JP5521668B2 - Inequality display device and inequality display program - Google Patents

Description

The present invention relates to an inequality display device and an inequality display program.

  2. Description of the Related Art Conventionally, as a graphic display device that displays a graphic such as a graph, a device that can display a plurality of areas in the graphic in a monochrome manner is known (see, for example, Patent Document 1). In this graphic display device, for example, when a plurality of areas represented by different inequalities are displayed, each area is displayed in a different pattern. Therefore, a portion that simultaneously satisfies a plurality of inequalities, that is, an overlapping portion where a plurality of regions overlap is displayed as a range where the patterns of each region overlap.

  However, if the overlapping portions are simply displayed by overlapping the patterns of the respective areas, as shown in FIG. 14A, the overlapping portions can be identified when the number of overlapping portions is small, but FIG. ), As the number of overlapping portions increases, it becomes difficult to identify each overlapping portion.

  Therefore, it is conceivable to display a plurality of areas with different identification colors. In this case, each overlapping portion can be identified even when the number of overlapping portions is increased by displaying the overlapping portions using the intermediate colors of the identification colors of the respective overlapping regions.

Japanese Patent Publication No. 6-38250

  However, if the overlapping portion is displayed in the intermediate color as described above, the number of colors used is increased by the amount corresponding to the intermediate color, so that it is necessary to improve the hardware specifications so that a large number of colors can be displayed. As a result, the cost of the apparatus is increased and the power consumption is increased, which makes it unsuitable for use as a learning device (particularly, battery-driven type) that is used in a severely priced educational field.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inequality display device and an inequality display program capable of color-displaying an overlapping portion where a plurality of areas overlap without being requiring high-spec hardware.

The inequality display device according to the present invention is:
A display unit;
Inequality display means for displaying a plurality of inequalities on the display unit;
Area identifying means for associating each of the plurality of inequalities with identification colors for identifying the plurality of areas, respectively;
When there are overlapping portions in which at least two of the regions that are individually satisfied by the plurality of inequalities overlap each other and the number of overlapping regions is less than a predetermined number, the overlapping portions overlap. When the overlapping portion is displayed on the display unit in a pattern in which identification colors corresponding to each region are mixed, and the number of the regions is a predetermined number or more, the predetermined pattern using a color of a specific number or less is used. Overlapping part display control means for displaying the overlapping part on the display unit;
It is characterized by providing.

  According to the present invention, when the number of areas overlapping in the overlapping part is less than a predetermined number, the overlapping part is displayed in a pattern in which the identification colors corresponding to each area overlapping in the overlapping part are mixed, and the overlapping part is displayed. When the number of overlapping areas is equal to or greater than a predetermined number, the overlapping portion is displayed in a predetermined pattern using a color equal to or less than a specific number, so even if the number of overlapping portions is large, the intermediate color of each identification color All the regions and overlapping portions can be displayed only with the total number of colors of the number of identification colors used and the specific number. Therefore, it is possible to perform color display so that an overlapping portion where a plurality of areas overlap can be identified without requiring high-spec hardware.

It is a top view of the scientific calculator in this embodiment. It is a block diagram which shows the function structure of a scientific calculator. It is a flowchart which shows the flow of a figure display process. It is a flowchart which shows the flow of OR mode in a figure display process. It is a flowchart which shows the flow of the AND mode in a figure display process. It is a figure which shows the display content of the display in a figure display process. It is a figure which shows the display content of the display in a figure display process. It is a figure which shows the display content of the display in a figure display process. It is a figure which shows the display content of the display in a figure display process. It is a figure which shows the display content of the display in a figure display process. It is a figure which shows the display content of the display in a figure display process. It is a figure which shows the display content of the display in a figure display process. It is a figure which shows the display content of the display in a figure display process. It is a figure which shows the example of a display of the duplication part by the conventional graphic display apparatus.

  Hereinafter, an example of an embodiment according to the present invention will be described in detail with reference to the accompanying drawings. However, the scope of the invention is not limited to the illustrated examples.

[1.1 External configuration]
FIG. 1 is a plan view of a scientific calculator 1 which is an embodiment of a graphic display device according to the present invention.
As shown in this figure, the scientific calculator 1 includes an input key group 2 having an input key group and a display 3.

