JP2969188B2 - Graph display control device and graph display control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graph display control device.
And a graph display control method .

[0002]

2. Description of the Related Art Heretofore, as a small electronic computer having a graph display function, a computer capable of individually displaying a rectangular coordinate graph, a polar coordinate graph, a parameter graph, and the like has been put to practical use.

Some small electronic calculators having such a graph display function have a graph tracing function of sequentially displaying the trajectory of a displayed graph by blinking and moving and displaying respective coordinate data. .

[0004]

However, the above-mentioned conventional compact electronic computer having a graph display function can individually display different types of graphs such as a rectangular coordinate system and a polar coordinate system. Different types of graphs, in particular, a rectangular coordinate graph and a polar coordinate graph cannot be mixedly displayed on the same screen.

Further, even if the rectangular coordinate graph and the polar coordinate graph can be mixedly displayed, the coordinate determining parameters of the rectangular coordinate graph are (X, Y), and the coordinate determining parameters of the polar coordinate graph are (r, θ) and (r, θ). Since there is no correlation between the coordinate positions, graph tracing in which one graph is associated with the other graph cannot be performed, and there is a problem that it is difficult to analyze intersections, contact points, and the like.

[0006] The present invention has been made in view of the above problems, in particular, when the orthogonal coordinate graph and polar graphs showing tables on the same screen, it is possible to graph traced in association between each graph Graph display control device and graph
It is an object of the present invention to provide a display control method .

[0007]

That SUMMARY OF THE INVENTION, graph display control apparatus according to the present invention is a function expression of the Cartesian coordinate system Y
= F (X) and r = g (θ) which is a function formula of the polar coordinate system.
Function storage means for storing, and storage in the function storage means
A graph for controlling display of graphs respectively corresponding to Y = F (X) which is a function formula of the above-described rectangular coordinate system and r = g (θ) which is a function formula of a polar coordinate system on the same screen. a display control <br/> means Gras displayed by the graph display control unit
A tray <br/> scan means for performing tracing by showing coordinate points on off, and switching Ru switching recombinant means traced graph other graphs by the trace means, the switching means
Switches the graph to be traced to another graph
At this time, the coordinates of the traced graph
Coordinate system parameters corresponding to other graphs based on points
Means for calculating a different coordinate system parameter to be calculated, and the different coordinate system
Increase the value of the parameter obtained by the parameter calculation means
New trace by substituting into function expression of other graph coordinate system
Trace coordinate designation means for designating coordinate points for performing
It is configured.

[0008]

[0009]

[0010]

In other words, when the trace graph is switched at the time of tracing the rectangular coordinate graph, the position indicated by the coordinate parameter (X, Y) is converted into an angle θ with respect to the coordinate origin, and the polar coordinate parameter (r , Θ), and the trace points of the polar graph are obtained. When the trace graph is switched during the tracing of the polar graph, the orthogonal coordinates are obtained based on the X coordinate corresponding to the trace point. By determining the trace points of the graph, it is possible to switch the trace graph in which the trace points are related to each other.

[0011]

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

FIG. 1 shows the configuration of an electronic circuit of a small electronic computer with a graph display function.
Denotes a control unit, and 12 denotes a key input unit. The control unit 11 controls the operation of each part of the circuit in response to a key input operation signal from the key input unit 12.

In addition to the key input unit 12, an expression memory 13, a data memory 14, an arithmetic unit 15, text and graph display buffers 16a and 16b, and a display unit 17 are connected to the control unit 11.

The key input section 12 includes a numeric / character key 12a, a function key 12b, a "Y =" key 12c, and an "r" key.
= ”Key 12d,“ Range ”key 12e,“ Graph ”key 12f,“ Trace ”key 12g,“ → ”key 12
h, "↓" key 12i is provided. The numerical / character keys 12a and the function keys 12b are operated when inputting a function formula for performing a desired graph display, range data for determining a display range of the graph, and the like. Is operated when inputting the function formula "Y = F (X)" of the rectangular coordinate system, and the "r =" key 12d is operated when inputting the function formula "r = g (θ)" of the polar coordinate system. Is done. The "Range" key 12e is operated when setting a range mode for inputting the range data, and the "Graph" key 12f is used when displaying a graph based on each of the above functional expressions on a display screen. Operated.

