JPH01108671A - Mathematical formula input and edit system - Google Patents

Abstract

PURPOSE:To generate a mathematical formula with wide variety by enabling a face to be changed or the modification of a character to be designated, etc., in a mathematical formula input and edit device. CONSTITUTION:A means 407 to designate the arbitrary character or character string of the mathematical formula and a chemical formula designates the arbitrary character or character string by moving a cursor to the arbitrary character of the mathematical formula and the chemical formula and using a specific key or a soft key on a keyboard. A means 401 to designate an item to be changed designates the item to be changed by using the specific key or the soft key on the keyboard. It is decided whether or not the conversion processing of a designated character can be performed, and the conversion processing of the character is performed only when it is possible. Next, the size and the coordinate of each character string in the data of the mathematical formula are re-calculated automatically according to a hierarchical structure. In such a way, it is possible to generate the mathematical formula with wide variety.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to document creation devices such as Japanese word processors and personal computers, and particularly to a formula editing method suitable for creating and editing formulas.

[Conventional technology]

I'm going to growl. By managing the relationship between the constituent elements of these mathematical formulas, it was possible to automatically place input character strings at appropriate positions without the operator having to be aware of the character input position.

However, no consideration was given to the point that it would be possible to change the font, specify character decoration, etc. using the editing function for mathematical expressions input at -degrees.

[Problem that the invention seeks to solve]

The above-mentioned prior art does not take into consideration the fact that the characters or character strings in the mathematical formula are subjected to font change, nine-character modification, two-character conversion, etc. For example, draw an underline to the part of the formula you want to emphasize, 2 shade the character or character string you want to emphasize,
There was a problem that Gothic characters etc. could not be written.

The purpose of the present invention is to modify a specified range of characters or character strings in mathematical formulas by adding Angline, Gothic/Mincho, italic/pica, etc., and changing the font.

To provide a mathematical formula input/edit method that enables character conversion and creates a wide variety of mathematical formulas.

[Means for solving problems]

The above purpose is to provide means for specifying any character or character string of a mathematical formula/chemical formula, and means for specifying character conversion such as font switching, enlarged characters, etc. for any character or character string of the mathematical formula/chemical formula;・This is achieved by adding a means to automatically calculate and display the size and coordinates of each character string according to the hierarchical structure of the mathematical formula data after converting the specified characters or character strings of the chemical formula. .

[Effect]

To specify any character or character string in a mathematical formula/chemical formula, move the cursor to any character in the mathematical formula/chemical formula,
Specify any character or character string using a specific key or softkey on the keyboard. The means for specifying the conversion item is to specify the conversion item using a specific key or soft key on the keyboard. For the specified character,
It is determined whether character conversion processing is possible, and character conversion processing is performed only if it is possible. Next, it can be realized by automatically recalculating the size and coordinates of each character string according to the hierarchical structure of the mathematical data.

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to a word processor will be described with reference to the drawings.

The mathematical formula targeted by the present invention is shown in FIG. 3(a).

The characters that make up a mathematical formula are divided into regular characters and mathematical symbols. A mathematical symbol is a symbol that has a special meaning when used with numbers, and in Figure 3(a), it is Σ.

- (fractional bar), V, etc. A mathematical symbol (hereinafter referred to as a function symbol) has a character string attached to it, as in the denominator and numerator 2a in □ in FIG. 3(a), and has a meaning as a mathematical formula. The character string attached to this function symbol is called an argument, and the mathematical symbol and its argument together are called a function.

A number of these functions come together to form a mathematical expression. Also, the above argument may be a character string called car, but generally it is the third (a)
) In the figure: 1 k are included and form a hierarchical structure. The data of these formulas is stored in the storage device 402, and its format is as shown in FIG.
11. Y=Σ is stored in the form of characters such as =1, function symbols, and a delimiter 313 that identifies the hierarchical relationship. However, formulas have a hierarchical structure. Figure 3(C) shows the hierarchical structure of the formula in Figure 3(a). When displaying a formula, the formula data in Figure 3(b) is expanded according to the hierarchical structure and each character is Column dimensions and coordinates need to be calculated.

Next, the hardware configuration of the present invention will be explained. FIG. 4 is a diagram showing the equipment configuration of the present invention. The hardware to which the present invention is applied is an input device 401 such as a keyboard for inputting character strings, mathematical symbols, etc. A storage device 402 that stores character codes of input characters, a display device 403 such as a CRT display that displays character strings, etc. It is constituted by a control device 404 that controls each of the above-mentioned parts.

Of these, the control device 404 will be explained in detail.

The control device 404 includes a mathematical expression input section 405. Formula display section 40
69 Character string specification section 4o7. It is composed of four mechanisms of the formula editing section 408.

(1) Mathematical formula input section 405 As described above, a mathematical formula is composed of a collection of character strings and functions. A function is formed by a function symbol and arguments, but the number and display position of the attached arguments differ depending on the function symbol. Therefore, the formula input unit 405 has a table (hereinafter simply referred to as an argument table) that summarizes the number of attached functions for all function symbols.

When the user inputs a function symbol from the input device 401, the formula input unit 405 calculates the number of arguments attached to the input function symbol from the argument table, displays the function symbol on the display device 403, and displays the first Takes argument input,
The operator inputs a character string constituting an argument, and inputs a delimiter at the end of the argument to indicate that one argument has ended. The formula input unit 405 takes in input arguments for the number of arguments determined from the argument table, and the input formula symbols and argument 2 delimiters are arranged in a line in the order of input, as shown in FIG. 3(b). The information is stored in the storage device 402.

