JP2003216588A - Graph display control device, graph display control system and graph display control program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform a working processing/arithmetic processing for a received graph and to display the graph easy to be seen, even when enlarging/reducing the received graph, in a graph display control device capable of transmitting and receiving the graph to/from an other device. <P>SOLUTION: In a graph display system, a function electronic calculator makes coordinate data of a designated range (four apexes P1 to P4) of displayed function graphs f1 and f2 (a) correspond to function formula data therefor and transmits the data to a PC ((b) and (c)). The PC receives the data transmitted from the function electronic calculator, sets a range (display range) based on the received coordinate data, and displays the function graphs f1 and f2 based on the function formula corresponding to the coordinate data in this range (d). <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graph display control device, a graph display control system and a graph display control program.

[0002]

2. Description of the Related Art A scientific calculator having a graph drawing function is known as a typical example of a conventional graph display control device.
This scientific calculator is a system that when a function formula is input and an instruction to draw a function graph is given, calculation and analysis are automatically performed and a function graph corresponding to the input function formula is drawn on the display screen. is there. Since the relationship between variables in a function formula is expressed by a graph and the features of the function formula can be easily grasped visually, the scientific calculator is widely used for learning mathematics, engineering calculation of engineers, and the like.

Further, it has a function of transmitting a graph created by this scientific calculator to an electronic device such as another scientific calculator, and, on the contrary, a function of receiving and displaying a graph transmitted from another electronic device. Scientific calculators are also known. The transmission of a graph between a plurality of such electronic devices (more accurately, an electronic device having a graph drawing function (graph display control device), including the above-mentioned scientific calculator) is created by one electronic device. It was generally realized by transmitting the bitmap data of the entire graph to the other electronic device.

[0004]

However, when transmitting and receiving the bitmap data of the entire graph, there are the following drawbacks.

That is, when the display screen density of the electronic device on the transmission side (for example, a scientific calculator) is rough (when the number of vertical and horizontal pixels is small), bitmap data corresponding to the rough density is transmitted. . As a result, in an electronic device on the receiving side, for example, when it is desired to see a part of the received graph, the received bitmap data is enlarged, but since the density of the bitmap data is coarse, jaggies occur. It was a difficult graph to see. Furthermore, since the data is bitmap data, it is difficult to perform calculation processing such as calculating the coordinates of the intersection of the received graph and another graph, and obtaining the area.

Further, there is a one-to-one correspondence between the graph (bitmap data) transmitted by the transmitting electronic device and the graph (bitmap data) which the receiving electronic device can receive and display at one time. . That is, in the electronic device on the receiving side, due to the relationship between the coordinate system to be displayed and the range (display range),
Even when a plurality of graphs are received, it is difficult to superimpose the plurality of graphs on one screen. Furthermore, in the case of forced display, it is necessary to enlarge / reduce the graph, which causes the problem of jaggies described above, making the graph difficult to see.

An object of the present invention is to enable a processing / arithmetic processing on a received graph in a graph display control device on the receiving side, and even when the received graph is enlarged / reduced. It is to be able to display a graph that is easy to see.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 is a graph display control device for displaying a graph on a display unit based on given function formula data (for example, FIG. 1). Function calculator 100), a range designating unit (eg, a transfer range of the embodiment) for designating a range (for example, a transfer range of the embodiment) of a display part to be transmitted to another device in the graph displayed on the display part. 2, the input unit 120 of FIG. 2 and a transmission unit (for example, the communication control unit of FIG. 2) that transmits the coordinate data corresponding to the range designated by the range designation unit and the functional expression data to the other device. 1
40) and are provided.

According to the first aspect of the invention, for example, the coordinate data corresponding to the graph portion in the range specified by the user in the graph currently displayed on the display unit and the specified range. The function formula data corresponding to the graph of can be transmitted to another device.

Therefore, another device which is the destination of the graph can display the graph portion without receiving the graph in the specified range as bitmap data. Therefore, there is a problem that occurs because the bitmap data of the entire graph is transmitted as in the past, for example, when the graph is enlarged / reduced, it becomes difficult to see the graph. It is possible to solve the problems that a plurality of graphs cannot be displayed in a superimposed manner on one display screen and that arithmetic processing on a plurality of images is difficult.

Further, the invention according to claim 2 is, in a graph control device (for example, PC 200 in FIG. 1) for displaying a graph on a display portion based on given functional expression data,
Receiving means (for example, the communication control section 240 in FIG. 4) that receives the coordinate data and the functional formula data transmitted from another device (for example, the scientific calculator 100 in FIG. 1), and the coordinate data received by this receiving means. And a display control unit (for example, CPU 210 in FIG. 4) for displaying a graph based on the functional formula data as a new display coordinate.

According to the second aspect of the present invention, the coordinate data and the function formula data transmitted from another device are received, and the received coordinate data is set as a new display coordinate.
A graph based on the received functional expression data can be displayed.

That is, the graph transmitted from another device is received as coordinate data and functional expression data, not the bitmap data as in the conventional case. For this reason, it is possible to always display an easy-to-see graph without being affected by the difference with the display screen density of another device that is the transmission source.

Further, since the received graph is the coordinate data and the function formula data, it is possible to perform the arithmetic processing such as calculating the intersection of the received graph and another graph or obtaining the area.

Further, when it is desired to enlarge / reduce the received graph, the display coordinates are changed according to the magnification, and the graph based on the function formula data is drawn again with the changed display coordinates to obtain a desired portion. The graph of can be easily obtained. Also in this case, since it is not affected by the display screen density of the other device that is the transmission source of the graph, there is no problem such as jaggies in the graph, and the graph can be displayed easily.