The "trace" key 12g is operated to trace the locus of the graph displayed on the display screen, and the "→" key 12h is operated to move the trace position. The "↓" key 12i is operated when switching the graph to be traced.

Here, the control section 11 is provided with a flag register 11a. The flag data F of the flag register 11a is set to "2" at the time of graph tracing in the rectangular coordinate system, and the flag data F in the polar coordinate system is set. Set to "1" during trace.

The expression memory 13 stores the “Y =” key 1
Cartesian coordinate code “Y =” selected according to the operation of 2c
And the polar coordinate system function expression storage area 13 corresponding to the polar coordinate code “r =” selected according to the operation of the “r =” key 12d.
b, the function formula data input following the operation of the “Y =” key 12c is stored in the rectangular coordinate system function formula storage area 13a, and the function data is input following the operation of the “r =” key 12d. The input function expression data is stored in the polar coordinate system function expression storage area 13b.

The data memory 14 has a range data register 14a, a rectangular coordinate system register 14b, and a polar coordinate system register 14c.
4a, range data indicating the display range of the graph on the display screen, that is, the minimum and maximum coordinates "Xmin" and "Xmax" at the left and right ends on the X-axis display screen, and the lower end on the Y-axis display screen. And the minimum and maximum coordinates "Ymin" and "Ymax" at the upper end are set and stored by the key input unit 12, respectively.

The orthogonal coordinate system register 14b stores true coordinates X and true coordinates X for the orthogonal coordinate system function formula "Y = F (X)" set according to the range data "Xmin" and "Xmax". Is stored, and the true coordinates Y obtained based on the true coordinates X are stored.

The polar coordinate system register 14c stores a θ value with respect to the polar coordinate system function formula “r = g (θ)”, a predetermined amount update data Δθ of the θ value, and an r value obtained based on the θ value. It is memorized.

Here, the graph of the orthogonal coordinate system is a graph of true coordinate data (X, Y) based on the origins of the X-axis and the Y-axis sequentially calculated based on a given function formula “Y = F (X)”. )
Is converted into display coordinate data (x, y) using the lower left corner as a reference point on the display screen and displayed.

Further, a graph of the polar coordinate system is obtained by sequentially calculating θ values and r values based on a given function expression “r = g (θ)”.
After converting the values into true coordinate data (X, Y) based on the origins of the X axis and the Y axis based on the following equations 1 and 2,
Further, as described above, the image is converted into display coordinate data (x, y) using the lower left corner on the display screen as a reference point and displayed. X = r cos θ Expression 1 Y = r sin θ Expression 2

The arithmetic unit 15 starts arithmetic processing based on the function formula stored in the expression memory 13 and performs coordinate conversion arithmetic processing from the true coordinate data (X, Y) to the display coordinate data (x, y). A data conversion operation from the polar coordinate data (θ, r) to true coordinate data (X, Y);
The arithmetic processing of the angle θ “= tan ⁻¹ (Y / X)” with respect to the coordinate origin of the position indicated by the true coordinate data (X, Y) is performed, and the display coordinate data ( x, y) are plotted in the graph display buffer 16b.

Here, the genuine coordinates X corresponding to each display coordinate x on the dot matrix in the display section 17 are obtained by the following equation 3, and the display coordinates corresponding to the genuine coordinates Y obtained based on the genuine coordinates X are as follows. y is obtained by the following equation (4). X = (Xmax−Xmin) (x−1) / (M−1) + Xmin (3) where M is the number of X-axis dots “96” on the display unit 17.
It is. y = (Y−Ymin) (N−1) / (Ymax−Ymin) +1 Equation 4 where N is the number of Y axis dots “64” on the display unit 17.
It is.

