JP6286977B2 - Electronic device, display method, and display program - Google Patents

Description

The present invention relates to an electronic device, a display method, and a display program .

  A technique for displaying a function graph in an easy-to-read manner in a scientific calculator or spreadsheet software is known. For example, Patent Document 1 discloses a technique for changing the display range of a graph once displayed. In the graph display device of Patent Document 1, when a part is selected from a graph displayed in advance, the part is enlarged and displayed. Patent Document 2 discloses a technique for displaying a graph by setting a coordinate axis of a graph as a logarithmic axis by a user operation.

JP-A-7-152917 JP 2004-118447 A

  When the display range of a graph is changed using the technique of Patent Document 1, the difference in the display range between coordinate axes may increase. In such a case, it is desirable to display a graph with a logarithmic axis. However, simply applying the technique of Patent Document 2 requires the user to perform an operation for changing to a logarithmic axis. For this reason, there is a problem that the operation is complicated and the convenience for the user is low.

The present invention has been made in view of the above problems, and an object thereof is to provide a highly convenient electronic device, a display method, and a display program that change a display range of a graph.

In order to achieve the above object, an electronic apparatus according to the present invention provides:
An electronic device including a control unit,
The controller is
One of the two coordinate axes of the coordinates for which the graph is to be displayed is switched between a linear axis and a logarithmic axis, and the first coordinate in which one of the coordinate axes is switched and one of the coordinate axes cannot be switched. The first process for simultaneously displaying the second coordinates is automatically executed based on the difference between the display ranges of the two coordinate axes, or the first process is not executed regardless of the difference between the display ranges. Or accept settings,
Determining whether to execute the first process based on the received setting;
When it is determined to execute the first process, the second graph and the second graph on the second coordinate are displayed together with the first graph on the first coordinate and the first graph on the first coordinate. Display on the screen.
In addition, an electronic device according to another aspect of the present invention is
An electronic device including a control unit,
The controller is
Accepting an instruction to change the display range of at least one of the two coordinate axes of the coordinates for which the graph is to be displayed,
When the ratio of the display range of the other coordinate axis to the display range of one coordinate axis of the coordinate whose display range has been changed based on the instruction is greater than a threshold, the other coordinate axis is switched from a linear axis to a logarithmic axis, or The one coordinate axis is switched from a linear axis to a logarithmic axis when the ratio of the display range of one coordinate axis to the display range of the other coordinate axis of the coordinate whose display range is changed based on the instruction is larger than a threshold value. Two processes are executed.

According to the present invention, it is possible to provide a highly convenient electronic device, display method, and display program for changing the display range of a graph.

It is a block diagram which shows the function structure of the scientific calculator which concerns on Embodiment 1 of this invention. It is a block diagram which shows the physical structure of an information processing part. It is a flowchart which shows an example of a setting process. It is a figure which shows an example of the screen for a setting displayed by a setting process. It is a flowchart which shows an example of a graph display process. It is a flowchart which shows an example of a display area expansion process. It is a flowchart which shows an example of a display area reduction process. It is a flowchart which shows an example of a simultaneous display process. It is a figure which shows an example of the process result of a graph display process. It is a figure which shows an example of the process result of a graph display process.

  Hereinafter, a scientific calculator according to an embodiment for carrying out the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

(Embodiment 1)
The scientific calculator 1 includes (i) a function displaying a graph of the function, (ii) a function of accepting an operation for changing a display range of the function graph, and (iii) a coordinate axis of the graph according to the changed display range of the graph. Has a function of determining whether or not to switch between a linear axis and a logarithmic axis, and (iv) a function of displaying a graph in which coordinate axes are switched in accordance with the determination.

  As shown in FIG. 1, the scientific calculator 1 includes an input unit 10, an information processing unit 20, and a touch panel 30.

  The input unit 10 includes an operation reception device that accepts a user operation such as a keyboard, a button, and a pointing device, and a transmission unit that transmits information on an operation received by the operation reception device to the information processing unit 20. The input unit 10 receives a user operation with such a physical configuration, and transmits operation information to the information processing unit 20.

  As shown in FIG. 2, the information processing unit 20 physically includes a CPU (Central Processing Unit) 21, a RAM (Random Access Memory) 22, a ROM (Read-Only Memory) 23, an I / O (Input). / Output) unit 24 and an internal bus 26.

  The CPU 21 is a central processing unit that controls various functions of the scientific calculator 1. The CPU 21 executes a program loaded from the ROM 23 to the RAM 22 and executes processing to be described later.

The RAM 22 is a volatile memory that temporarily stores programs executed by the CPU 21 and intermediate data and is used as a work area when the CPU 21 performs various processes.
The ROM 23 is a non-volatile memory that stores a program executed by the CPU 21.

  The I / O unit 24 includes interface devices such as a USB (Universal Serial Bus), a serial port, and a LAN (Local Area Network) adapter, and the input unit 10 and the touch panel 30 connected to the information processing unit 20 and other external devices. To input and output information.

  In addition to the RAM 22 and the ROM 23, the information processing unit 20 may include an external storage device for storing a temporary work area and necessary data. The CPU 21, RAM 22, ROM 23, and I / O unit 24 are connected to each other by an internal bus 26, and can transmit information to each other.

