JP2638501B2 - Graphic data display device and graphic data display method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphic data display device for displaying a graphic based on input vector data and a display method thereof, and more particularly to a graphic data display device for enlarging and reducing an image on a display device. Regarding the display method.

[0002]

2. Description of the Related Art In a system for storing vector data of a graphic such as a map or a circuit drawing in a large-capacity storage medium such as a magnetic disk and managing the graphic data and outputting graphic data based on the vector data as required, A graphic data display device for generating an image (graphic data) based on the image data and displaying the image on a display device is indispensable.

Conventionally, this type of graphic data display device has a display device 50 for displaying an image as shown in FIG.
And a vector data display control unit 60 for inputting vector source data and displaying an image on the display device based on the input data. Therefore, the input vector source data is not processed, and an image generated by displaying all the individual vector data as targets of the display processing is represented as a display graphic.

The displayed image is enlarged or reduced as appropriate according to the display screen of the display device 50 and displayed. In some cases, graphic data displayed on the display device 50 is enlarged or reduced due to the necessity of operation or processing. Conventionally, even in such a case, an image is generated and displayed with all vector data as targets of display processing.

[0005]

However, in the above-described conventional graphic data display apparatus, even if a request for enlarging or reducing the graphic display is made, all the vector data are always subjected to the display processing regardless of the size of the display graphic. Therefore, a certain time is always required to display the graphic. For this reason, especially in the case of reducing the size of the graphic display, all adjacent data that may be duplicated in the display is processed as a display target, and this process consumes unnecessary time. was there.

An object of the present invention is to provide a graphic data display device and a display method thereof which solve the above-mentioned conventional drawbacks, omit redundant vector data when displayed on a display device, and efficiently display images. Aim.

[0007]

In order to achieve the above object, a graphic data display device according to the present invention has a feature that when a vector source data is inputted, analyzed and displayed on a display device, the data is duplicated. Vector data analysis means for distinguishing between vector data for detecting and displaying vector data and vector data for which display is omitted, and displaying an image based on the vector data on a display device according to the analysis result of the overlap vector data analysis means. Vector data display control means.

In another aspect, the overlapping vector data analyzing means corrects the coordinates of the vector data in accordance with the display magnification of an image displayed on a display device based on the vector data; Focusing on the integer part, means for detecting vector data having the same integer part value, and selecting one of the vector data having the same integer part value as the vector data to be displayed. Means for distinguishing other vector data as vector data for which display is omitted.

In another aspect, the duplicate vector data analysis means selects the vector data having the smallest coordinate value among the vector data having the same integer part value as the vector data to be displayed. Is distinguished as vector data whose display is omitted.

A method of displaying graphic data according to the present invention that achieves the above object detects and displays vector data that is redundantly displayed when vector source data is input and analyzed and displayed on a display device. The system includes a step of distinguishing between vector data and vector data for which display is omitted, and a step of displaying an image based on the vector data on a display device in accordance with the analysis result of the overlapping vector data analysis means.

Another method of displaying graphic data that achieves the above object is a method of correcting coordinates of vector data according to a display magnification of an image displayed on a display device based on the vector data; Detecting the vector data having the same value of the integer part by focusing on the integer part of, selecting one of the vector data having the same value of the integer part of the coordinates as the vector data to be displayed And a step of distinguishing other vector data as vector data for which display is omitted, and a step of displaying an image based on the vector data on a display device in accordance with the analysis result of the overlapping vector data analysis means.

[0012]

According to the present invention, vector data that will be duplicated when an image based on vector data is displayed on a display device is detected, and vector data to be displayed and vector data to be omitted are distinguished. Therefore, the image display can be performed by appropriately omitting the vector data according to the display magnification of the image.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a graphic data display device according to one embodiment of the present invention.

As shown in the figure, the graphic data display device of the present embodiment includes a display device 50 for displaying an image, an overlapping vector data analysis unit 20 for inputting and analyzing the vector source data 10, and an image display according to the analysis result. And a vector data display control unit 40 for generating and displaying the same on the display device 50.

The vector source data 10 is stored and managed in a large-capacity storage device such as a magnetic disk device (not shown), and is read out and input to the graphic data display device as needed. FIG. 2 shows an example of the vector source data 10. FIG. 3 exemplifies source data in which vector data of each point is represented by XY coordinates. In this embodiment, it is assumed that each value of the XY coordinates corresponds to each dot on the display screen of the display device 50. Further, it is assumed that the X axis and the Y axis on the display screen can be arbitrarily set.

The overlapping vector data analysis unit 20 corrects the coordinates of the vector data of each point of the input vector source data 10 according to the display magnification of the image displayed on the display device 50. That is, the display device 5
When the display screen of 0 is sufficiently large or when it is desired to display a specific portion of the figure in detail, it is necessary to increase the display magnification and display the image enlarged. Conversely, when the display screen of the display device 50 is small or when it is desired to look down on the entire figure, it is necessary to reduce the display magnification and display the image in a reduced size. In such a case, the coordinates of the vector data are corrected as necessary, so that the image can be displayed by being enlarged or reduced to a desired magnification. The display magnification can be specified by various means such as an operator inputting a command from the outside. If the image is not enlarged or reduced, it goes without saying that the coordinates of the vector data are not changed at all.

The duplication vector data analysis unit 20
Focusing on the integer part of the coordinates of the corrected vector data as described above, vector data having the same value of the integer part is detected. The detected vector data is displayed at the same position when displayed on the display device 50. Therefore, one of the detected vector data is selected as the vector data to be displayed, and the other vector data is distinguished as the vector data whose display is omitted. The procedure for selecting the vector data to be displayed on the display device 50 will be described later in detail.

The analysis result obtained as described above is sent to the vector data display control unit 40 as a vector data analysis result 30. Fig. 3 shows the vector data analysis result 3.
An example of 0 is shown. The drawing illustrates the XY coordinates of the vector data of each point and the display or non-display at various display magnifications. In the figure, α1, α2,
.., Αn indicate display magnifications, and at each display magnification, ○ indicates vector data to be displayed, and x indicates vector data for which display is omitted. In practice, display or non-display is not determined in advance for various display magnifications as shown in the figure. The result 30 is created and sent to the vector data display control unit 40.

The vector data display control unit 40 receives the vector data analysis result 30 sent from the overlapping vector data analysis unit 20, and displays an image 51 on the display device 50 in accordance with the result. That is, in the example of the vector data analysis result 30 in FIG.
, (X1, Y1), (X2, Y2), (X
(X4, Y4), (X6, Y6),..., (Xn, Yn) are displayed, and (X3, Y3), (X5, Y5),.
(n-1, Yn-1) is not displayed.

Next, the procedure for determining whether or not to display vector data by the overlapping vector data analysis unit 20 will be described with reference to FIG. FIG. 4A shows a figure based on the vector source data 10 as it is on the display device 50.
FIG. 4B shows a display example when the display magnification is set to 1/2.

First, the overlapping vector data analyzer 20 defines the display magnification as follows. Display magnification α = (difference between maximum and minimum values of X coordinate of vector data to be displayed) 表示 (difference between maximum and minimum values of X coordinate of vector source data) Next, range to be displayed The coordinate value N′n (Xn · α, Y) of the vector data after correction is obtained from the coordinate value Nn (Xn, Yn) of the vector data in the
n · α). Then, ΔN′n (ΔXn · α) in which the decimal part of the calculated coordinate value is truncated to leave only the integer part
n · ΔYn · αn).

By performing the above processing, ΔXn · α = ΔXn + 1 · α and ΔYn · α between a certain vector data Nn (Xn, Yn) and its adjacent vector data Nn + 1 (Xn + 1, Yn + 1) ΔY
The relationship of n + 1 · α may be established. In such a case, the vector data Nn is selected as the vector data to be displayed,
The vector data analysis result 30 is created as vector data that does not display the vector data Nn + 1. Similarly, ΔXn · α = ΔXn + i · α and ΔYn · α = ΔY between three or more vector data Nn + i (i> 0)
Even when the relationship of n + i · α holds, the vector data Nn
Only (i = 0) is selected as the vector data to be displayed, and the other vector data Nn + i is set as the vector data not to be displayed. If there is no plurality of vector data having the same integer part, it is needless to say that all such vector data are displayed.

Referring to FIG. 4, the range of the figure based on the vector source data shown in FIG.
(The unit is arbitrary.) On the other hand, the display target range displayed on the display screen of the display device 50 is set to 50 × 50.
In this case, the display magnification is α = 50 ÷ 100 = １ ／. Three points of continuous vector data N1, N2, and N3 in the vector source data are taken, and the three points corrected by the overlapping vector data analysis unit 30 are denoted by N1 ',
N2 'and N3'. The coordinates of N1, N2, N3 are N1
= (10,10), N2 = (11,11), N3 = (1
2 · 12), the coordinates of N1 ′, N2 ′, and N3 ′ are N1 ′ = (10/2, 10/2) = (5,
5), N2 ′ = (11/2, 11/2) = (5.5,
5.5), N3 ′ = (12/2, 12/2) = (6,
6). Here, the coordinates of N1 'and the coordinates of N2' are compared, and the integer part is 5 and the same. Therefore, since these two points are duplicated when displayed on the display device 50, N1 'is selected as vector data to be displayed, and N2' is not displayed. Thereby, as shown in FIG. 4B, the display screen of the display device 50 displays two vectors of the vector data N1 ′ and N3 ′.
A dot is displayed.

Although the present invention has been described with reference to the preferred embodiments, the present invention is not necessarily limited to the above embodiments. For example, in the present embodiment, in order to detect overlapping vector data when displayed on a display device, the decimal point part of the coordinate value of the vector data is truncated, and the same data is detected by focusing only on the integer part. , The decimal part of the coordinate value may be rounded to detect data that is the same as the coordinate value of only integers.

[0025]

As described above, the present invention detects vector data that is duplicated when an image based on vector data is displayed on a display device, and displays vector data to be displayed and vectors to omit the display. Since the data can be distinguished from the data, the image data can be efficiently displayed by thinning out the vector data as appropriate according to the display magnification of the image.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a graphic data display device according to one embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of vector source data.

FIG. 3 is a diagram illustrating an example of a vector data analysis result.

FIG. 4 is a diagram showing a correspondence between a graphic based on vector source data and a graphic displayed on a display device.

FIG. 5 is a block diagram showing a configuration of a conventional graphic data display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vector source data 20 Duplicate vector data analysis part 30 Vector data analysis result 40 Vector data display control part 50 Display device

Claims (5)

(57) [Claims] 1. A method for detecting and displaying vector data which is displayed redundantly when inputting and analyzing vector source data and displaying the same on a display device, distinguishes between vector data to be displayed and vector data to be omitted. A graphic data display device, comprising: overlap vector data analysis means; and vector data display control means for displaying an image based on vector data on a display device according to an analysis result of the overlap vector data analysis means. 2. The method according to claim 2, wherein said overlapping vector data analyzing means corrects coordinates of the vector data in accordance with a display magnification of an image displayed on the display device based on the vector data, and focuses on an integer part of the corrected coordinates. Means for detecting vector data having the same value of the integer part, and selecting one of the vector data having the same value of the integer part of the coordinates as vector data to be displayed, and selecting other vector data. 2. The graphic data display device according to claim 1, further comprising means for distinguishing as vector data whose display is omitted. 3. The vector data analyzing means selects the vector data having the smallest coordinate value among the vector data having the same integer part value as the vector data to be displayed, and displays other vector data. 3. The graphic data display device according to claim 2, wherein the graphic data is distinguished as vector data in which is omitted. 4. A method of detecting and displaying vector data which is to be redundantly displayed when inputting and analyzing vector source data and displaying the same on a display device, distinguishes between vector data to be displayed and vector data to be omitted. And a step of displaying an image based on vector data on a display device in accordance with an analysis result of the overlapping vector data analysis means. 5. A step of correcting the coordinates of the vector data according to the display magnification of an image displayed on the display device based on the vector data; and focusing on the integer part of the corrected coordinates, the value of the integer part is the same. And selecting one of the vector data having the same integer part value of the coordinates as the vector data to be displayed and discriminating the other vector data as the vector data for which the display is omitted. And displaying an image based on the vector data on a display device in accordance with the analysis result of the overlapping vector data analysis means.