The text and graph display buffer 16
Reference numerals a and 16b each have a memory area corresponding to the number of screen dots in the display unit 17. When display data is written to the text and graph display buffers 16a and 16b, the display data is written to the write position. Display processing is performed on the corresponding dot matrix of the display unit 17. That is, when the display coordinate data (x, y) calculated by the arithmetic unit 15 is plotted in the graph display buffer 16b, the display unit 1 corresponding to the plot position is displayed.
The coordinate display is performed for the two-dimensional coordinates on.

In this case, the coordinate point on the display unit 17 in the plot state by the arithmetic unit 15 is blinked when the graph trace mode is set based on the operation of the "trace" key 12g.

When two or more display coordinate data (x, y) are plotted on the graph display buffer 16b, a graph consisting of coordinate data connecting the previous plot position and the current plot position is obtained. The display data is
The calculation unit 15 presets both in the graph display buffer 16b. The display unit 17 is, for example, 96 × 64
It is configured using a liquid crystal display device of a dot matrix display system of dots. On the other hand, the key input data and the function expression data are written into the text display buffer 16a and displayed on the display unit 17. Next, the graph display operation of the small-sized electronic computer with the graph display function according to the above configuration will be described.

The user inputs “Y” in the key input section 12.
= ”Key 12c, numeric / character key 12a, function key 1
2b, first, a rectangular coordinate system function expression “Y = F
(X) ”, the input function expression“ Y = F
(X) ”is stored in the orthogonal coordinate system function expression storage area 13a corresponding to the orthogonal coordinate code“ Y = ”in the expression memory 13 by the control unit 11.

By operating the "r =" key 12d in the key input section 12, the polar coordinate system function expression "r = g (θ)" is obtained.
Is input, the input function expression “r = g (θ)”
Is calculated by the control unit 11 in the polar coordinate code “r” of the expression memory 13.
= ”Is stored in the polar coordinate system function expression storage area 13b.

To display a graph according to each of the above functions, a range mode is set by operating a "range" key 12e of the key input section 12, and a numerical value / character key 12a is operated to display a graph. Are input as range data Xmin, Xmax, Ymin, and Ymax indicating the display range. This range data Xmin, Xmax, Ymin, Yma
x is stored in the range data register 14a of the data memory 14 by the control unit 11.

That is, when the "graph" key 12f of the key input section 12 is operated to display a graph, first, the orthogonal coordinate code "Y =" set in the expression memory 13 by the control section 11 is read out. The process proceeds to the graph display processing of the orthogonal coordinate system function expression “Y = F (X)”.

Then, the true coordinate X in the orthogonal coordinate system register 14b of the data memory 14 is set to the minimum coordinate Xmin previously set in the range data register 14a, and the arithmetic processing relating to "Y = F (X)" is performed. Part 1
5 is executed. By the calculation unit 15, the above “Y =
When the true coordinate data (X, Y) relating to “F (X)” is obtained, display coordinate data (x, y) corresponding to the true coordinate data (X, Y) is obtained based on the above formulas 3 and 4. Are plotted from the calculation unit 15 into the graph display buffer 16b and displayed on the display unit 17.

Here, the current true coordinate X in the orthogonal coordinate system register 14b is updated according to the predetermined amount update data ΔX, and the arithmetic processing relating to “Y = F (X)” is again performed by the arithmetic unit 15 Be executed.

That is, the ΔX updating process of the true coordinates X and “Y = F based on the updated true coordinates X”
(X) ", and the conversion process from the calculated true coordinate data (X, Y) to the display coordinate data (x, y) are repeated, thereby obtaining the display coordinate range X set in advance.
min, Xmax, a rectangular coordinate system function expression “Y = F
(X) "is displayed.

Thereafter, the display coordinate ranges Xmin, Xma
When the graph display processing of the orthogonal coordinate system function expression “Y = F (X)” corresponding to x is completed, the control unit 11 controls the expression memory 1
The next coordinate system code set to 3 is read.

