JP5581768B2 - Graph display device and program - Google Patents

Description

  The present invention relates to a graph display device and a program capable of displaying a graph corresponding to an input function expression.

  In an electronic computer having a function calculation function, when a graph mode is set and an arbitrary function expression or statistical data is input, a graph corresponding to the input function expression or statistical data is drawn and displayed. "Calculator" has been put into practical use.

  The display information handled here includes a graph expression (function expression) corresponding to the graph, X and Y coordinate values at a specified position on the graph, in addition to the graph. However, since these data are of different types, it is difficult to compare the corresponding relationships when a plurality of graphs are displayed.

  Furthermore, in recent years, the screen size of electronic computers has increased, and an arbitrary image can be set as a background image. However, if a background image is set, graphs, relational expressions, and coordinate values are displayed superimposed on the background image, which causes a problem that the visibility of the background image is significantly reduced.

  Here, for example, Japanese Patent Application Laid-Open No. 2004-151867 is one that displays images of different data types at the same time. In this Patent Document 1, when displaying a graphic image within a window at the same time as a video image, the background color of the graphic image is mixed with the color of the video image, thereby hiding the underlying video image without hiding the graphic image. It is possible to display an image.

JP 2009-124752 A

  The above-mentioned patent document 1 is for improving the visibility problem in displaying a graphic image superimposed on a video image. A graph and a character string (X and Y coordinate values and graph formulas associated with the graph) are disclosed. Cannot be associated with the character string.

  As described above, in the conventional graph display measure, when the graph is displayed according to the function expression input by the user, it is difficult to grasp the correspondence between the graph and the character string related to the graph. If the character string overlaps with the character string, the visibility of the character string may be significantly deteriorated and may not be recognized.

The present invention has been made in view of the problems as described above, the graph visually easily grasp the relevant character string and the corresponding relationship to the graph, also viewable string in a state of overlapping a plurality of graphs It is an object to provide a simple graph display device and program.

The graph display device according to claim 1 of the present invention is a list data storage means in which a numerical value is stored in each cell of list data, and a list graph input means for inputting a graph expression including a list variable in response to a user operation. When, in advance of each graph corresponding to each graph formula input the numerical value of each cell stored in the list data storage means in a variable list of the input graph expression by pre Symbol list graph input means to each of said cells a first display processing means for displaying on the screen in the color set, the graph displayed by the first display processing unit selected as traced, the character string associated with the graph before Symbol screen And a second display processing means for displaying the character string in the form of a character with a modification.

According to the present invention, it is possible to visually easily grasp the graph and the character string related to the graph and the correspondence relationship, and one or more of the graphs of each graph formula in which the numerical value of each cell of the list is input to the graph formula is It is possible to visually recognize the character string even when it overlaps the character string.

FIG. 1 is a front view showing an external configuration of an electronic computer used as a graph display device according to the first embodiment of the present invention. FIG. 2 is a diagram for explaining the configuration of the color system in the embodiment, and is a diagram schematically representing three attributes of the color (hue, brightness, and saturation). FIG. 3 is a block diagram showing a circuit configuration of the electronic computer in the embodiment. FIG. 4 is a block diagram showing a functional configuration of a CPU provided in the electronic computer according to the embodiment. FIG. 5 is a diagram showing a configuration of graph data stored in a graph storage area of a memory provided in the electronic computer according to the embodiment. FIG. 6 is a diagram showing a configuration of graph color data stored in a graph color storage area of a memory provided in the electronic computer in the embodiment. FIG. 7 is a diagram showing a configuration of character string data stored in the first work area of the memory provided in the electronic computer according to the embodiment. FIG. 8 is a flowchart showing the overall flow of the function graph display process executed by the CPU provided in the electronic computer in the embodiment. FIG. 9 is a flowchart showing the flow of color graph display processing executed by the CPU provided in the electronic computer in the embodiment. FIG. 10 is a flowchart showing the flow of saturation lightness correction processing executed by the CPU provided in the electronic computer in the embodiment. FIG. 11 is a flowchart showing the flow of color character display processing A executed by the CPU provided in the electronic computer in the embodiment. FIG. 12 is a view showing a display example of a graph type input screen of the electronic computer in the same embodiment. FIG. 13 is a view showing a display example of various setting screens of the electronic computer in the embodiment. FIG. 14 is a diagram showing a display example of an image selection screen of the electronic computer in the same embodiment. FIG. 15 is a diagram showing a graph display example of graph number 1 (Y1) of the electronic computer in the same embodiment. FIG. 16 is a diagram showing a display example of two graphs of graph number 1 (Y1) and graph number 2 (Y2) of the electronic computer in the same embodiment. FIG. 17 is a diagram showing a display example when the graph of graph number 1 (Y1) of the electronic computer in the embodiment is traced. FIG. 18 is a diagram showing a display example when the tracing target of the electronic computer in the embodiment is switched from the graph of graph number 1 (Y1) to the graph of graph number 2 (Y2). FIG. 19 is a flowchart showing the processing operation of the second embodiment of the present invention, and is a flowchart showing the flow of the color character display processing B executed by the CPU provided in the electronic computer. FIG. 20 is a view showing a display example of a list input screen of the electronic computer in the same embodiment. FIG. 21 is a diagram showing a display example of a list input screen of the electronic computer in the same embodiment. FIG. 22 is a diagram showing a display example of a graph type input screen of the electronic computer in the same embodiment. FIG. 23 is a diagram showing a display example of a list graph screen of the electronic computer in the same embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a front view showing an external configuration of an electronic computer used as a graph display device according to the first embodiment of the present invention. This electronic computer is called a “graph function calculator” and has a function for drawing and displaying a graph corresponding to an input function expression or statistical data.

