JP3018324B2 - Graph display device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graph display device for displaying a graph on a display unit by inputting function formula data and range data. 2. Description of the Related Art In recent years, small electronic calculators having a graph display function of displaying a graph on a display unit by inputting function formula data and range data have been commercialized. If you want to enlarge or reduce the displayed graph in this kind of small electronic calculator, you need to enlarge it.
Or with manipulating reduction specified key, specifying the two diagonal points of the enlarged or reduced <br/> want part pointer, or expansion
Newly input range data of the portion to be large or reduced, or such as specifying the center coordinates of performing enlargement or reduction ratio and enlargement or reduction, enlargement or contraction by a variety of methods
Small display was performed. [0003] However, the above expansion
In any of the methods for performing reduction or enlargement , a pointer key operation for designating two points, a numerical key operation for newly inputting range data, an enlargement or reduction ratio, and a center coordinate for performing enlargement or reduction are designated. Numeric key operation, etc.
Is an operation each is complicated, troublesome thing der Rubakari
Or, specify the range by specifying two points, so the graph being displayed
Of which, it takes time to identify the range
Consuming, was Tsu cry is easy. The present invention has been made in view of the above-mentioned circumstances, and allows a graph displayed on a display unit to be quickly and easily designated by a simple operation to specify a range to be enlarged or reduced.
And to provide a graph display apparatus which can Nau. According to the present invention, a function storage means for storing function data and a range for displaying a graph of the function data stored in the function storage means are set. Display range storage means for storing the minimum value and the maximum value for each of the X-axis direction and the Y-axis direction, and changing the value of X from the minimum value stored in the display range storage means to the maximum value. Calculating means for sequentially calculating the value of Y by substituting into the function formula data stored in the formula storage means; and the minimum value and maximum value for each of the X-axis direction and the Y-axis direction stored in the display range storage means. A graph is created by setting the minimum coordinate value and the maximum coordinate value in the X-axis direction and the Y-axis direction, respectively, and using the X and Y values obtained by the arithmetic means as (X, Y) coordinate points. Means and the graphing means Display means for displaying a graph created Te, the grayed
Enlarging or reducing the graph created by the rough creation means
Instruction means for instructing the graph, and the instruction means
After enlargement or the reduction is instructed, on the graph screen displayed by the display means, and a coordinate input means for inputting coordinates indicating the range to be enlarged or reduced in the graph are inputted by the coordinate <br/> input means Detecting means for detecting a minimum value and a maximum value for each of the X-axis direction and the Y-axis direction in the range indicated by the coordinates , and a minimum value and a maximum value for each of the X-axis direction and the Y-axis direction detected by the detecting means. and resetting means for resetting to the display range storage means as each of the values corresponding to the new X-axis direction, the minimum and maximum values and the new display range of each Y-axis direction, the
Characterized in that the new display range is reset to anda graph control means for controlling the creation of the enlarged or reduced graph by operating the operation means and the graph generator by resetting means. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the circuit configuration, and reference numeral 11 denotes a key input unit. The key input unit 11 includes a numeric keypad 11a for inputting numerical data, a function key 11b for specifying operation contents, a function key 11c for inputting function data, and a graph (Graph) for specifying a function input for displaying a graph.
A key 11d, a trace (Trace) key 11e for specifying a trace on the graph line by the pointer, a "←" key 11f for specifying a leftward movement of the pointer, and a "→" key for specifying a rightward movement of the pointer A key 11g, an execution key (shown as "EXE" in the figure) 11h for specifying execution of graph display, and an enlargement key 11 for specifying enlargement of the display graph
i, a reduction key 11j for designating reduction of a display graph is provided. When these keys are operated, a key operation signal is sent to the control unit 12. The control unit 12 performs control operations of other circuits in accordance with a key operation signal from the key input unit 11, and stores a graph display buffer for storing graph display data.
13. A text display buffer that stores display data for displaying the coordinate data of the graph display pointer in text
14. Pointer control unit that controls pointer display
15, while transmitting control data to each of a memory unit 17 including an execution pointer 16 for instructing calculation execution for performing graph and pointer display, and a RAM, etc.
A control signal is sent to the tablet control unit 18. The tablet control section 18 applies a drive voltage to a tablet input section 20 provided integrally on the display section 19 according to a control signal from the control section 12. The tablet input unit 20 is configured by a transparent member described later,
When the user presses the transparent member with a finger or a pen or the like, voltage data corresponding to the operated position is sent to the A / D converter 21. The A / D converter 21 converts the received analog voltage data into a digital value, and converts the converted voltage data into digital data designated by the operation of the tablet input unit 20 to the memory unit 17 via the arithmetic unit 22. Send out. The memory unit 17 stores various data related to graph display, a graph expression storage unit 17a for storing a function expression to be displayed in a graph, and an X for storing range data.
max register 17b, Xmin register 17c, Ymax
A register 17d, a Ymin register 17e, and a designated range of the tablet input unit 20, that is, X that stores data necessary for calculating a new range when performing enlargement / reduction.