When the coordinate system code "r =" set next to the rectangular coordinate code "Y =" is read from the expression memory 13, the θ value in the polar coordinate system register 14c of the data memory 14 is initialized to "0". Is set to "r = g
(Θ) ”is executed by the operation unit 15. When the polar coordinate data (r, θ) is obtained by this arithmetic processing, the polar coordinate data (r, θ) is converted into true coordinate data (X, Y) based on the above-described equations (1) and (2).
Then, display coordinate data (x, y) corresponding to the true coordinate data (X, Y) is obtained based on the above formulas 3 and 4, and is plotted in the graph display buffer 16b from the calculation unit 15 and the display unit. 17 is displayed.

Here, the current θ value in the polar coordinate system register 14c is the predetermined amount of update data Δθ (for example, π
/ 10), and the calculation unit 15 executes the calculation process regarding “r = g (θ)” again.

That is, the .DELTA..theta. Update processing of the .theta. Value, the calculation processing of "r = g (.theta.)" Based on the updated .theta. Value, and the true coordinate data (r, .theta.) From the calculated polar coordinate data (r, .theta.). By repeating the conversion processing to X, Y) and further to the display coordinate data (x, y), the polar coordinate system function formula “r = g () corresponding to a preset θ range (0 to 2π) is obtained. θ)) is performed.

Thereafter, in the equation memory 13, if there is no function equation following the orthogonal coordinate system function equation "Y = F (X)" and the polar coordinate system function equation "r = g (θ)", Means that the graphs corresponding to all the function expressions written in the expression memory 13 are displayed on the display unit 17.
FIG. 2 is a diagram showing a display state of the display unit 17 associated with the graph display processing and graph trace processing of the small electronic computer with the graph display function.

FIGS. 3 and 4 are flow charts showing the graph tracing process of the small electronic computer having the graph display function. When the "trace" key 12g on the key input unit 12 is operated to perform the graph tracing, the control is started. The unit 11 reads the coordinate system code of the first equation set in the equation memory 13 and determines whether the orthogonal coordinate code is “Y =” or the polar coordinate code “r =” (Steps S1 and S1).
2).

First, the rectangular coordinate code "Y =" is read from the expression memory 13 of the present embodiment, and the process proceeds to the tracing process for the rectangular coordinate graph. Here, the flag data 11F is stored in the flag register 11a of the control unit 11.
"2" is set (step S3).

Then, the true coordinate X in the orthogonal coordinate system register 14b of the data memory 14 is set to the minimum coordinate Xmin previously set in the range data register 14a, and the orthogonal coordinate system function formula "Y = F (X)" is obtained. The calculation process is executed by the calculation unit 15 (steps S4 and S4).
5).

When the true coordinate data (X, Y) is obtained by the arithmetic processing in step S5, the display coordinate data (x, Y) corresponding to the true coordinate data (X, Y) is obtained based on the equations (3) and (4). , Y) are calculated, plotted from the calculation unit 15 into the graph display buffer 16b, the coordinate points are blinked and displayed on the display unit 17, and the true coordinate data (X, Y) is displayed as characters in the empty area. (Step S6).

Here, when the "→" key 12h of the key input section 12 is operated, the control section 11 determines whether the flag data F of the flag register 11a is "1" or "2", that is, the current trace target graph. Is determined to be a polar coordinate graph or a rectangular coordinate graph (steps S7, S8).

In this case, in step S8, F = 2,
In other words, it is determined that the rectangular coordinate graph is being traced,
The current true coordinate X in the orthogonal coordinate system register 14b is updated in accordance with the predetermined amount update data ΔX, and the arithmetic processing regarding “Y = F (X)” is executed again by the arithmetic unit 15 (step S9). → S5).

That is, by repeating the processing in steps S5 to S9, the orthogonal coordinate system function expression “Y
= F (X) ”, and the trace display processing of the graph locus corresponding to“ = F (X) ”is sequentially performed.

