the redisplay processing in this embodiment will be described in detail with reference to FIGS.

FIG. 4 is a flowchart showing the flow of processing of the redisplay program 21, and FIGS. 5 (a), 5 (b) and 5 (c).
Is a diagram showing an image of a redisplay process to which the present invention is applied,
FIG. 6 shows the mass 51 and the service line 5 of the sewage facility layer in FIG.
2 shows an example of a graphic data attribute 13 of graphic data No. 2.

In FIG. 5A, the display of the drawing of the sewage facility is allocated to the uppermost layer L1, the display of the drawing of the house frame is allocated to the middle layer L2 thereunder, and the display of the house frame is allocated to the lowermost layer L3. Is assigned to display road drawings. When FIG. 5A is set to an initial state, it is assumed that a cell 51 and a drop-in line 52 constituting a sewage facility have been added to the illustrated position in the uppermost layer L1 as shown in FIG. 5B.

The rectangular existence region 34 and the update presence / absence information 35 surrounding the added cell 51 and drop-in line 52 are shown in FIG.
(C) and (d).

After the cell 51 and the drop-in line 52 are added to the uppermost layer L1, if an instruction for redisplay is given by the operator, the redisplay program 21 stores the coordinate values of the rectangular area of the graphic data to be redisplayed. The redisplay graphic coordinate storage area 22 is initialized (step 41).

Here, the range of the area to be redisplayed is shown in FIG.
In FIG. 7A, the entire display screen of the display 30 can be selected as indicated by a symbol 71, or as shown in FIG. 7B, only the right half of the display screen can be selected.
Similarly, a left half, an upper half, a lower half, and the like can be selected. Redrawing after updating the graphic data is performed within the range of the redisplay area selected by the operator.

After the initialization of the redisplay graphic coordinate storage area 22, the redisplay program 21 obtains the update presence / absence information 35 of the graphic data attribute 13 of each graphic data existing in the redisplay area 71 (step S1). 42), it is determined whether or not the graphic data has been updated (step 43).

Up to the graphic data attribute 13 of the cell 51, since the update presence / absence information 35 is "absent", the process returns to the step 42 via the step 46. Next, when referring to the update presence / absence information 35 of the graphic data of the cell 51, the update presence / absence information 35 of the graphic data of the cell 51 is “present”. It is determined whether or not the xy coordinates of the record existence area 34 are included in the redisplay area 71 (step 44).

Here, since all are included as shown in FIG. 8, next, the logical sum of the existence area 34 and the rectangular area of the other updated graphic data included in the redisplay area 71 is calculated and calculated. The stored area is stored in the redisplay graphic coordinate storage area 22 (step 45). From step 44 to step 45, the record of the cell 51 is the first record with update, and there is no data in the redisplay graphic coordinate storage area 22 yet.
Is stored in the redisplay graphic coordinate storage area 22.

Next, the next graphic data is searched to determine whether graphic data remains (step 46). Since there is graphic data of the drop line 52 as the remaining graphic data, the process returns to step 42 to obtain the update presence / absence information 35 of the graphic data of the drop line 52 (step 42). Since the update presence / absence information 35 of the graphic data of the drop line 52 is “present” (step 43), the drop line 52
It is determined whether or not the presence area 34 is included in the redisplay area 71 (step 44). Here, since all are included as shown in FIG.
Area 34 of the cell 51 stored in the
Is ORed with the existence area 34 of the image, and the result is stored in the redisplay graphic coordinate storage area 22 (step 45).

Here, the rectangular area represented by the logical sum of the existence area 34 of the cell 51 and the existence area 34 of the drop line 52 is as shown by a symbol 81 in FIG. In this case, an area in which the rectangular areas of the two figures do not overlap is isolated as indicated by a symbol 82 in FIG. In any case, if the updated graphic data exists in the redisplay area 71, a rectangular area surrounding the updated graphic data is extracted into the redisplay graphic coordinate storage area 22.

Next, the graphic data is searched again to determine whether there is any other graphic data (step 46). Service line 5
Since the data of the updated figure is the last in the figure data of 2,
Next, as shown in (c) of FIG. 5, only the rectangular area indicated by the coordinate values stored in the redisplay graphic coordinate storage area 22 calculated in step 455 is targeted in order from the road layer which is the lowest layer L3. And redraw (step 47).