  The main body of the electronic computer 10 is provided with a key input unit 12 in a range of about two thirds from the lower end of the front of the main body, and a display unit 13 in a range of about one third from the upper end.

  The key input unit 12 includes a numeric / symbol key 12a, a function / operator key 12b, a "MENU" key 12c, a "SHIFT" key 12d, an "OPTN" key 12e, an "EXE" key 12f, a cursor key 12g, and a function Keys “F1” to “F6” are provided.

  The numerical value / symbol key 12a includes a key group for inputting numerical values / symbols in which individual keys such as numerals and symbols are arranged.

  The function / operator key 12b includes arithmetic functions, various function symbol keys operated when inputting a function expression, and operator keys such as “+”, “−”, “×”, “÷”, and “=”. .

  The “MENU” key 12c is a calculation mode in which an arbitrary calculation formula such as an arithmetic calculation formula or a function calculation formula is input to perform calculation processing, a graph mode in which graph drawing processing corresponding to the input function formula is performed, It is operated when displaying a selection setting menu for various operation modes such as an e-Activity mode for performing learning processing of graph functions and a program mode for inputting an arbitrary program to perform corresponding calculation processing.

  The “SHIFT” key 12d is operated together with the corresponding key when the various symbols and functions described at the upper left of each key top in the key input unit 12 are designated and input.

  The “OPTN” key 12e is operated together with the corresponding key when the various symbols and functions described in the upper right of each key top in the key input unit 12 are designated and input.

  The “EXE” key 12f is operated to instruct confirmation of selected or input data and execution of various processing functions.

  The cursor keys “↑”, “↓”, “←”, and “→” 12g are operated when selecting and sending the displayed data, and when moving the cursor CL.

  The function keys “F1” to “F6” are operated when executing the functions of various buttons arranged and displayed along the lower end of the screen of the display unit 13 in accordance with various operation modes. The function key “F1” is operated when a trace function described later is executed.

  In addition, a liquid crystal display device capable of color display having a display range of, for example, vertical 186 dots × horizontal 378 dots is used for the display unit 13, and an arbitrary color image is displayed as a background image as will be described later.

  The object of the present invention is to improve the visibility when a graph is displayed on the display unit 13 with a background image. Here, for easy understanding, the configuration of the color system will be briefly described with reference to FIG.

  FIG. 2 is a diagram for explaining the configuration of the color system, and schematically shows three attributes of color (hue, lightness, and saturation). Actually, each hexagonal cell in the figure is expressed in various colors corresponding to the color arrangement of the color system.

  A color is expressed by hue, lightness, and saturation. “Hue” is a difference in color appearance such as red (R), green (G), blue (B), and purple (P). “Brightness” means the brightness of a color. “Saturation” means the vividness of a color.

  In the present embodiment, the brightness and saturation are expressed in 6 levels of 0 to 6, respectively. For example, “G4” in the figure means that the hue is green (G) and the saturation is 4 levels. Similarly, “B4” has a hue of blue (B) and saturation of 4 levels, “P4” has a hue of purple (P) and saturation of 4 levels, and “R4” has a hue of red ( R) means that the saturation is 4 levels.

  Monotone (M) is represented only by lightness, and “M6” in the figure means that the lightness is 6 levels.

  FIG. 3 is a block diagram showing a circuit configuration of the electronic computer 10.

  The electronic computer 10 includes a CPU 11 that is a microcomputer. The CPU 11 operates each part of the circuit by starting a program, and executes various functions provided in the electronic computer 10 such as a calculator function and a function graph display function. In addition to the key input unit 12 and the display unit 13 shown in FIG. 1, the CPU 11 is connected to a memory 14, a recording medium reading unit 16, a communication control unit 17, and the like.

  The memory 14 includes a ROM, a RAM, and the like, and stores various data necessary for the processing operation of the CPU 11. In this memory 14, in addition to a program storage area 14a that stores program data including a function graph display program for realizing the present invention, a graph expression that stores an input function expression as graph expression data (see FIG. 5). A storage area 14b, a graph color storage area 14c that stores graph color data (see FIG. 6) for setting colors in the graph, a background image file storage area 14d that stores various background image files, and the like are provided.

  The memory 14 is provided with work areas 14e to 14g. In the first work area 14e, data (character string data for coordinate values) indicating the values of the X coordinate and Y coordinate calculated according to the graph expression at the time of tracing, and data regarding the character string indicating the graph expression (graph Formula character string data) is stored (see FIG. 7).

  In the second work area 14f, a background image displayed on the screen of the display unit 13 is stored as color screen data. In the third work area 14g, a coordinate range reference value for enlargement / reduction capable of tracing the X scale value is stored.

  The recording medium reading unit 16 reads data recorded on the recording medium 15. As the recording medium 15, for example, a memory card is used, and a program, a background image, and the like are recorded.

  The communication control unit 17 performs data communication with an external terminal connected via a USB (Universal Serial Bus) (not shown) or data with an external terminal connected wirelessly via a predetermined communication line. Communicate.

  FIG. 4 is a block diagram showing a functional configuration of the CPU 11 provided in the electronic computer 10.

  The CPU 11 includes a color graph input unit 11a, a background image setting unit 11b, a first display processing unit 11c, a second display processing unit 11d, and a first lightness / saturation correction unit as functions related to the graph display of the present invention. 11e and a second lightness / saturation correction unit 11f.

