JPS61156290A - Graphic display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a graphic display device (graphic display device).
ay), especially the man-machine interface when inputting graphic data into a computer.
The present invention relates to a graphic display device that constitutes an inter-face.

[Conventional technology]

FIG. 6 is a block diagram showing a conventional graphic display device,
In the figure, (1) is a graphical input device.
A tablet (a type of input device)
(2) is the central processing unit (hereinafter abbreviated as CPU), +31 is the cathode ray tube mounting part *<hereinafter C
(abbreviated as RTC), (4) is a cathode ray tube display device (hereinafter abbreviated as CRT), (11) is a tablet pen (5
tylus).

The tablet (1) is provided with x-y rectangular coordinates, and position data regarding said x-y rectangular coordinates of the point where the tablet pen (11) contacts the surface of the tablet (1) is output. If this position data is (XO* yo
), and X0I)'O are signal lines (a), respectively.

(b) Input to the CPU (21).

On the other hand, the CRT (4) has X-7 orthogonal coordinates determined by its horizontal and vertical scans, and the tablet (1)
The point (XO# 16) above is displayed as the point xl e )'1'') with respect to the rectangular coordinates on the CRT+41. However, the minimum unit of data processing in the CPU (2), the CRTC (31) The minimum pixel spacing on the CRT+41 is determined by the resolution of 41.As a numerical value representing such resolution, there are 2 pixels in the X-axis direction of the CRT+41, and L pixels in the y-axis direction. Suppose it exists.

In conventional devices, the lengths N and M in the x and y directions on the tablet (1), which correspond to L pixel intervals, are fixed respectively, and the CPU (21) The signal with only the integer part taken is X□.

Signal line (c) as yo, ldl as CRT
C (entered in 31.

The CRTC131 converts the position data (x, yl) into raster scanning brightness modulation data and sends it to the CRT via the signal line (el).
(4) and display this.

Therefore, when the tablet pen (11) moves along a line on the tablet (1), a line similar to this line is
(4) Displayed on top. The operator observes the lines (and even figures made up of lines) on the CRT T4), makes unnecessary corrections, and when the desired figure is obtained, the data is transferred to the CRT.
Operate so that it is stored in the PU t21 or CRTC (31).

[Problem that the invention seeks to solve]

When attempting to input a figure using the tablet (1), if the figure is minute, an enlarged figure of this minute figure is drawn on the tablet (1), and this drawn figure is scaled and displayed on the CRT. It is more convenient to display it on the f41, and conversely, if the figure to be input is a large figure and a simple figure, draw a reduced figure of this large figure on the tablet (1). However, it is more convenient to display the drawn figure enlarged.

However, in conventional devices, the display magnification rate is a fixed value determined by the current value, and there is a problem in that the display magnification rate cannot be changed as necessary.

This invention was made to solve the above-mentioned problems, and aims to enable the display magnification rate to be changed arbitrarily depending on the situation.

[Means for solving problems]

In this invention, the position data "yox" from the graphic input device is
The signal obtained by taking the integer part of 4 is output as X1. Therefore, by changing S for the same input (xo, yo), the output of (x, y,) can be changed.

[Effect]

By changing S, the figure on the tablet and CR
Since you can freely change the scale ratio of the figure on the T, you can draw the figure on the tablet with the most convenient dimensions for drawing, display it on the CRT at the desired size, and then display it on the CRT. A figure defined by dimensions can be entered into a calculator.

〔Example〕

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

FIG. 1 is a program diagram showing an embodiment of the present invention, in which the same reference numerals as in FIG. 6 indicate the same or corresponding parts, and (f) is a signal line connecting the tablet (1) to the CPU. Data S for determining the display magnification rate is sent to 21.

FIG. 2 is a connection diagram showing an embodiment for generating the signal (data that determines the display magnification) S on the signal line (f) in FIG. Similarly to the tablet pen, (12) is a spring, (13) is a pen shaft, (14) is a power supply, (15) is a variable resistor, (16) is an analog-to-digital converter (hereinafter abbreviated as NΦ), (17) ) is the output terminal of the signal S, (18) is the latch % (19) is the resistor,
(20) is a push button switch. Also, (f)
, (g), lh), and (i) indicate signal lines, respectively.

