JPS62186346A - Electronic calculator provided with graphic display function - Google Patents

Abstract

PURPOSE:To attain the magnification/reduction by a simple key operation by executing the magnification/reduction at a predetermined magnification based on a coordinate of a pointer when the pointer is displayed on a display screen and based on a center coordinate displayed when not displayed. CONSTITUTION:A pointer display means displaying the pointer on a display section and a key input section 11 commanding magnification/reduction are provided in an electronic calculator provided with a graph display function applying graphic display function applying graphic display onto a display section 21 in inputting a function data and a range data. Further, a range change means changing and setting the range data into a new range data while the display coordinate of the pointer by a specific magnification/reduction rate is taken as the center of coordinate according to the key input means and a display control section 12 applying graphic display in response to the range data set newly by the range change means are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a small electronic calculator having a graph display function for displaying a graph on a display unit by inputting functional formula data and range data.

[Prior art and its problems] In recent years, small electronic calculators have been commercialized that have a graph display function that displays graphs on the display section by inputting functional formula data and range data. In this type of small electronic calculator, if you want to enlarge a part of the displayed graph, operate the enlargement designation key and specify the two diagonal points of the part you want to enlarge with the pointer. Alternatively, enlarged display has been performed using various methods, such as newly inputting range data of the part to be enlarged, or specifying an enlargement magnification and center coordinates for enlargement.

However, all of the above methods of enlarging require pointer specification operations to specify two points, numeric key operations to input new range data, and numeric key operations to specify the enlargement magnification and center coordinates for enlarging. , etc., each operation was complicated and troublesome.

[Object of the invention] This invention was made in view of the above-mentioned circumstances.
To provide a small electronic calculator having a graph display function capable of enlarging/reducing a graph displayed on a display part by 1 il with simple key operations.

[Summary of the Invention] This invention provides that, in response to a key input specifying enlargement/reduction,
If a pointer is displayed on the display screen, the coordinates of this pointer are used as a reference, and when the pointer is not displayed on the display screen, the center coordinates of the displayed coordinates are used as a reference. Magnification at specified magnification/
It is designed to perform reduction.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the circuit configuration thereof, and 11 is a key input section. This key input section 11 includes a numeric keypad 11a1 for inputting numerical data, a function key 11b1 for specifying calculation contents, a function key 110 for inputting function data, a graph key 110 for inputting function data for displaying a graph
h) Key 11d1 Trace (TraCe) key to specify the trace on the graph line by the pointer Key 11e1 "←" key to specify the leftward movement of the pointer (represented as "merge" in the figure) iif, also the rightward direction of the pointer "→" key to specify movement to (represented as "shi" in the figure)
11Q, an execution key (represented as rEXEJ in the figure) 11h for specifying execution of graph display, an enlargement key 111 for specifying enlargement of the displayed graph, and a reduction key 11j for specifying reduction of the displayed graph, and these keys are operated. Then, the key operation signal is sent to the control section 12. This control section 1
2 performs control operations for other circuits in accordance with key operation signals from the key input unit 11, and includes a graph display buffer 13 that stores graph display data, and a graph display buffer 13 that stores function formulas of the display graph and coordinate data of the display pointer as text. It is composed of a text display buffer 14 that stores data to be displayed, a pointer control unit 15 that controls pointer display, an execution pointer 16 that instructs execution of calculations for graph display and pointer display, and RAM. Control data is sent to each of the memory sections 17. This memory unit 17 stores a graph formula storage unit 17a that stores function formulas to be displayed in a graph, an Xm1n register 17b1 that stores maximum and minimum range data of display screen coordinates, an Xmax register 17C1, a Ym+n register 17d, a SYmaX register 17e1, and coordinate data of a pointer. xmem
An o register 17f and a Ymemo register 17g are provided, and data is input/outputted to and from the arithmetic unit 19 according to control commands from the control unit 12. This calculation section 19 includes a memory section 1
7, a pointer control unit 15, the execution pointer 16
A formula buffer that stores function formula data according to instructions? 20
Both input and output data, perform calculations for graph display, range change, and display of pointers and their coordinate data, and output the calculation results to the graph display buffer 13 and text display buffer 14. The graph display buffer 13 and the text display buffer 114 store display data according to various data sent from the control section 12, calculation section 19, and pointer control section 15, and the stored display data is used for display. The information is sent to Department 21. This display section 21 is made of a liquid crystal display element, for example.
It is composed of a dot matrix of 4 x 96 dots horizontally, and displays functional formulas, graphs, pointers, pointer coordinate data, etc. using data from the graph display buffer 13 and text display buffer 14.

Next, the operation of the above embodiment will be explained.

FIG. 2 shows key operations and the corresponding states of the display section 21. First, as shown in 21K (1), the graph key 11d is operated, and then the rsinJ key and rXJ key of the function keys 11c are operated. By operating these keys, the graph storage section 17 of the memory section 17 is
a and the data of the function formula % formula % are stored and set in the formula buffer 20 from the graph formula storage unit 17a via the calculation unit 19. Along with this, the same data stored in the memory section 17 is displayed in the arithmetic section 19 as display data.
Gral)h:Y- is stored in the text display buffer 14 via the
8i nX is now displayed. Although not shown here, xmtn register 1 is used as range data.
r-180J to 7b, )<r to max register 17C
180J and “-1” to Ymin register 17d.
Assume that "1" is input and set in the YmaXL/register 178.

Next, when the execution key 11h is operated to execute a graph display as shown in FIG. As a result, the graph storage section 17a of the memory section 17, the Xm1n register 17b
, xmax register 17C1, Ymin register 17d and YmaXL/register 17e are stored in the arithmetic unit 19.
is read out. The calculation section 19 calculates graph display data using these data and the dot number data of the dot matrix forming the display section 21, and outputs the obtained data to the graph display buffer 13. Then, using the graph display data stored in the graph display buffer 13, a graph of the function formula % formula % is displayed on the display section 21 as shown in 21M(2).

Here, as shown in FIG. 2 (3), the trace key 11
8, the control unit 12 determines this key operation,
Graph display buffer 13, pointer control section 15,
A control command is sent to the execution pointer 1G and the memory section 17. In response to this control command,
The value r-180J of register 17b is read out and a new
At the same time, this [r-180J is input and set to the memo register 17f, and is substituted into rXJ of the formula "y-sinXJ" in the calculation unit 19, and the resulting value of rYJ is "0".
is input and set to the Ymemo register 17g. This x
memo register 17f and 'y' memo register 17
The data stored in g, that is, the pointer coordinate data r-
180J and "0" are read out to the rendering section 19, calculated, and sent to the graph display buffer 13 as display data. The graph display buffer 13 displays the display data from the calculation section 19 as a pointer on the display section 21 according to the control data sent from the pointer control section 15. ), the leftmost point on the graph line is displayed as a blinking pointer. At the same time, for example) <X coordinate data r-180 of the pointer stored in the memo register 17f
J is stored in the text display buffer 14 via the arithmetic unit 19, and sent to the display unit 21, where the text rX--180J is displayed at the bottom of the screen.

Next, as shown in FIG. 2 (4), the "→" key 11g is operated several times in succession. The pointer X stored in the Xmemo register 17f for each operation.

The coordinate data is updated and set, and a calculation is performed using the updated value and the function formula stored in the formula buffer 20, and the result of the calculation is input and set in the ymemo register 7g as the Y coordinate data of the pointer. This XmemO register 7f and Ymemo register 7g
The data stored in the Xmemo register 7f' is sequentially outputted to the calculation section 19, and is calculated and sent as display data to the graph display buffer 13, and the data stored in the Xmemo register 7f' is stored in the text display buffer 14 via the calculation section 19. This is sent to the display unit 21, and text is displayed at the bottom of the screen. In this way, the pointer in the display 8I121 is displayed as if tracing the graph line while moving one dot at a time in the positive direction of the X coordinate, and the X coordinate data of the pointer at that point is displayed at the bottom as needed. For example, text such as rX-60J is displayed.

Note that the Y coordinate data of the pointer stored in the ymemo register 7g at this point is ro, 866J (7 sin 60).

Now, if the enlargement key 11i is operated as shown in FIG. 2(5), the processing shown in FIG. 3 is performed in response to the key operation.

That is, FIG. 3 shows the process of enlarging and displaying a graph using a specific magnification n. In the graph shown in FIG. 2, the specific magnification value is "2". In FIG. 3, first, as shown in step AO1, it is determined whether data is stored in the xmemO register 17f and the ymemo register 17g.

This is to determine whether or not the pointer is displayed on the display unit 21. Here, data r60J is in the XmemO register 17f and data r60J is in the YmemO register 17Q.
Since data ro and 866J are respectively stored in , the determination result is YES and the process proceeds to step AO2. In step AO2, xmin register 17b,
aX register 17C1 Ymin register 17d, Yma
Range data r-1 stored in x register 17e
80J, r180J, "-1", "1", xmemo
Pointer coordinate data “60” and “0.866” stored in register 17f and ymemo register 17CI
J is read out to the calculation section 19. Next, in step AO3, among these read data, the Xm1n register 17
b, XmaX register 17Q X coordinate range data r
-180J, r180J, and Xmemo register 17f
With the X coordinate data "60" of the pointer, the calculation px+ (XmaX - XIin)/2n-60+
(180-(-180)) / (2x2)...
(1) px −(XIIlaX −Xmin) /2 n−
6O-(180-(-180)) / (2x2)
...(2), and the value obtained from each calculation is "150",
r-30J as new X coordinate range data xma
Input settings are made to the x register 17C and the xm t n register 17b. In the following step AO4, this time the Y coordinate range data "-1", "1" of the Ymin register 17d and Ymax register 17e, and the ymemo register +7
By the Y coordinate data rO, 866J of pointer 0, i
li calculation py+ CYmax −Ymin )/2n
-0,866+ (1-(-1) ) / (2X2
)・・・・(3) P'/−(Ylax −Ymln)/2n−0,86
6-(1-<-1) ) / (2X2)・・・・
Perform (4) and obtain the numerical values M, 37J,
ro, 37J as the new Y coordinate range data Ym
Input settings are made to the in register 17d and YmaX register 17e. This completes the setting of new range data, and then proceeds to step AO5, where the graph formula data is stored in the graph formula storage section 17a of the memory section 17, in this case, the function formula
- Read out sinXJ to the calculation unit 19. Next step AO
6, this graphical data and the above step AO3
, AO4 newly adds xmin register 17b, Xmax register 17c, Ymin register 17d and ym
Range data r-3 input to ax register 17e
0J, r150J, ro, 37J, M, 37J and the dot number data forming the dot matrix on the display section 21, the display data of the display graph is calculated, and the result of the calculation is stored in the graph display buffer? Write to 13. Then, in the following step AO7, this graph display buffer 1
The display data stored in No. 3 is sent to the display section 21 by control commands from the control section 12 and the pointer control section 15, and as shown in FIG. 2 (5), the display data stored in FIG.
An enlarged graph centered on the pointer is displayed at a double magnification. Here again, the X coordinate data "60" of the pointer stored in the xmemo register 17f is
Since the data is sent to the text display buffer 14 via , the text rX-60J is displayed at the bottom of the display section 21.

Also, in the state shown in FIG. 2 (4) above, the enlargement key 11i
If the reduction key 11J is operated instead, the process shown in FIG. 4 is performed for that key operation.

That is, FIG. 4 shows the process of reducing the display of a graph using a specific magnification of 1/n, and in the graph shown in FIG. 2, the specific numerical value of the magnification is "1/2". In FIG. 4, first, as shown in step BO1, it is determined whether data is stored in the XmemO register 17f and the Ym8mO register 17Q. This is to determine whether or not the pointer is displayed on the display unit 21. Here, data "60" is stored in the xmemo register 17f.
Since the data ro and 866J are stored in the ymemo register 17G, the judgment result is YES.
Next, proceed to step [302]. In step 802, x
m+n register 17b, XmaX register 17c1Ym
i n register 17d Range data stored in SYmax register 17e r-180J, N80J, r
-1J, rlJ, xmemo register 17f, Yme
The pointer coordinate data “60”, rO, 866J stored in the mo register 17g is read out to the calculation unit 19. Next, in step 803, among these read data, the Xm1n register 17b and the XmaX register 17
Range data of X coordinate of c r-180J, rl 80J
, the calculation Px + (Xmax −Xm
in) n/2-60+<180 -<-180
)') x2/2...(5) Px-(Xlax-Xmin) n/2-60-
(180-(-180>)X2/2...(6) The numerical value r420J obtained by each calculation
Set r-300J as new X coordinate range data
max register 17C, Xmin register 17b
Set input to . In the following step BO4, this time Ym
Using the Y coordinate range data "-1" and "1" of the in register 17d and Ymax register 17e, and the pointer Y coordinate data ro and 866J of the ymemo register 17Q, the calculation Py+ (Ylax - Ymin) n/2 is calculated.
-0.866 + (1-(-1)) x2/2...
・(7) Py-(Ymax-Ymin) n/2-0
．． 866 − (1−(−1) ) x22・
・ ・ Perform (8) and obtain the numerical value r2.87J for each calculation.
, r-1, 13J as new Y-coordinate range data in the ymax register 17e.

Set the input to the Ymin register 17d. This completes the setting of the new range data, and then the process proceeds to step B05, where the graph data, in this case the function formula "YmSinX", is read out from the graph formula storage section 17a of the memory section 17 to the calculation section 19. In the following step BOB, this graph data and the above steps BO3 and BO4 are newly added to X.
m1n register 17b, Xmax register 17c, Y
min register 1γd and ymax register 17e
Range data input and set to r-300J, r420J
. And then step 3
At 07, the display data stored in the graph display buffer 13 is sent to the display section 21 by control commands from the control section 12 and pointer control section 15, and as shown in FIG. ) A scaled graph is displayed with the pointer as the center at a magnification of 1x2. Here again, the X coordinate data "60" of the pointer stored in the xmemO register 17f is sent to the text display buffer 14 via the calculation section 19, so the display section 21
The text rX-60J is displayed at the bottom of the screen.

In the above example, when the pointer is displayed on the screen of the display unit 21, the enlarge key 111 or the reduce key 11j is operated to enlarge the coordinates of the pointer / enlarge the pointer as the center point of small /
This is the operation when performing reduction, but when the pointer is not displayed on the screen of the display unit 21, the enlargement key 111 is pressed.
Alternatively, when the reduction key 11j is operated, the graph is enlarged/reduced using the center coordinates of the display screen at that time as the center point of enlargement/reduction. The operation will be explained below.

That is, if the pointer shown in FIG. 2 (2) above is not displayed and the enlargement key 111 is then operated as shown in FIG. 2 (7), the third The process shown in the figure is performed.

In FIG. 3, first, as shown in step AO1,
memo register 17f and ymemo register 179
Determine whether data is stored in the . Here X
Since no data is stored in either the memo register 17f or the YmemO register 17Q, the determination result is No, and the process proceeds to step AO8. In step AO8,
Xm1n register 11b1XmaX register 17c,
Ym t n register 17d1 ymax register 178
Range data stored in r-180J, M80J
, "-1", and "1" are read out to the arithmetic unit 19. Next, in step AO9, among these read data, Xm
1n register 17b%
Xmax −Xmin ) /2 n−(180+
(-180) ) /2 + (180-(-180) ) / (2x2
)・・・・(9) (Xllax +xmin) /2− (X
max −Xm1n ) / 2 n−(180+
(-180) ) /2- (180-(-1
80) ) / (2x2)・・・・(10
), and the numbers obtained from each calculation are ``90'' and r
-904 as new X coordinate range data><ma
Input settings are made to the x register 17c and the Xm1n register 17b. In the subsequent step A10, the calculation (Ymax + Ymin) / 2+ (Y
iax −Ymin ) /2 n= (1+
(-1) )/2 +(1-(-1>)/(2x2> ・ ・ ・ (11) (Ymax +Ymin) /2- ('/w
ax −Yllin ) / 2 n=(1+(
-1) )/2 -(1-(-1))/(2x2) ・ ・ ・ (12) The numerical values obtained from each calculation.

"o, 5J, r-0, 5J are input and set as new Y coordinate range data to the ymax register 17e and the Ym + n register 17d. Here, the first term in the above equations (9) and (10) (180+(-180)) /2 or the first term (1+:
(-1) )/2 are both for calculating the coordinate data of the midpoint from the range data. When the setting of the new digital data is completed in this way, the process proceeds to step AO5, and the functional formula data "Yms in) (J", which is the graphical data, is read out from the graphical formula storage section 17a of the memory section 17 to the calculation section 19. .In the following step AO6, this graph data and the above steps AO8 and AO9 are newly added to the xmin register 17b1.
XmaX register 17c, Ymin register 17
Range data r-90J, "90", r-0, 5J, ro, 5J input to d and Ymax register 17e
Based on the dot number data constituting the dot matrix on the display section 21, the display data of the display graph is calculated, and the result of the calculation is written into the graph display buffer 13. Then, in the subsequent step A07, the display data stored in the graph display buffer 13 is sent to the display section 21 according to the control command from the control section 12, and as shown in FIG. A graph is displayed that is enlarged at twice the magnification compared to the current state, centered on the center coordinates of the previous display screen.

Further, when the reduction key 11j is operated instead of the enlargement key 11i in a state where the pointer shown in FIG. 2(2) is not displayed, the processing shown in FIG. 4 is performed in response to the key operation.

In FIG. 4, first, as shown in step BO1>
<memo register 17f and ymemo register 17
Determine whether data is stored in 0. Here, XmemO register 17f, YmemO register 17g
Since no data is stored in either case, the determination result is NO, and the process advances to step 808. In step BO8, Xm1n register 17b1Xmax register 17c,
Yrn i n register 17d, ymax register t
Range data stored in 7e r-180J, r1
80J, "-1", and "1" are read out to the calculation unit 19.