On the other hand, during the trace display processing of the orthogonal coordinate graph in steps S5 to S9, for example, while the coordinate point a1 in FIG. 2 is set as the trace point, the trace point is updated by operating the "→" key 12h. ↓ key 12 to switch the graph to be traced from the rectangular coordinate graph to the polar coordinate graph without performing
By operating i, “No” is determined in step S7, and “Yes” is determined in step S10.
Specifies the coordinate system code of the following equation set in the equation memory 13 (step S11).

That is, the polar coordinate system function expression "r = g (θ)" in the expression memory 13 is specified. Here, the flag data F of the flag register 11a is set to "1" or "2" in the control unit 11. That is, it is determined whether the previous trace target graph is a polar coordinate graph or a rectangular coordinate graph (step S12).

In this case, in step S12, F =
2, that is, it is determined that the rectangular coordinate graph was traced in the previous time, and further, it is determined whether the next functional expression in the expression memory 13 specified in step S11 is a functional expression of an orthogonal coordinate system (step S11). S13).

If "No" is determined in step S13, that is, if the next function specified in step S11 is determined to be a polar coordinate system, the process of tracing the rectangular coordinate graph is shifted to the process of tracing the polar coordinate graph. Transition.

That is, first, the authenticity corresponding to the trace point a1 of the orthogonal coordinate graph at the time of operating the "↓" key 12i corresponding to the judgment of the step S10, that is, at the time of switching the graph to be traced. The coordinates (X, Y) are read from the orthogonal coordinate system register 14b to the arithmetic unit 15, and the angle θ “= tan ⁻¹ (Y / X)” of the trace point a1 with respect to the coordinate origin is calculated (step S14).

Here, the flag data F of the flag register 11a in the control unit 11 is set to "1" indicating that the tracing process of the polar coordinate graph is being performed (step S15).

Then, the origin angle θ corresponding to the trace point a1 of the rectangular coordinate graph calculated by the arithmetic unit 15 is calculated by the polar coordinate system function expression “r = g (θ) in the expression memory 13 specified in step S11. ) "
The calculation process is executed (Step S16).

When the polar coordinate data (r, θ) is obtained by the arithmetic processing in step S16, the above equations (1) and (2) are obtained.
The polar coordinate data (r, θ) is converted to true coordinate data (X, Y) on the basis of (Step S17). And
The display coordinate data (x, y) corresponding to the true coordinate data (X, Y) obtained in step S17 is obtained based on the formulas 3 and 4, and is plotted from the calculation unit 15 into the graph display buffer 16b. At the same time, the coordinate point b1 blinks on the display unit 17, and the polar coordinate data (r, θ) is displayed in characters in the empty area (step S).
18). As a result, the graph to be traced is switched to the trace point b1 of the polar coordinate graph based on the trace point a1 of the orthogonal coordinate graph.

Here, when the "→" key 12h of the key input unit 12 is operated, the control unit 11 determines whether the flag data F of the flag register 11a is "1" or "2", that is, the current trace target graph. Is determined to be a polar coordinate graph or a rectangular coordinate graph (steps S7, S8).

In this case, in step S8, F = 1,
That is, it is determined that the polar coordinate graph is being traced, and the current θ value in the polar coordinate system register 14c is updated in accordance with the predetermined amount update data Δθ.
g (θ) ”is executed by the arithmetic unit 15 (steps S19 → S16).

That is, steps S16 to S18,
By repeating the process execution in S7, S8 → S19,
Trace display processing of the graph locus corresponding to the polar coordinate system function expression “r = g (θ)” is sequentially performed.

On the other hand, steps S16 to S18, S
7, during the trace display processing of the polar coordinate graph from S8 to S19, for example, with the coordinate point b2 in FIG. 2 as a trace point, the trace point is not updated by operating the "→" key 12h, and the trace point is updated. When the "↓" key 12i is operated to switch the target graph from the polar graph to the rectangular coordinate graph, step S
7, “No”, and in step S10, “Ye
s ", and the coordinate system code of the following equation set in the equation memory 13 by the control unit 11 is designated (step S1).
1).

