|Publication number||USRE42414 E1|
|Application number||US 08/937,439|
|Publication date||May 31, 2011|
|Filing date||Sep 25, 1997|
|Priority date||Nov 30, 1990|
|Also published as||US5454073|
|Publication number||08937439, 937439, US RE42414 E1, US RE42414E1, US-E1-RE42414, USRE42414 E1, USRE42414E1|
|Inventors||Manabu Fukushima, Mikio Yoda, Kazuo Tsutsui|
|Original Assignee||Hitachi, Ltd.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (21), Non-Patent Citations (1), Classifications (10)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates to a drawing management device for managing the drawings of facilities, such as a pipe laying system of a water and gas supply, a wiring system for electric power and telephone, a road for vehicles, etc., in the form of digitized information. It should be noted that the term ‘drawing’ as used herein refers to a drawing of the facility, such as a water supply, a machine design drawing, a road traffic map, etc.
Traditionally, the state of facilities, such as a pipe system for water and gas supply, and a wiring arrangement for electric power and telephone communication, has been provided in the form of a drawing drafted on a sheet of paper or polyester film. In this case, each change in the facilities requires a modification to be made to the drawing. The work of modifying the drawing must be performed manually with the result that a long time and much labor are required and also the possibility that errors will be made in modifying the drawing is relatively strong. In order to solve such a problem, it has been proposed to manage the facility drawing in the form of its digitized information. More specifically, as disclosed in JP-A-63-254565, the management is performed by displaying the many facility drawings (e.g., topography drawings, system drawings and symbol drawings) stored is digital data in a file device on a display device under computer control. The work for modifying the drawings is also made under computer control for the drawings displayed on the display device.
However, the above prior art has the following defects. In displaying large scale drawing data including e.g. qualifying lines, the processing therefor is executed at a very low speed since the data amount to be drawn or displayed during a unit time is very large. This is because even if only a part of the drawing is required, all the data including minute and detailed character information, which is difficult to recognize, are displayed. Therefore, the above prior art system is poor in its usability and efficiency as a facility display system.
The present invention has been accomplished in order to eliminate the above defect of the prior art, and intends to provide a drawing management device that can surely attain a user (operator)'s objectives, i.e. has a function of displaying the object required by a user swiftly and exactly. This is because, where very detailed drawing information is not necessary, it is important to display only the drawing information within the range required by an operator as soon as possible, but not all of the items of the stored detailed drawing information.
An object of the present invention is to provide a drawing management device that can swiftly display drawing information with a degree of detail desired by an operator.
In order to attain the above object, a certain limit is given to the displaying time and priorities are automatically allotted to display objects located at several levels so that all necessary and a minimum amount of information can be displayed within a limited time.
The priorities of drawing data relative to the facility for water supply are automatically allotted at three to five levels. An operator updates the priority in sequence from history information with a changed display level, thereby to provide a desired drawing swiftly.
The above and other objects and features will be more apparent from the following description taken in conjunction with the accompanying drawings.
Referring now to the drawings, an explanation will be given of one embodiment of the present invention.
The facility drawing may be composed of a plurality of drawings, such as shown in
The graphic data is expressed on rectangular coordinates as shown in
On the other hand, the attribute data is supplied to the file device 203 from a data inputting device, which collectively supplies data from a keyboard 206 or a floppy disk 208.
An operator manipulates a mouse 207 to display the drawing on a display device (CRT) 205 as follows. First, the operator manipulates the mouse 207 to move a cursor CU to one of a plurality of icons for selecting functions displayed on the CRT screen so that the function intended is specified. If the icon for ‘drawing retrieval’ is specified, a central processing unit (CPU) searches the drawing data concerned (composed of graphic data and related attribute data) to be temporarily stored in a main memory 202. The main memory 202 operates to store the programs for executing the processings, such as search and editing of the drawing data, as well as the drawing data being processed. The drawing data temporarily stored in the main memory 202 is edited by the CPU 201 in accordance with the valid display coordinate that is a display region of the CRT 205, and thereafter the edited data is displayed on the CRT 205. The operator can recognize the contents of a desired or objective drawing from the displayed image.
Further, in order to recognize the details of the drawing, the image is displayed so as to be partially enlarged. To this end, the cursor CU is moved using the mouse 207 to specify any square region within the CRT display region in terms of ends of a diagonal line so that a part of the drawing is enlarged or reduced. Actually, a part of the drawing data concerned stored in the main memory 202 is edited in an enlarged or reduced way, and the drawing data thus edited is displayed on the CRT 205.
An explanation will be given of the level display with priorities that permits a desired drawing to be displayed within a predetermined time.
An explanation will be given of the relationship between the function of each of the functional units within the CPU 201, and an operation of manipulation and display.
A desired drawing is retrieved or searched using an index drawing, drawing number, etc. and thereafter is displayed on the display device. The operation of the CPU 201 in such a display processing process will be explained below. First, using the mouse 207, the item ‘drawing retrieval’ is selected or designated on the icon region 102 for mouse manipulation. This selective designation is inputted to a manipulation input section 104 thereby to activate a priority display control section 105. The priority display control section 105 directs a graphic retrieval section 106 to retrieve the desired drawing (data). Further, when the level to be displayed in the graphic data retrieved from the graphic file 203 is changed, the priority display control section 105 serves to automatically change the priority level for the corresponding level on the display priority table previously defined in accordance with the changing history of the level concerned. Specifically, as shown in
The method of defining the display priority table of
where Dmax: the largest amount of data which can be displayed during the time t
t: prescribed display time
D0: the amount of data displayed during a unit time
In step 702, the amount of displayed data corresponding to a priority i is calculated, and in step 703, the request of data display with the priority of i is reported to the priority display processing section 107. Finally, in step 704, the total amount of displayed data up to the priority of i is calculated and the calculated amount of data is compared with the largest amount of data that can be displayed. If the former is within the range of the latter, the processing for the succeeding priority of i+1 is repeated.
In this way, only the graphic data corresponding to the prescribed retrieval time can be automatically selected so that the drawing data with a high priority can be retrieved without being influenced by the complexity of the drawing concerned.
In designating the item ‘drawing retrieval’, in order to previously recognize the data capacity corresponding to the drawing data, a process reflecting the approximate data capacity of the drawing concerned on the icon to be retrieved will be performed as follows.
The mouse 207 is manipulated to move the cursor CU to the icon region 102 so that the icon of the item ‘capacity three-dimensional display’ is selected or designated on the icon region 102. This selective designation is inputted to the manipulation input section 104 of the CPU 201, and thereafter a request for the capacity of the three-dimensional display is reported to an icon three-dimensional display processing section 109. In previously registering drawing data in graphic files of the file device 105, a graphic data amount calculating section 108 calculates the capacity of the graphic data for each level and stores the calculation result on the main memory 202 as shown in
In this way, the approximate data capacity of the drawing can be easily determined from the icon shape prior to the drawing retrieval so that the time taken for the retrieval and data processing can be recognized swiftly and easily.
The present invention can be applied to a so-called navigation device mounted in a car which can quickly display road traffic information on a display device.
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|U.S. Classification||715/807, 345/629, 715/964, 715/976|
|International Classification||G09G5/377, G09G5/42|
|Cooperative Classification||Y10S715/964, Y10S715/976, G09G5/42|