  The color graph input unit 11a sets one of a plurality of colors through a graph type input screen 21 (see FIG. 12), which will be described later, according to a user operation (operation of the key input unit 12), and graph type input processing. I do.

  The background image setting unit 11b sets a background image through various setting screens 22 (FIG. 13) and an image selection screen 23 (FIG. 14), which will be described later, in response to a user operation (operation of the key input unit 12).

  The first display processing unit 11c overlays the background image set by the background image setting unit 11b and displays a graph corresponding to the graph expression input by the color graph input unit 11a in the set color of the display unit 13. Display on the screen.

  The second display processing unit 11d selects the graph displayed by the first display processing unit 11c as a trace target, and displays a character string related to the graph on the screen of the display unit 13 in the same color as the graph. At the same time, the character string is displayed in the form of a qualified character.

  In addition, the second display processing unit 11d displays the character string in the form of a qualified character when the character string related to the graph overlaps the graph regardless of the presence or absence of the background image.

  The character string related to the graph is a character string indicating the X coordinate value and the Y coordinate value obtained from the graph expression or a character string indicating the graph expression.

  When the color of the graph displayed by the first display processing unit 11c is similar to the color of the background image, the first lightness / saturation correcting unit 11e increases the color of the graph in the direction of increasing the visibility of the graph. Correct the saturation of.

  Further, the first lightness / saturation correcting unit 11e has a case where the color of the graph displayed by the first display processing unit 11c is monotone, and the color of the graph is similar to the color of the background image. , Correct the brightness of the color of the graph in the direction to increase the visibility of the graph.

  The second lightness / saturation correcting unit 11f increases the visibility of the character string when the color of the character string displayed by the second lightness / saturation correcting unit 11f is similar to the color of the background image. Correct the color saturation of the string.

  In addition, the second lightness / saturation correction unit 11f improves the visibility of the character string when the character string displayed by the second display processing unit 11d and the graph overlap and the colors of both are approximated. Correct the color saturation of the string in the direction of increasing.

  In the second lightness / saturation correction unit 11f, the color of the character string displayed by the second display processing unit 11d is monotone, the character string and the graph overlap, and the colors of both are approximated. If so, the brightness of the color of the character string is corrected in a direction to increase the visibility of the graph.

  FIG. 5 is a diagram showing the configuration of the graph data stored in the graph storage area 14 b of the memory 14 provided in the electronic computer 10.

The graph numbers in the figure are numbers for identifying each graph, and are assigned in order from 1. The graph formula (function formula) is input in association with this graph number on the graph formula input screen 21 (FIG. 12) described later. In this example, a state in which a graph expression such as “Y1 = − (X−2) ² +4” is input to the graph number 1 and “Y2 = 4” is input to the graph number 1 is illustrated. “Y1” indicates the first graph expression, and “Y2” indicates the second graph expression.

  FIG. 6 is a diagram showing a configuration of graph color data stored in the graph color storage area 14 c of the memory 14 provided in the electronic computer 10.

  The color (hue) of the graph is set in advance according to the graph number. Here, the graph number 1 is set in order of five colors of blue (B), red (R), green (G), purple (P), and monotone (M). Each graph number is preset with standard saturation along with the color. Specifically, the saturation of 4 levels in the range of 0 to 6 levels shown in FIG. 2 is set as a standard value by default. Note that the monotone (M) has no saturation, and thus becomes lightness, and the lightness of 6 levels in the range of 0 to 6 levels shown in FIG. 2 is set as a standard value by default.

  FIG. 7 is a diagram showing a configuration of character string data stored in the first work area 14e of the memory 14 provided in the electronic computer 10. As shown in FIG.

  The character string referred to here is a character string related to the graph, specifically, a character string indicating an X coordinate value and a Y coordinate value, and a character string indicating a graph expression. The first work area 14e stores data relating to these character strings (coordinate value character string data and graph expression character string data).

  The coordinate value character string data includes X-coordinate and Y-coordinate values calculated from a graph expression, display position, color (hue), and saturation data. The character string data for the graph formula includes a graph formula (function formula) and its display position, color (hue), and saturation data.

Next, the operation of the embodiment will be described.
Note that the processes shown in the following flowcharts are executed when the CPU 11, which is a computer, reads a program stored in the program storage area 14 a of the memory 14.

  FIG. 8 is a flowchart showing the entire flow of the function graph display process executed by the CPU 11 provided in the electronic computer 10.

  First, the LIST function of the present apparatus is activated and LIST data is input by a user operation (operation of a “MENU” key 12c provided in the key input unit 12 of the electronic computer 10) (step A11).

  Next, the graph function of the present apparatus is activated by a user operation, and a graph type input screen 21 as shown in FIG. 12 is displayed on the display unit 13. Y1, Y2, Y3,... Provided on the graph type input screen 21 indicate graph type input areas for respective colors corresponding to the graph numbers, and the user can select a desired graph type input area by operating the cursor key 12g. The selection is made with the cursor CL, and an arbitrary graph expression (function expression) is input thereto (step A12).

  In addition, the symbol attached | subjected to the left side of the screen in a figure represents the color set to the graph type input area. This symbol is given for the sake of convenience in the drawing. Actually, the symbol is displayed in the following colors on the screen, and the user can see the color and input a graph expression. .

B: Blue, R: Red, G: Green, P: Purple, M: Monotone In the example of FIG. 12, the graph number 1 is Y1 = − (X−2) ² +4 and the graph number 2 is Y2 = 4. A state in which an expression is input is shown.