That is, the orthogonal coordinate system function expression “Y = F (X)” in the expression memory 13 is specified.
The control unit 11 determines whether the flag data F of the flag register 11a is "1" or "2", that is, whether the previous trace target graph is a polar coordinate graph or a rectangular coordinate graph (step S12).

In this case, in step S12, F =
1, that is, it is determined that the polar coordinate graph was traced the previous time, and it is further determined whether or not the next function expression in the expression memory 13 specified in step S11 is a function expression in the rectangular coordinate system (step S20). ).

In step S20, "Yes",
That is, when the next function expression specified in step S11 is determined to be in the rectangular coordinate system, the processing shifts from the trace processing of the polar graph to the trace processing of the rectangular coordinate graph.

That is, the polar coordinate data (r) corresponding to the trace point b2 in the polar coordinate graph at the time of operating the "↓" key 12i corresponding to the judgment in the step S10, that is, at the time of performing the switching operation of the graph to be traced. , Θ) from the polar coordinate system register 14c to the arithmetic unit 1
5 and the true coordinate X corresponding to the trace point b2 is calculated based on the above equation (step S2).
1).

Here, the flag data F of the flag register 11a in the control unit 11 is set to "2" indicating that the tracing process of the orthogonal coordinate graph is being performed (step S22).

Then, the true coordinate X corresponding to the trace point b2 of the polar coordinate graph calculated by the arithmetic unit 15 is calculated by the orthogonal coordinate system function expression “Y = F (X ) "
The calculation process is executed (Step S5).

When the genuine coordinate data (X, Y) is obtained by the calculation processing in step S5, the display coordinate data (x, , Y) are obtained and plotted in the graph display buffer 16b from the calculation unit 15, the coordinate point a2 is displayed blinking on the display unit 17, and the true coordinate data (X, Y) is displayed in characters in the empty area. (Step S6). As a result, the graph to be traced has been switched to the trace point a2 of the orthogonal coordinate graph based on the trace point b2 of the polar coordinate graph.

On the other hand, in step S13, "Ye
s ”, that is, when switching from the tracing process of the rectangular coordinate graph to the tracing process of another rectangular coordinate graph, the true coordinate X corresponding to the trace point is directly used as the next rectangular coordinate system function expression“ Y = F ( X) ", a new trace point is obtained in steps S5 and S6.

In step S20, "N
o ”, that is, when switching from the tracing process of the polar graph to the tracing process of another polar graph, the θ value corresponding to the trace point is directly used in the next polar coordinate system function expression“ r = g (θ) ”. By the substitution, a new trace point is obtained in steps S16 to S18.

Further, in step S2, "N
o ", that is, when the coordinate system code of the first expression is the polar coordinate code" r = ", the tracing process for the polar graph is executed first. Here, the flag data 11F is stored in the flag register 11a of the control unit 11.
"1" is set (step S23).

Then, the θ value in the polar coordinate system register 14c of the data memory 14 is set to the initial value “0”, and the arithmetic unit 15 executes the arithmetic processing relating to the polar coordinate system function expression “r = g (θ)”. (Step S24 → S16). Then, similarly to the above, through steps S17 and S18, a trace point for this polar coordinate graph is obtained, and the coordinate point is blinked on the display unit 17.

Therefore, according to the small-sized electronic computer having the graph display function having the above configuration, the rectangular coordinate system function expression “Y =
F (X) ”and a polar coordinate system function expression“ r = g
(Θ) ”can be mixedly displayed on the same screen of the display unit 17, and a graph trace can be performed in which one graph and the other graph are associated at the trace point. , Contacts and the like can be easily analyzed.