  In the information processing unit 20, the function acquisition unit 210, the display control unit 220, the operation reception unit 230, the switching determination unit 240, the change unit 250, the function storage area 2610, and the setting storage area 2620 are set by the above physical configuration. Function as the storage unit 260. The function of each unit of the information processing unit 20 will be described later.

  The touch panel 30 includes a display unit 310 configured from a display device such as a liquid crystal display, and a sensor unit 320 superimposed on the display unit 310. In the present embodiment, a sensor capable of determining multi-touch, such as a capacitive touch sensor, is used for the sensor unit 320. With such a configuration, the touch panel 30 displays a screen according to an instruction from the information processing unit 20. Further, the touch panel 30 detects a user operation on the displayed screen and transmits the detected operation to the information processing unit 20.

  Next, processing executed by the scientific calculator 1 will be described with reference to a flowchart. When the user presses the button corresponding to the setting operation in the input unit 10, the scientific calculator 1 starts the setting process illustrated in FIG. 3.

In the setting process, the CPU 21 first displays a setting screen as shown in FIG. 4 on the display unit 310 (step S101). In the example of FIG. 4, the function of the scientific calculator 1 can be switched between valid / invalid by the user setting / unsetting the radio button. When the radio button “automatically switch between logarithmic axis and linear axis” in FIG. 4 is checked, the function of automatically switching the coordinate axis of the graph from the linear axis to the logarithmic axis becomes effective. In this case, it is possible to further set whether or not to display the switched graph and the non-switched graph at the same time.
On the other hand, when “Do not automatically switch” is checked, the switching function is disabled.

  The CPU 21 determines whether or not a setting operation using the setting screen displayed next has been received (step S102). If it has not been received yet (step S102; No), step S101 is repeated until the user performs a setting operation.

  For example, if the user touches the confirmation button after operating the radio button in FIG. 4, it is determined that the setting operation has been accepted (step S102; Yes). In this case, the CPU 21 stores the received setting content in the setting storage area 2620 set in the storage unit 260 (step S103). The setting information stored in the setting storage area 2620 is referenced / overwritten from each unit of the information processing unit 20. Then, the setting process ends.

  Based on the setting information stored in advance in this way, the scientific calculator 1 controls the graph display. The scientific calculator 1 starts the graph display process shown in FIG. 5 when the button for instructing the graph display of the function in the input unit 10 is pressed. In each unit of the information processing unit 20 illustrated in FIG. 1 (the function acquisition unit 210, the display control unit 220, the operation reception unit 230, the switching determination unit 240, the change unit 250, and the storage unit 260), the CPU 21 executes the processing of FIG. However, for the sake of convenience, each unit will be described as a subject of processing.

  In the graph display process, first, the function acquisition unit 210 acquires a function to be displayed in a graph (step S201). The function acquisition unit 210 may acquire a function designated by a user's key operation using the input unit 10, or may read a function stored in advance in the function storage area 2610.

  Next, the display control unit 220 acquires setting information for displaying the acquired function (step S202). In the present embodiment, the default display setting stored in the setting storage area 2620 of the storage unit 260 is acquired. Here, a case where setting information specifying that the function y (x) having x as a variable is drawn on a graph having both the x-axis and the y-axis as linear axes will be described. Note that the default setting is stored at the time of factory shipment, and may be set by the user using the input unit 10.

  Next, the display control unit 220 displays the function acquired in step S201 as a graph with the display settings acquired in step S202 (step S203). As described above, the display control unit 220 generates the graph of the function acquired in step S201 on coordinates where at least one of the plurality of coordinate axes (in this example, two of the y-axis and the x-axis) is a linear axis. And displayed on the touch panel 30 as a display device.

  Next, based on the information transmitted from the sensor unit 320, the operation reception unit 230 determines whether or not a touch operation on the displayed graph has been detected (step S204). When the touch operation is not detected (step S204; No), the process skips to step S210. On the other hand, when a touch operation is detected (step S204; Yes), the operation reception unit 230 refers to the setting information stored in the setting storage area 2620 to determine whether or not the switching function is valid ( Step S204A). For example, if the setting information stored in step S103 in FIG. 3 specifies that the switching function is not valid (step S204A; No), the processing is skipped to step S210.

  On the other hand, when it is designated that the switching function is valid (step S204A; Yes), the operation receiving unit 230 next determines whether or not the touch operation is a pinch out that moves so that two fingers are separated. (Step S205).

  If it is determined in step S205 that it is a pinch out (step S205; Yes), the operation reception unit 230 starts the display area enlargement process shown in FIG. 6 (step S206).

  In the display area expansion process, first, the operation reception unit 230 calculates the amount of change in pinch out (step S301). For example, it is assumed that two fingers are at the positions (X1, Y1) and (X2, Y2) at the start time of the pinch out, and moved to (X1 ′, Y1 ′) and (X2 ′, Y2 ′) at the end time. (FIG. 9A). As a change amount of the X axis, a ratio drX of the distance between the two fingers at the start time (X1−X2) and the distance at the end time (X1′−X2 ′) is calculated (formula (1)). Similarly, the change amount drY of the Y axis is also calculated by the following equation (2).

drX = (X1′−X2 ′) / (X1−X2) (1)
drY = (Y1′−Y2 ′) / (Y1−Y2) (2)

  Next, the switching determination unit 240 determines a display range of a new graph that is changed by the pinch out (step S302). For example, if y before update is displayed from the maximum value YH to the minimum value YL, the display range of the Y axis after update may be set to the minimum value Ymin = YL × drY to the maximum value Ymax = YH × drY. . As shown in FIG. 9A, when Y is displayed from YL = −5 to YH = + 5, when 18 times pinch-out is executed (drY is 18), display of the updated Y axis The range is −90 to +90 (FIG. 9B). Similarly, regarding the X axis, if x before update is displayed from the maximum value XH to the minimum value XL, the display range of the X axis after update is from the maximum value Xmax = XH × drX to the minimum value Xmin = XL × drX. To be determined.

  Note that the determination method in steps S301 and S302 is not limited to the above example. For example, not only in the above formulas (1) and (2), each time a dot is pinched out, the enlargement ratio is set to 1%. The display range may be determined. If the origin is not the center, the updated display range is set with the center of the current display range as the center of enlargement.

  Next, the switching determination unit 240 is configured to display a function value (Y value) or a variable (X value) on a plurality of coordinate axes (X axis and Y axis) of the graph in the updated display range. It is determined whether or not the difference exceeds a predetermined threshold (for example, 100 times). Specifically, the ratio rY = (Xmax−Xmin) / (Ymax−Ymin) between the range (Ymax−Ymin) in which the function value y is displayed and the range (Xmax−Xmin) in which the variable x is displayed is first set. calculate. Then, it is determined whether or not the ratio rY is greater than 100: 1 (S303).

  If the display range of the Y axis is more than 100 times the threshold value compared to the display range of the X axis, that is, the ratio rY100: 1 is larger (step S303; Yes), whether or not the Y axis is switched from the linear axis to the logarithmic axis. It becomes the judgment object.

  If it is determined Yes in step S303, the switching determination unit 240 determines whether a function is drawn with y> 0 in the entire changed display range (step S304). For example, when the acquired function y (x) = 10 ^ x, y> 0 regardless of the display range of x. On the other hand, when the function y (x) = x, when the display range of x is x> 0, the entire display range is y> 0, but when x ≦ 0 is included in the display range. Is not y> 0 in the entire display range.

  If it is determined that the function is drawn at y> 0 in the entire changed display range (step S304; Yes), it can be determined that one switching condition is satisfied, so whether the next switching condition is satisfied in step S305. Determine whether or not. Thus, if the variable range of y = f (x) is set to Xmin ≦ x ≦ Xmax, and y (x)> 0 is satisfied for all x in the variable range, it can be determined that the switching condition for step S304 is satisfied.

  If it is determined that the function is not plotted at y> 0 in the entire changed display range (step S304; No), it is determined not to switch to the symmetry axis about the y axis, and the process skips to step S313.

  In step S305, the switching determination unit 240 determines whether or not a function is depicted in a portion where y> Ymax in the changed display range of the x axis (coordinate axes that are not to be determined) (step S305). That is, it is one of the conditions for determining that the function is swung in the positive direction of the y-axis to switch to the logarithmic axis. If the value of y using the changed x-axis display range (Xmin to Xmax) as the variable range falls within the range of Ymax or less (if the range is y ≦ Ymax), the function is drawn in the y> Ymax part. It is determined that it is not performed (step S305; No). In this case, since this condition is not satisfied, it is determined not to switch to the symmetry axis with respect to the y axis, and the process skips to step S313.

  On the other hand, if there is a value larger than Ymax in the value of y having the changed x-axis display range (Xmin to Xmax) as the variable range (the range does not fall within y ≦ Ymax), a function is added to the portion where y> Ymax. Is plotted (step S305; Yes). In this case, since the switching condition in step S305 is satisfied, the process proceeds to step S306 to determine the next condition. Satisfying this switching condition is equivalent to satisfying y (x)> 0 for any x in the variable range, where the variable range of y = f (x) is Xmin ≦ x ≦ Xmax.

  In step S306, the switching determination unit 240 determines whether or not the Y axis is currently displayed as a linear axis (step S306). If it is not a linear axis (in the case of a logarithmic axis) (step S306; No), it is meaningless to switch to the logarithmic axis, and the process proceeds to step S313. On the other hand, if it is a linear axis (step S306; Yes), the Y axis is switched to the logarithmic axis in step S307 (FIG. 9C). The switched graph is newly displayed in step S313 described later.

  In step S307, the visibility of the graph may be improved by further changing the display range of the Y axis to a position divisible by the logarithm base (for example, 10). For example, if the base of the logarithm is 10 (natural logarithm), the upper and lower limits of the Y-axis display range are changed to good values such as 1, 10, 100,.

  Returning to step S303, if the ratio of the y-axis: x-axis display area is 100: 1 or less (step S303; No), the switching determination unit 240 determines whether to switch the x-axis to the logarithmic axis. . First, the switching determination unit 240 determines whether or not the x-axis: y-axis is larger than the threshold of 100: 1 (the x-axis display area is larger than 100 times the y-axis) (step S308). If the ratio of the X axis to the Y axis is equal to or less than the threshold value of 100: 1 (step S308; No), it is determined not to switch the X axis to the logarithmic axis, and the process skips to step S313. On the other hand, when larger than 100: 1 (step S308; Yes), the switching determination unit 240 determines whether or not x> 0 in the entire display range, similarly to step S304 (step S309). For example, when the display range of the x axis (the variable range of f (x) to be displayed) is 1 <x <100 in the updated display range, it is determined that x> 0 in the entire display range ( Step S309; Yes), the process proceeds to the determination process of step S310. On the other hand, if x> 0 is not satisfied in the entire display range, it is determined that the X axis is not switched to the logarithmic axis (step S309; No), and the process skips to step S313.

  Next, similarly to step S305, the switching determination unit 240 determines whether or not a function is plotted in a portion where x> Xmax in the changed display range of the y-axis (coordinate axes that are not to be determined) (step S310). . If the function has been swung out in the positive direction of the x-axis in the updated display range, it is determined that the function is plotted in the portion of x> Xmax (step S310; Yes), and the process proceeds to step S311. . On the other hand, if it has not been shaken, it is determined that the function is not plotted in the portion of x> Xmax (step S310; No), and the process proceeds to step S313 as it is. In this case, the x axis cannot be switched to the logarithmic axis.

  In step S311, the switching determination unit 240 determines whether the x-axis is currently displayed as a linear axis (step S311). If it is not a linear axis (step S311; No), it is meaningless to switch to the logarithmic axis, and the process proceeds to step S313. On the other hand, if it is a linear axis (step S311; Yes), it is determined in step S312 that the X axis is switched to the logarithmic axis.

  Similar to step S307, the visibility of the graph may be improved by further changing the display range of the x-axis to a position divisible by the logarithm base in step S312.

  In step S <b> 313, the changing unit 250 causes the touch panel 30 to display a graph with the display range changed (enlarged) using the display control unit 220. At this time, the graph is displayed after changing the y-axis when step S307 is executed and changing the x-axis when step S312 is executed from a linear axis to a logarithmic axis.

  When step S313 ends, the display area enlargement process ends. Returning to FIG. 5, after step S206 is completed, the process then moves to step S209. On the other hand, when it is determined in step S205 that the touch operation is not a pinch-out (step S205; No), the operation reception unit 230 determines whether the touch operation is a pinch-in that moves so that two fingers approach each other. (Step S207).

  If it is determined in step S207 that it is a pinch-in (step S207; Yes), the operation reception unit 230 starts the display area reduction process shown in FIG. 7 (step S208).

  In the display area reduction process, the operation receiving unit 230 calculates the amount of pinch-in change (step S401) and determines a new display range after the change (step S402), as in steps S301 and S302 of FIG. By executing the processing of steps S205, S301, S207, and S401, the operation reception unit 230 exhibits a function of receiving a change instruction for changing the display range of the function in the graph.

  Then, contrary to step S303, in the display range after the change determined in step S402, the switching determination unit 240 has a ratio of the y axis to the x axis (y axis: x axis) that is a predetermined threshold 100: 1. It is determined whether or not it is below (step S403). If 100: 1 or less (step S403; Yes), it is determined whether or not the Y axis is currently displayed as a logarithmic axis (step S404). If it is not a logarithmic axis (step S404; No), it is meaningless to switch to the linear axis, and the process proceeds to step S409. On the other hand, if it is a logarithmic axis (step S404; Yes), the y axis is switched to the linear axis in step S405. The switched graph is newly displayed in step S409 described later.

  Returning to step S403, if the ratio of y-axis: x-axis is greater than 100: 1 (step S403; No), the switching determination unit 240 determines whether to switch the x-axis to the linear axis. First, the switching determination unit 240 determines whether or not the x-axis: y-axis is equal to or less than the threshold of 100: 1 (step S406). If the ratio of the x-axis to the y-axis is equal to or less than the threshold value of 100: 1 (step S406; No), it is determined that the x-axis is not switched to the linear axis, and the process skips to step S409.

  On the other hand, if it is less than 100: 1 (step S406; Yes), the switching determination unit 240 determines whether or not the x-axis is currently displayed as a logarithmic axis (step S407). If it is not a logarithmic axis (step S407; No), since it is meaningless to switch to the linear axis, the process proceeds to step S409. On the other hand, if it is a logarithmic axis (step S407; Yes), the x-axis is switched to the linear axis in step S408. The switched graph is newly displayed in step 409 described later.

  In step S409, the change unit 250 causes the touch panel 30 to display a graph with the display range changed (reduced) using the display control unit 220. At this time, the graph is displayed after changing the Y axis when step S405 is executed and the X axis when step S408 is changed from a logarithmic axis to a linear axis.

  When step S409 ends, the display area reduction process ends. Returning to FIG. 5, when step S206 or S208 ends, the changing unit 250 starts the simultaneous display process shown in FIG. 8 (step S209).

  In the simultaneous display process, first, the changing unit 250 determines whether or not the coordinate axis is switched between the linear axis and the logarithmic axis in step S206 or S208 in FIG. 5 (step S501). If not switched (step S501; No), the simultaneous display process is terminated.

  On the other hand, when switching has been performed (step S501; Yes), the changing unit 250 refers to the setting information stored in the setting storage area 2620, and is set to “display simultaneously” in the setting process of FIG. It is determined whether it has been (step S502). If the simultaneous display setting is not valid (step S502; No), the simultaneous display process is terminated.

  When the simultaneous display setting is valid (step S502; Yes), in addition to the graph in which the coordinate axis is switched between the linear axis and the logarithmic axis, the coordinate axis is switched from the linear axis to the logarithmic axis, or from the logarithmic axis to the linear axis. A graph in which only the display range is changed is displayed at the same time (step S503).

In step S503, the graph in which the coordinate axis is switched between the linear axis and the logarithmic axis and the switched coordinate axis (for example, black) are displayed in the same color. Further, a graph in which only the display range is changed without switching is also displayed in the same color as the coordinate axis that has not been switched (a color different from the switched graph, for example, red) (FIG. 10B).
According to such a configuration, the user can select a desired graph by comparing the graph in which the coordinate axis is automatically switched between the linear axis and the logarithmic axis and the graph in which the coordinate axis is not switched without requiring a complicated operation. Can be displayed. Further, by color-coding the graph and the coordinate axis displayed at the same time, it is possible to determine which is the same even if the two coordinate axes and the graph are displayed simultaneously.
Although the graph in which the coordinate axes are switched and the graph in which the switching has not been performed are overlapped and displayed here, they may be displayed side by side as separate graphs.

Returning to FIG. 5, whether step S209 ends, whether it is determined in step S204 that no touch operation is detected (step S204; No), whether it is determined in step S204A that the switching function is not valid (step S204A; No), If it is determined in step S207 that it is not a pinch-in (step S207; No), the information processing section 20 performs other processing (step S210). The other process is a process for executing a function of the scientific calculator 1 different from the display / update of the graph, such as interruption of the graph display or execution of the calculation function.
When step S210 ends, the information processing unit 20 returns to step S203 to display a graph and waits for the next touch operation.

  Through the processing described above, the scientific calculator 1 provides the user with functions as shown in FIGS. 9 and 10, for example. For example, it is assumed that the function y (x) = 10 ^ x is input for graph display. In response to this, the function is drawn (plotted) on a graph with the x-axis and y-axis being linear axes in the default display range as shown in FIG. On the other hand, when pinching out in the vertical direction so as to enlarge the y-axis, the display range of the y-axis is automatically enlarged and displayed as shown in FIG.

  In FIG. 9B, since the y-axis display range is −100 to +100 and the x-axis display range is −8 to +8, it is determined No in steps S303 and S308 in FIG. The axes are displayed as they are without being switched to logarithmic axes.

  If pinch out is further performed in the state of FIG. 9B and the display range of the Y axis exceeds 100 times the X axis, the Y axis is converted to a logarithmic axis as shown in FIG. 9C. As a result, it is possible to display a graph in which the relationship between the variable x and the function value y can be easily confirmed even when there is a large difference in display area, such as exceeding 100 times between the X axis and the Y axis without requiring complicated operations. I can do it. If the automatic switching function is disabled in the setting process of FIG. 3, the Y axis is displayed as a linear axis as shown in FIG. 9D. In this case, since the display ranges of the two axes are significantly different, it is difficult to grasp the shape of the function curve. However, always switching automatically is inconvenient if you want to use a graph with a linear axis. Therefore, convenience is ensured by enabling the automatic switching function in normal times and disabling the function when unnecessary.

  Also, in the state where the simultaneous display function is enabled in the setting process of FIG. 3, if the switching condition is satisfied by pinching out before switching (FIG. 10A), the logarithmic axis is changed as shown in FIG. 10B. And the graph with the linear axis are displayed at the same time. Further pinching out in this state expands the display range of the logarithmic axis (FIG. 10C).

  As described above, the scientific calculator 1 according to the present embodiment displays a graph in which at least one of a plurality of coordinate axes such as the x axis and the y axis, on which the function acquired by the function acquisition unit 210 is drawn, is a linear axis. The unit 220 causes the touch panel 30 to display. Then, the operation reception unit 230 receives a touch operation (pinch-in / pinch-out) as a change instruction for changing the display range of the displayed graph, and changes the display range. Here, in the display range to be updated, whether the difference between the range in which the variable x is displayed on the x axis and the range in which the function value y is displayed on the y axis exceeds a predetermined difference (for example, 100 times) If it is determined that it has exceeded, the switching determination unit 240 determines to switch one to the logarithmic axis. Then, the change unit 250 switches the larger linear axis to the logarithmic axis, and then displays the graph with the display range changed on the touch panel 30.

  According to such a configuration, when the difference between the values of variables and functions displayed between the coordinate axes of the graph becomes large and it becomes difficult to understand the relationship between the numerical values, it becomes a semilogarithmic graph that is easy to see without the need for complicated operations. Can be changed. Therefore, convenience for the user is increased.

  Further, a touch panel is adopted as a display device and an operation receiving means. Therefore, the graph display range can be enlarged or reduced by an intuitive operation such as pinch-out and pinch-in. On the other hand, an operation using a touch panel lacks certainty, and in many cases, enlargement or reduction is excessive than the user's intention, resulting in a meaningless graph in which a difference in curves is difficult to read. Therefore, the scientific calculator 1 is configured to use a touch panel, and when the difference in the display range of the function axis becomes large, by automatically switching to the logarithmic axis, the ratio of displaying a meaningless graph is reduced to reduce the touch panel. Covers the weaknesses of

  Furthermore, when a graph in which the linear axis is switched to the logarithmic axis is displayed, the graph in which the display range is changed without switching the linear axis to the logarithmic axis as shown in FIGS. 10B and 10C by the simultaneous display processing. Further (at the same time) display. With such a configuration, it is possible to easily compare the case where automatic switching is performed with the case where automatic switching is not performed, and thus the convenience for the user can be further improved.

  In addition, among the multiple coordinate axes of the graph, a linear axis whose displayed range exceeds a predetermined threshold value than the other coordinate axes is switched to a logarithmic axis, so that a coordinate axis having a large display range can be selectively selected without requiring a complicated operation. You can switch to the logarithmic axis.

  Also, when deciding whether to convert to a logarithmic axis, in the updated display range, the linear axis (coordinate axis to be switched) that is larger than the other coordinate axes and exceeds a predetermined threshold is outside the display range, but is displayed on the other coordinate axes When a function is drawn in a region within the range, the linear axis is switched to the logarithmic axis. Even if the difference in display range between coordinate axes increases, if the graph does not swing in the positive direction, the ratio of the function shape in the graph is high. According to such a configuration, the logarithmic axis can be automatically converted to a linear axis only when the necessity is high according to the shape of the graph, so that unnecessary conversion can be avoided and user convenience can be improved. .

  Furthermore, when switching to the logarithmic axis, if the displayed range is larger than the other coordinate axes and exceeds the predetermined threshold, it is determined that the linear axis is switched to the logarithmic axis, so that negative values that cannot be converted to logarithm are not included It can be converted to logarithmic axis only. For this reason, the error which arises by calculating a negative logarithm can be prevented.

In addition, when a graph in which at least one of the plurality of coordinate axes is a logarithmic axis is displayed, the switching determination unit 240 displays the function on the plurality of coordinate axes of the graph in the display range updated by the received update instruction. It is determined whether or not the difference in the range in which the value y or the variable x is displayed is equal to or less than a predetermined threshold, and based on the determination result, it is determined whether or not the coordinate axis of the graph is switched from the logarithmic axis to the linear axis. If it is determined to switch to the linear axis, the changing unit 250 switches the logarithmic axis to be dealt with to the linear axis, and then displays the graph with the display range changed on the touch panel.
According to such a configuration, a graph once changed to the logarithmic axis can be easily returned to the linear axis. Therefore, user convenience is high.

(Modification)
As mentioned above, although Embodiment 1 of this invention was demonstrated, embodiment of this invention is not restricted to this.
For example, in the first embodiment, a process of switching from a linear axis to a logarithmic axis is performed when a pinch-out operation is received, and a process of switching from a logarithmic axis to a linear axis is performed when a pinch-in operation is received. . The configuration is not limited to this, and a process of switching from a logarithmic axis to a linear axis when a display range enlargement instruction (pinch-in) is received, or from a linear axis to a logarithmic axis when a reduction instruction (pinch-in) is received A configuration for executing the switching process is also effective. For this purpose, the area enlargement process and the display area reduction process are not distinguished from each other, and all of the non-overlapping processes in FIG. 6 and FIG.
For example, when one of the two coordinate axes (for example, the x axis) is displayed with a logarithmic axis and the other (for example, the y axis) is displayed with a linear axis, the logarithmic axis (x axis) is not only reduced but linear In some cases, the axis (y-axis) is enlarged and the difference between the two display ranges is less than 100 times. Alternatively, there may be a case where the difference between the display ranges exceeds 100 times as a result of greatly reducing one of them in a linear axis state. According to the configuration of this modification, the logarithmic axis and the linear axis can be flexibly switched even in such a case.

  In the above embodiment, the touch panel is described as an example of the means for accepting the enlargement / reduction operation. However, the present invention is not limited to this, and a configuration using any input receiving means that can change the display range of the graph, such as character input or mouse operation, can be used instead.

  Note that the present invention can be provided as the scientific calculator 1 according to the first embodiment or a modification thereof, and a general-purpose computer such as an existing personal computer can also function as the scientific calculator 1 by applying a program. That is, by applying a graph display control program for realizing each functional configuration by the scientific calculator 1 so that an existing computer (such as a CPU) that controls the display device can be executed, the first embodiment or the modification example It can be made to function as the scientific calculator 1 concerning.

  The distribution method of such a program is arbitrary. For example, the program can be stored and distributed on a recording medium such as a memory card, a CD-ROM (Compact Disc Read Only Memory), or a DVD-ROM (Digital Versatile Disc Read Only Memory). It can also be distributed via a communication medium such as the Internet.

Various embodiments and modifications of the present invention are possible without departing from the broad spirit and scope of the present invention. That is, although several embodiments of the present invention have been described, the above-described embodiments are for explaining the present invention and do not limit the scope of the present invention. The scope of the present invention includes the invention described in the scope of claims and its equivalents, not the embodiments.
The invention described in the scope of claims of the present application is appended below.

(Appendix 1)
A display control means for generating a graph based on the function on coordinates where at least one of the plurality of coordinate axes is a linear axis, and displaying the display on a display device;
Accepting means for accepting a change instruction to change the display range of the graph;
In the display range changed by the received change instruction, it is determined whether or not the difference between the display ranges corresponding to the plurality of coordinate axes of the graph exceeds a predetermined threshold, and the coordinate axes of the graph are determined based on the determination result. Determining means for determining whether to switch from a linear axis to a logarithmic axis;
If it is determined to switch to the logarithmic axis, after changing the linear axis to the logarithmic axis, changing means for causing the display device to display a graph whose display range has been changed based on the change instruction;
A display control apparatus comprising:

(Appendix 2)
The display control means displays the graph on a touch panel,
The accepting means accepts a user touch operation on the touch panel as the change instruction,
The changing means changes a graph displayed on the touch panel.
The display control apparatus according to Supplementary Note 1, wherein

(Appendix 3)
In addition to the graph in which the linear axis is switched to the logarithmic axis, the changing means simultaneously displays a graph in which the display range is changed without switching the linear axis to the logarithmic axis.
The display control apparatus according to appendix 1 or 2, characterized in that:

(Appendix 4)
The determining means determines that, among the plurality of coordinate axes, the displayed range is switched to a logarithmic axis that is larger than the other coordinate axes and exceeds a predetermined threshold.
The display control device according to any one of appendices 1 to 3, wherein

(Appendix 5)
In the display range to be changed, the determination means is outside the display range for a linear axis that is larger than a predetermined threshold value than the other coordinate axes but is outside the display range, but for the other coordinate axes, the function is drawn in a portion within the display range. Determining to switch the linear axis to a logarithmic axis,
The display control apparatus according to Supplementary Note 4, wherein

(Appendix 6)
The determining means is configured to logarithmize the linear axis when the function is drawn on a portion of the linear axis that exceeds a predetermined threshold and exceeds 0 of the linear axis over the entire display range to be changed. Decide to switch to axis,
The display control apparatus according to appendix 4 or 5, characterized in that:

(Appendix 7)
When the graph having at least one logarithmic axis as a logarithmic axis is displayed, the determining unit is configured to display the function on the plurality of coordinate axes of the graph in the display range changed by the received change instruction. It is determined whether or not the difference in the range in which the value or variable is displayed is equal to or less than the predetermined threshold, and based on the determination result, it is determined whether or not to switch the coordinate axis of the graph from a logarithmic axis to a linear axis,
When the change unit determines to switch to the linear axis, the logarithmic axis is switched to the linear axis, and then the display control unit displays the graph with the display range changed based on the change instruction.
The display control device according to any one of appendices 1 to 6, characterized in that:

(Appendix 8)
A graph based on the function is generated on coordinates where at least one of the plurality of coordinate axes is a linear axis, and is displayed on a display device.
Accepting a change instruction to change the display range of the graph;
In the display range changed by the received change instruction, it is determined whether or not the difference between the display ranges corresponding to the plurality of coordinate axes of the graph exceeds a predetermined threshold, and the coordinate axes of the graph are determined based on the determination result. Decide whether to switch from linear axis to logarithmic axis,
If it is determined to switch to the logarithmic axis, after switching the linear axis to the logarithmic axis, to display a graph with the display range changed based on the change instruction on the display device,
A display control method characterized by the above.

(Appendix 9)
To the computer that controls the display device
Generating a graph based on a function on coordinates in which at least one of the plurality of coordinate axes is a linear axis, and displaying the graph on the display device;
A process of accepting a change instruction to change the display range of the graph;
In the display range changed by the received change instruction, it is determined whether or not the difference between the display ranges corresponding to the plurality of coordinate axes of the graph exceeds a predetermined threshold, and the coordinate axes of the graph are determined based on the determination result. Processing to determine whether to switch from linear axis to logarithmic axis,
When it is determined to switch to the logarithmic axis, after switching the linear axis to the logarithmic axis, a process for displaying on the display device a graph whose display range has been changed based on the change instruction;
A program for running

(Appendix 10)
Display means;
An input means for inputting a function;
A display control unit that generates a graph based on the input function on coordinates in which at least one of the plurality of coordinate axes is a linear axis, and causes the display unit to display the graph;
Accepting means for accepting a change instruction to change the display range of the graph;
In the display range changed by the received change instruction, it is determined whether or not the difference between the display ranges corresponding to the plurality of coordinate axes of the graph exceeds a predetermined threshold, and the coordinate axes of the graph are determined based on the determination result. Determining means for determining whether to switch from a linear axis to a logarithmic axis;
When it is determined to switch to the logarithmic axis, after changing the linear axis to the logarithmic axis, changing means for displaying on the display means a graph whose display range has been changed based on the change instruction;
A graph display device comprising:

DESCRIPTION OF SYMBOLS 1 ... Scientific calculator, 10 ... Input part, 20 ... Information processing part, 21 ... CPU, 22 ... RAM, 23 ... ROM, 24 ... I / O part, 26 ... Internal bus, 210 ... Function acquisition part, 220 ... Display control , 230 ... Operation accepting part, 240 ... Switching determination part, 250 ... Change part, 260 ... Storage part, 2610 ... Function storage area, 2620 ... Setting storage area, 30 ... Touch panel, 310 ... Display part, 320 ... Sensor part

Claims (9)

  An electronic device including a control unit,
  The controller is
  One of the two coordinate axes of the coordinates for which the graph is to be displayed is switched between a linear axis and a logarithmic axis, and the first coordinate in which one of the coordinate axes is switched and one of the coordinate axes cannot be switched. The first process for simultaneously displaying the second coordinates is automatically executed based on the difference between the display ranges of the two coordinate axes, or the first process is not executed regardless of the difference between the display ranges. Or accept settings,
  Determining whether to execute the first process based on the received setting;
  When it is determined to execute the first process, the second graph and the second graph on the second coordinate are displayed together with the first graph on the first coordinate and the first graph on the first coordinate. To display
Electronics.   The controller is
  Receiving an instruction to change a display range of at least one of the two coordinate axes of the coordinates;
  The first process is automatically executed based on the difference between the display ranges of the two coordinate axes of the coordinates after the change based on the instruction.
The electronic device according to claim 1.   An electronic device including a control unit,
  The controller is
  Accepting an instruction to change the display range of at least one of the two coordinate axes of the coordinates for which the graph is to be displayed,
  When the ratio of the display range of the other coordinate axis to the display range of one coordinate axis of the coordinate whose display range has been changed based on the instruction is greater than a threshold, the other coordinate axis is switched from a linear axis to a logarithmic axis, or The one coordinate axis is switched from a linear axis to a logarithmic axis when the ratio of the display range of one coordinate axis to the display range of the other coordinate axis of the coordinate whose display range is changed based on the instruction is larger than a threshold value. 2 process is executed
Electronics.   The controller is
  Accepting a setting as to whether or not to automatically execute the second process according to the display range of the two coordinate axes changed based on the instruction
The electronic device according to claim 3.   The controller is
  An instruction to change the display range of at least one coordinate axis of the coordinates is received by any of an operation on the touch panel, a character input, and a mouse operation.
The electronic device according to any one of claims 1 to 4. A display method executed by an electronic device including a control unit,
  One of the two coordinate axes of the coordinates for which the graph is to be displayed is switched between a linear axis and a logarithmic axis, and the first coordinate in which one of the coordinate axes is switched and one of the coordinate axes cannot be switched. The first process for simultaneously displaying the second coordinates is automatically executed based on the difference between the display ranges of the two coordinate axes, or the first process is not executed regardless of the difference between the display ranges. Or accept settings,
  Determining whether to execute the first process based on the received setting;
  When it is determined to execute the first process, the second graph and the second graph on the second coordinate are displayed together with the first graph on the first coordinate and the first graph on the first coordinate. To display
Display method including that.   A display method executed by an electronic device including a control unit,
  Accepting an instruction to change the display range of at least one of the two coordinate axes of the coordinates for which the graph is to be displayed,
  When the ratio of the display range of the other coordinate axis to the display range of one coordinate axis of the coordinate whose display range has been changed based on the instruction is greater than a threshold, the other coordinate axis is switched from a linear axis to a logarithmic axis, or The one coordinate axis is switched from a linear axis to a logarithmic axis when the ratio of the display range of one coordinate axis to the display range of the other coordinate axis of the coordinate whose display range is changed based on the instruction is larger than a threshold value. 2 process is executed
Display method including that.   To the computer that controls the display device,
  One of the two coordinate axes of the coordinates for which the graph is to be displayed is switched between a linear axis and a logarithmic axis, and the first coordinate in which one of the coordinate axes is switched and one of the coordinate axes cannot be switched. The first process for simultaneously displaying the second coordinates is automatically executed based on the difference between the display ranges of the two coordinate axes, or the first process is not executed regardless of the difference between the display ranges. Or accept the setting of
  Based on the received setting, it is determined whether to execute the first process,
  When it is determined to execute the first process, the second graph and the second graph on the second coordinate are displayed together with the first graph on the first coordinate and the first graph on the first coordinate. Display by part
Display program.   To the computer that controls the display device,
  An instruction to change the display range of at least one of the two coordinate axes of the coordinates for which the graph is to be displayed is received;
  When the ratio of the display range of the other coordinate axis to the display range of one coordinate axis of the coordinate whose display range has been changed based on the instruction is greater than a threshold, the other coordinate axis is switched from a linear axis to a logarithmic axis, or The one coordinate axis is switched from a linear axis to a logarithmic axis when the ratio of the display range of one coordinate axis to the display range of the other coordinate axis of the coordinate whose display range is changed based on the instruction is larger than a threshold value. 2 process is executed
Display program.

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