Depending on the strength of the pressure applied to the tablet pen (11), the pen shaft (13) moves up and down in balance with the spring (12), and the contact fixed to the pen shaft (13) moves up and down, and this contact acts as a variable resistor. The voltage on the signal line (g) changes according to the pressure of pressing the tablet pen (11), and this changing voltage becomes the sliding contact of the A/D (16).
The signal is input to the signal line (h) and output as a digital signal onto the signal line (h). When the push button switch (20) is pressed, a load signal is input to the latch (18) via the signal line (i),
At that time, the digital signal on the signal line thl is latched (1
8) and output as data S from the terminal (17) via the signal line tfl.

As a practical matter, the value of S does not need to change minutely, and a stepwise change of several steps is sufficient, so the number of output bits of H(16) may be about 2 to 3 bits. To change the value of S, change the pressure applied to the tablet pen (11) and press the push button switch (2o) at an appropriate pressure point.

FIG. 3 is a connection diagram showing another embodiment for generating the signal S, in which the same reference numerals as in FIG. 2 indicate the same or corresponding parts, and (
21) is an adjustment knob attached to the sliding contact of the variable resistor (15), and fixing the knob (21) at an appropriate point is done by pressing the latch (18) in Figure 2 at an appropriate point. This is equivalent to inputting a load signal from the button switch (20), and the other operations are the same as those shown in FIG. 2 using the connections shown in FIG. 3.

FIG. 4 is an explanatory diagram showing still another embodiment for generating the signal S, in which the same reference numerals as in FIG. 3 indicate the same or corresponding parts, and a joystick is used as a graphic input device.
ck ) is used, (22)
is the joystick operation unit, (23) is the Y direction VR, (
24) tlX direction VR1 (25) Id Is the stick body. As far as the generation of the signal S is concerned, the device of FIG. 4 operates in the same way as the device of FIG.

FIG. 5 is an explanatory diagram showing still another embodiment for generating the signal S, in which the same reference numerals as in FIG. 4 indicate the same or equivalent parts, and when a mouse is used as the graphic input device. (31) is the mouse body, (3
2) is an X-direction rotary encoder, and (33) is a Y-direction rotary encoder. Limits 9 regarding the generation of signal S;
The apparatus of FIG. 5 operates similarly to the apparatus of FIG.

Note that the operations of the joystick and mouse as graphic input devices are well known in the art, so their explanation will be omitted.

Returning to the explanation of Fig. 1, the calculation is performed using the signal lines (a), fb), and the integer parts X□, y□ are connected to the signal line (
C).

(d) The figure is output on the fi CRT+41 by the same operation as described in connection with FIG.

As described above, a graphic input from a graphic input device such as a tablet is enlarged according to the magnification ratio determined by the data S and displayed on the CRT. Also, by appropriately limiting the value obtained with S, X. The calculation of xSN”Ox5M can be performed using simple hardware logic.

For example, if 5=28 and the value obtained by 8 is limited to an integer or 0, multiplication by S becomes an operation that simply shifts the multiplicand on a shift register.

〔Effect of the invention〕

As described above, according to the present invention, an appropriate display magnification ratio can be set, and graphics can be displayed quickly and accurately on the display screen.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIGS. 2, 3, 4, and 5 each show an example of a circuit that generates data that determines the display magnification ratio in FIG. 1. Connection diagram FIG. 6 is a block diagram showing a conventional device. In the figure, (1) is a tablet (graphic input device #, ), (
2) is CPU, (31 is CRTC, (41 is CRT,
(11) is a tablet pen, (14) is a power supply, (1
5) is a variable resistor, (16) is an A/D, and (17) is a data output terminal for determining the display magnification rate.% (21) is a slide contact knob of the variable resistor. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A figure input device that sequentially outputs position data of each point on a line that constitutes a figure drawn on the plane in terms of rectangular coordinates on the plane, and a case where the position data currently being output from this figure input device is displayed on a display device. A means for outputting data that determines the display magnification rate of each point, inputs the position data of each point and data that determines the display magnification rate, and magnifies the display to the distance between the two points determined by the position data of any two points. A graphic display device comprising means for displaying the position of each of the points on the display device by using a distance multiplied by a ratio as the distance between the two points on the display device.