  When the user inputs an arbitrary graph expression through such a graph expression input screen 21, the input graph expression is stored in the graph expression storage area 14b of the memory 14 shown in FIG. 5 and corresponds to the graph number. The selected color and the standard value of the saturation of the color are set in the graph color storage area 14c of the memory 14 shown in FIG. 6 (step A13).

  In this case, four levels are set as the standard value of saturation. In the case of monotone, 6 levels are set as the standard value of brightness.

  Next, when various setting screens 22 as shown in FIG. 13 are displayed on the display unit 13 and the item “Background” is selected and confirmed with the cursor CL, an image selection screen 23 as shown in FIG. 14 is displayed. Is displayed on the display unit 13.

  When the file number to be used as the background image is designated with the cursor CL on the image selection screen 23, the corresponding background image is read from the background image file storage area 14d of the memory 14 and the second work area 14f of the memory 14 is read. Are developed as color screen data of 186 dots vertically by 378 dots horizontally and then displayed on the screen of the display unit 13 (step A14).

  Here, when a background image is displayed on the screen of the display unit 13, the color graph display process shown in FIG. 9 is executed (step A15).

  FIG. 9 is a flowchart showing the flow of color graph display processing executed by the CPU 11 provided in the electronic computer 10.

  First, a graph number input first by the user is selected as a drawing target (step B11), and information on the hue and saturation (lightness in the case of monotone) of the graph corresponding to the graph number is stored in the graph color of the memory 14. Read from the area 14c (step B12).

  Here, based on the display position of the graph to be rendered, the dot data of the background image in the vicinity of the display position (for example, the range of the surrounding 10 dots) is stored in the second work area 14 f of the memory 14. It is read from the screen data (step B13), and the average value of the hue, saturation and lightness of each dot within the range is calculated (step B14).

  The average value of hue is to obtain the hue existing at the average position of the hue of each dot within the above range in the color arrangement of the color system shown in FIG. For example, in the case of a dot having a hue of “B4” and a dot having a hue of “P4”, the hue at an intermediate position of a straight line connecting the position of “B4” and the position of “P4” is obtained as an average value. And

  The average value of saturation is obtained by summing the saturation of each dot within the range and dividing the total value by the number of dots. Similarly, the average value of brightness is obtained by adding the brightness of each dot within the range and dividing the total value by the number of dots.

  When the average values of the hue, saturation, and brightness of each dot in the background image are obtained in this way, the saturation brightness correction process shown in FIG. 10 is executed.

  FIG. 10 is a flowchart showing the flow of saturation lightness correction processing executed by the CPU 11 provided in the electronic computer 10. The hue, saturation, and brightness of the background image referred to here are the average values obtained in Step B14.

  First, it is determined whether or not the color of the graph to be drawn is M (monotone) (step C11). If it is not M (monotone) (No in Step C11), the brightness of the color of the background image is compared with the saturation of the color of the graph to be rendered in the color system color arrangement shown in FIG. Step C12).

  Here, if the difference between the lightness of the color of the background image and the saturation of the color of the graph to be rendered is greater than 2 (No in step C12), then the saturation of the background image and the graph to be rendered The color saturation is compared (step C13). As a result of comparing the saturations of the two, if the difference is larger than 2 (No in step C13), the process proceeds to step B16 in FIG. 9 as it is.

  That is, if the difference between the lightness of the color of the background image and the saturation of the color of the graph to be drawn is greater than 2 and the saturation difference is also greater than 2, the graph is drawn on the background image. It is determined that visual recognition is possible, and the saturation lightness correction process is not executed.

  On the other hand, when the difference between the lightness of the color of the background image and the saturation of the color of the graph to be drawn is smaller than 2 (Yes in Step C12), or when the difference in saturation is smaller than 2 (Step C13). Yes), when the condition of step C14 is satisfied, the saturation lightness correction process is executed.

  That is, the hue of the background image is compared with the hue of the graph to be drawn (step C14). When the difference between the two hues is 3 or less, that is, when the distance between the two hues approximates within the range of 3 or less in the color arrangement of the color system shown in FIG. 2 (Yes in step C14). ) The saturation of the color of the graph is corrected so that the graph to be drawn can be visually recognized on the background image (step C15).

  Specifically, the saturation of the color of the graph is corrected so that the difference from the saturation of the background image is 4 or more. In this case, the saturation of the color of the graph is corrected in the direction of increasing the visibility of the graph by comparison with the saturation of the background image. For example, if the saturation of the background image is 2, the saturation of the color of the graph is corrected from the standard value of 4 to 6. On the contrary, if the saturation of the background image is 5, for example, the saturation of the color of the graph is corrected from the standard value 4 to 1.

  If the color of the graph to be drawn is M (monotone) (Yes in step C11), the lightness of the color of the background image is compared with the lightness of the color of the graph to be drawn (step). C16). Then, when the difference in brightness between the two is 2 or less, that is, in the color arrangement of the color system shown in FIG. 2, the brightness interval between the two is approximated within 2 or less (Yes in step C16). ) The brightness of the color of the graph is corrected so that the brightness with the background image is 3 so that the graph to be drawn can be visually recognized on the background image (step C17).

  Returning to the flowchart of FIG. 9, after completion of the saturation lightness correction processing, the graph is drawn in a preset color with the corrected saturation or lightness at the display position of the graph (step B16). Specifically, dot data including information on the saturation or lightness after the correction of the graph and the set color is developed in the second work area 14f of the memory 14 and displayed at a specified position on the screen of the display unit 13. Is done. At this time, since the background image is already displayed in color on the screen of the display unit 13, the graph is displayed in color on the background image.

