JPS61240380A - Graphic display device - Google Patents

Abstract

PURPOSE:To enable easy recognition by eliminating deviation in the relative phase relations of each graphic by converting the coordinate values of reference point in overall scale conversion and the conversion of distance from the reference point in individual scale conversion of the essential data of symbol. CONSTITUTION:As graphic information registered in the segment buffer 51, line segment information defined by segment buffer coordinate space as point l1 (XS.YS) and l2 (XR.YR) and square shaped symbol information defined by the segment line information connecting the intermediate point of the said line, a, b, c, d, respectively enable bit development by superimposing graphics of both information on the frame buffer 6 by the display processor 4. In this case, regarding line segment information the conversion rate of the overall scale alpha is multiplied by the points l1 (XS.YS), l2 (XR.YR) and further by multiplying the individual scale conversion rate 1, scale conversion is carried out and is drawn as line segment between L1, L2 at magnification alphaX1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention: Field of the Invention The present invention relates to a graphic display device using a graphic CRT display f7&, and more particularly to a graphic enlargement/reduction drawing processing method.

B0 Summary of the Invention The present invention relates to a graphic display device that overlays and draws substantial graphics corresponding to graphic information in a segment buffer individually at different scales.

The coordinate values of each line segment information for drawing a symbol among the graphic information are set at the center of the symbol definition space as the reference point, and the actual data of the symbol is converted to the overall scale by converting the coordinate values of the reference point, and then by 6 individual scale conversion. is 1V when converted as a distance from the reference point.

In overlapping drawing of figures in which a symbol is drawn on a line segment, the relative positional relationship between each figure must be determined.

C1 Conventional technology Graphic OR display devices have traditionally been CAD, C
! It is mainly used in the fields of AM, CAE, etc. for graphic creation and off-line work, but recently its use as a terminal device for online systems has been increasing. The graphic CRT display device used as the terminal device of this online system is required to have the following two points in terms of functionality and performance compared to the previous ones.

111 High-speed display: Good responsiveness is an essential condition for an online system, and the process from display request to display completion must be performed quickly, and various display updates must also be performed at high speed.

(2) Wide area support...Some online systems are installed over a wide area and are operated for t equipment. Be able to display the necessary range as required.

It has a so-called computer mapping function.

As a graphic display system, it is called an intelligent terminal type.
A system configuration has been adopted.

In this system, as shown in the second figure, a graphic CRT display device RTL with a computer is used as a terminal side, and a host computer system 2 is connected to this terminal side via a communication line, and a host combiator system 2 is connected to the terminal side via a communication line. An online system is constructed by connecting to other terminals or a host computer. In this configuration, a distributed processing method is used in which the host combinator system 2 performs a large amount of arithmetic processing or data processing, and the computer in the terminal-side graphic CRT display device performs display processing. The load on the host computer system 2 is also reduced while improving performance. The graphic display process in the configuration shown in FIG. 2 will be described in detail below.

The graphic CRT display device l has a CRT monitor 3 that performs f-refresh drawing in a raster scan display method, has a display processor 4 as a control center, and has an e!
Figure information to be displayed (line segment).

Information such as symbols, characters, etc.) T-segment back 75m
Store it in . As shown in the logical relationship shown in FIG. 3, the graphic information stored in the segment buffer 51 is divided into the individual graphic elements (data type 1 display position 1 display color that specifies the display graphic, etc.) located at the lowest level 8D and , these graphic elements 8D
Attributes (visible attributes,
It is configured in a tree structure based on attribute elements SP that define detected attributes 4).

From the graphic information stored in the segment buffer 5m, a range (rectangular area defined by the coordinate values) required for one display is cut out. This cutting process involves a matrix calculation processing section 5 that performs parallel translation and rotational transformation of the displayed figure. .