Next, in step BO9, the calculation (X max +
(Xmax −Xmin)n/2− (180+
(-180>') /2+ (180-(-
180) ) X2/2・・・・(13) (X max + X m1n)/2− (XIQ
aX −Xllin) n/2= (180+ (
-180))/2- (180-(-180>)
X2/2・・・(14) The numerical value obtained by each calculation is r360J,
r-360J as the new X coordinate range data
Set the input to the aX register 17c1Xmin register 17b. In the following step B10, this time Ymin
The calculation <Y! 1Iax + Y win) / 2+ (Y
+++ax −Ymin)n / 2− <1 +
(-1') )/2+ (1-(-1) )
x2/2・・・〈15) (Ymax +Ymin)/2 − (Ymax −Ymin)n/2 − N + (−1) )/2− (1−(
-1) ) x2/2・ ・ ・ (16) The numbers obtained from each operation are “2” and “−
2'' is input and set as new Y coordinate range data to the Ymax register 17e and the Ymin register 17d. After setting the new range data in this way,
Next, the process proceeds to step 805, where functional formula data r, which is graph formula data, is stored in the graph formula storage unit 17a of the memory unit 17.
Read Y-8inXJ to the calculation section 19. Next step 8
In 06, this graph data and the above step BO
8,809 newly added ×min register 17bSXmaX
Register 17c1 Ymin register 17d and YmaX
Range data r-360 input to register 17e
J, r360j, "-2", "2" and the dot number data forming the dot matrix of the display section 21, the display data of the display graph is sieved, and the result of the operation is written into the graph display buffer 13. Then, in the following step 807, this graph display buffer? The display data stored in the display unit 13 is displayed on the display unit 2 according to a control command from the control unit 12.
1, and as shown in FIG. 2 (8), the above-mentioned FIG.
A reduced graph is displayed at a magnification of 1/2 compared to the state 2), centered on the center coordinates of the previous display screen.

In the above embodiment, a numerical value specified in advance is used as the magnification/reduction ratio, but this can be done by, for example, counting the key operation time of the enlargement key 111 and the reduction key 11j, and depending on the count value. How to change the magnification, or the enlargement key 111, reduction key 11j
It is also possible to consider a method in which the number of consecutive key operations is counted and the magnification is changed according to the counted value.

[Effects of the Invention] As detailed above, according to the present invention, by simply operating a key for specifying enlargement/reduction, if a pointer is displayed on the display screen, the coordinates of the pointer can be used as a reference. Also, if the pointer is not displayed on the display screen, the center coordinates of the displayed coordinates are used as a reference,
Since the enlargement/reduction is performed at a pre-specified magnification, the graph display function allows you to enlarge/reduce the graph displayed on the display with simple key operations without the need for tedious key operations. It is possible to provide a small electronic calculator with

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a block diagram showing the circuit configuration, FIG. 2 is a diagram showing key operations and the corresponding states of the display section, and FIG. 3 is a diagram showing the enlarged key. FIG. 4 is a flowchart showing the processing contents for the operation of the reduction key. 11...Key input section, 11a...Numeric keypad, 11b
...Function key, 11c...Function key, 1
1d...Graph key, 11e・4-race (TraCe) key, tlf-r 4-J (-
11) Key, 11g-r-)J (Th>-1=-111
h...Execution (EXE) -1=-111i-...Enlargement key, 11j...Reduction key, 12...Control unit, 13.
...Graph display buffer, 14...Text display buffer, 15...Pointer control section, 16...Execution pointer, 17...Memory section, 19...Calculation section, 20.
... Formula buffer, 21... Display section. Applicant's agent Patent attorney Takehiko Suzue Figure 2

Claims (2)

[Claims] (1) In a small electronic calculator equipped with a graph display function that displays a graph on the display section by inputting functional formula data and range data, a pointer display means for displaying a pointer on the display section, and enlargement/reduction. a key input means for instructing; a range changing means for changing and setting the range data to new range data centered on the display coordinates of the pointer according to the key input means; What is claimed is: 1. A small electronic calculator having a graph display function, comprising display control means for displaying a graph according to range data newly set by a range change means. (2) In a small electronic calculator equipped with a graph display function that displays a graph on the display section by inputting functional formula data and range data, a calculation means for calculating the center coordinate data of the display section, and enlargement/reduction. a key input means for instructing; and a range change for changing and setting the range data to new range data centered on the coordinate data calculated by the calculation means using a specific enlargement/reduction ratio according to the key input means; What is claimed is: 1. A small electronic calculator having a graph display function, comprising: means for changing the range; and display control means for displaying a graph according to the range data newly set by the range changing means.