  FIG. 15 shows a graph display example of graph number 1 (Y1).

In the figure, reference numeral 31 denotes a background image. Here, an image of the fountain is displayed in color on the screen of the display unit 13 as a background image. Also, 32 is an X axis of graph coordinates, 33 is a Y axis of graph coordinates, and 34 is a graph of graph number 1. Here, a quadratic curve of Y1 = − (X−2) ² +4 is displayed in color. .

  Here, the colors set in advance for the graph number 1 are “B (blue)” and saturation “4” (see FIG. 6), but the color (background color) of the portion of the background image 31 where the graph 34 is displayed. ), Brightness correction processing is performed. In this case, for example, if the background color is close to black, no particular correction is required and the image is displayed as it is. On the other hand, if the background color is close to blue, the color saturation of the graph 34 is corrected and displayed in order to distinguish it from the background color.

  Also, as shown in FIG. 9, if there is a next graph (Yes in Step B17), that graph number 2 (Y2) is selected as a drawing target (Step B18), and the processing of Steps B12 to B16 is repeated. Thus, the graph with the graph number is displayed on the background image. In this case as well, the saturation or lightness of the color of the graph is corrected in relation to the color of the background image of the portion where the graph is displayed as described above.

  FIG. 16 shows an example in which two graphs of graph number 1 (Y1) and graph number 2 (Y2) are displayed.

  In the figure, 35 is a graph of graph number 2, and here, a linear curve of Y2 = 4 is displayed in color. The preset colors for the graph number 2 are “R (red)” and saturation “4” (see FIG. 6), but the color (background color) of the background image 31 of the portion where the graph 35 is displayed. Will be corrected in relation to In this case, for example, if the background color is a color close to red (near hue R, lightness 4, saturation 6), the color saturation of the graph 35 is changed from the standard value 4 to distinguish it from the background color. It is corrected to 2 and displayed.

  Thereafter, in the same manner, a plurality of graphs input by the user are sequentially displayed in color, and when each approximates a background color, the saturation of the color of the graph is appropriately corrected and displayed. Therefore, even when a plurality of graphs are displayed in color on the background image on the display unit 13, each of these graphs can be visually recognized by color.

  Returning to FIG. 8, when the color graph display process is completed (step A15), the coordinate range reference value for scaling that can trace the X scale value is stored in the memory 14 as the data for tracing the graph being displayed. 3 work area 14g.

  Here, when the user activates the trace function by operating the function key “F1” of the key input unit 12 shown in FIG. 1 (Yes in Step A17), first, the coordinates written in the third work area 14g. The initial value of the X coordinate is set based on the range reference value (step A18), and the first graph (graph of graph number 1) is traced and displayed according to the initial value of the X coordinate (step A19).

  At that time, a graph expression (function expression) corresponding to the graph is read out, the X coordinate value and the Y coordinate value of the initial position of the trace pointer P are calculated according to the graph expression, and the trace pointer P is displayed there. (See FIG. 17).

  At this time, the character string representing the X coordinate value of the trace pointer P, its display position, color (hue), and standard saturation data are used as the character string data for the X coordinate value in the first character string shown in FIG. The work area 14e is set (step A20). Similarly, a character string representing the value of the Y coordinate of the trace pointer P, its display position, color (hue), and standard saturation are set in the first work area 14e as character string data for the Y coordinate value. (Step A22).

  Further, the character string representing the graph expression, its display position, color (hue), and standard saturation are set in the first work area 14e as character string data for the graph expression (step A24).

  These character strings are displayed at predetermined positions on the screen in correspondence with the graph to be traced. At this time, as in the color display of the graph described above, the saturation or brightness of the color of these character strings is corrected in relation to the background color (steps A21, A23, A25). FIG. 11 shows details of the color character display processing A at that time.

  FIG. 11 is a flowchart showing the flow of the color character display process A executed by the CPU 11 provided in the electronic computer 10.

Now, description will be made assuming that a character string indicating an X coordinate value is drawn on the screen.
First, the character string indicating the X coordinate value corresponding to the graph number 1, the display position, the color (hue), and the standard saturation data are read from the first work area 14e of the memory 14 (step D11). In the example of FIG. 7, “X = 2” as the character string indicating the X coordinate value, “(1-50, 2-20)” as the display position, “blue (B)” as the color (hue), As a result, “4” is read out.

  Here, the dot data of the background image in the range of the display position of the X coordinate value to be rendered is read from the color screen data stored in the second work area 14f of the memory 14 (step D12), and within that range The average value of hue, saturation, and brightness of each dot is calculated (step D13). Then, using these average values, saturation lightness correction processing is executed (step D14).

  The saturation lightness correction process is the same as that in the flowchart of FIG. Also in this case, the saturation of the color of the character string (monotone color) so that the character string “X = 2” indicating the X coordinate value to be rendered can be visually recognized on the background image in relation to the color of the background image. In the case, the brightness) is corrected.

  After completion of the saturation lightness correction process, the character string is drawn at the display position in a color preset with the corrected saturation or lightness. At that time, the character string is drawn with a modification (step D15).

  Specifically, the saturation or lightness after correction of the character string, information on the set color, and dot data including character modification information are developed in the second work area 14 f of the memory 14, and are displayed on the display unit 13. It is displayed at the specified position on the screen. At this time, since the background image is already displayed in color on the screen of the display unit 13, the character string is displayed in color over the background image.

  Note that “with modification” specifically means “with shadow”. That is, the character string related to the graph is displayed in the form of a shaded character.