'Max register 17f, X' min register 17g, Y '
A max register 17h and a Y'min register 17i are provided, and input / output data to / from the operation unit 22 in accordance with a control command from the control unit 12. In addition to the memory unit 17, the arithmetic unit 22 inputs and outputs data to and from a pointer control unit 15 and a mathematical expression buffer 23 for storing function expression data in accordance with the instruction of the execution pointer 16. An operation for changing the range and displaying the pointer and its coordinate data is performed, and the operation result is output to the graph display buffer 13 and the text display buffer. The graph display buffer 13 and the text display buffer 14 store display data according to various data sent from the control unit 12, the operation unit 22, and the pointer control unit 15, and the stored display data is stored. Data is displayed on the display
Sent to 19. The display section 19 is composed of, for example, a dot matrix of 64 dots × 96 dots by a liquid crystal display element, and uses data from the graph display buffer 13 and the text display buffer 14 to store function expressions, graphs, pointers, and pointers. Displays coordinate data and the like. Next, the configuration around the tablet input unit 20 will be described with reference to FIG. In FIG. 1, the tablet input unit 20 includes two ITO (transparent conductive) films 201 and 202 and a spacer (not shown) formed of a gap material or the like between them. The ITO film 201 and the ITO film
202, a constant voltage, for example, 5 V, from the power supply 203 is applied to one of both ends under the control of the tablet control unit 18, and the other end has an end in a direction perpendicular to the direction in which the constant voltage is applied. This state is released, and this state is alternately inverted at a specific timing. When a voltage is applied to the ITO film 201 and one end of the tablet input unit 20 is pressed while one end of the ITO film 202 is open as shown in FIG. Is divided by a resistor, and is taken out as voltage data at the end of the ITO film 202 opposite to the open end. When the voltage data is converted into a digital value by the A / D converter 21, the coordinates of the position on the tablet input unit 20 where the pressing operation is performed can be known. Then, a voltage is applied to the ITO film 202 at the next timing,
The same detection is performed with one end of the
The obtained voltage data is converted into a digital value. The digital value and the digital value form a pair of coordinate data, that is, coordinate data indicating an X coordinate and a Y coordinate.
That is, the designated coordinate position of the display unit 19 can be understood. Next, the operation of the above embodiment will be described. FIG. 3 and FIG. 4 show the operation for enlarging the display graph and the states of the display unit 19 and the tablet input unit 20. First, as shown in FIG.
, And then the "Sin" key of the function keys 11c is operated, and then the execution key 11h is operated. By these key operations, a graph expression storage unit 17a of the memory unit 17 and a mathematical expression buffer from the graph expression storage unit 17a via the calculation unit 22.
In 23, the data of the function formula Y = sinX is stored and set. At the same time, although not shown here, as the range data, for example, "-360" is stored in the Xmin register 17c, and "3" is stored in the Xmax register 17b.
60 ”and“ −1.6 ”in the Ymin register 17e.
Is input to the Ymax register 17d, and the graph-type storage unit 17a of the memory unit 17, Xma
The data stored in the x register 17b, the Xmin register 17c, the Ymax register 17d, and the Ymin register 17e are read out to the arithmetic unit 22. The arithmetic section 22 calculates graph display data based on these data and the dot number data of the dot matrix forming the display section 19, and outputs the obtained data to the graph display buffer 13. Then, based on the graph display data stored in the graph display buffer 13, the display unit 19 performs the graph display of the function formula Y = sinX as shown in FIG. Here, as shown in FIG. 3 (2), when the enlargement key 11i is operated, the control unit 12 judges this key operation, and the enlargement processing shown in FIGS. 5 and 6 is performed. In FIGS. 5 and 6, first, as shown in step A01, it is determined whether or not the key input is made by the enlargement key 11i. If it is determined that the processing is not performed by the enlargement key 11i, another process is performed. However, since the processing is performed by the expansion key 11i, the determination result is YES, and the process proceeds to step A02. In step A02, the X'max registers 17f, X 'of the memory unit 17 are controlled by a control command from the control unit 12.