Further, as in the invention described in claim 3, in the graph display control device according to claim 2, the receiving means receives a plurality of coordinate data and functional expression data corresponding to each coordinate data. Then, selecting means for selecting the target functional expression data from the plurality of functional expression data received by the receiving means (for example, the input unit 120 in FIG. 2).
Further, the display control means generates new display coordinates from the coordinate data corresponding to the function formula data selected by the selecting means, and a graph based on the selected function formula data is displayed on the new display coordinates. It may be configured to display.

According to the third aspect of the present invention, a plurality of coordinate data and functional formula data corresponding to each coordinate data transmitted from another device are received, and the plurality of received functional formulas are received. New display coordinates can be generated based on the coordinate value data corresponding to the selected function formula data among the data.

Therefore, even if a plurality of graphs to be displayed have different coordinate systems or ranges, a new coordinate system or range corresponding to the selected function formula data can be generated. It is possible to always display the graph selected from among the above according to the purpose in an easy-to-see manner.

Further, in the graph display control apparatus according to the second aspect of the present invention, the receiving means receives a plurality of coordinate data and functional expression data corresponding to the respective coordinate data. However, the display control means may be configured to superimpose and display graphs corresponding to the plurality of functional expression data received by the receiving means.

According to the fourth aspect of the present invention, a plurality of coordinate data and function formula data corresponding to each coordinate data are received, and a graph based on each function formula data is converted into corresponding coordinate data. Can be overlaid and displayed as display coordinates. Therefore, it is possible to receive a plurality of graphs transmitted from one device, or to receive a graph transmitted from each of a plurality of other devices and simultaneously display these plurality of graphs.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, three preferred embodiments of the present invention will be described in detail with reference to the drawings. [First Embodiment] First, a first embodiment will be described.

FIG. 1 is a diagram showing a schematic configuration of a graph display control system 10 according to the first embodiment. According to the figure, the graph display control system 10 includes a scientific calculator 10
0 and a personal computer (hereinafter referred to as “PC”) 200 are connected via a communication line N.

The scientific calculator 100 and the PC 200 are mutually accessible via a communication line N. The communication line N is a known data transmission line for enabling data transmission between the scientific calculator 100 and the PC 200, and may be wireless such as infrared rays or may be wired. Good.

The scientific calculator 100 has a calculation function as a conventional scientific calculator, and also has a graph drawing function for drawing a function graph corresponding to a given function formula on a display screen.

Further, the scientific electronic calculator 100, when the transmission instruction of the functional graph is issued, the specified range (hereinafter,
It is called "transmission range". ), More specifically, a designated range (for example, X coordinate is “0” to “10”, Y) in the display coordinate system (in the present embodiment, the XY coordinate system).
The coordinates are in the range of "-5" to "+5". ), And the function formula data corresponding to the function graph, P
Send to C200.

The PC 200 is realized by a general-purpose computer or the like and has a graph drawing function for drawing a function graph corresponding to a given function expression on the display screen, like the scientific calculator 100. PC200 is scientific calculator 10
When the transmission range data and the functional formula data transmitted from 0 are received, the range is set by setting the minimum value and the maximum value of the X coordinate and the Y coordinate in the display coordinate system based on the transmission range data. Then, a function graph based on the received function data included in the set range is drawn on the display screen.

Next, the internal structure of the scientific calculator 100 and the PC 200 will be described. FIG. 2 is a block diagram showing the internal configuration of the scientific calculator 100. According to the figure, the scientific calculator 100 has a CPU (Central Processing Unit) 11
0, input unit 120, display unit 130, communication control unit 140,
RAM (Random Access Memory) 150, ROM (Read
Only memory) 160 and an external storage unit 170, and these units are connected by a system bus 180 so that data can be transmitted and received.

The CPU 110 integrally controls each constituent element of the scientific electronic calculator 100 and executes various processes.
When executing these various processes, the CPU 110 causes the ROM
The RAM 15 stores system programs and various processing programs stored in the 160 and the external storage unit 170, various data according to various instruction signals input from the input unit 120, and the like.
It is stored in 0, and R is stored according to the input instruction and input data.
Various processes according to the program stored in the AM 150 are sequentially executed, and the processing result is stored in a predetermined area of the RAM 150 and displayed on the display unit 130. In this way, the CPU 110 executes the programs stored in the ROM 160 or the external storage unit 170, whereby various functions of the scientific calculator 100 are realized.

The CPU 110 also executes a graph transmission process (see FIG. 7) according to the graph transmission program 161 stored in the ROM 160. That is, in this graph transmission process, when a function formula is input from the input unit 120, the CPU 110 causes the display unit 130 to display a function graph corresponding to this function formula, and also specifies the transmission range from the input unit 120. And the transmission range data and the function formula data of the displayed function graph on the PC 200.
Send to.

The input section 120 is for inputting a function expression, designating a transmission range of a displayed function graph, and instructing transmission of graph data. The input unit 120 is composed of a ten-key pad, a keyboard, or the like, and when these keys are operated, it outputs an operation signal corresponding to the operation to the CPU 110. The input unit 120 may be a touch panel or the like integrally formed with the display unit 130.

The display unit 130 is an LCD (Liquid Crystal).
Display) and the like, and the input data from the input unit 120 and the CPU 110 according to the display signal from the CPU 110.
Execution results of various processes according to, for example, FIGS.
The display screen shown in is displayed.

The communication control unit 140 is an interface for transmitting and receiving various data and the like to and from the PC 200 via the communication line N, and is, for example, a USB (Universal Seri).
al Bath) serial input / output terminals such as ports and parallel input / output terminals, and communication equipment conforming to the Ethernet (R) standard, infrared communication equipment conforming to the IrDA standard, Blue
It is composed of a wireless communication device conforming to the tooth (R) standard.

The RAM 150 stores various processing programs and
A program memory for temporarily storing data and the like generated by the execution of this program, a program memory for expanding the various programs, an input instruction and data input from the input unit 120, a processing result by the execution of the program Etc., and forms a work memory for storing various data related to the program. Further, the RAM 150 particularly forms a transmission data memory 151 for storing transmission range data and functional formula data to be transmitted to the PC 200.

FIG. 3 is a diagram showing the structure of the transmission data memory 151. According to the figure, the transmission data memory 151
Is composed of a transmission range data memory 151a and a function formula data memory 151b.

The transmission range data memory 151a stores transmission range data indicating a designated transmission range. Specifically, the transmission range data includes four vertices p1 to p4 ( The coordinate value data of FIG. 6B) is included.

The function formula data memory 151b stores the function formula data representing the function formula. The function formula data memory 151b stores the function formula data corresponding to each displayed function graph. That is, as shown in FIG. 6A, when two function graphs f1 and f2 are displayed, a total of two function formula data corresponding to each are stored.

The ROM 160 is a non-volatile memory that stores various programs corresponding to the scientific calculator 100 in a form readable by the CPU 110. This program includes, for example, a system program of the scientific calculator 100, a program for realizing a graph drawing function, and a graph transmission program 161 for realizing a graph transmission process (see FIG. 7) described later.

The system program is a program for causing the CPU 110 to realize the basic functions of the scientific calculator 100.
The PU 110 identifies, for example, a signal input from the input unit 120 as a numerical value or a functional formula and stores it in the RAM 150, a process of storing data stored in the RAM 150 in another storage location, a numerical calculation process, a functional formula. And processing of displaying numerical values in various display forms on the screen, processing of transmitting and receiving data to and from other devices via a communication line, and the like.

The external storage section 170 is provided with a storage medium readable by the CPU 110, such as a magnetic / optical storage medium or a semiconductor memory, in which programs and data are stored in advance. In addition, this storage medium,
External storage unit 17 such as a CD-ROM or a memory card
It may be removable to zero.

The programs, data, etc. stored in the external storage unit 170 may be partially or wholly received by the communication control unit 140 via a transmission medium such as a communication line. In this case, for example, a program, data or the like may be downloaded from a server built on the network to the external storage unit 170 via a transmission medium, or may be built on the network. A storage medium in the server, which is separate from the main body of the scientific calculator 100, may be used as the external storage unit 170.

FIG. 4 is a block diagram showing the internal structure of the PC 200. According to the figure, the PC 200 has a CPU 2
10, input unit 220, display unit 230, communication control unit 24
0, RAM 250, ROM 260 and external storage unit 270.
These units are connected to each other via a system bus 280 so that data can be transmitted and received.

The CPU 210 integrally controls each constituent element of the PC 200 and executes various processes. When executing these various processes, the CPU 210 causes the ROM 26 to
0, the system program and various processing programs stored in the external storage unit 270, various data according to various instruction signals input from the input unit 220, and the communication control unit 240.
Various data and the like transmitted from the scientific electronic calculator 100 via the RAM 250 are stored in the RAM 250, various types of processing according to the programs stored in the RAM 250 are sequentially executed according to the stored data, input instructions, etc., and the processing results are displayed. RAM250
Stored in a predetermined area of the display unit 230 and displayed on the display unit 230. In this way, the ROM 260 and the external storage unit 27
Various functions of the PC 200 are realized by the CPU 210 executing the programs stored in 0.

The CPU 210 also executes a graph receiving process (see FIG. 8) according to the graph receiving program 261 stored in the ROM 260. That is, in the graph receiving process, the CPU 210 receives the transmission range data and the function formula data transmitted from the scientific electronic calculator 100, and displays the function graph based on the received data on the display unit 230.

The input section 220 is composed of a keyboard provided with character keys, numeral keys, various function keys and the like, or a pointing device such as a mouse and a tablet.
When these are operated, an operation signal corresponding to the operation is output to the CPU 210. For example, the input unit 220
Is used for an operation of giving a display instruction to the function graph displayed on the display unit 230 based on the data received from the scientific calculator 100.

The display section 230 is an LCD or CRT (Cathod).
e Ray Tube) or the like, and according to a display signal input from the CPU 210, input data from the input unit 220,
Execution results of various processes by the CPU 210, for example, FIG.
The display screen shown in (d) is displayed.

The communication control unit 240 is an interface for transmitting and receiving various data and the like to and from the scientific electronic calculator 100 via the communication line N, and has, for example, a serial input / output terminal such as a USB port and a parallel input / output terminal. , An Ethernet (R) standard communication device, an IrDA standard infrared communication device, a Bluetooth (R) standard wireless communication device, and the like.

The RAM 250 stores various processing programs and
It is for temporarily storing data and the like generated by the execution of this program, and is a program memory for expanding the various programs, input instructions and data input from the input unit 220, and processing results by the execution of the program. Etc., and forms a work memory for storing various data related to the program.

Further, the RAM 250 is, in particular, the scientific calculator 1
00 to form a reception data memory 251 for storing the transmission range data and the functional formula data received.

FIG. 5 is a diagram showing the configuration of the reception data memory 251. According to the figure, the reception data memory 251
Is composed of a transmission range data memory 251a and a function formula data memory 251b.

The transmission range data memory 251a stores the transmission range data received from the scientific electronic calculator 100. That is, the transmission range data memory 251a stores the coordinate value data of the four vertices p1 to p4 of the transmission range.

The function formula data memory 251b stores the function formula data received from the scientific calculator 100. The functional formula data memory 251b stores one or a plurality of functional formula data, like the functional formula data memory 151b in FIG.

The ROM 260 is a non-volatile memory that stores various programs corresponding to the PC 200 in a form readable by the CPU 210. This program includes, for example, a system program of the PC 200, a program for realizing a graph drawing function, a graph receiving program 261 for realizing a graph receiving process (see FIG. 8) described later, and the like.

The external storage unit 270 is provided with a storage medium readable by the CPU 210, such as a magnetic / optical storage medium in which programs and data are stored in advance, or a semiconductor memory. In addition, this storage medium,
External storage unit 270 such as a CD-ROM or a memory card
It may be removable.

The programs and data stored in the external storage unit 270 may be partially or wholly received by the communication control unit 240 via a transmission medium such as a communication line. In this case, for example, a program, data or the like may be downloaded from a server built on the network to the external storage unit 270 via a transmission medium, or may be built on the network. Also, a storage medium in the server, which is separate from the PC 200, may be used as the external storage unit 270.

Next, the operation of the scientific calculator 100 will be described with reference to FIG.
Description will be made with reference to the display screens of (a) to (c) and the flowchart of FIG. 7.

FIGS. 6A to 6C are diagrams showing display screens displayed on the display unit 130 of the scientific calculator 100. FIG. 7 is a flowchart for explaining the graph transmission process. This graph transmission process is a process executed according to the graph transmission program 161 stored in the ROM 160 under the control of the CPU 110.

In FIG. 7, the CPU 110 first sets the range for displaying the function graph. The range to be set may be a default range or a range defined as a default. Then, within the set range, the function graph corresponding to the function formula is displayed on the display unit 130 as shown in FIG. 6A, for example (step S11).

FIG. 6A is a diagram showing an example of the display screen of the display unit 130 displaying the function graph. According to the figure, the display screen has two
While two function graphs f1 and f2 are displayed,
A range (minimum value Xmin and maximum value Xmax of X coordinate, and minimum value Ymin and maximum value Yma of Y coordinate are displayed in the upper right part of the screen.
It is indicated by x. ) Is in the lower right part of the screen,
The function formulas corresponding to the two function graphs f1 and f2 represented by (2) are displayed. y = x ² −3 (1) y = 0.4x (2)

That is, FIG. 6A shows the above equation (1),
Function graph f corresponding to the two functional expressions represented by (2)
1 and f2 are displayed in a display range (that is, a range) of −10 ≦ x ≦ 10 and −6 ≦ y ≦ 6.

Then, on the display screen, the function graph f
The transmission ranges 1 and f2 are designated by the input unit 120 as shown in FIG. 6B, for example (step S1).
2).

FIG. 6B is a diagram showing an example of a transmission range designation screen displayed on the display unit 130. According to the figure, the transmission range designation screen displays the designated transmission range in addition to the graph display screen of FIG.

When the transmission range of the displayed function graph is designated in this way, the CPU 110 transmits the transmission range data indicating this transmission range, that is, the coordinate values of the four vertices p1 to p4 in FIG. 6B. Is extracted (step S1
3). For example, in FIG. 6B, the coordinate values of the four vertices p1 to p4 of the transmission range are extracted. Each coordinate value is represented as follows. p1 = (x1, y1) = (− 5, −0.5) p2 = (x2, y1) = (− 1, −0.5) p3 = (x2, y3) = (− 1, −2) p4 = (X1, y3) = (-5, -2)

Next, the CPU 110 stores the extracted coordinate value data of the vertices p1 to p4 in the transmission range data memory 151a of the RAM 150, and the above 2
Function formula data corresponding to two function graphs f1 and f2
It is stored in the functional formula data memory 151b. In this way, the CPU 110 stores the graph data relating to the function graph to be transmitted in the transmission data memory 151 of the RAM 150 (step S14).

Subsequently, the CPU 110 waits for the input of the confirmation instruction of the function graph to be transmitted from the input unit 120. When this confirmation instruction is given (step S
15: YES), the CPU 110 causes the display unit 130 to display a transmission graph confirmation screen for confirming the graph to be transmitted to the PC 200 (step S16), as shown in FIG. 6C, for example.

FIG. 6C is a diagram showing an example of the transmission graph confirmation screen. According to this figure, this transmission graph confirmation screen enlarges and displays the transmission range specified in FIG. 6 (b), and, as in FIG. 6 (a), the range (minimum value Xmin of the X coordinate Xmin). And the maximum value Xmax, and the minimum value Ymin and the maximum value Ymax of the Y coordinate), and the function formulas corresponding to the two function graphs f1 and f2 represented by the formulas (1) and (2). Each is displayed.

Here, the coordinate range of the display screen is the coordinate range and range to be transmitted. That is, Xmin is “−5 (= x1)” which is the x value of the vertices p1 and p4,
Xmax is the x value of the vertices p2 and p3, "-1 (=
x2) ". In addition, Ymin is the vertex p3 and p4
Is the y value of "-2 (= y3)", and Ym
ax is the y value of the vertices p1 and p2, which is “−0.5 (=
y1) ”.

That is, FIG. 6C shows equations (1) and (2).
The function graphs f1 and f corresponding to the two function expressions represented by
2 is displayed in the range of −5 ≦ x ≦ −1 and −2 ≦ y ≦ −0.5.

That is, in step S16, the CPU1
10 is a transmission range data memory 151a of the RAM 150
A range is set on the basis of the transmission range data stored in
The transmission graph confirmation screen as shown in FIG. 6C is displayed on the display unit 130 by drawing the function graphs f1 and f2 corresponding to the function formula data stored in 51b.

In step S15, when the confirmation instruction of the function graph to be transmitted is not issued (step S1)
5: NO), the CPU 110 directly executes the next step S17.
Move to.

In step S17, the CPU 110
Makes an access request to the PC 200, and the RAM 1
The data stored in the transmission data memory 151 of 50, that is, the transmission range data and the functional formula data, is transferred to the PC 20.
0 (step S17). Then, the graph transmission process is ended.

Next, the operation of the PC 200 will be described with reference to the display screen example of FIG. 6D and the flowchart of FIG.

FIG. 6D shows the display section 230 of the PC 200.
It is a figure which shows an example of the display screen displayed on FIG. Further, FIG. 8 is a flowchart for explaining the graph reception process. This graph reception process is a process executed by receiving an access request from the scientific calculator 100 and under the control of the CPU 210 according to the graph reception program 261 stored in the ROM 260.

According to FIG. 8, upon receiving the access request from the scientific calculator 100, the CPU 210 receives the transmission range data and the functional formula data that are subsequently transmitted from the scientific calculator 100 (step S31). Then, the received data is stored in the reception data memory 251 of the RAM 250 (step S32).

That is, the CPU 210 stores the transmission range data in the transmission range data memory 251a, and
The function formula data is stored in the function formula data memory 251b. Further, here, when it is confirmed that the graph data is normally received, the CPU 210 notifies the scientific calculator 10 of that fact.
Notify 0.

Next, the CPU 210 waits for a graph display instruction based on the received data to be input from the input section 220 (step S33). When the display instruction is issued (step S33: YES), the CPU 210, for example, based on the data received, that is, the data stored in the reception data memory 251 of the RAM 250, the CPU 210 of FIG.
A graph display screen as shown in (d) is displayed on the display unit 230 (step S34). Then, the graph receiving process is ended.

FIG. 6D is a diagram showing an example of the graph display screen. In the figure, the graph display screen is shown in FIG.
Similar to (c), the coordinates are determined using the transmission range specified in FIG. 6 (b) as a range, and equations (1) and (2) are used.
The function graphs f1 and f2 corresponding to the above two function equations are displayed, and the range is displayed in the upper right part of the screen, and the two function expressions are displayed in the lower right part of the screen.

That is, in FIG. 6D, as in FIG. 6C, the function graphs f1 and f2 corresponding to the two function expressions represented by the expressions (1) and (2) are expressed by −5 ≦ x. ≤-1, -2≤y
It is displayed in the range of ≤-0.5.

That is, in step S34, the CPU 2
10 is a transmission range data memory 251a of the RAM 250
A range is set on the basis of the transmission range data stored in
By drawing the function graphs f1 and f2 corresponding to the function formula data stored in 51b, the graph display screen as shown in FIG. 6D is displayed on the display unit 230.

When the display instruction of the transmitted function graph is not issued in step S33 (step S3)
3: NO), and this graph reception process ends.

As described above, in the graph display control system 10 according to the first embodiment, the scientific calculator 100 is used.
Transmits the function graph of the designated transmission range to the PC 200, and the PC 200 displays the function graph transmitted from the scientific electronic calculator 100 in the designated transmission range.

The data transmitted from the scientific electronic calculator 100 to the PC 200 is not the bitmap data but the functional formula data and the transmission range data. Therefore, even when the graph displayed by the PC 200 is enlarged on the basis of the received data, jaggies do not occur and the graph is not difficult to see. Further, in the PC 200, first,
Since the range is set on the basis of the transmission range data, the PC 200 is in the range intended by the user of the scientific calculator 100.
You can display the graph above. Furthermore, PC20
0 can also perform arithmetic processing on the received functional expression data.

[Second Embodiment] Next, a second embodiment will be described. In the second embodiment, the scientific calculator 100 in the first embodiment transmits data relating to a plurality of function graphs, and the PC 200 displays a plurality of function graphs based on the received data. This is the main difference from the first embodiment. Therefore, the difference will be mainly described below, and the same elements as those in the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted.

First, the operation of the scientific electronic calculator 100 according to the second embodiment will be described with reference to the display screens of FIGS. 9A to 9D and the flowchart of FIG. 7.

Here, FIGS. 9A to 9D are diagrams showing examples of display screens displayed on the display unit 130 of the scientific electronic calculator 100. Further, FIG. 10 is a flowchart for explaining the graph transmission process.

According to FIG. 10, the CPU 110 firstly
The processes of steps S11 to S16 are executed as in the first embodiment.

That is, a graph display screen on which a function graph corresponding to the input function formula is drawn is displayed on the display unit 130 as shown in FIG. 9A (step S1).
1). Then, for example, as shown in FIG. 9B, when the first transmission range A is designated (step S12), the CP
U110 is transmission range data representing the transmission range A,
The function formula data relating to the function graph existing in the transmission range A is stored in the transmission data memory 151 of the RAM 150 (steps S13 and S14).

Next, a transmission graph confirmation screen for confirming the data of the function graph to be transmitted is displayed, for example, in FIG. 9 (c).
As shown in FIG.
15, S16). The CPU 110 then uses the input unit 12
When a data transmission instruction is input from 0 (step A165), the transmission range data and the functional formula data stored in the transmission data memory 151 are transmitted to the PC 200 (step S17).

After the transmission, if the data transmission of the function graph is finished (step A180: YES), the CPU 110
Shifts to the next step A190. In addition, when data transmission of the function graph is further continued (step A
180: NO), the process proceeds to step S12, and the processes of steps S12 to S17 are repeatedly executed again.

That is, the CPU 110 does not finish the data transmission of the function graph after transmitting the data relating to the function graph of the transmission range A (step A180: NO), and the step S1.
Move to 2. Then, by executing the processing of steps S12 to S17 again, as shown in FIG. 9B, the data related to the function graph of the second designated transmission range B is transmitted to the PC 200.

In step A180, if an input to end the data transmission is made (step A18
0: YES), the CPU 110 notifies the PC 200 of the completion of transmission (step A190), and then ends this processing.

Next, the operation of the PC 200 will be described with reference to FIG.
This will be described with reference to the display screen of (f) and the flowchart of FIG. Here, FIGS. 9E to 9F show the PC 2
It is a figure which shows the display screen displayed on the display part 230 of 00. Further, FIG. 11 is a flowchart for explaining the graph reception process.

In FIG. 11, the CPU 210 firstly
The processes of steps S31 to S34 are executed as in the first embodiment. That is, the transmission range data and the function formula data transmitted from the scientific calculator 100 are received (step S3).
1) The received data is stored in the received data memory 251 of the RAM 250 (step S32). Then, the graph display screen in which the function graph is drawn based on the received data is displayed on the display unit 230, for example, as shown in FIG. 9 (e) (steps S33 and S34).

Then, in step B350, when the scientific electronic calculator 100 notifies the end of data transmission (step B350: YES), the CPU 210
Ends the graph receiving process. If there is no notification of the end of data transmission (step B350: NO),
The process proceeds to step S31, and steps S31 to S34 are performed again.
The process of is executed.

For example, in FIG. 9, the CPU 210
After receiving the function graph of the transmission range A, the scientific calculator 1
00 does not notify that the data transmission is to be ended (step S35: NO), the process proceeds to step S31, and the processes of steps S31 to S34 are executed again. Therefore, as shown in (f) of the same figure, the data of the function graph of the transmission range B is received.

In this way, when the function graphs of the two transmission ranges A and B are transmitted from the scientific calculator 100, the CPU 210 notifies the scientific calculator 100 of the end of data transmission in step B350. (Step B350: YES). Then, after being notified of the end of the transmission, the CPU 210 ends the present process.

As described above, in the graph display control system 10 according to the second embodiment, the scientific calculator 100 is used.
Specifies a plurality of different transmission ranges, and sequentially transmits the data of the function graph relating to each designated transmission range to the PC 200. Then, the PC 200 displays the function graph sequentially received from the scientific calculator 100 in each of the designated transmission ranges. Therefore, in the second embodiment, the first
It is possible to obtain the same effect as that of the above embodiment and to transmit / receive data relating to a plurality of function data.

[Third Embodiment] Next, a third embodiment will be described. In the third embodiment, a plurality of scientific calculators 100 according to the second embodiment and a PC 200 are used.
The PC 200 receives the function graph transmitted from each scientific calculator 100. The main difference from the second embodiment is that a plurality of function graphs are superposedly displayed on one screen based on the received data. Therefore, this difference will be mainly described below, and the same elements as those in the second embodiment will be designated by the same reference numerals and the description thereof will be omitted.

FIG. 12 is a diagram showing a schematic configuration of the graph display control system 20 according to the third embodiment. As shown in the figure, the graph display control system 20 includes a plurality of scientific calculators 100 and a PC 200.

In the figure, three scientific calculators 100 are shown.
Is shown, but of course, any number may be used.

The configurations of the scientific calculator 100 and the PC 200 are almost the same as the configurations according to the second embodiment described with reference to FIGS.

However, in FIG. 4, the RAM of the PC 200
The reception data memory 251 formed in 250 stores the graph data table 251c and also stores in the ROM 2
Reference numeral 60 stores a graph synthesis processing program for executing a later-described graph synthesis display process (see FIG. 15).

FIG. 13 shows the graph data table 251c.
It is a figure which shows the structure of. According to the figure, the graph data table 251c stores a plurality of graph data configured by associating functional expression data, transmission range data, and a combined display flag.

Further, this graph data is stored in the scientific calculator 10.
Every time data related to the function graph (function formula data and transmission range data) is transmitted from 0, new graph data is generated and additionally stored in the graph data table 251c.

The composite display flag is a flag indicating whether or not the corresponding function expression data is a function expression to be combined and displayed. Specifically, when this flag is "ON", it indicates that it is a combined display target, and when it is "OFF", it indicates that it is not a combined display target.

The composite display flag is "OFF" when the graph data is generated, that is, when the graph data is received from the scientific electronic calculator 100. Then, in the graph combination display processing described below, when selected as a combination display target, it becomes “ON”, and the function graph related to the graph data is combined and displayed in a superimposed manner with another function display target function graph. become.

Next, the operation of the scientific calculator 100 will be described with reference to FIG.
This will be described with reference to the display screens of (a) to (c) and the flowchart of FIG.

Here, FIGS. 14A to 14C show the display screens of the three scientific calculators 100, particularly the transmission graphs displayed on the display unit 130 of the scientific calculator 100 in step S16 of FIG. It is a figure which shows a confirmation screen.

The three scientific calculators 100 shown in FIG. 12 (each of which is referred to as scientific calculators A, B, and C) independently execute the graph transmission process according to the graph transmission program 161 stored in the ROM 160. To do.

Specifically, the scientific electronic calculator A transmits the data of the function graph shown in FIG. 14A to the PC 200 by executing the graph transmission process.

That is, the scientific calculator A has two functional expressions y = x.
² −3, functional formula data representing y = 0.4x, and −10 ≦
The transmission range data representing the transmission range of x ≦ 10 and −6 ≦ y ≦ 6 will be transmitted to the PC 200.

Further, the scientific calculator B executes the graph transmission process to transmit the data of the function graph shown in FIG. 14B to the PC 200, for example.

That is, the scientific calculator B has two functional expressions y = x.
² -5, and function formula data representing y = 0.4x-2, -1
The transmission range data representing the transmission range of 0 ≦ x ≦ 10 and −6 ≦ y ≦ 6 will be transmitted to the PC 200.

Further, the scientific calculator C transmits the function graph shown in FIG. 14C to the PC 200 by executing the graph transmission process.

That is, the scientific calculator C has one functional expression y =-
functional expression data representing x, -6≤x≤6, -6≤y≤6
And the transmission range data representing the transmission range of No. 1 will be transmitted to the PC 200.

Next, the operation of the PC 200 will be described with reference to FIG.
Will be described with reference to the display screen of FIG.

Here, FIG. 14D shows the display screen of the PC 200, and in particular, in step S60 of FIG.
FIG. 6 is a diagram showing an example of a graph display screen displayed on a display unit 230 of 200.