The same applies to the character string “Y = 4” indicating the Y coordinate value, and the character string “Y1 = − (X−2) ² +4” indicating the graph expression, and these can be visually recognized on the background image. The color saturation of the character string (lightness in the case of monotone) is corrected, and the character string is drawn with a modification (with a shadow).

  FIG. 17 shows a display example when the graph of graph number 1 (Y1) is traced.

  In the figure, P is a cross-shaped trace pointer, 41 and 42 are character strings indicating the X coordinate value and Y coordinate value of the position indicated by the trace pointer P, and 43 is a character string indicating a graph expression.

  For these character strings 41 to 43, as in the color display of the graph 34 to be traced, the saturation (lightness in the case of monotone) is corrected so that it can be visually recognized on the background image at each display position. . Then, it is displayed in color at a predetermined position in the form of a shaded character. Thereby, even if various colors are used for the background image, the visibility of the character strings 41 to 43 can be enhanced on the background image.

  Here, when the user operates the left direction key (“←” key) or the right direction key (“→” key) of the cursor key 12g provided in the key input unit 12 (Yes in step A26), The trace pointer P moves in the X axis direction (step A27).

  Specifically, every time the left arrow key or right arrow key is operated, the X coordinate value is increased or decreased, and the Y coordinate value with respect to the X coordinate value after the increase or decrease is calculated according to the expression of the graph currently being traced. The display position of is updated.

  Further, in accordance with the movement of the trace pointer P, the character string indicating the updated X coordinate value and the character string indicating the Y coordinate value are displayed in color (steps A20 to A23). Also at this time, the color of these character strings is displayed so that the character string indicating the X coordinate value and the character string indicating the Y coordinate value to be rendered can be visually recognized on the background image in relation to the color of the background image. The degree (lightness in the case of monotone) is corrected and displayed with a modification (with a shadow).

  In addition, when the user operates the up direction key (“↑” key) or the down direction key (“↓” key) of the cursor key 12g provided in the key input unit 12 (Yes in Step A28), the trace is performed. The target graph is switched in ascending order or descending order of the graph number (step A29), and the trace pointer P is displayed on the switched graph (step A30).

  Specifically, for the currently set X coordinate value, the Y coordinate value is calculated according to the switched graph formula, and the trace pointer P is displayed at the position indicated by the X coordinate value and the Y coordinate value.

  Thereafter, the processing of steps A20 to A27 is repeated in the same manner, and the character string indicating the X coordinate value and the Y coordinate value, and the character string indicating the graph expression are set at a predetermined position in accordance with the trace operation of the switched graph. The color saturation (lightness in the case of monotone) of these character strings is appropriately modified in relation to the color of the background image and displayed in color.

  FIG. 18 shows a display example when the trace target is switched from the graph of graph number 1 (Y1) to the graph of graph number 2 (Y2).

  As described above, the graph to be traced is switched by operating the up key (“↑” key) or the down key (“↓” key) of the cursor key 12g. In the example of FIG. 18, the state switched to the graph 35 of graph number 2 (Y2) is shown. In the figure, P is a cross-shaped trace pointer, 51 and 52 are character strings indicating the X coordinate value and Y coordinate value of the position indicated by the trace pointer P, and 53 is a character string indicating a graph expression.

  Similarly to the color display of the trace target graph 35, the saturation (lightness in the case of monotone) is corrected so that these character strings 51 to 53 are visible on the background image at each display position. . Then, it is displayed in color at a predetermined position in the form of a shaded character. Thereby, even if various colors are used for the background image, the visibility of the character strings 41 to 43 can be enhanced on the background image.

  In this way, the color is set for each graph, and the character string related to the graph is displayed in the same color as the graph, so even if many graphs are displayed, it is possible to grasp the correspondence relationship by color it can.

  In addition, the character string related to the graph is displayed in the form of a character with a modifier (shadowed character), so that the visibility of the character string can be improved, even if it is overlaid on the background image The correspondence with the inside graph can be easily grasped.

  In this case, as a character string related to the graph, a character string indicating the X coordinate value and the Y coordinate value obtained from the graph expression or a character string indicating the graph expression is displayed, and the correspondence between the graph and these character strings The function graph can be effectively learned while confirming on the same screen.

  In addition, when a graph is displayed over the background image, the color saturation (lightness in the case of monotone) set in the graph is corrected in consideration of the relationship with the color of the background image. Therefore, the visibility of the graph on the background image can be ensured. Thereby, even if a background image is set, a graph can be displayed without specifications.

  The same applies to a case where a character string related to the graph is displayed over the background image, and considering the relationship with the color of the background image, the saturation of the color set for the character string (monotone In this case, the visibility of the character string on the background image can be ensured by correcting the brightness.

(Second Embodiment)
Next, a second embodiment of the present invention will be described.

  In this electronic computer 10, it is possible to display a plurality of graphs on the screen of the display unit 13 using each numerical value input as LIST data as a variable of a graph formula (function formula). However, since a large number of graphs are displayed, there is a problem that a character string related to the graph is likely to overlap with the graph. In 2nd Embodiment, the visibility of the character string which overlaps with such a graph is improved.

  As described in the first embodiment, by inputting LIST data and a graph expression (function expression) by a user operation, a graph corresponding to the graph expression is displayed on the screen of the display unit 13 in a preset color. Is displayed. In that case, it can also be displayed on the screen of the display unit 13 by designating an arbitrary image as a background image.

  Here, by inputting a plurality of numerical values as LIST data, it is possible to display a large number of graphs using these numerical values as variables of a graph formula.