Min register 17g, Y'max register 17h and Y '
The min register 17i is cleared, and its contents are all "0". Thereafter, in step A03, designation of a new display range is started by a press input of the tablet input unit 20. Here, it is assumed that tablet input as indicated by a broken line is performed on the display unit 19 in FIG. 3 (2). When the tablet input is started, a signal is sent from the control unit 12 to the tablet control unit 18, and the tablet control unit 18 appropriately applies a voltage to the tablet input unit 20 as shown in FIG. Of the coordinate data obtained one after another from the tablet input unit 20, the first obtained coordinate data is set as an initial value in the subsequent step A04. That is, the X coordinate data of the coordinate data is stored in the X'max register 17f and the X'min register 17g.
In addition, the Y coordinate data is stored in the Y'max register 17h and the Y coordinate.
The coordinate data inputted after that is set in the 'min register 17i, and the coordinate data inputted thereafter are subjected to the processing from the next step A05 according to the contents of the X'max registers 17f and X'mi.
n register 17g, Y'max register 17h, Y'min
The input is set in the register 17i. In step A05, the value of the X coordinate data of the new coordinate data is already stored in the X'max register 17f.
Is determined to be greater than the value of the X-coordinate data set in. Here, the value of the new X coordinate data is X'm
If it is determined that the value is larger than the value of the ax register 17f, the process proceeds to step A06, where the new X coordinate data is updated and set in the X'max register 17f. If it is determined that the value of the X-coordinate data is not larger than the value of the X'max register 17f, the process proceeds to step A07, where the new X-coordinate data value is stored in the X'min register. It is determined whether it is smaller than the value of 17 g. Here, the value of the new X coordinate data is displayed on the display unit 19.
If it is determined that the value of the new X coordinate data is smaller than the value of X′mi, the process proceeds to step A08.
Update and set to the n register 17g. If it is determined that the value of the new X coordinate data is not smaller than the value of the X'min register 17g, the process proceeds to step A09. This step A09 is the same as step A
This is performed after the processing of steps 06 and A08 is completed. This time, the value of the Y coordinate data of the new coordinate data is already Y ′
It is determined whether the value is larger than the value of the Y coordinate data set in the max register 17h. Here, the value of the new Y coordinate data is Y'm
If it is determined that the value is larger than the value of the ax register 17h, the process proceeds to step A10, where the new value of the Y coordinate data is updated and set in the Y'max register 17h. Further, the value of the new Y coordinate data is Y'ma
If it is determined that the value is not larger than the value of the x register 17h, the process proceeds to step A11, and it is determined whether or not the value of the new Y coordinate data is smaller than the value of the Y'min register 17i. Here, the value of the new Y coordinate data is Y'mi
If it is determined that the value is smaller than the value of the n register 17i,
Then, the process proceeds to step A12, where the value of the new Y coordinate data is input and set in the Y'min register 17i. Also, the value of the new Y coordinate data is Y'mi
If it is determined that the value is not smaller than the value of the n register 17i, the process proceeds to step A13. This step A13 is performed after the processing of steps A10 and A12 is completed, and determines whether or not the execution key 11h has been operated. Here, if the determination result is NO, the operation from step A05 is repeated again with the new X coordinate data and Y coordinate data input at this timing. Thus, the X'max register 17f and the X'min register by the pressing operation input of the tablet input unit 20
17g, Y'max register 17h, Y'min register 17
When the update of the value of i is set and the range data of the new display range is input, when the execution key 11h is operated next as shown in FIG.
Is transmitted, and the decision result in the step A13 is YES, and the process then proceeds to a step A14. In step A14, step A
X'max register input by processing of 05 to A12
17f, X'min register 17g, Y'max register 17
h and the range data stored in the Y'min register 17i are stored in the Xmax register 17b and the Xmin register, respectively.
17c, transfer setting to the Ymax register 17d and the Ymin register 17e. Subsequently, in step A15, the arithmetic unit 22 operates the Xmax register 17b and Xmi according to the control data of the control unit 12.
Calculation of graph display data based on new range data stored in the n register 17c, Ymax register 17d, Ymin register 17e, function formula data stored in the graph formula storage unit 17a, and dot number data of the dot matrix forming the display unit 19 Is performed, and the display data obtained as a result of the calculation is stored in the graph display buffer 13. In the next step a16, the display data stored in the graph display buffer 13 is used to enlarge the range specified by the tablet input on the display unit 19 as shown in FIG. Perform a graph display. Next, in the state shown in FIG. 3A, instead of the enlargement key 11i, a reduction key as shown in FIG.
When the user operates 11j, the key operation is performed as shown in FIGS.