In FIG. 5C, the portion to be redrawn is indicated by a broken line.

According to the above-described processing, when some graphic data is updated on a drawing having a large number of graphic data, only a rectangular area including the updated graphic data is determined as a redisplay target, and The graphic data in that area is redrawn. Therefore, the redraw target is localized, and redisplay for confirming update data can be performed in a short time. Further, since only the updated layers are re-displayed in the order of layers instead of being re-displayed, it is possible to prevent adverse effects such as the invisible resident name in the figure of the house frame as in the related art.

In the above embodiment, all three layers are redisplayed. However, if the updated graphic is only the uppermost layer L1, the lower layers L2 and L3 are not redisplayed. Good. In this case, the processing time for redisplay can be further reduced.

When the graphic data is updated, only the updated graphic data is stored in another storage area of the memory 20, and the stored graphic data is sequentially acquired and displayed again. You may. In this case, since there is no time to refer to the graphic data that has not been updated, the redisplay time can be further reduced.

[0036]

As is apparent from the above description,
According to the present invention, when the drawing is redisplayed, the updated data is searched from the graphic data on the drawing, and only the area calculated by the logical sum of all the existing areas of the updated graphic data is searched. By using the redisplay area, the range to be redisplayed can be localized, the processing time for redisplay can be greatly reduced, and efficient redisplay processing of drawing data can be performed. Also, since the display order of the layers is not changed, there is an effect that the update of the graphic data can be accurately reflected on the drawing without the layers being switched.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a graphic processing system to which the present invention is applied.

FIG. 2 is a configuration diagram of vector data in an external storage device.

FIG. 3 is a configuration diagram of a graphic data attribute record.

FIG. 4 is a flowchart showing a flow of a redisplay process.

FIG. 5 is a diagram illustrating an image of a redisplay process.

FIG. 6 is a diagram showing a specific example of a graphic data attribute.

FIG. 7 is a diagram illustrating an example of a redisplay area.

FIG. 8 is an explanatory diagram of a rectangular area to be displayed again.

FIG. 9 is an explanatory diagram of a conventional redisplay method.

[Explanation of symbols]

Reference Signs List 10: external storage device, 13: graphic data attribute, 34: existing area, 35: update presence / absence information, 20: memory, 21: redisplay program, 22: redisplay graphic coordinate storage area, 30
... Graphic display, 50 ... Mouse, 50 ... Processing device (CPU).

Continuation of the front page (56) References JP-A-3-147076 (JP, A) JP-A 8-249481 (JP, A) JP-A-3-244084 (JP, A) (58) Fields investigated (Int) .Cl. ⁷ , DB name) G06T 11/60-11/80 G06F 17/50 G09G 5/36 G06F 3/14-3/153

Claims (3)

(57) [Claims] 1. A drawing display method in a drawing processing system for displaying a drawing including a plurality of graphic data on a display screen, wherein each graphic data is represented by a coordinate value of a rectangular area surrounding each graphic data and a graphic data update. A set of update identification information indicating presence / absence is stored in the storage device, and in response to a drawing redisplay instruction after the graphic data update processing, the presence / absence of update of the graphic data is determined by the update identification information of each graphic data. Is determined, and if there is an update, the logical sum of the rectangular area surrounding the other graphic data determined to be updated is calculated, and only the graphic data included in the rectangular area calculated by the logical sum is re-targeted. A drawing display method, comprising: performing a drawing process and redisplaying the drawing on a display screen. 2. The drawing display method according to claim 1, wherein the redrawing process is performed for each display layer based on attribute information of the display layer added to the graphic data. 3. A drawing processing system for displaying a drawing including a plurality of graphic data on a display screen, wherein each of the graphic data is updated identification information indicating coordinate values of a rectangular area surrounding each of the graphic data and whether or not graphic data is updated. And a storage means for storing the figure data as a set. In response to an instruction to redisplay the drawing after updating the figure data, the update identification information of each figure data determines whether or not the figure data has been updated. Performs a logical OR with the rectangular area surrounding the other graphic data determined to be updated, performs redrawing processing only on the graphic data included in the rectangular area calculated by the logical sum, and displays the result on the display screen. A drawing processing system, comprising: a redrawing processing unit for performing a redisplay.