  This situation will be specifically described with reference to FIGS.

  20 and 21 are diagrams showing display examples of the list input screen 61. FIG. 20 shows a state in which numerical values are input in the seventh to tenth cells of “List1”, and FIG. 21 shows 17 of “List1”. It shows a state in which numerical values are entered in the 20th to 20th cells. CL in the figure is a cursor, and a numeric value is input by moving the cursor CL in cell units by operating the cursor key 12g of the key input unit 12.

  First, when the user operates a “MENU” key 12 c provided in the key input unit 12, the LIST function of the apparatus is activated to input LIST data. At this time, as shown in FIG. 20, the user adds 0.1 units such as “0.1”, “0.2”, “0.3”... “1.0” to each cell of “List1”. Enter 10 numbers in order. Then, as shown in FIG. 21, when 10 numerical values are sequentially input in units of 0.5, such as “1.5”, “2.0”, “2.5”,. To do.

  Next, the user activates the graph function of the apparatus, displays a graph type input screen 62 as shown in FIG. 22 on the display unit 13, and designates the graph number on the graph type input screen 62 with the cursor CL. Then, an arbitrary graph expression (function expression) is input there. At that time, it is possible to input a graph expression (function expression) using the numerical value of the LIST data as a variable.

  In the example of FIG. 22, a state in which a graph expression “Y1 = −List1X” is input to the graph number 1 is illustrated. As in FIG. 12, symbols on the left side of the screen in the figure represent colors set in the graph input area. This symbol is given for the sake of convenience in the drawing. Actually, the symbol is displayed in the following colors on the screen, and the user can see the color and input a graph expression. .

    B: Blue, R: Red, G: Green, P: Purple, M: Monotone.

  FIG. 23 is a diagram showing a display example of a list graph screen.

  When the user selects graph number 1 and activates the trace function by operating the function key “F1”, a list graph screen 63 as shown in FIG. 23 is displayed. In the figure, 71 is an X axis of graph coordinates, 72 is a Y axis of graph coordinates, and 73 is a list graph group of graph number 1.

  The list graph group 73 is composed of a plurality of graphs with 20 numerical values inputted as LIST data in “List1” of the list input screen 61 as variables. These graphs are expressed as follows.

1: Y1 = −0.1X
2: Y1 = −0.2X
3: Y1 = −0.3X
(Omitted)
17: Y1 = −4.5X
18: Y1 = −5.0X
19: Y1 = −5.5X
20: Y1 = −6.0X.

  Each graph of the list graph group 73 is set in order of five colors of blue (B), red (R), green (G), purple (P), and monotone (M) from the graph number 1 on the graph type input screen 62. Is displayed in color. In the example of FIG. 23, the line type of the graph is changed for the sake of convenience of the drawing, and each graph is displayed in different colors. As described in the first embodiment, when a background image is set, the saturation of the color of each graph (lightness in the case of monotone) is corrected in relation to the color of the background image. (See step A15 in FIG. 8, FIG. 9).

  In the figure, P is a cross-shaped trace pointer, 74 and 75 are character strings indicating the X coordinate value and the Y coordinate value at the position indicated by the trace pointer P, and 76 is a formula of a graph selected as a trace target. It is a string. These character strings 74, 75, and 76 are displayed in the same color as the graph selected as the trace target. At this time, the saturation (lightness in the case of monotone) of these character strings 74, 75, 76 is corrected in relation to the background image or the color of the graph.

The processing operation of the second embodiment will be described in detail below.
FIG. 19 is a flowchart showing the processing operation of the second embodiment, and is a flowchart showing the flow of the color character display process B executed by the CPU 11 provided in the electronic computer 10. The color character display process B is executed in place of the color character display process A in steps A21, A23, and A25 in the function graph display process shown in FIG.

  With the selection of a graph to be traced, when displaying a character string related to the graph, it is first determined whether or not a background image has been set (step E11). The character string related to the graph is a character string indicating an X coordinate value or a Y coordinate value, or a character string indicating a graph expression. In the example of FIG. ”,“ Y = −0.09 ”of the character string 75, and“ Y1 = −List1X ”of the character string 76.

  If no background image is set (No in step E11), it is determined whether or not the character string overlaps one or more graphs of each graph displayed on the screen (step E12). , E13).

  If the character string does not overlap any graph (No in Step E12, No in E13), the character string is drawn in a preset color with standard saturation or lightness at the display position. (Step E14). In the example of FIG. 23, “X = 0.9” in the character string 74 corresponds to a character string that does not overlap the graph.

  On the other hand, when a background image is set (Yes in Step E11), or when the character string overlaps one or a plurality of graphs displayed on the screen (Yes in Step E12, The following correction process is executed.

  That is, first, the corresponding character string, its display position, color (hue), and standard saturation data are read from the first work area 14e of the memory 14 (step E15). In the example of FIG. 23, “Y = −0.09” of the character string 75 and “Y1 = −List1X” of the character string 76 are character strings overlapping the graph, and these data are read out.

  Here, the dot data of the background image in the range of the display position of the character string or the image where the graph overlaps (hereinafter referred to as the background graph superimposed image) is stored in the second work area 14 f of the memory 14. The read color screen data is read out (step E16), and the average values of hue, saturation and lightness of each dot within the range are calculated (step E17).

  Here, the hue, saturation, and brightness of the character string are compared with the average value of the hue, saturation, and brightness of each dot within the range of the background graph superimposed image. As a result, when the hue of the character string is close to that of the background graph superimposed image and the saturation of the color of the character string (lightness in the case of monotone) is close to the value of the background graph superimposed image, It is judged that the lightness needs to be corrected.