Are performed. In FIG. 7 and FIG.
As shown in 01, it is determined whether or not the key input is made by the reduction key 11j. If it is determined that the processing is not based on the reduction key 11j, another processing is performed. Here, since the processing is based on the reduction key 11j, the determination result is YE
The result is S, and the process proceeds to step B02. In step B02, the X'max registers 17f, X 'of the memory unit 17 are controlled by the control command from the control unit 12.
Min register 17g, Y'max register 17h and Y '
The min register 17i is cleared, and its contents are all "0". After that, in step B03, designation of a new display range of the currently displayed display screen is started by pressing the tablet input unit 20. Here, it is assumed that tablet input as indicated by a broken line is performed on the display unit 19 in FIG. When the tablet input is started, a signal is sent from the control unit 12 to the tablet control unit 18, and the tablet control unit 18 appropriately applies a voltage to the tablet input unit 20 as shown in FIG. Of the coordinate data obtained one after another from the tablet input unit 20, the first obtained coordinate data is set as an initial value in the following step B04. That is, the X coordinate data of the coordinate data is stored in the X'max register 17f and the X'min register 17g, and the Y coordinate data is stored in the Y'max register 17h and the Y'min register 17g.
The coordinate data which is input and set to i, and thereafter inputted coordinate data is processed according to the contents from the next step B05 to the X'max register 17f, X'min register 17g, Y
The input is set to the 'max register 17h and the Y'min register 17i. In step B05, the value of the X coordinate data among the new coordinate data has already been stored in the X'max register 17f.
Is determined to be greater than the value of the X-coordinate data set in. Here, the value of the new X coordinate data is X'm
If it is determined that the value is larger than the value of the ax register 17f, the process proceeds to step B06, where the new X coordinate data is updated and set in the X'max register 17f. The value of the new X coordinate data is X'ma
If it is determined that the value is not larger than the value of the x register 17f, the process proceeds to step B07, and it is determined whether the value of the new X coordinate data is smaller than the value of the X'min register 17g. Here, the value of the new X coordinate data is X′mi
If it is determined that the value is smaller than the value of the n register 17g,
Subsequently, the process proceeds to step B08, where the value of the new X coordinate data is updated and set in the X'min register 17g. When the value of the new X coordinate data is X'mi
If it is determined that the value is not smaller than the value of the n register 17g, the process proceeds to step B09. This step B09 is also performed after the processing of the above steps B06 and B08 is completed. This time, the value of the Y coordinate data of the new coordinate data is set to the Y coordinate data already set in the Y'max register 17h. It is determined whether it is greater than the value of. Here, the value of the new Y coordinate data is Y'm
If it is determined that the value is larger than the value of the ax register 17h, the process proceeds to step B10, where the new Y coordinate data value is updated and set in the Y'max register 17h. When the value of the new Y coordinate data is Y'ma
If it is determined that the value is not larger than the value of the x register 17h, the process proceeds to step B11, and it is determined whether or not the value of the new Y coordinate data is smaller than the value of the Y'min register 17i. Here, the value of the new Y coordinate data is Y'mi
If it is determined that the value is smaller than the value of the n register 17i,
Subsequently, the process proceeds to step B12, where the value of the new Y coordinate data is input and set to the Y'min register 17i. When the value of the new Y coordinate data is Y'mi
If it is determined that the value is not smaller than the value of the n register 17i, the process proceeds to step B13. This step B13 is performed after the processing of steps B10 and B12 is completed, and determines whether or not the execution key 11h has been operated. Here, if the determination result is NO, the operation from step B05 is repeated again with the new X coordinate data and Y coordinate data input at this timing. Thus, the X'max register 17f and the X'min register by the pressing operation input of the tablet input unit 20
17g, Y'max register 17h, Y'min register 17
When the update setting of the value of i is performed and the range data of the new display range is input, when the execution key 11h is operated next as shown in FIG.
At step B13, and the process goes to step B14. In step B14, the above step B
X'max register input by processing of 05 to B12
17f, X'min register 17g, Y'max register 17
h and new range designation data by tablet input stored in Y'min register 17i and Xmax register
17b, Xmin register 17c, Ymax register 17d,
Based on the current range data stored in the Ymin register 17e, the operation unit 22 calculates the operation Xmax + ((Xmax−X′max) (Xmax−Xmin) / (X′max−X′mi)
n)), Xmin-((X'min-Xmin) (Xmax-Xmin) / (X'max-X'mi
n)), Ymax + ((Ymax-Y'max) (Ymax-Ymin) / (Y'max-Y'mi
n)), Ymin-((Y'min-Ymin) (Ymax-Xmin) / (Y'max-Y'mi
n)), and the operation result is stored in the Xmax register 17b, Xm
in register 17c, Ymax register 17d and Ymin
The input is set to each of the registers 17e. Next, in step B15, the arithmetic unit 22 operates the Xmax register 17b and Xmi according to the control data of the control unit 12.
Calculation of graph display data based on new range data stored in the n register 17c, Ymax register 17d and Ymin register 17e, function formula data stored in the graph formula storage unit 17a, and dot number data of the dot matrix forming the display unit 19. Is performed, and the display data obtained as a result of the calculation is stored in the graph display buffer 13. In the next step B16, a reduced graph is displayed on the display unit 19 in accordance with the display data stored in the graph display buffer 13, as shown in FIG. . As described above, according to the present invention, the use
The graph image displayed on the display means by the user's operation
Enter the trajectory that indicates the range you want to enlarge or reduce the graph
Force to visually increase or decrease the area
Graph display device that can set the area quickly and clearly
Can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a circuit configuration according to an embodiment of the present invention. FIG. 2 is an exemplary view showing a detailed configuration near a tablet input unit according to the embodiment. FIG. 3 is an exemplary view showing a key operation and a state of a display unit corresponding to the key operation according to the embodiment. FIG. 4 is an exemplary view showing a key operation and a state of a display unit corresponding to the key operation according to the embodiment. FIG. 5 is a flowchart showing a process of enlarging a display graph according to the embodiment. FIG. 6 is a flowchart showing a display graph enlarging process according to the embodiment. FIG. 7 is a flowchart showing a display graph reduction process according to the embodiment; FIG. 8 is a flowchart showing a display graph reduction process according to the embodiment. [Explanation of Signs] 11: Key input unit, 11a: Numeric keypad, 11b: Function key, 11c: Function key, 11d: Graph (Graph)
Key, 11e ... Trace key, 11f ...
"←" key, 11g ... "→" key, 11h ... Execute (EXE)
Key, 11i ... enlargement key, 11j ... reduction key, 12 ... control unit,
13 ... Graph display buffer 14 ... Text display buffer, 15 ... Pointer control unit, 16 ...
Execution pointer, 17: memory unit, 17a: graph type storage unit,
17b: Xmax register, 17c: Xmin register, 17
d ... Ymax register, 17e ... Ymin register, 17f
... X'max register, 17g ... X'min register, 17
h ... Y'max register, 17i ... Y'min register,
18: tablet control unit, 19: display unit, 20: tablet input unit, 201, 202: ITO (transparent conductive) film, 203: power supply, 21: A / D conversion unit, 22: arithmetic unit, 23: mathematical expression buffer.

Claims (1)

(57) [Claims] Function expression storage means for storing function expression data; and a minimum value and a maximum value for each of the X-axis direction and the Y-axis direction for setting a range for displaying a graph of the function expression data stored in the function expression storage means. Display range storage means for storing; and changing the value of X from the minimum value stored in the display range storage means to the maximum value, and substituting it into the function formula data stored in the function formula storage means, thereby sequentially storing the Y values. Calculating means for calculating a value; and a minimum coordinate value and a maximum coordinate value for each of the X-axis direction and the Y-axis direction stored in the display range storage means. A graph creating means for creating a graph using the X and Y values obtained by the arithmetic means as (X, Y) coordinate points; and a display means for displaying the graph created by the graph creating means. , This graph creation means Of the graph created by
Is instruction means for instructing reduction, and enlargement or reduction of the graph is instructed by the instruction means.
After the, on the graph screen displayed by the display means, and a coordinate input means for inputting coordinates indicating the range to be enlarged or reduced in the graph, X axis in the range indicated by coordinates input by the coordinate input means direction detecting means for detecting the minimum and maximum values for each Y-axis direction, a new and corresponding detected X-axis direction in the detection unit, to the minimum and maximum values for each Y-axis direction X axial, and resetting means for resetting on the display range storage means and the minimum and maximum values for each Y-axis direction as a new display range, the calculating means and the new display range is reset by the resetting means graph display device being characterized in that includes a graphical control means for controlling the creation of the enlarged or reduced graph by operating the graphing means. 2. It said resetting means, be made of widening modification unit for resetting the detected X-axis direction by the detection means, the minimum and maximum values for each Y-axis direction, to the display range storage means as a new new display range The graph display device according to claim 1, wherein: 3. The coordinate input means is manually operated on the display means.
From the tablet input means to input the trajectory as coordinates
Graph display apparatus according to claim 1, characterized in that.