(2) Mathematical formula display section 406 In order to display mathematical formulas, instead of characters or lines with fixed sizes, two-dimensional areas of different sizes are basically used, and these are displayed according to the type of function symbol. They must be placed vertically or horizontally.

That is, it is necessary to set the size of an area (hereinafter referred to as an argument area) for each mathematical symbol and argument, and to arrange each argument at a fixed position depending on the type of function symbol. In this case, the method of arranging each function symbol is stored in the program.

This will be specifically explained using the following formula as an example.

Define the size of the above argument area as follows.

Σ=4engl x, length2 y (function symbol) i = 1 =4eng2 x, length2 y
(1st argument) E...4eng3 x, length
3 y (second argument) X i =4eng4 x,
length4 y (third argument) Also, each argument area has its own horizontal character string reference line (hereinafter referred to as the baseline), and this is set as base 1 , as above.
base・2.

Let bese3 and base4.

First, Σ, i=1. The size of the argument area for E and Xi is determined from the total width and maximum height of the characters included in each argument. If the argument is not input, the size is fixed (hereinafter referred to as the uninput area).

The baseline varies depending on the type of mathematical symbol, but String...String height Σ...(Length to the bottom of Σ/2) + (Normal character height/2) Fraction...Numerator tens Normal character height/2 Uninput argument: height of half-width characters shall be.

In the above formula, each baseline is basal
= (length y/2) + (normal character height/2)
base 2 = ], eng 2 ybase 3
= length 3 y base4 = length 4 y.

Next, change the above formula to Σ　　　　　・・・a i:1 Xi　　　　　　　　　...b Divide into 2 and calculate the size of each using the following formula.

length a x, = max(length 1 x, l
eng, 2 x, length 3 x) lenga
y = length y + length2 y + length
3 ylengb x = 1eng4 x length b y = 1eng4 y base a = length 3 y + base
1base b = length 2 y calculated a,
Based on the data of b, the position of each argument is set by arranging a and b so that each baseline coincides with the X direction (FIG. 5).

In the above processing, if there is a function among the arguments and the size of the argument cannot be determined, the size of the inner function is determined using the same procedure, and then the size of the argument is calculated.

If the hierarchical structure of the function is deeper, the process is repeated while performing recursive calls until the size of the argument to be determined is determined, and the size and coordinates of the argument are determined.

(3) Character string specification section 407 When a part of the mathematical expression displayed by the mathematical expression display section 406 is specified using the input device 401, the specified character or mathematical symbol is located in the data stored in the storage device 404. Search for

(4) Numerical formula editing section 408 Edits the characters or arguments obtained by the character string specifying section 407, such as insertion and correction.

The input method is the same as the character string input section, and the storage device 4
02, the re-input character string data is inserted into the specified character string position.

Next, in the apparatus comprising the above mechanism, the specific content of this embodiment is converted into a half-width character by converting the first argument of Σ in FIG. 2(a), 1, into a half-width character. Let's explain the case.

The conversion character range is determined by specifying the start and end positions of the character string to be converted using the cursor in the conversion character specification process 101 (
Figure 2(b)). This designation method may be from the start position to the end position or from the end position to the start position.

Next, in conversion item specification processing 102, switching from full-width to half-width is specified. It is determined whether the specified character can be converted using the specified conversion item (step 103), and character conversion processing is performed only if the character is convertible (step 1o4).
. In step 105, it is determined whether the converted characters are finished, and the above process is repeated until the designated characters are finished.

When the character or character string conversion process is completed, the numerical formula display process 106 automatically arranges and displays the characters as shown in FIG. 2(c).

Although this embodiment is an example of character conversion, it is clear that the present invention can also be applied to any character or character modification of a character string.

〔Effect of the invention〕

According to the present invention, it is possible to create a variety of mathematical expressions by making it possible to change the font, specify character decoration, etc., which were not considered in the mathematical expression input/editing device.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a flowchart of the present invention, and FIGS. 2(a) to 2(c) are diagrams showing the movement of the present invention on a screen. FIG. 3(a) shows an example of a mathematical formula handled by the present invention, FIG. 3(b) shows its data, and FIG. 3(c) shows its hierarchical structure. FIG. 4 shows a hardware configuration to which the present invention is applied. FIG. 5 shows how to obtain the display coordinates of a mathematical formula in the present invention. 101... Conversion character string specification step, 102... Conversion item specification step, 103... Character conversion possible determination step, 104... Character conversion processing step, 105.
. . . Conversion end determination step, 1.06 . . . Mathematical expression display processing step. Figure 1

Claims (1)

[Claims] 1. In a document creation device that displays document information on a display device and creates or edits and proofreads a document based on instructions from an input device, each character or character string unit such as a mathematical formula or chemical formula In a document creation device having a means for inputting character strings having a hierarchical relationship, a means for storing the hierarchical relationship, and a means for editing the mathematical formula/chemical formula inputted by the input means, Alternatively, for character strings, provide character conversion means such as switching between full-width and half-width, switching between italic font and pica font, specifying white characters, specifying enlarged characters, etc. A mathematical expression input/editing method that is characterized in that it is possible to arbitrarily select and set fonts, character transformations, enlarged characters, etc. 2. In claim 1, character modification designation means such as shading, underlining, etc. is provided for characters or character strings such as mathematical formulas, chemical formulas, chemical formulas, etc., and character modification designation means such as shading, underlining, etc.
A mathematical formula input/editing method characterized in that characters of a chemical formula or character modification of a character string can be arbitrarily selected and set.