Each time the PC 200 receives an access request from each scientific electronic calculator 100, it executes a graph receiving process (see FIG. 11) according to the graph receiving program 261 stored in the ROM 260.

However, during execution of this graph receiving process,
In step S32 of 1, the CPU 210 generates graph data in which the transmission range data of the similarly received graph data is associated with each function formula data included in the received data, and additionally stores the graph data in the graph data table 251c.

For example, from the scientific calculator A, FIG.
The function formula data and the transmission range data of the function graph shown in are transmitted. In this case, the received data includes a total of two function formula data corresponding to the function graphs f1 and f2.

Therefore, the CPU 210 generates graph data by associating the received transmission range data with each functional formula data, and additionally stores the graph data in the graph data table 251c. That is, two new graph data are additionally stored in the graph data table 251c.

Further, from the scientific calculator B, the function formula data and the transmission range data of the function graph shown in FIG. 14B are transmitted. Similar to the case of the scientific calculator A, graph data in which each of the two function formula data is associated with the similarly received transmission range data is generated and additionally stored in the graph data table 251c.

Further, from the scientific calculator C, the function formula data and the transmission range data of the function graph shown in FIG. 14C are transmitted. In this case, since it is one function formula data,
Graph data in which the functional expression data and the received transmission range data are associated with each other is generated and additionally stored in the graph data table 251c.

That is, the PC 200 has three scientific calculators A to C.
By receiving the data transmitted from each of them, a total of five graph data are additionally stored in the graph data table 251c.

Further, the PC 200 executes the graph synthesis display processing (see FIG. 15) according to the graph synthesis display program stored in the ROM 260.

FIG. 15 is a flow chart for explaining the graph synthesis display processing. This graph composition process
After the graph receiving process is executed, it is a process executed under the control of the CPU 210 in accordance with the graph synthesizing display program stored in the ROM 260.

According to FIG. 15, the CPU 210 first
Graph data table 2 stored in RAM 250
The first graph data is read from 51c (step S51). Then, the graph display screen in which the function graph is drawn based on the read graph data is displayed on the display unit 230 (step S52).

Next, the CPU 210 waits for the input of the input of the function graph as to whether or not the function graph is to be combined and displayed. Then, when the instruction to make the combination target is given (step S53: YES), the CPU 21
0 sets the composite display flag of this graph data to "ON"
(Step S54). On the other hand, if the instruction not to combine is given (step S53: NO), CP
U210 sets the composite display flag of this graph data to
Leave it "OFF".

After that, the CPU 210 repeatedly executes the processes of steps S51 to S54 for all the graph data, with the second and subsequent graph data as the processing targets (step S55). Then, when the processes of steps S51 to S54 are performed on all the graph data (step S55: NO), the CPU 210 proceeds to the next step S5.
Go to 6.

In step S56, the CPU 210
Of the graph data stored in the graph data table 251c of the RAM 250, the composite display flag is “O”.
One piece of graph data having "N" is read (step S56). Then, the minimum value and the maximum value of the X coordinate and the minimum value and the maximum value of the Y coordinate of the transmission range are extracted from the transmission range data included in the read graph data (step S57).

The CPU 210 carries out steps S56 to S56.
The processing of 57 is repeatedly executed for all the graph data for which the composition flag is “ON” (step S
58). Then, when the processes of steps S56 to S57 are performed for all the graph data whose synthesis flag is "ON" (step S58: NO), the CPU 210
Shifts to the next step S59.

In step S59, the CPU 210
Sets a new range including all coordinate values of all graph data extracted in step S57 (step S59). More specifically, a new range is set by selecting the maximum value and the minimum value of each of the X coordinate value and the Y coordinate value from the extracted coordinate values.

Then, in the newly set range, a graph display graph in which all the function graphs to be combined are drawn is displayed on the display section 230 as shown in FIG. 14D, for example.

FIG. 14D is a diagram showing an example of the graph display screen. According to the figure, a total of three function graphs of function graphs f1, f4, and f5 among the five function graphs f1 to f5 transmitted from the scientific calculators A to C are displayed.

Further, this range is the transmission range (−10 ≦ x) corresponding to the function graph f1 shown in FIG.
≦ 10, −6 ≦ y ≦ 6), the transmission range (−10 ≦ x ≦ 10, corresponding to the function graph f4 shown in FIG. 14B).
-6 ≦ y ≦ 6) and the transmission range (−6 ≦ x ≦ 6, −6 ≦ y corresponding to the function graph f5 shown in FIG. 14C).
It is set to include all three transmission ranges of ≦ 6).

That is, in step S60, the CPU2
10 is a graph data table 251c of the RAM 250
The graph data whose composite display flag is “ON” is read out in sequence, and the function graph corresponding to the function formula data included in the read graph data is drawn (superposed) in a superimposed manner. A graph display screen such as 14 (d) is displayed on the display unit 230.

In this way, when the function graph selected as the synthesis target is synthesized and displayed, the CPU 210 ends this graph synthesis display processing.

As described above, in the graph display control system 20 according to the third embodiment, the scientific calculator 100 is used.
Transmits the data of the function graph in the designated transmission range to the PC 200. Then, the PC 200 superimposes and displays some selected function graphs among the data relating to the plurality of function graphs transmitted from each scientific calculator 100.

Therefore, in order to display a plurality of graphs on the PC 200, the work of enlarging / reducing each graph is not necessary, and even if the graph is enlarged, a jaggy does not occur, and an easy-to-see graph can be obtained.

[Modification] The application of the present invention is not limited to the above-mentioned three embodiments, and can be appropriately changed without departing from the spirit of the present invention.

For example, the graph display control system 10 in the second embodiment is composed of a plurality of scientific calculators 100 and a PC 200 as shown in FIG. 12, and the PC 200 is a plurality of scientific calculators. The function graphs transmitted from the respective 100 may be sequentially displayed.

Further, the graph display control system 20 according to the third embodiment is composed of one scientific calculator 100 and a PC 200 as shown in FIG.
200 may combine and display the data of the function graph sequentially transmitted from this one scientific calculator 100.

In addition, in the first to third embodiments, the graph display control system is constituted by a combination of a scientific calculator as a graph display control device and a PC as the graph display control device. As described above, all functional calculators may be configured, OHPs (Overhead Projectors) may be configured instead of PCs, and all functional calculators may be configured as PCs. Any graph display control device may be used as long as it is a graph display control device having a graph drawing function.

[0143]

According to the present invention, among the graphs currently displayed on the display unit, the coordinate data corresponding to the graph portion in the range designated by the user and the graph in the designated range are dealt with. Send function formula data and other devices,
The data related to the graph can be received as coordinate data and functional expression data on the receiving side instead of the bitmap data as in the conventional case. Therefore, it is possible to display an easy-to-see graph without being affected by the difference between the display screen density of the transmission side device and the display screen density of the reception side device.

Since the data to be transmitted and received are the coordinate data and the functional expression data,
It is possible to perform an arithmetic process such as calculating an intersection between the received graph and another graph or obtaining an area.

Further, when it is desired to enlarge / reduce the received graph in the device on the receiving side, the display coordinates are changed according to the magnification, and the graph based on the function formula data is drawn again with the changed display coordinates. Thus, the graph of the desired portion can be easily obtained. Also in this case, since the display screen density of the device on the transmission side is not affected, problems such as jaggies in the graph do not occur, and an easy-to-see graph can be displayed.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a graph display control system.

FIG. 2 is a block diagram showing an internal configuration of a scientific calculator.

FIG. 3 is a diagram showing a configuration of a transmission data memory.

FIG. 4 is a block diagram showing an internal configuration of a PC.

FIG. 5 is a diagram showing a configuration of a reception data memory.

FIG. 6 is a diagram showing a display screen example of a scientific calculator and a PC according to the first embodiment.

FIG. 7 is a flowchart illustrating a graph transmission process according to the first embodiment.

FIG. 8 is a flowchart illustrating a graph reception process according to the first embodiment.

FIG. 9 is a diagram showing a display screen of a scientific calculator and a PC according to the second embodiment.

FIG. 10 is a flowchart illustrating a graph transmission process according to the second embodiment.

FIG. 11 is a flowchart illustrating a graph reception process according to the second embodiment.

FIG. 12 is a diagram showing a schematic configuration of a graph display control system according to a third embodiment.

FIG. 13 is a diagram showing a configuration of a graph data table.

FIG. 14 is a scientific calculator and a PC according to the third embodiment.
It is a figure which shows the example of a display screen.

FIG. 15 is a flowchart illustrating a graph synthesis display process according to the third embodiment.

[Explanation of symbols]

10, 20 Graph display control system 100 scientific calculator 110 CPU 120 input section 130 display 140 Communication control unit 150 RAM 151 Transmission data memory 151a Transmission range data memory 151b Function formula data memory 160 ROM 161 Graph transmission program 170 external storage 180 system bus 200 PC (personal computer) 210 CPU 220 Input section 230 display 240 Communication control unit 250 RAM 251 Received data memory 251a Transmission range data memory 251b Functional data memory 251c Graph data table 260 ROM 261 Graph reception program 270 external storage 280 system bus N communication line

Claims (7)

[Claims] 1. A graph display control device for displaying a graph on a display unit based on given functional expression data, wherein a display portion of the graph displayed on the display unit, which is a transmission target to another device. And a transmission unit for transmitting the coordinate data corresponding to the range designated by the range designation unit and the functional expression data to the other device. Graph display controller. 2. A graph control device for displaying a graph on a display unit based on given functional formula data, receiving means for receiving coordinate data and functional formula data transmitted from another device, and this receiving means. Display control means for displaying a graph based on the functional expression data with the coordinate data received according to the new display coordinates as a new display coordinate, and a graph display control device. 3. The receiving means receives a plurality of coordinate data and functional expression data corresponding to each coordinate data, and selects a target function from the plurality of functional expression data received by the receiving means. The display control means further comprises selection means for selecting formula data, and the display control means generates new display coordinates from coordinate data corresponding to the function formula data selected by the selection means, and a graph based on the selected function formula data. Is displayed at the new display coordinates.
The described graph display control device. 4. The receiving means receives a plurality of coordinate data and functional expression data corresponding to each coordinate data, and the display control means converts the plurality of functional expression data received by the receiving means. 3. The graph display control device according to claim 2, wherein the corresponding graphs are displayed in an overlapping manner. 5. A graph display control system comprising a data transmitting device and a data receiving device, wherein the data transmitting device includes graph display control means for displaying a graph on a display unit based on given functional formula data. Of the graph displayed on the display unit, a range designating unit for designating a range of a display portion to be transmitted to the data receiving device, and coordinate data corresponding to the range designated by the range designating unit, And a transmission unit configured to transmit the functional formula data to the data reception device, wherein the data reception device receives the coordinate data and the functional formula data transmitted from the transmission unit of the data transmission device. And a graph for displaying a graph based on the functional expression data with the coordinate data received by the receiving means as new coordinate data. A graph display control system comprising: a display control means. 6. A computer, which displays a graph on a display unit based on given functional expression data, sets a range of a display part to be transmitted to another device in the graph displayed on the display unit. A graph display control program for realizing a specified function and a function of transmitting coordinate data corresponding to the specified range and the functional expression data to the other device. 7. A function of receiving coordinate data and functional formula data transmitted from another device to a computer that displays a graph on a display unit based on given functional formula data, and a function of receiving the received coordinate data. A graph display control program for realizing a function of displaying a graph based on the received functional expression data as new display coordinates.