  Specifically, in the color arrangement of the color system shown in FIG. 2, when the difference between the saturation or lightness of the color of the character string and the saturation or lightness of the background graph superimposed image is 3 levels or less, It is determined that it is necessary to correct the brightness, and the color saturation or brightness of the character string is corrected so as to be a value (for example, 4 levels or more) that is separated from the saturation or brightness of the background graph superimposed image (Step 4). E18).

  After completion of the saturation lightness correction process, the character string is drawn at the display position in a color preset with the corrected saturation or lightness. At that time, the character string is drawn with a modification (step E19).

  Specifically, the saturation or lightness after correction of the character string, information on the set color, and dot data including character modification information are developed in the second work area 14 f of the memory 14, and are displayed on the display unit 13. It is displayed at the specified position on the screen. At this time, since the background image or graph is already displayed in color on the screen of the display unit 13, the character string is displayed in color over the background image or graph.

  As in the first embodiment, “with modification” specifically means “with shadow”. That is, the character string related to the graph is displayed in the form of a shaded character.

  As described above, since the character string indicating the X coordinate value and the Y coordinate value displayed at the time of tracing and the character string indicating the graph expression are displayed in the same color as the graph, a large number of graphs are displayed. Can also grasp the corresponding relationship by color.

  Furthermore, as shown in the example of FIG. 23, when a character string is displayed over the graph, it is displayed in the form of a modified character (shadow character) regardless of the presence or absence of a background image. The visibility of the character string is improved, and the correspondence with the graph being displayed can be easily grasped.

  In addition, when a character string is displayed over the graph, the saturation (the brightness in the case of monotone) of the color set for the character string is corrected in consideration of the relationship with the color of the graph. Thus, the visibility of the character string in a state where it overlaps the graph can be secured.

  In each of the above embodiments, five colors of blue (B), red (R), green (G), purple (P), and monotone (M) are set for the graph. Other colors may be used for setting, and a configuration in which five or more colors are used for setting may be used.

  In addition, as a form of character modification of the character string related to the graph, “shaded character” is taken as an example, but for example, “outline character” or “embossed character” may be used. In short, any form may be used as long as the character string associated with the graph can be visually recognized in a state where the character string overlaps the background image or the graph.

  In addition, each operation method by the electronic computer 10 described in each of the embodiments, that is, the method shown in each flowchart of FIGS. 8 to 10 and 19 is a memory card (ROM) as a program that can be executed by a computer. Card, RAM card, etc.), magnetic disk (flexible disk, hard disk, etc.), optical disk (CD-ROM, DVD, etc.), storage medium such as semiconductor memory (recording medium 15), and the like. The computer (CPU 11) of the electronic computer 10 can execute the same processing by the method described above by reading the program recorded in the storage medium.

  Further, program data for realizing the above technique can be transmitted as a program code form via a communication network (public line). And the computer (CPU11) of the electronic computer 10 can perform the same process by the method mentioned above by receiving this program in the communication apparatus (communication control part 17) connected to the communication network.

  Note that the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the respective embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

10 ... electronic calculator,
11 ... CPU,
11a: Color graph input part,
11b ... Background image setting unit,
11c ... 1st display process part,
11d ... second display processing unit,
11e ... 1st lightness saturation correction part,
11f 2nd lightness saturation correction part,
12 ... Key input part,
12a ... Numeric / symbol key 12b ... Function / operator key 12c ... "MENU" key 12d ... "SHIFT" key 12e ... "OPTN" key 12f ... "EXE" key 12g ... Cursor keys F1 to F6 ... Function keys 13 ... Display Unit 14 ... Memory 14a ... Program storage area 14b ... Graph type storage area 14c ... Graph color storage area 14d ... Background image file storage area 14e to 14f ... Work area 15 ... Recording medium 16 ... Recording medium reading section 17 ... Communication control section.

Claims (4)

List data storage means in which numerical values are stored in each cell of the list data;
A list graph input means for inputting a graph expression including a variable of the list according to a user operation;
Set in advance each graph corresponding to each graph formula input the numerical value of each cell stored in the list data storage means to a variable input list of graph expression by pre Symbol List graph input means to each of said cells First display processing means for displaying on the screen in the selected color;
The graph displayed by the first display processing unit selected as traced, and displays the character string associated with the graph before Symbol screen, first displays the character string in the form of a modified subscript 2 Display processing means,
A graph display device comprising: The second display processing means includes:
2. The graph display device according to claim 1, wherein when a character string related to the graph overlaps the graph, the character string is displayed in the form of a character with a modification. 3. The graph according to claim 1, wherein the character string related to the graph is a character string indicating an X coordinate value and a Y coordinate value obtained from the graph expression or a character string indicating the graph expression. Display device. A program used in a computer having a display unit for displaying a graph corresponding to an input graph expression,
The computer,
List data storage means in which numerical values are stored in each cell of the list data,
List graph input means for inputting a graph expression including a variable of the list in accordance with a user operation,
Set in advance each graph corresponding to each graph formula input the numerical value of each cell stored in the list data storage means to a variable input list of graph expression by pre Symbol List graph input means to each of said cells First display processing means for displaying on the screen in the selected color;
The graph displayed by the first display processing unit selected as traced, and displays the character string associated with the graph before Symbol screen, first displays the character string in the form of a modified subscript 2 Display processing means,
A computer-readable program designed to function as a computer.

Images