A clipping processing unit 58 and the like is prepared to remove the portion that protrudes from the displayable 41-screen frame of the CRT monitor 3, and furthermore, the line segment of the cutting source figure information is cut out from the display position it (coordinate position a) to the 7 frame cross corresponding to the position n. A digital differential analysis (DDA) processing unit 54 is provided which develops on/off information of the bits on the 7A6.

The frame buffer 6 is physically a memory having bits t corresponding to each pixel on the screen of the CRT monitor 3 on a one-to-one basis, and has a plurality of bit planes in the display mode, and has a lookup table 7t. -1 Further determine the display color.

This r'L will be explained with reference to FIG. In the figure, the frame buffer 6 has three bit planes φ1. Φ2. +3
Indicates the case with .

Segment buffer 5. The on/off state of the bits corresponding to the graphic information is developed as a combination of pit blocks V-741 to +3. The display on the screen of the CRT monitor 3 is performed by raster scanning the frame buffer 6, and using the combination poor value of bits on of each pit plane 1 to ÷3 as an address, the display is determined by the root/7 table 7. Nine R (red), G (green), and B (blue) beam outputs are given to the t-cRT monitor 3 according to the color table. The table below shows the strong display color difference for each beam in the lookup table 7 for each bit plane ≠ 1 to ÷ 3 bit combinations in the frame buffer 6! ! &) and give an example, 3
8 bit planes φl to φ3 for each pixel.
Specify the color of category 1.

Lookup table 70 3 for each beam of R, G, B
By hitting the bit, 512 (2') colors can be selected.

Returning to FIG. 2, the host combinator system 2 includes a host computer 8t as a control center.

As one processing function of online processing, graphic information is processed and data is divided into appropriate formats and stored in an auxiliary storage device 9 such as a magnetic disk, and graphics within the range required by the graphic CRT display device 1 are stored. Interface information 10.11. The data is transmitted to the graphic CRT display device 1 through the transmission line 12, and received by the graphic CRT display device 1 and sent to the segment buffer 51.
Store it in .

D1 Problem to be solved by the invention W42 In the configuration of the diagram, the size data of the graphic information registered in the segment no.
C! There are many display requests on the RT monitor 3 to enlarge or reduce the cut out original graphic information and draw it.

To enlarge or reduce this figure display, set window (display area) 1 with segment node (111i! Expand to A6 and uniformly enlarge or reduce all symbols, line segments, single characters, etc.

In such general scale display processing, figures with high and low importance are scaled to the same scale, making the displayed figures difficult to see and hindering the operator's accurate figure recognition.
l? It becomes undesirable in terms of obtaining.

To eliminate this problem, 1. Enlarge the shapes with high importance!
The process of increasing t'' The method of displaying 0 is confusing.This process involves setting the size data to be displayed for each figure information, and setting the size table to be displayed when bit expansion of this figure information on the 7-frame buffer 6. This is achieved by fully adjusting the display size magnification for each figure by referring to t-.

In this way, if the scale of each figure can be changed independently of the window (display area) scale in a single figure display, when displaying a symbol on a line segment, the scale of the line segment and the scale of the symbol can be changed. Make a difference! f41! There is a problem that the positional relationship between the minutes and symbols is incorrect. When the display processor performs symbol drawing processing, the bottom left reference point of the symbol definition space is multiplied by the overall scale conversion rate (scale rate), and the actual data of the symbol is To achieve this, multiplying the distance from the reference point by the individual scale conversion factor will make the symbol reference point position correct.

This is due to the fact that the difference between each coordinate representing the symbol entity and the overall scale coordinate occurs.

Means and operation for solving the E1 point
To draw a symbol, each line segment information locus l
! The value is set as the distance from the reference point with the center of the definition space of the sindal as the reference point, and the actual data of the sindal is the overall scale conversion rate multiplied by the coordinate value of the reference point and the distance between the reference point and each line segment information. We will perform a drawing process to calculate the value using the individual scale conversion rate to be multiplied, and for the overall scale conversion, we will only calculate the coordinates of the reference point (t-f*L), and for the individual scale conversion, we will calculate the FT transform the coordinate value of the minute information.

Embodiment 1 The first example shows the correspondence between the segment buffer coordinate space and the display image of the CRT monitor in the processing method of the present invention.

As graphic information registered in the segment buffer 51, a point 111 (x, , Y
5) and I! 2 (XR, YR) Line segment information to be defined and point 6 + b + c + d rI in the middle of the line segment
A graphic all display processor 4 of image information has rectangular symbol information defined by line segment information connecting each IU.
is superimposed on 7V-5 Bats 76 and bit expanded, the overall scale conversion rate α, the individual scale conversion rate of the actual data of line segment information 1. A case will be described below in which drawing is performed using the individual scale conversion rate β of the entity data of the symbol. That is, a case will be explained in which only the overall scale conversion rate is applied to the line segment information.

First, for line segment information, multiply the points 11 (XB, Y5), 12CXR, YR) by the overall scale conversion rate α.

Furthermore, each scale conversion is eliminated by multiplying the individual scale conversion rate lt to the power, and the line segment between the points L1 and 52 is drawn at an enlargement rate αx1.

Regarding symbol information, entity data a-b is defined as line segment information connecting points a * b * c @ d f with respect to the symbol definition space having widths Xq and Yq shown in Fig. 5 (1). *b-(: I C-a
* Coordinate point a of a-a.

1) Let e O# a be the center point p of the symbol definition space (
X□5Yo) Defined as t-reference point. That is, one point a~ has the following coordinates.

However, in the example of the symbol shown in FIG. 5 (to), x and y are negative 1.

To convert the overall scale of symbol information with these nine entity data coordinates, multiply the definition space reference point p (xo - YO) by the overall scale conversion rate α to obtain p (X () * Y () ) → P (αXOIαY
0) Song: Find the drawing reference point P from (3). At this time, the drawing reference point P is in a proportional relationship with the position of the point L ter-2 of the line segment information.

Next, the symbol information is individually scaled.

Nine drawing reference points P (αx0
．． Symbol entity coordinate point a s I based on αY0)
) s e * (i is the individual scale conversion rate β seventh power ratio value as the distance from the drawing reference point P, and drawing coordinate data A,
B, C, Dt- Find. This data A m B eC,
D becomes the next L.

In this way, the drawing reference point P for symbol individual scale conversion is set as the center of the symbol definition space, and for symbol entity data A to D, the reference point P (D) is multiplied by the symbol individual scale conversion rate β. For the reference point P of the symbol (the center of the symbol definition space), multiply by only the overall scale conversion rate α.Drawing by the body A to D is a line segment. The position difference n will not occur.

Regarding this point, conventional individual scale conversion and drawing processing will be explained. Regarding symbol definition, the symbol definition space is limited to the first quadrant as shown in Figure 5 (Bl), and the lower left (
Determination of substance data a to d using 0 points) as the reference point 111! Alternatively, as shown in FIG. 5(,A), a definition using the center point pt minus the reference point is performed. However, in conventional symbol drawing processing, the gravel defined in Figure 5(a) is also converted to L with the lower left of the symbol definition space as the reference point, and the same process as the IBI definition in Figure 5 is performed. conduct,,! In other words, the conventional symbol definition as shown in FIG. 5 (to) is unrelated to drawing processing.

Simply the symbol 4! It is only a function that makes it easier to input all the coordinates for the 7th operation (if the figure is symmetrical from the center position, the value can be reduced just by reversing the sign). for such symbols. The overall scale conversion is performed at point L1. L
Regarding the line segment and reference point determined in step 2, the same scale conversion is performed as in the above embodiment.

However, in symbol individual scale conversion, when multiplied by the conversion rate β, the actual data A to D become the coordinate values shown in (4) above, but the distance from the point (o, o) is X 1 @X! I
Y1aY! Since is multiplied by 1, the position n with respect to the line segment representation is
occurs.

This explanation will be made using FIG. 6.

FIG. 6 IAI is an explanatory diagram of the present proposal, and FIG. 6 fBl is an explanatory diagram of the conventional method.

In the figure, Ll, L2. P is multiplied by the overall scale f conversion rate α and indicates the place t after the friend.

Ma7'j (X q'#Yq' ) * (Xq2
− Yq2)−+ (XQ' * Yq') The rectangle shown in the figure indicates that the area occupied by the Eli symbol definition space in the whole changes depending on the individual scale conversion rate of the symbol, and each individual scale conversion rate is β8. β,. β,
shall be.

In FIG. 6 (sub), the center of the symbol definition space is multiplied by the overall scale conversion rate, so regardless of the value of the individual scale conversion rate β, no positional misalignment n with the line segment occurs.

This concept is illustrated by drawing circles within the three symbol definition spaces in the figure. The centers of all circles are on the line segment Ll-L2.

Next, in FIG. 6 (Bl), the lower left point P of the symbol definition space is multiplied by the overall scale conversion rate, and the symbol display area is determined by the individual scale conversion rate β with that point as a reference.

In the example shown in the figure, circle 1 with conversion rate β has the center on line segment LX-L2
As shown above, the conversion rate β1. In the circle 2° circle 3 due to β, the center is 11 from above the line segment Ll-L2! f'L.

A positional shift n between the symbol and the line segment is generated.

Note that in the embodiment, it is clear that the individual scale conversion rates of the symbols are changed to the vertical and horizontal conversion rates individually so that the position error n does not occur.

Effect of G0 invention As mentioned above, if one invention has one liter, the symbol scale f
The center of the symbol definition space is used as the reference point for the replacement drawing process, and t%
Coordinate values of line segment information (titlj) are calculated by multiplying the distance from the reference point by the individual scale conversion rate, and only the coordinate values of the reference point are converted for the overall scale conversion, so if the scale conversion rate differs on each side of the figure, Also, the relative positional relationship of each figure is
The L is eliminated and the T is displayed, which has the effect of making solid recognition easier.

[Brief explanation of drawings]

The first reason is the ninth segment buffer area and CRT monitor display area correspondence diagram, ig2, which explains the processing method of the present invention.
The figure is a configuration diagram of a graphic display device, and the third section is a segment structure diagram of graphic information handled in FIG. FIG. 4 is a diagram for explaining the bit expansion and color display processing of graphic information in a graphic CRT display device;
5 (4) and FIG. 5 (Bl is an explanatory diagram of the coordinate 1 axis in the symbol definition space, and FIGS. 6 1 and 6 (Bl is an explanatory diagram of the conventional position 1 for the present invention. 1゛°°°°Graphic CRT device, 2... host computer system, 3... CRT monitor, 4...
Disb V processor, 5. ... segment buffer, 5. ... Matrix calculation processing section, 5. ... Clipping processing unit, 54... DDA processing unit, 6... Frame buffer, 7... Lookup table, 8.
...Host computer, 9...Auxiliary storage device. j Shi Nno Gense Chitoshi Flit Town - 1st item Fig. 6 (A) A dazzling and O 搗 large tank 1st place

Claims (1)

[Claims] The graphic information registered in the segment buffer is expanded into bits in the frame buffer and displayed on the CRT monitor, and the display processor converts multiple pieces of graphic information in the graphic display area set within the coordinate space of the segment buffer into an overall scale conversion rate. In a graphic display device that scales and displays each of the extracted graphic information according to the individual scale conversion rate, the coordinate values of each line segment information for drawing a symbol are based on the center of the definition space of the symbol. A point is set as a distance from the reference point, and the actual data of the symbol is calculated using the overall scale conversion rate multiplied by the reference point coordinate value and the individual scale conversion rate multiplied by the distance between the reference point and each line segment information. A graphical display device characterized by determining a value.