  The input key group 2 is a key group for receiving an input operation of a mathematical expression component such as a numerical value or an arithmetic symbol from a user or an instruction operation of various processes, and a plurality of keys each assigned a unique function. Has a key. In the present embodiment, the input key group 2 includes a numeric keypad 20, an operation symbol key 21, an EXE key 22, a DEL key 23, a cursor key 24, a shift key 25, a function key 26, and the like.

Among these, the numeric keypad 20 is a key for receiving a numerical value input operation, and the arithmetic symbol key 21 is a key for receiving various arithmetic symbol input operations.
The EXE key 22 is a key that receives an input operation of various processing execution instructions and determination instructions, and the DEL key 23 is a key that receives a deletion operation such as a numerical value or a calculation symbol displayed on the display 3.

The cursor key 24 is a key that is pressed when, for example, a cursor (not shown) indicating an editing target position or a selection target position is moved in a predetermined direction within the display 3. Input is possible in four directions.
The shift key 25 is a key that is pressed when switching between an AND mode and an OR mode, which will be described later, in a graphic display process (see FIG. 3), which will be described later.

  The function key 26 has a plurality of keys for receiving an instruction to execute a predetermined process. In this embodiment, the function key 26 is pressed when a graphic is displayed on the display 3 in a graphic display process (see FIG. 3) described later. Graphic display key 26a.

  The display 3 includes an LCD (Liquid Crystal Display), an ELD (Electronic Luminescent Display), etc. In addition to various figures such as characters, codes, mathematical formulas, calculation results, and graphs according to the operation of the input key group 2, Various data necessary for using the scientific calculator 1 are displayed.

[1.2 Functional configuration]
Next, the functional configuration of the scientific calculator 1 will be described.
FIG. 2 is a block diagram illustrating a schematic functional configuration of the scientific calculator 1.

  As shown in this figure, the scientific calculator 1 includes functions of an input unit 12, a display driver 13, a display unit 14, a ROM (Read Only Memory) 15, a RAM (Random Access Memory) 16, a CPU (Central Processing Unit) 11, and the like. Each functional unit is connected by a bus 10.

  The input unit 12 includes the input key group 2 described above, and outputs an operation signal corresponding to the pressed key to the CPU 11.

The display driver 13 controls the display unit 14 according to a display signal from the CPU 11.
The display unit 14 includes the display 3 described above, and displays various information on the display 3 under the control of the display driver 13.

  The ROM 15 is a non-volatile memory that stores various programs and various data. In the present embodiment, the graphic display program 150 and the identification color data 151 according to the present invention are stored. Among these, the graphic display program 150 is a program for causing the CPU 11 to execute graphic display processing (see FIG. 3) described later. On the other hand, the identification color data 151 stores a plurality of identification colors for identifying a plurality of areas on the display 3 together with individual identification numbers (natural numbers from 1) in a graphic display process (see FIG. 3) described later. In this embodiment, eight identification colors are stored.

  The RAM 16 is a volatile memory that temporarily stores information, and has a plurality of work areas that store various programs to be executed and data related to these various programs. For example, the RAM 16 in this embodiment has an inequality storage area 160 as a work area. In this inequality storage area 160, inequalities inputted by user operations are stored in the figure display process (see FIG. 3) to be described later, with input numbers in the input order.

  The CPU 11 centrally controls each part of the scientific calculator 1. Specifically, the CPU 11 develops a program designated from various programs stored in the ROM 15 in the RAM 16 and executes various processes in cooperation with the program.

[1.3 Operation of scientific calculator]
Next, the operation of the scientific calculator 1 in the graphic display process executed when a graphic is displayed on the display 3 will be described by taking an inequality graph as an example of the graphic.
FIG. 3 is a flowchart showing the flow of the graphic display process, FIG. 4 is a flowchart showing the flow of the OR mode described later in the graphic display process, and FIG. 5 shows the flow of the AND mode described later in the graphic display process. It is a flowchart to show.

  As shown in FIG. 3, in the graphic display process, first, the user operates the numeric keypad 20, the operation symbol key 21, and the like to input a plurality of inequalities (step S1). At this time, the CPU 11 stores the inequality in the inequality storage area 160 while assigning the input numbers in the input order to the input inequality.

  Next, the CPU 11 performs color display so that each area and each boundary line satisfying the plurality of inequalities can be identified by matching the input number of the inequalities in the inequalities storage area 160 with the identification numbers in the identification color data 151. As a color, an identification color is associated with each inequality. That is, the identification color is associated with each of the plurality of areas satisfied by each inequality (step S2). Then, the CPU 11 displays each inequality on the display 3 with the associated identification color.

Next, the user operates the shift key 25 to select either the OR mode or the AND mode (step S3).
Here, the OR mode is a mode for identifying and displaying all the regions that are satisfied by any of the input inequalities as a portion to be obtained. The AND mode is a mode for identifying and displaying only a region that is satisfied by all input inequalities simultaneously as a portion to be obtained.

  Next, when the graphic display key 26a is operated by the user and the graph display is executed (step S4), the CPU 11 determines whether or not the OR mode is selected in step S3 (step S5). If it is determined that it has been selected (step S5; Yes), graph display in the OR mode is executed (step S6).

  When the graph display in the OR mode is executed, as shown in FIG. 4, the CPU 11 assigns “1” to the number “n” for identifying each inequality (step S61).

  Next, the CPU 11 reads an inequality (hereinafter referred to as the nth inequality) whose input number is “n” from the inequality storage area 160, and sets the boundary line of the nth inequality as the identification number “n” corresponding to the nth inequality. "Is displayed on the display 3 with the identification color (hereinafter referred to as the nth identification color) (step S62). At this time, when the inequality sign of the nth inequality is “<” or “>”, the CPU 11 sets the boundary line with a line (here, a broken line; the same applies hereinafter) indicating that the region satisfied by the inequality is not included on the boundary line. When “≦” or “≧” is drawn, the boundary line is drawn with a line (here, a solid line; the same applies hereinafter) indicating that the region satisfied by the inequality is included on the boundary line. The width of the boundary line is 3 dots (pixels) of the display 3 by default, and can be switched to 1 dot or 5 dots depending on the setting.

  Next, the CPU 11 determines whether or not there is a non-overlapping portion N (see FIG. 7) that does not overlap with other displayed inequality areas among the areas satisfied by the nth inequality (hereinafter referred to as nth inequality areas). However, if it is determined that there is (step S63; Yes), this non-overlapping portion N is displayed in a checkered pattern in dot units of the nth identification color and white (step S64).

  If it is determined in step S63 that there is no non-overlapping portion N (step S63; No), or after step S64, the CPU 11 overlaps two displayed inequality areas including the nth inequality area. It is determined whether or not there is (see FIG. 7) (step S65), and if it is determined (step S65; Yes), checkerboard in dot units of two identification colors corresponding to these two inequality areas The overlapping portion A1 is displayed with a pattern (step S66).

  If it is determined in step S65 that there is no overlapping portion A1 (step S65; No), or after step S66, the CPU 11 overlaps the displayed three inequality areas including the nth inequality area A2 ( It is determined whether or not there is (step S67), and if it is determined (step S67; Yes), the three identification colors corresponding to these three inequality areas are in two orthogonal directions in units of dots. The overlapping portion A2 is displayed in a pattern arranged in a predetermined order (step S68).

  When it is determined in step S67 that there is no overlapping portion A2 (step S67; No), or after step S68, the CPU 11 overlaps four displayed inequality areas including the nth inequality area (overlapping part A3). 11) (step S69), and if it is determined (step S69; Yes), the four identification colors corresponding to these four inequality areas are within 2 × 2 dots. The overlapping portion A3 is displayed in a pattern in which the arranged blocks D (see FIG. 11) are arranged (step S70).

  When it is determined in step S69 that there is no overlapping portion A3 (step S69; No), or after step S70, the CPU 11 overlaps five or more displayed inequality regions including the nth inequality region. It is determined whether or not there is A4 (see FIG. 12) (step S71), and when it is determined that there is (step S71; Yes), black and white in block units with 2 × 2 dots as one block The overlapping portion A4 is displayed in a checkered pattern (step S72).

  If it is determined in step S71 that there is no overlapping portion A4 (step S71; No), or after step S72, the CPU 11 determines whether there is an undisplayed inequality (step S73). If it is determined that there is an undisplayed inequality (step S73; Yes), the CPU 11 sets the number “n” for identifying each inequality to “n + 1” (step S74), and then the above-described step. If the process proceeds to S62 and it is determined that there is no undisplayed inequality (step S73; No), the graphic display process in the OR mode is terminated.

  On the other hand, as shown in FIG. 3, when it is determined in step S5 that the OR mode is not selected (step S5; No), the CPU 11 executes graph display in the AND mode (step S8).

  When the graph display in the AND mode is executed, as shown in FIG. 5, the CPU 11 assigns “1” to the number “n” for identifying each inequality (step S81).

  Next, the CPU 11 reads out the nth inequality from the inequality storage area 160 and displays the boundary line of the nth inequality on the display 3 in the nth identification color (step S82). At this time, when the inequality sign of the nth inequality is “<” or “>”, the CPU 11 draws the boundary line as a broken line, and when “≦” or “≧”, the CPU 11 draws the boundary line as a solid line. The width of the boundary line is 3 dots (pixels) of the display 3 by default, and can be switched to 1 dot or 5 dots depending on the setting.

  Next, the CPU 11 displays an overlapping portion B (see FIG. 13) where the nth inequality area overlaps all displayed inequality areas in a checkered pattern in dot units of the nth identification color and white (step S83). .

  Next, the CPU 11 displays a portion other than the overlapping portion B displayed in step S83 in a colorless manner (step S84).

  Next, the CPU 11 determines whether or not there is an undisplayed inequality (step S85). If it is determined that there is an inequality (step S85; Yes), the CPU 11 determines the number “n” for identifying each inequality as “ After “n + 1” (step S86), the process proceeds to step S82 described above. On the other hand, if it is determined that there is no undisplayed inequality (step S85; No), the CPU 11 ends the graphic display process in the AND mode.

[1.4 Operation example]
Next, the operation of the scientific calculator 1 described above will be specifically described with reference to the drawings.
6 to 12 are diagrams showing display contents on the display 3 in the OR mode, and FIG. 13 is a diagram showing display contents on the display 3 in the AND mode.

(Operation example 1)
In the first operation example, a case will be described in which the overlapping portion A1 where two inequality areas overlap is displayed in the OR mode.
First, in the graphic display process, when the user operates the numeric keypad 20, the operation symbol key 21 and the like to input two inequalities “Y ≦ −X + 2” and “Y ≧ X + 2”, these two inequalities are converted into the first inequalities f1. And the second inequality F2 is stored in the inequality storage area 160 (step S1).

  Then, the two identification colors (first identification color c1 and second identification color c2) of the identification numbers “1” and “2” in the identification color data 151 are associated with the first inequality f1 and the second inequality f2. As shown in FIG. 6A, the first inequality f1 and the second inequality f2 correspond to the first identification color c1 (red in this operation example) and the second identification color c2 (blue in this operation example). Is displayed on the display 3 (step S2).

  Next, after the user operates the shift key 25 to select the OR mode (step S3) and then operates the graphic display key 26a (step S4), the graph display in the OR mode is executed (step S5; Yes, S6).

  Then, “1” is assigned to the number “n” for identifying each inequality (step S61), and as shown in FIG. 6B, the boundary line L1 of the first inequality f1 is the first identification color c1. A solid line is displayed in red (step S62).

  Next, the non-overlapping portion N1 in the first inequality area, that is, the entire area of the first inequality area is displayed in a checkered pattern in units of dots of the first identification color c1 and the white w (Step S63; Yes, S64).

  Next, since there are no overlapping portions A1 to A4 at this time (steps S65, S67, S69, S71; all are No), the number “n” is set to “2” as shown in FIG. 7 (step S73). Yes, S74), the boundary line L2 of the second inequality f2 that has not been displayed is displayed as a solid line in blue as the second identification color c2 (step S62).

  Next, the non-overlapping portion N2 that does not overlap the first inequality area in the second inequality area is displayed in a checkered pattern in units of dots of the second identification color c2 and white w (step S63; Yes, S64). .

Next, the overlapping portion A1 where the second inequality area overlaps the first inequality area is displayed in a checkered pattern in dot units of the second identification color c2 and the first identification color c1 (step S65; Yes, S66). .
Thus, the graphic display processing in the OR mode is completed (steps S67, S69, S71, S73; all are No).

(Operation example 2)
In the operation example 2, the case where the overlapping portion A2 in which the three inequality areas overlap is displayed in the OR mode will be described.
First, in the graphic display process, the user operates the numeric keypad 20, the operation symbol key 21 and the like to generate three inequalities “Y ≧ −3X + 6”, “Y ≧ −3X / 4 + 3”, and “Y ≧ −X / 10 + 3”. When input, these three inequalities are stored in the inequalities storage area 160 as the first inequalities f1 to f3 (step S1).

  Then, the three identification colors (first identification color c1 to third identification color c3) of the identification numbers “1” to “3” in the identification color data 151 are associated with the first inequality f1 to the third inequality f3. As shown in FIG. 8A, the first inequality f1 to the third inequality f3 are displayed with the corresponding first identification color c1 to third identification color c3 (red, blue, green in this operation example). Is displayed (step S2).

  Next, after the user operates the shift key 25 to select the OR mode (step S3) and then operates the graphic display key 26a (step S4), the graph display in the OR mode is executed (step S5; Yes, S6).

  Then, as shown in FIG. 8B, in the same manner as in the first operation example, “1” and “2” are sequentially assigned to the number “n” for identifying each inequality, and the boundary lines L1, L2 and , Non-overlapping portions N1 and N2 are displayed, and further, the overlapping portion A11 where the first inequality region and the second inequality region overlap is displayed in the overlapping portion A1 (steps S61 to S74, S62 to S66).

  Next, since there are no overlapping portions A2 to A4 at this time (Steps S67, S69, S71; all No), the number “n” is set to “3” (Step S73; Yes, S74), and FIG. As shown, the boundary line L3 of the third inequality f3 that is not displayed is displayed as a solid line in green as the third identification color c3 (step S62).

  Next, the non-overlapping portion N3 that does not overlap any of the first inequality area and the second inequality area in the third inequality area is displayed in a checkered pattern in dot units of the third identification color c3 and white w ( Step S63; Yes, S64).

  Next, the overlapping portion A12 where the third inequality area overlaps only the second inequality area is displayed in a checkered pattern in units of dots of the third identification color c3 and the second identification color c2 (step S65; Yes, S66). ). Although not present in the second operation example, when there is an overlapping portion A1 in which the third inequality region overlaps only the first inequality region, the overlapping portion A1 is the difference between the third identification color c3 and the first identification color c1. Displayed in a checkered pattern in dot units.

Next, in the third inequality area, the overlapping portion A2 that overlaps both the first inequality area and the second inequality area has three colors of the first identification color c1 to the third identification color c3 in two orthogonal directions in units of dots, respectively. They are displayed in a pattern arranged in a certain order (step S67; Yes, S68).
Thus, the graphic display process in the OR mode is completed (steps S69, S71, S73; all are No).

(Operation example 3)
In the operation example 3, a case will be described in which the overlapping portion A3 in which the four inequality areas overlap is displayed in the OR mode.
First, in the graphic display process, the user operates the numeric keypad 20, the operation symbol key 21, etc., and the four inequalities “Y ≧ −3X + 6”, “Y ≧ −3X / 4 + 3”, “Y ≧ −X / 10 + 3” and When “X ≧ 2” is input, these four inequalities are stored in the inequalities storage area 160 as the first inequalities f1 to f4 (step S1).

  The four identification colors (first identification color c1 to fourth identification color c4) of identification numbers “1” to “4” in the identification color data 151 are associated with the first inequality f1 to the fourth inequality f4. As shown in FIG. 10A, the first inequality f1 to the fourth inequality f4 are the corresponding first identification color c1 to fourth identification color c4 (red, blue, green, purple in this operation example). It is displayed on the display 3 (step S2).

  Next, after the user operates the shift key 25 to select the OR mode (step S3) and then operates the graphic display key 26a (step S4), the graph display in the OR mode is executed (step S5; Yes, S6).

  Then, as shown in FIG. 10B, in the same manner as in the above operation example 2, “1” to “3” are sequentially assigned to the number “n” for identifying each inequality, and the boundary lines L1 to L3 and The non-overlapping parts N1 to N3, the overlapping part A11 and the overlapping part A12 are displayed, and further, the overlapping part A21 where the first to third inequality areas overlap is displayed in the overlapping part A2 (steps S61 to S74, S62 to S74, S62 to S68).

  Next, since there are no overlapping portions A3 and A4 at this time (steps S69 and S71; both are No), the number “n” is set to “4” (step S73; Yes, S74), as shown in FIG. The boundary line L4 of the fourth inequality f4 that has not been displayed is displayed in a solid line in purple as the fourth identification color c4 (step S62).

  Next, the non-overlapping portion N4 that does not overlap any of the first to third inequality areas in the fourth inequality area is displayed in a checkered pattern in units of dots of the fourth identification color c4 and the white color w (step S63). ; Yes, S64).

  Next, the overlapping portion A13 where the fourth inequality area overlaps only the first inequality area is displayed in a checkered pattern in units of dots of the fourth identification color c4 and the first identification color c1 (step S65; Yes, S66). ).

  Next, in the fourth inequality area, an overlapping portion A22 that overlaps both the first inequality area and the second inequality area has three colors of the first identification color c1, the second identification color c2, and the fourth identification color c4 in dot units. Are displayed in a pattern arranged in a fixed order in two orthogonal directions (step S67; Yes, S68).

Next, a block D in which the overlapping portion A3 that overlaps all of the first to third inequality areas in the fourth inequality area has four colors of the first identification color c1 to the fourth identification color c4 arranged in 2 × 2 dots. Are displayed in an arrayed pattern (step S69; Yes, S70).
Thus, the graphic display processing in the OR mode is completed (steps S71 and S73; both are No).

(Operation example 4)
In the operation example 4, the case where the overlapping portion A4 where five inequality areas overlap is displayed in the OR mode will be described.
First, in the graphic display process, the user operates the numeric keypad 20, the operation symbol key 21 and the like, and the five inequalities “Y ≧ −1.5”, “Y ≧ −2.5”, “Y ≧ −0.5”. , “Y ≧ 0.5” and “Y ≧ 1.5”, these five inequalities are stored in the inequalities storage area 160 as the first inequalities f1 to f5 (step S1).

  Then, the five identification colors (first identification color c1 to fifth identification color c5) of the identification numbers “1” to “5” in the identification color data 151 are associated with the first inequality f1 to the fifth inequality f5. As shown in FIG. 12A, the first inequality f1 to the fourth inequality f5 are converted into the corresponding first identification color c1 to fifth identification color c5 (red, blue, green, purple, black in this operation example). ) Is displayed on the display 3 (step S2).

  Next, after the user operates the shift key 25 to select the OR mode (step S3) and then operates the graphic display key 26a (step S4), the graph display in the OR mode is executed (step S5; Yes, S6).

  Then, as in the above operation example 3, “1” to “4” are sequentially assigned to the number “n” for identifying each inequality, and the boundary lines L1 to L4, the non-overlapping portion N2, and the overlapping portion A1 are assigned. To A3 are displayed (steps S61 to S74, S62 to S74 are two loops, S62 to S70).

  Next, since there is no overlapping part A4 at this time (step S71; No), the number “n” is set to “5” (step S73; Yes, S74), and as shown in FIG. The boundary line L5 of the fifth inequality f5 that is the display is displayed as a solid line in black as the fifth identification color c5 (step S62).

Next, since the fifth inequality region is the overlapping portion A4 that overlaps with the first to fourth inequality regions in all regions (steps S63, S65, S67, S69; all No, S71; Yes), this overlapping portion A4 is A checkered pattern of black b and white w in units of 2 × 2 dots is displayed (step S72).
Thus, the graphic display process in the OR mode is completed (step S73; No).

(Operation example 5)
In the fifth operation example, a case will be described in which an overlapping portion A1 in which two inequality areas overlap is displayed in the AND mode.
First, in the graphic display process, when the user operates the numeric keypad 20, the operation symbol key 21 or the like to input two inequalities “Y <−X + 3” and “Y ≧ X ^ 2 + 1”, these two inequalities are the first. They are stored in the inequality storage area 160 as the inequality f1 and the second inequality f2 (step S1).

  Then, the two identification colors (first identification color c1 and second identification color c2) of the identification numbers “1” and “2” in the identification color data 151 are associated with the first inequality f1 and the second inequality f2. Then, the first inequality f1 and the second inequality f2 are displayed on the display 3 with the corresponding first identification color c1 and second identification color c2 (step S2).

  Next, after the user operates the shift key 25 to select the AND mode (step S3) and then operates the graphic display key 26a (step S4), the graph display in the AND mode is executed (step S5; No, S8).

  Then, “1” is assigned to the number “n” for identifying each inequality (step S81), and as shown in FIG. 13A, the boundary line L1 of the first inequality f1 is the first identification color c1. A broken line is displayed in a certain red color (step S82).

  Next, the overlapping part B1 where all the inequality areas overlap, that is, the entire area of the first inequality area is displayed in a checkered pattern in units of dots of the first identification color c1 and the white w (step S83), and the overlapping part B1 The other parts are displayed in colorless (step S84).

  Next, the number “n” for identifying each inequality is set to “2” (step S85; Yes, S86), and as shown in FIG. 13B, the boundary line L2 of the undisplayed second inequality f2 Is displayed as a solid line in blue as the second identification color c2 (step S82).

Next, the overlapping portion B2 where the first inequality area and the second inequality area overlap is displayed in a checkered pattern in units of dots of the second identification color c2 and white w (step S83), and other than the overlapping portion B2 The portion is displayed in colorless (step S84).
Thus, the graphic display process in the AND mode is completed (Step S85; No).

[1.5 Action and effect]
According to the above scientific calculator 1, as shown in steps S61 to S72 of FIG. 4, FIG. 7 to FIG. 12, etc., when the number of inequality areas overlapping in the overlapping portion is less than 5, this overlapping portion When the overlapping part is displayed in a pattern in which identification colors corresponding to each inequality area overlapping with each other are mixed, and the number of inequality areas overlapping in the overlapping part is five or more, a predetermined pattern using black and white In this case, the overlapping part is displayed, so even if the number of overlapping parts is large, all of the identification colors used and the total number of colors of black and white can be used without using intermediate colors of the identification colors. Inequalities and overlapping parts can be displayed. Therefore, it is possible to perform color display so that an overlapping portion where a plurality of inequality areas overlap can be identified without requiring high-spec hardware.
As a result, the cost of the apparatus and the increase in power consumption can be suppressed, so it is also suitable for learning equipment applications (especially those that are battery-driven) that are used in severe educational settings. Can be applied.

  Further, as shown in step S3 in FIG. 3 and the like, it is possible to select an OR mode that displays a portion that satisfies any of the plurality of inequalities and an AND mode that displays an overlapping portion B that satisfies all of the plurality of inequalities. Therefore, it is possible to understand at a glance how the inequality region or overlapping portion to be sought is geometrically configured by selecting a mode as necessary.

  The embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention.

  For example, the graphic display device according to the present invention has been described as the scientific calculator 1, but the one to which the present invention can be applied is not limited to the scientific calculator, and is a graphic of a mobile phone, a personal computer, a PDA (Personal Digital Assistant), a game machine, etc. Applicable to all display devices. The graphic display program 150 according to the present invention may be stored in a memory card or the like that can be attached to and detached from the scientific calculator 1.

  Further, although the graphic displayed on the display 3 has been described as an inequality graph, the graphic is not limited to the inequality graph, and may be a geometric graphic other than the inequality graph, a Venn diagram, or the like as long as it includes an overlap of a plurality of regions. May be.

  In addition, although the overlapping portion A4 has five or more overlapping regions, the lower limit of the number of regions is not limited to five. In an educational field where inequality is learned, learning is generally performed only up to the superposition of three inequality areas, and this is sufficient for general learning equipment applications without increasing the lower limit of the number of areas.

  In addition, although the overlapping portion A4 is displayed in a black and white checkered pattern, the overlapping portion A4 is not limited to this and may be displayed using a specific number of colors or less.

  Further, the display mode of the overlapping portion A4 is not limited to that of the above-described embodiment. For example, the overlapping mode A4 may be blinked, or a normal color as long as it does not require high-spec hardware. It may be filled with a dedicated fill color that cannot be set in the graph display.

In addition, the non-overlapping portion N is displayed in a checkered pattern of the nth identification color and white, but is not limited to white and may be in a range that does not require high-spec hardware. Anything is fine.
Further, the portion described as a dot (pixel) is not limited to the minimum display unit of the display 3, and a group of plural minimum display units of the display 3 may be a predetermined pixel unit.

  The colors corresponding to the inequalities are associated with the identification colors stored in the identification color data 151 according to the input order of the inequalities. However, the colors may be set freely by the user. Specifically, for example, when a user inputs an inequality, a color corresponding to the inequality may be selected.

1 Scientific calculator 2 Input key group 3 Display 11 CPU
12 Input unit 14 Display unit 15 ROM
16 RAM

150 Graphic display programs A1 to A4 Overlapping part D Block N Non-overlapping part c1 to c5 Identification color

Claims (7)

A display unit;
Inequality display means for displaying a plurality of inequalities on the display unit;
Area identifying means for associating each of the plurality of inequalities with identification colors for identifying the plurality of areas, respectively;
When there are overlapping portions in which at least two of the regions that are individually satisfied by the plurality of inequalities overlap each other and the number of overlapping regions is less than a predetermined number, the overlapping portions overlap. When the overlapping portion is displayed on the display unit in a pattern in which identification colors corresponding to each region are mixed, and the number of the regions is a predetermined number or more, the predetermined pattern using a color of a specific number or less is used. Overlapping part display control means for displaying the overlapping part on the display unit;
An inequality display device comprising: The overlapping part display control means is a predetermined pixel of the identification color and the fixed color corresponding to the area satisfying the one inequality for a non-overlapping part where the area satisfying one inequality does not overlap with the area satisfying another inequality. The inequality display device according to claim 1 , wherein the inequality display device is displayed in a checkered pattern in units. The overlapping portion display control means, when there are two overlapping regions in the overlapping portion, the overlapping in a checkered pattern in the predetermined pixel unit of the two identification colors corresponding to each region satisfied by the two inequalities The inequality display device according to claim 2 , wherein a portion is displayed. The overlapping part display control means is configured such that when the number of overlapping areas is three, the three identification colors corresponding to the areas satisfying the three inequalities are fixed in two orthogonal directions in units of the predetermined pixels. The inequality display device according to claim 3 , wherein the overlapping portion is displayed in a pattern arranged in the order of. The overlapping part display control means arranges the four identification colors corresponding to the areas satisfied by the four inequalities in the predetermined pixel 2 × 2 unit when the number of overlapping areas is four. The inequality display device according to claim 4 , wherein the overlapping portion is displayed in a pattern in which blocks are arranged. The overlapped part display control means, when the number of overlapping areas in the overlapped part is five or more, in a checkered pattern with a predetermined two colors in a block unit in which the predetermined pixel 2 × 2 unit is one block 6. The inequality display device according to claim 5 , wherein an overlapping portion is displayed. In a computer with a display,
An inequality display function for displaying a plurality of inequalities on the display unit;
An area identification function for associating each of the plurality of inequalities individually with an identification color for identifying the plurality of areas;
When there are overlapping portions in which at least two of the regions that are individually satisfied by the plurality of inequalities overlap each other and the number of overlapping regions is less than a predetermined number, the overlapping portions overlap. When the overlapping portion is displayed on the display unit in a pattern in which identification colors corresponding to each region are mixed, and the number of the regions is a predetermined number or more, the predetermined pattern using a color of a specific number or less is used. An overlapping part display control function for displaying an overlapping part on the display unit;
An inequality display program characterized by realizing