[0071] According to the present invention as described above, the graph corresponding to each of the function expression of the functional expression and the polar coordinate system of Cartesian coordinate system are displayed on the same screen, the table indicated one grayed <br With the rough coordinate points shown and graph traced,
When the graph to be traced is switched to another graph ,
Based on the traced coordinate point of the graph to be raced
The parameters of the coordinate system corresponding to the other graphs are calculated.
And the value of this parameter is
Substitute and specify a new trace coordinate point.
The rectangular and polar graphs are displayed on the same screen.
When shown, graph trace is performed by associating each graph.
It becomes possible.

[0072]

[0073]

[0074]

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an electronic circuit of a small electronic computer with a graph display function according to an embodiment of the present invention.

FIG. 2 is a diagram showing a display state of a display unit associated with a graph display process and a graph trace process of the small electronic computer with the graph display function.

FIG. 3 is a first flowchart showing a graph tracing process of the small electronic computer with the graph display function.

FIG. 4 is a second flowchart showing a graph tracing process of the small electronic computer with the graph display function.

[Explanation of symbols]

11: control unit, 11a: flag register, 12: key input unit, 12a: numeric / character key, 12b: function key, 1
2c: "Y =" key, 12d: "r =" key, 12e ...
"Range" key, 12f ... "Graph" key, 12g ...
"Trace" key, 12h ... "→" key, 12i ...
"↓" key, 13: expression memory, 13a: orthogonal coordinate system function expression storage area, 13b: polar coordinate system function expression storage area, 1
4 data memory, 14a range data register, 1
4b: Cartesian coordinate system register, 14c: Polar coordinate system register, 15: Operation unit, 16a: Text display buffer, 1
6b: graph display buffer; 17: display unit.

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification code FI G09G 5/36 G06F 15/72 360 (56) References JP-A-62-66353 (JP, U) Addison-Wesley Publishing Company, Inc. , MathematicalaTM A System for Doing Materials by Computer, (1988) p. 107-120 (58) Fields investigated (Int.Cl. ⁶ , DB name) G06F 15/02 G06F 3/147 G06F 3/153 G06T 11/20 G09G 3/20 G09G 5/36

Claims (2)

(57) [Claims] (1)straightIntersection coordinate functionY = F (X)
as well asPolar coordinate functionIs a function that stores r = g (θ).
Formula storage means, The function expression storage means Cartesian coordinate systemoffunction
formulaY = F (X) andPolar coordinate systemofFunction expressionR =
g (θ)And the graphs corresponding toOn the same screentable
ShowControlgraph displaycontrolMeans and this graph displaycontrolDisplayed by meansSeat on a broken graph
By showing the marktraceDoTrace means
And the graph to be traced by this tracing means
Switch toCut offReplacement meansCutTrace target graphBut otherGraph
When switched toTrace targetTrace graph
Coordinate pointBased onotherCoordinate system corresponding to the graph
Parameter calculation means for calculating the parameters of the coordinate system
And the parameters obtained by the different coordinate system parameter calculating means.
Data value aboveotherSubstitute in the function expression of the graph coordinate system
Tana TraceCoordinate point to performTrace to specifyCoordinatefinger
A graph display characterized by comprising:Control device. (2)Y = F (X) which is a function formula of a rectangular coordinate system
And a function for storing r = g (θ) which is a function formula of a polar coordinate system.
A mathematical expression storage step; The above-described rectangular coordinate system stored in the function expression storage step
Y = F (X) which is a function formula of
Graphs corresponding to r = g (θ) on the same screen
A graph display control step of controlling display on the top, On the graph displayed by this graph display control step
Traces by indicating the coordinate points of
Tep, The graph to be traced by this trace step
A switching step for switching to a graph; By this switching step, the graph to be traced is
When switching to rough, the trace
Corresponding to other graphs based on the coordinate point
Different coordinate system parameter calculation
Tep, The parameters obtained by this different coordinate system parameter calculation step
Substituting the parameter values into the function expressions in the other graph coordinate system above
Trace point to specify the coordinate point to perform a new trace
Mark designation step; A graph display control method, comprising: