JP4720607B2 - Graph display device and graph display control program - Google Patents

Description

  The present invention relates to a graph display device and a graph display control program for combining and displaying graph data drawn according to a plurality of function expressions.

  For example, a graph display device that inputs a function expression of Y = f (x) and displays a graph on the X and Y coordinates of a preset range has been put into practical use. In such a graph display device, there is also considered a device having a function of graphing each of a plurality of function expressions and combining and displaying them on X and Y coordinates of a preset range. (For example, refer to Patent Document 1).

On the other hand, each student uses a graph display device (graph function calculator) in a school lesson where a functional expression graph is displayed and analyzed, and the graph display device used by the teacher is equipped with a transmissive liquid crystal display. The OHP graph function calculator capable of OHP display is also used, and the OHP graph function calculator receives graph data from each individual student transferred by infrared communication and displays the graph data in OHP.
JP 07-146947 A

  By applying a graph display device having a function of combining and displaying the plurality of graphs to the OHP graph scientific calculator, it is possible to combine the graph data transferred and received from each student and display them in OHP. However, if it is simply combined and displayed on the X and Y coordinates of the fixed range set in advance, the graph that is displayed including the gaze part such as the characteristic part on the display of each student is the gaze part. It will be displayed as a graph with missing or missing main parts.

  The present invention has been made in view of such a problem, and it is possible to synthesize and display graph data received from a plurality of terminals within an optimal display range so as to include a characteristic portion of each graph. An object of the present invention is to provide a graph display device and a graph display control program.

  The graph display device according to claim 1 is a graph display device that receives graph data displayed on a plurality of terminals, synthesizes and displays the received plurality of graph data, from the plurality of terminals. Graph data receiving means for receiving graph drawing data, graph feature acquisition means for acquiring a characteristic portion of each graph based on a plurality of graph drawing data received by the graph data receiving means, and the graph feature Range setting means for setting a display range so as to include a characteristic portion of each graph acquired by the acquisition means, and a plurality of graph drawing received by the graph data receiving means in the display range set by the range setting means And a graph synthesis display control means for synthesizing and displaying the respective graphs according to the business data.

  The graph display device according to claim 2 is the graph display device according to claim 1, wherein the graph drawing data includes graph-type data, and the characteristic portion of the graph includes a maximum / It includes a minimum value.

  The graph display device according to claim 3, wherein the graph drawing data further includes coordinate data of a graph trace, and the characteristic portion of the graph further includes the graph. It includes the coordinates of the trace.

  The graph display device according to claim 4 is the graph display device according to claim 3, wherein the graph trace according to the graph drawing data on the graph synthesized and displayed by the graph synthesis display control means is displayed. It is further characterized by further comprising pointer display control means for displaying a pointer having a different display form for each receiving terminal of the graph drawing data at a position corresponding to the coordinate data.

  The graph display device according to claim 5 is the graph display device according to any one of claims 1 to 4, wherein the graph composition display control means is a display range set by the range setting means. Each graph according to a plurality of graph drawing data received by the data receiving means is synthesized and displayed in different display colors for each receiving terminal of the graph drawing data.

  6. The graph display device according to claim 6, further comprising display mode setting means for setting a graph display mode in the graph display device according to any one of claims 1 to 5. The composite display control means synthesizes each graph according to a plurality of graph drawing data received by the data receiving means in the display range set by the range setting means, and is set by the display mode setting means The display mode is displayed in the form of a screen.

  According to the graph display device (graph display control program) described in claim 1 of the present invention (graph display control program), based on a plurality of graph drawing data received from a plurality of terminals by the graph data receiving means, The characteristic part of the graph is acquired, and the display range is set so that the characteristic part of each acquired graph is included. And, since each graph according to the received plurality of graph drawing data in the set display range is synthesized and displayed, even if the graph was generated and displayed separately on each terminal, It is possible to display a combined graph with an optimal range setting including all the characteristic portions of the respective graphs.

  According to the graph display device according to claim 2 of the present invention, in the graph display device according to claim 1, the graph drawing data includes graph type data, and the characteristic portion of the graph includes Since the maximum / minimum value of the graph type is included, an optimal graph display can be performed by setting a range in which the maximum / minimum part of each graph is included as a characteristic part.

  According to the graph display device according to claim 3 of the present invention, in the graph display device according to claim 2, the graph drawing data further includes coordinate data of a graph trace, and a characteristic portion of the graph Includes the coordinates of the graph trace, so that the optimum graph display can be performed by setting the range in which the trace coordinates of each graph are further included as a characteristic part.

  According to the graph display device according to claim 4 of the present invention, in the graph display device according to claim 3, each terminal is placed at a position corresponding to the coordinate data of the graph trace on the combined and displayed graph. Since pointers in different display forms are displayed, it is possible to clearly know that the pointers traced on the graph are generated and transferred by separate terminals.

  According to the graph display device according to claim 5 of the present invention, in the graph display device according to any one of claims 1 to 4, each graph according to the plurality of graph drawing data is Since each terminal is synthesized and displayed in a different display color, it can be clearly known that each graph to be synthesized and displayed is generated and transferred by a separate terminal.

  According to the graph display device according to claim 6 of the present invention, in the graph display device according to any one of claims 1 to 5, each graph according to the plurality of graph drawing data is Since it is synthesized and displayed in the screen mode of the display mode set by the display mode setting means, it follows the display mode such as grid display set in this graph display device regardless of the setting display mode on the terminal side. The combined graph can be displayed.

  Therefore, according to the present invention, a graph display device and a graph display control that can combine and display graph data received from a plurality of terminals within an optimal display range so as to include a characteristic portion of each graph. Can provide a program.

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

  FIG. 1 is a block diagram showing a configuration of an electronic circuit of an electronic calculator with an OHP function (OHP graph scientific calculator) 10 according to an embodiment of a graph display device of the present invention.

  FIG. 2 is a diagram showing the contents of each key provided on the keyboard 18 of the electronic calculator (OHP graph scientific calculator) 10.

  FIG. 3 is a diagram showing the contents of the data memory secured in the DRAM 17 of the electronic calculator (OHP graph scientific calculator) 10.

  The electronic calculator (OHP graph scientific calculator) 10 includes a control unit (CPU) 11 that is a computer.

  The control unit (CPU) 11 is a system program stored in advance in the ROM 12 or a computer control program stored in the system area in the ROM 12 from the memory card 13 via the I / O port 14 or the I / O port 14. As a working memory (work memory), the DRAM 17 is downloaded from the Web server (program server) 16 on the communication network N connected via the external PC 15 and stored in the system area in the ROM 12. Controls the operation of each part of the circuit. The system program stored in advance in the ROM 12 and the computer control program read into the system area are activated in response to a key input signal from the keyboard 18.

  The computer control program stored in the ROM 12 includes a display control program for controlling the display operation over the entire operation of the electronic computer 10, and includes numerical values input by keys, Display of symbols, calculation formulas, graph drawing display, calculation result display, cursor (pointer) display / movement display, and the like are controlled.

  In addition to the ROM 12, memory card 13, I / O port 14, DRAM 17, and keyboard 18, the control unit (CPU) 11 is connected to a liquid crystal display unit (LCD) 20 and a transmission type via a liquid crystal driving circuit 19. The OHP liquid crystal display unit 21 is connected.

  Further, the I / O port 14 is connected with a wireless communication unit 22 using an infrared light signal, and with the external device 23a, 23b,. Data transmission / reception is performed.

  As shown in FIG. 2, the keyboard 18 is used to input a function expression or the like to be displayed as a graph, or to specify and input the X-axis and Y-axis coordinate ranges (Xmin, Xmax) (Ymin, Ymax) for graph display. Numerical value / symbol / operator key 18a, “expression” key 18b for setting the graph function expression input state, “mode” key 18c for displaying the display mode setting screen, and graph function expression Each of the graph functions corresponding to a plurality of graph function expressions such as a “graph” key 18d for drawing and displaying a corresponding graph, a graph function expression input in the computer 10 and a graph function expression transferred from the external devices 23a, 23b,. The “composite” key 18e for setting the optimal coordinate range for the graph and displaying it in a composite drawing, and moving the pointer P on the displayed graph to display the graph. "Trace" key 18f for setting to graph trace mode for analyzing and displaying X and Y coordinates, "EXE" key 18g operated when confirming selected data and instructing execution of processing, on display screen A cursor key 18h for performing a cursor (pointer) movement operation, a data selection operation, and the like are provided.

  In the DRAM 17, as shown in FIG. 3, an equation data memory 17a for storing a plurality of graph function equations Y1, Y2,... Inputted or transferred, and each graph function equation stored in the equation data memory 17a. Y1, Y2,... Maximum / minimum value data memory 17b for storing respective local maximum values and local minimum values, coordinate range specified by user input, or optimum setting for composite drawing display of each graph corresponding to a plurality of graph function expressions The range data memory 17d in which the coordinate ranges (Xmin, Xmax) (Ymin, Ymax) are stored, the trace pointers P1, P2,... That are moved and displayed on the displayed graph, the respective current coordinate positions (X, Y ) Stored in the trace point data memory 17e, each graph function expression Y stored in the expression data memory 17a , Y2, ... graph drawing data memory 17f which is a graph corresponding to each stored is drawn, a display mode memory 17g which display modes such as the grid display is stored is set is provided.

  It should be noted that a plurality of graph function formulas Y1, Y2,... Stored in the formula data memory 17a and trace pointers (coordinates) P1, P2 on each graph Y1, Y2,. ,..., Each graph drawing data Y1, Y2,... Stored in the graph drawing data memory 17f is associated with identification data of the computer that is the input source. That is, for example, when the graph function equation Y1 is input in the computer 10 and the graph function equation Y2 is transferred from the external device 23a, the corresponding graph drawing data Y1, Y2 (17f) are also included. The identification data of the input source is added and stored, and each graph data displayed on the liquid crystal display unit (LCD) 20 and the OHP liquid crystal display unit 21 has a different display form (display color) according to the identification data. Displayed.

  In this embodiment, each of the external devices 23a, 23b,... That can be connected to the electronic calculator with an OHP function (OHP graph function calculator) 10 is a graph having substantially the same graph function function except only the OHP function. A scientific calculator.

  Next, the operation of the electronic calculator with an OHP function (OHP graph scientific calculator) 10 having the above configuration will be described.

  Here, the electronic calculator with an OHP function (OHP graph function calculator) 10 will be described as a master unit used by a teacher, and the external devices (graph function calculators) 23a, 23b,... Will be described as terminal devices used by students.

  FIG. 4 is a flowchart showing graph display processing with external devices (terminals) 23a, 23b,... Having the OHP function-equipped electronic computer (OHP graph scientific calculator) 10 as a parent device. (A) is a flowchart showing the base unit process, and (B) is a flowchart showing the terminal process.

  FIG. 5 is a flowchart showing graph operation processing accompanying graph display processing with external devices (terminal devices) 23a, 23b,... Having the OHP function-equipped electronic computer (OHP graph scientific calculator) 10 as a parent device. It is.

  FIG. 6 shows graph display states associated with graph display processing with external devices (terminal devices) 23a, 23b,... Having the OHP function-equipped electronic computer (OHP graph scientific calculator) 10 as a parent device ( It is a figure which shows the 1).

In the base unit 10, for example, as shown in FIG. 6 (M1), two graph function formulas [Y1 = X ³ + X ² -5X] [Y2 = X + 1] are input as graph drawing data (FIG. 6 ( MF)) and stored in the formula data memory 17a, and the range data is input (see (MR1) in FIG. 6) and stored in the range data memory 17d, and a graph drawing display is instructed by the “graph” key 18d. Then, graph data in accordance with the input functional expressions Y1 and Y2 and the range data is drawn and generated, as shown in FIG. 6 (MD1), on the liquid crystal display unit (LCD) 20 and the OHP liquid crystal display unit 21. It is displayed and OHP is displayed (step S1).

  Here, when a “send” key (not shown) on the keyboard 18 is operated, as shown in FIGS. 6A to 6C, the graphs stored in the formula data memory 17a and the range data memory 17d. Data for drawing (graph function formulas Y1, Y2 / range data) is transmitted from the wireless communication unit 22 and transferred to the terminals 23a to 23c (step S2).

  When the graph drawing data (graph function equations Y1, Y2 / range data) transferred from the parent device 10 is received in the terminals 23a to 23c, as shown in FIGS. 6 (A1) to (C1), The graph data Y1 and Y2 are drawn and displayed on the display units of the terminals 23a to 23c, and the process proceeds to the graph operation process in FIG. 5 (steps A1 and AB).

  In this graph operation processing (step B 1), graph function expression input / storage and graph drawing execution processing (step B 2 → B 3) according to the user operation, and on the specified graph according to the trace mode setting operation Trace pointer P display and trace coordinate X, Y display processing (step B4 → B5), range data change and graph screen scroll display processing (step B6 → B7) according to the screen scroll operation with the cursor keys, the trace mode In the set state, the movement display of the trace pointer P on the graph in accordance with the movement operation of the trace pointer P by the cursor key and the change display processing of the trace coordinates X and Y associated therewith (steps B8 → B9, B10) ) Is performed.

  Here, the teacher operating the base unit 10 uses the trace function for analyzing the relationship between the graph of the cubic function equation Y1 and the graph of the linear function equation Y2, and for the student of the terminal device 23a, the intersection on the left side is used. When an instruction is given to check the center intersection for the student of the terminal 23b and the right intersection for the student of the terminal 23c, as shown in FIG. In the machine 23a, the movement display processing of the trace pointer Pa is performed by setting the graph trace specifying the graph Y2 of the linear function equation (step B4 → B5), and the pointer Pa which is the intersection on the left side of each graph Y1, Y2 is set. The coordinates [X = -3] [Y = -2] are displayed (step B8 → B9).

  Further, as shown in FIG. 6 (B2), the terminal 23b performs the movement display process of the trace pointer Pb by setting the graph trace (step B4 → B5) specifying the graph Y1 of the cubic function equation, The coordinates [X = −0.2] [Y = 1.032] of the pointer Pb, which is the center intersection of the graphs Y1 and Y2, are displayed (step B8 → B9).

  On the other hand, in the terminal 23c, as shown in FIG. 6 (C1), as shown in FIG. 6 (CR), according to the scroll display of the graph data Y1 and Y2 in response to the screen scroll operation in the [↑] direction. After the range data is changed and set (step B6 → B7), as shown in FIG. 6C2, the trace is set by setting the graph trace (step B4 → B5) specifying the graph Y1 of the cubic function equation. The movement display process of the pointer Pc is performed, and the coordinates [X = 2.1] [Y = 3.171] of the pointer Pc that is the right intersection of the graphs Y1 and Y2 are displayed (step B8 → B9).

  Thus, by the graph trace processing in each student's terminals 23a, 23b, 23c, the trace pointer display Pa [X = -3] [Y = -2] at the left intersection of the graphs Y1, Y2 and the trace at the central intersection In the state where the pointer display Pb [X = −0.2] [Y = 1.032] and the trace pointer display Pc [X = 2.1] [Y = 3.171] at the right-hand intersection are performed, the “ When a “send” key (not shown) is operated, the graph drawing data (graph function expression Y1, Y2 / range data / trace point (stored in the graph display state) for each terminal 23a, 23b, 23c ( (Coordinate) data) is transferred to the parent device 10 (step A2).

  When the base unit 10 receives the graph drawing data (graph function formulas Y1, Y2 / range data / trace point (coordinate) data) transferred from the respective terminals 23a, 23b, 23c (step S3), It is determined whether or not the graph drawing Yn is included in the received graph drawing data (step S4).

When it is determined that the graph function formulas Y1 and Y2 are included (step S4 (Yes)), the maximum / minimum values of the respective graph function formulas Y1 and Y2 are calculated (step S5) and the cubic graph. When it is determined that the maximum / minimum value has been calculated for the functional expression Y1 [Y1 = X ³ + X ² -5X] (step S6 (Yes)), the cubic function expression Y1 [Y1 = X ³ + X ² − It is determined whether or not the maximum / minimum value of 5X] is within the range of the current graph display range (see FIG. 6 (MR1)) stored in the range data memory 17d (step S7).

If it is determined that the local maximum / minimum value of the cubic function equation Y1 [Y1 = X ³ + X ² -5X] is outside the current graph display range (step S7 (No)), By moving or reducing / enlarging the graph display range, as shown in FIG. 6 (MR2), the range data including the maximum / minimum values of the cubic function equation Y1 is corrected (step S8).

  Then, as shown in FIG. 6 (MD2), the graphs of the received graph function equations Y1 and Y2 are drawn and displayed according to the corrected range data (step S9).

  In this case, when the graph function expressions Y1, Y2,... Are received from the respective terminals 23a, 23b,..., The graphs corresponding to the respective graph expressions Y1, Y2,. , 23b,... Are identified and displayed in different display colors, and are displayed in a screen form such as a grid display stored and set in the display mode memory 17g (step S9).

  In the case of the graph function expressions Y1 and Y2 received from the terminals 23a and 23b described with reference to FIG. 6 (M2), the expression data memory is originally used as the graph function expressions Y1 and Y2 in the base unit 10. 17a, and the graph function equations Y1 and Y2 are both received from both terminals 23a and 23b, so that the identification display with different display colors is not performed.

  Then, the trace point (coordinate) data Pa [X = − is added to the graph drawing data (graph function formulas Y1, Y2 / range data / trace point (coordinate) data) transferred and received from the terminals 23a, 23b, and 23c. 3] If it is determined that [Y = -2], Pb [X = -0.2] [Y = 1.032], and Pc [X = 2.1] [Y = 3.171] are included (step S10 (Yes)) Then, it is determined whether or not each trace point (coordinate) data Pa, Pb, Pc is within the range of the current graph display range stored in the range data memory 17d (step S11), and is determined to be out of the range. If it is determined (step S11 (No)), the range data stored in the range data memory 17d is not only the maximum / minimum value of the cubic graph function expression Y1, but also the respective trace point (coordinate) data. Pa, Pb, and Pc are also included as feature points It is modified set to range data (see FIG. 6 (MR2)) (step S12).

  Then, as shown in FIG. 6 (MD2), the trace point (coordinate) data Pa [X = -3] [Y = -2], Pb [X = -0.2] [Y = 1.032], Pc [X = 2.1] [Y = 3.171] The trace pointers Pa, Pb, and Pc corresponding to the data transfer source terminals 23a, 23b, and 23c are displayed in black, white, and diagonal lines, respectively. The coordinate values corresponding to the pointers Pa, Pb, and Pc are also identified and displayed in blue, red, and green display forms (step S13).

  Thus, the graph drawing data (graph function formulas Y1, Y2 / range data / trace point (coordinate) data) transferred and received from the respective terminals 23a, 23b, 23c on the student side to the parent device 10 side. Are also corrected to optimum range data in which trace points (coordinates) corresponding to local maximum / minimum values and intersections of the graph function equations Y1 and Y2 are included as feature points, and the graph data Y1 and Y2 and the trace pointers Pa , Pb, Pc and the respective trace coordinates [Xa, Ya] [Xb, Yb] [Xc, Yc] are synthesized and displayed in OHP.

  Therefore, not only the feature points of each graph data Y1, Y2,..., But also all the trace pointers Pa, Pb,... As the feature points designated and displayed by the original operation at each terminal 23a, 23b,. OHP can be displayed as the included graph drawing data.

  In the terminals 23a, 23b,..., Every time a change is made to the graph drawing data by the graph operation processing (step AB), the data is transmitted and transferred to the parent device 10 (step A2). On the side, the movement operation state of the trace pointers Pa, Pb,... By the respective terminals 23a, 23b,... Held by the student is drawn in real time and displayed in OHP (steps S3 to S13, SB → S3). .

  In the meantime, the base unit 10 also shifts to the graph operation process in FIG. 5 (step SB), and responds to the user operation on the composite-displayed graph drawing data (see, for example, FIG. 6 (M2)) ( Step B1), graph function expression input / storage and graph drawing execution processing (step B2 → B3), display of the trace pointer P on the specified graph according to the trace mode setting operation, and the trace coordinates X, Y Display processing (step B4 → B5), change of range data according to screen scroll operation by cursor key and graph screen scroll display processing (step B6 → B7), movement of trace pointer P by cursor key in setting state of trace mode Display of movement of the trace pointer P on the graph according to the operation in the designated direction, and Trace coordinates X accompanies les, such as changing the display processing of Y (step B8 → B9, B10) are independently performed.

  FIG. 7 is a diagram showing a graph display state (part 2) accompanying the graph display process with the external device (terminal) 23a having the electronic calculator with OHP function (OHP graph scientific calculator) 10 as a parent device. It is.

  For example, as shown in FIG. 7A, a graph function expression [Y1 = sin2X + cosX] is input according to a graph operation process (step AB: see FIG. 5) in a student's terminal 23a, and FIG. When the graph data Y1 is displayed (steps B1 to B3) as shown in FIG. 7B1 according to the range data set as shown in B2), the graph drawing data is sent to the base unit 10. When the transmission is transferred (step A2) and received (step S3), the base unit 10 calculates the maximum / minimum value of the received graph function expression [Y1 = sin2X + cosX], and FIG. 7 (C2) As shown in FIG. 7, it is corrected to the range data including this, and is displayed on the OHP liquid crystal display unit 21 as shown in FIG. 7 (C1) (steps S4 to S9).

  At this time, the range data of the base unit 10 includes not only the maximum / minimum value of the received graph function expression [Y1 = sin2X + cosX], but also includes the maximum / minimum value and the maximum range. Since the data is corrected and displayed in the graph drawing, even the graph drawing data generated and transferred by the student terminal 23a is automatically set to the optimum register data for making the graph data easier to see. OHP is displayed.

  FIG. 8 is a diagram showing a graph display state (part 3) accompanying the graph display processing with the external device (terminal) 23a having the electronic calculator with OHP function (OHP graph scientific calculator) 10 as a parent device. It is.

For example, as shown in FIG. 8A, a graph function expression [Y1 = X ³ + 2X ² -5X] [Y2 = in accordance with a graph operation process (step AB: see FIG. 5) in a student's terminal 23a. X + 1] is input, and the display mode data of [Grid: off] set as shown in FIG. 8B2 and the range data set as shown in FIG. As shown in B1), when the graph data Y1 and Y2 are displayed (steps B1 to B3), the graph drawing data is transmitted and transferred to the base unit 10 (step A2) and received (step A2). S3) In the parent device 10, the maximum / minimum value of the received graph function expression [Y1 = X ³ + 2X ² -5X] is calculated and set as shown in FIG. 8C2 [Grid: on] display mode data and modified as shown in FIG. 8 (C3) According range data includes serial calculated maximum / minimum value, as shown in FIG. 8 (C1), it is displayed with the grid displayed on the OHP liquid crystal display unit 21 (step S4 to S9).

  At this time, even if the display mode of the student terminal 23a is [Grid: off], the graph data transferred and received from the terminal 23a according to the display mode [Grid: on] set in the parent device 10 is displayed. Easy-to-see OHP display is performed.

  FIG. 9 is a diagram showing a graph display state (part 4) accompanying a graph display process with an external device (terminal) 23a having the electronic calculator with an OHP function (OHP graph scientific calculator) 10 as a parent device. It is.

For example, as shown in FIG. 9A1, a graph function expression [Y1 = X ² −1] is input in response to a graph operation process (step AB: see FIG. 5) in a student's terminal 23a. According to the range data set as shown in (A2), the graph data Y1 is displayed (steps B1 to B3) as shown in FIG. 9B (step B1 to B3). C), when graph data Y2 different from the terminal 23a side is generated and displayed (step S1), the graph drawing data (Y1) generated and displayed by the terminal 23a is displayed. When transmitted and transferred to the base unit 10 (step A2) and received (step S3), in the base unit 10, the received graph function formula [Y1] and the graph function formula [Y2] already drawn and displayed are displayed. The maximum / minimum value is calculated and this is The range data is corrected and displayed on the OHP liquid crystal display unit 21 as shown in FIG. 9D (steps S4 to S9).

  At this time, the original graph data Y2 is identified by the solid black color and the graph data Y1 transferred and received from the terminal device 23a is identified and displayed by the dotted red color on the OHP liquid crystal display unit 21 of the base unit 10. The difference between the graph data Y1 and Y2 can be made easier to see and OHP can be displayed.

  Therefore, according to the electronic calculator with an OHP function (OHP graph scientific calculator) 10 having the above-described configuration, the graph drawing data (graph function formula Y1, Y1) transferred and received from a plurality of external devices (terminals) 23a, 23b,. .., Range data / trace point (coordinates) data Pa, Pb,...), The maximum / minimum values of the respective graph function expressions Y1, Y2,. Range data including all the maximum / minimum values of Y2,... And the trace point (coordinate) data Pa, Pb,... As its characteristic parts are set, and the graph data Y1, Y2,. ,... Are combined and displayed in OHP, so that the graph data Y1, Y2,... Generated and displayed separately by each external device (terminal) 23a, 23b,. It can also be carried out their respective graph data Y1, Y2, ... the OHP display synthesized in the optimal range setting, including all features moieties.

  Therefore, for example, in the case of a class of graph functions in which each external device (terminal) 23a, 23b,... Is a student and this OHP graph scientific calculator (master unit) 10 is a teacher, the graph function is very easy to understand. Analysis display can be performed.

  In addition, according to the electronic calculator with an OHP function (OHP graph scientific calculator) 10 having the above-described configuration, graph drawing data (graph function formula Y1, Y1) transferred from a plurality of external devices (terminals) 23a, 23b,. .., / Range data / trace point (coordinates) data Pa, Pb,...) And graph data Y1, Y2,. Regardless of the setting display mode of each external device (terminal) 23a, 23b,..., A composite graph is displayed according to a display mode such as a grid display set in the OHP graph scientific calculator 10 which is the parent device. be able to.

  Further, according to the electronic calculator with an OHP function (OHP graph scientific calculator) 10 having the above configuration, each graph data Y1, Y2 received and synthesized from the plurality of external devices (terminals) 23a, 23b,. ,... Are displayed in a composite graph in a different display color for each of the terminals 23a, 23b,... Being the reception source, and the trace pointers Pa, Pb,... Are also different for each terminal 23a, 23b,. Since the composite identification display is performed in the display color or pattern, the compositely displayed graphs Y1, Y2,... And the pointers Pa, Pb,... Are generated and transferred by separate terminals 23a, 23b,. Can know clearly.

  In addition, each processing method by the electronic calculator (OHP graph scientific calculator) 10 described in the above embodiment, that is, a graph display between the external devices (terminals) 23a, 23b,... Shown in the flowchart of FIG. As a program that can be executed by a computer, each method such as processing, graph operation processing accompanying graph display processing with the external devices (terminals) 23a, 23b,... Shown in the flowchart of FIG. It can be stored and distributed in an external recording medium (13) such as a memory card (ROM card, RAM card, etc.), magnetic disk (floppy disk, hard disk, etc.), optical disk (CD-ROM, DVD, etc.), semiconductor memory, etc. it can. Various computer terminals having an OHP display function (21) and a communication function (22) with external devices (terminals) 23a, 23b,... Store programs stored in the external recording medium (13). By reading into the apparatus (12) and controlling the operation by the read program, the graph synthesis OHP display function described in the above embodiment can be realized, and the same processing as described above can be executed.

  Further, program data for realizing each of the above methods can be transmitted on a communication network (Internet) N as a program code form, and a computer terminal (program server) connected to the communication network (Internet) N It is also possible to obtain the above-mentioned graph synthesis OHP display function by fetching the program data from 16).

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage. Further, the embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment or some constituent features are combined, the problem described in the column of the problem to be solved by the invention can be solved. When the effect described in the column of effect is obtained, a configuration in which this constituent requirement is deleted or combined can be extracted as an invention.

The block diagram which shows the structure of the electronic circuit of the electronic calculator with an OHP function (OHP graph scientific calculator) 10 which concerns on embodiment of the graph display apparatus of this invention. The figure which shows the content of each key with which the keyboard 18 of the said electronic calculator (OHP graph scientific calculator) 10 was equipped. The figure which shows the content of the data memory ensured in DRAM17 of the said electronic calculator (OHP graph scientific calculator) 10. FIG. 6A is a flowchart showing a graph display process with external devices (terminal devices) 23a, 23b,... Having the OHP function-equipped electronic computer (OHP graph scientific calculator) 10 as a parent device. The flowchart which shows the main | base station process, the same figure (B) is the flowchart which shows the terminal process. The flowchart which shows the graph operation process accompanying the graph display process between the external devices (terminal) 23a, 23b, ... which have the said electronic calculator with an OHP function (OHP graph scientific calculator) 10 as a parent machine. Respective graph display states (part 1) associated with graph display processing with external devices (terminal devices) 23a, 23b,... Having the OHP function-equipped electronic computer (OHP graph scientific calculator) 10 as a parent device. FIG. The figure which shows the graph display state (the 2) accompanying the graph display process between the external apparatus (terminal) 23a which uses the said electronic calculator with an OHP function (OHP graph scientific calculator) 10 as a main | base station. The figure which shows the graph display state (the 3) accompanying the graph display process between the external apparatuses (terminal unit) 23a which makes the said electronic calculator with an OHP function (OHP graph scientific calculator) 10 the main unit. The figure which shows the graph display state (the 4) accompanying the graph display process between the external apparatuses (terminal unit) 23a which uses the said electronic calculator with an OHP function (OHP graph scientific calculator) 10 as a main | base station.

Explanation of symbols

10 ... Electronic calculator (graph scientific calculator: master unit for teachers)
11: Control unit (CPU)
12… ROM
13 ... Memory card (external recording medium)
14… I / O port 15… External PC
16: Web server (program server)
17 ... DRAM
17a ... Expression data memory 17b ... Maximum / minimum value data memory 17c ... Intersection data memory 17d ... Range data memory 17e ... Trace point data memory (P1, P2, ...)
17f ... Graph drawing data memory 17g ... Display mode memory 18 ... Keyboard 18a ... Numeric / symbol / operator key 18b ... "Expression" key 18c ... "Mode" key 18d ... "Graph" key 18e ... "Composite" key 18f ... ""Trace" key 18g ... "EXE" key 18h ... Cursor key 19 ... Liquid crystal drive circuit 20 ... Liquid crystal display (LCD)
21 ... OHP liquid crystal display unit 22 ... Wireless communication unit 23a, 23b, ... External device (student terminal)
N ... Communication network (Internet)
Y1, Y2 ... graph data Pa, Pb, Pc ... pointer

Claims (7)

A graph display device that receives graph data displayed on a plurality of terminals, synthesizes and displays the received plurality of graph data,
Graph data receiving means for receiving graph drawing data from the plurality of terminals;
Based on a plurality of graph drawing data received by the graph data receiving means, a graph feature acquisition means for acquiring a characteristic portion of each graph;
Range setting means for setting a display range so as to include a characteristic portion of each graph acquired by the graph feature part acquiring means;
Graph synthesis display control means for synthesizing and displaying each graph according to a plurality of graph drawing data received by the graph data receiving means in the display range set by the range setting means;
A graph display device comprising: The graph drawing data has graph type data,
The characteristic part of the graph includes the maximum / minimum value of the graph expression,
The graph display device according to claim 1. The graph drawing data further includes coordinate data of a graph trace,
The characteristic portion of the graph further includes the coordinates of the graph trace,
The graph display device according to claim 2.   The display is different for each receiving terminal of the graph drawing data at the position corresponding to the coordinate data of the graph trace according to the graph drawing data on the graph displayed by the graph combining display control means. 4. The graph display device according to claim 3, further comprising pointer display control means for displaying the pointer. The graph composition display control unit is configured to display each graph according to a plurality of graph drawing data received by the data receiving unit in the display range set by the range setting unit, and a receiving terminal of the graph drawing data It is synthesized and displayed with different display colors for each.
The graph display device according to any one of claims 1 to 4, wherein the graph display device is characterized. Furthermore, a display mode setting means for setting a graph display mode is provided,
The graph composition display control means synthesizes each graph according to a plurality of graph drawing data received by the data receiving means in the display range set by the range setting means, and is set by the display mode setting means Display the screen in the displayed display mode,
The graph display device according to claim 1, wherein the graph display device is a display device. A graph display control program for controlling a computer of a graph display device that receives graph data displayed on a plurality of terminals, synthesizes the received plurality of graph data and displays it on a display unit,
The computer,
Graph data receiving means for receiving graph drawing data from the plurality of terminals;
Based on a plurality of graph drawing data received by the graph data receiving means, a graph feature acquisition means for acquiring a characteristic portion of each graph;
Range setting means for setting the display range so as to include the characteristic part of each graph acquired by the graph feature part acquiring means,
A graph synthesis display control unit configured to synthesize each graph according to a plurality of graph drawing data received by the graph data receiving unit in the display range set by the range setting unit and display the graph on the display unit;
A computer-readable graph display control program designed to function as a computer.

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