JPH0778792B2 - Document creation device - Google Patents

Description

The present invention relates to a document creation device, and more particularly to a document creation device suitable for creating mathematical formulas and the like.

[Conventional technology]

Conventionally, as a document creation device that realizes mathematical expression input,
There is JStar made by Fuji Xerox. In this device, for example, It is possible to accept an input of a character string having a subordinate relationship to the display position, such as Σ, i = 1, n, X _{i in (} 1), and calculate and display the display position of each character string according to the subordinate relationship.

[Problems to be solved by the invention]

However, in the above-mentioned conventional device, no consideration has been given to the change of the character display position accompanying the correction of the content of the character string. That is, since the method of uniquely obtaining the coordinates of each character string by the program is adopted,
It was necessary to recalculate the display coordinates of all the character strings based on the dependency of the character strings when correcting the content of the character string display. Therefore, there is a problem that it takes time to perform coordinate calculation processing when correcting the contents of the character string.

An object of the present invention is to speed up the calculation accompanying the correction of the display contents of the character string.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention is a document creating apparatus which displays document information on a display device and creates or proofreads and edits a document according to an instruction from an input device. A means for inputting a character string group having, a means for displaying the character string group, a means for storing the subordinate relationship, and a means for correcting each character string of the character string group, Storage means for storing display coordinates for each column is provided, and each display coordinate of each character string is a coordinate of a character position at the head of a hierarchy formed for each character string. Each display coordinate is represented by relative coordinates according to the relationship between the character position of the head and each character and each character string, and when changing the content of the character string, the display coordinate and the relative coordinate Change at least one of It was done so.

The display coordinates of each character of the character string or each character string may be expressed by absolute coordinates based on a certain point on the display screen of the mathematical expression, but may also be expressed by relative coordinates according to the subordinate relationship. It may be

In the present specification, a "character string" is a set of characters,
A block of symbols, in some cases a single character,
Including symbols. Further, the “character string group having a subordination relationship between each character string” refers to a mathematical formula, a chemical formula, or the like in which the positional relationship of each character string and symbol is predetermined.

[Action]

Storage means for storing the display coordinates of the character string, for example,
The display device of the character string when the reference point on the document is set as the origin is divided into the x coordinate and the y coordinate and stored. When the content of the character string is changed, the new coordinates obtained based on the data before the change in the storage means are stored. When the character string is displayed again, it is displayed at the coordinates stored in the storage means, thereby simplifying the calculation of the character string display position.

Also, the method of expressing the coordinates of the character string is not expressed by the absolute coordinates based on a fixed point on the document, but by the relative coordinates according to the subordination relation of the character string, the amount of data is reduced. Become. In this case, the character string dependency is, for example, a mathematical formula , The relationship between Σ and i = 1, n, X _i , and so on.

〔Example〕

An embodiment in which the present invention is applied to a word processor will be described below with reference to the drawings.

FIG. 2 is a device configuration diagram of the present invention. In FIG. 2, the processing device 201 is, for example, a microprocessor,
The program stored in the program memory 204 is executed, and each block is controlled and data is transferred via the bus line 203.

When a character in the mathematical formula is input from the key input device 205 which is a part of the data input device, the character code corresponding to the character is stored in the key code memory 202. Processor 201
Is the pattern generator 20
6 and display device 21 through the display control circuit 208.
Display at 0. The input character code is stored in the text memory 209.

When all the mathematical expressions are input, the processing device 201 stores the mathematical expressions in the external storage device 213 through the external storage device control circuit 212.

When normal characters are entered, the characters may be arranged in lines. In the case of a symbol with consecutive subscripts on the left, right, top, and bottom (hereinafter simply referred to as mathematical symbol) such as Σ and ∫,
It is necessary to arrange the subscripts according to the subscript position unique to each symbol. The above-mentioned subscript position peculiar to the mathematical symbol is stored in the mathematical symbol memory 207.

FIG. 3 shows the structure of the mathematical expression symbol memory 207. 301 is a part that stores a code indicating each mathematical symbol, and 302 stores the number of subscripts of the mathematical symbol. 303 stores the corresponding address of the subscript coordinate section 304 that actually stores the subscript coordinates. The subscript coordinate section 304 stores relative coordinates when the position of the mathematical symbol is the origin. When the display position of the mathematical symbol is clear, the display position of each subscript can be uniquely obtained from the information of the mathematical symbol memory 207. However, in this method, when the operator corrects the content after determining the position of the subscript, the display coordinates of all the character strings must be recalculated. Therefore, in this embodiment, the display position of each character string is stored in the text memory 209, only the changed portion is calculated based on the data before the change, and the processing speed is increased.

FIG. 1 shows the structure of the text memory 209 of this embodiment.

The text memory 209 includes a coordinate management unit 101 and a text unit 102.
It consists of two.

The coordinate management unit 101 further finely addresses the display coordinate area 103 that stores the display coordinates of the character string, the character number area 104 that stores the number of characters included in the character string, and the address that indicates the address of the text portion 102 that actually contains the character. It is divided into pointers 105.

It is also possible to have one coordinate management unit 101 for one character of data in the text portion 102. However, there is almost no case where the character display position is changed on a character-by-character basis. Therefore, in the present embodiment, a delimiter is inserted in the text part, and the delimiter to the delimiter are treated as one character string, and one coordinate management unit 101 is provided. As a result, the data of the coordinate management unit 101 can be significantly reduced.

In this embodiment, when a mathematical expression is input from the key input device 205, the display position of the character string is calculated based on the information in the mathematical expression symbol memory 207 and stored in the coordinate management unit 101 in the text memory 209. When the content of the character string is changed as a result of editing the mathematical formula, the coordinate of the changed character string is calculated from the data of the coordinate management unit 101 and is stored again in the coordinate management unit 101.

There are various methods for expressing the coordinates of the coordinate management unit 101. Expressing the coordinates of each character string with absolute coordinates based on a certain point on the display screen of mathematical expressions, for example, In the equation, the coordinates of X _i are (x ₀ , y ₀ ) in FIG. However, since some of the character strings forming the mathematical formula have a subordinate relationship, the amount of data can be reduced by using the relative coordinates using this relationship. In the above formula, the symbol Σ is the lower limit value, the upper limit value,
It is known that the three character strings of terms are connected. Therefore, the coordinate management unit 101 is provided with a dependent pointer that points to the address of the display coordinate area of these dependent character strings, and according to this pointer, the coordinates of the dependent character string are expressed as relative coordinates from the mathematical symbol. FIG. 5 shows the coordinates of X _i in the mathematical expression of FIG. 4 by this method, but obviously the coordinate values (x ₁ , y ₁ ) are (x ₀ , y ₀ ) of FIG. Is smaller than. As described above, in the relative coordinates, the maximum value of the coordinates is small, so that there is an advantage that the coordinate data can be small.

〔The invention's effect〕

According to the present invention, since the display coordinates of each character string are stored, it is not necessary to recalculate the display coordinates of all the character strings when the content of the character string is corrected, and the processing speed can be increased. You can Also, by having the coordinates of the character string as relative coordinates, the amount of data can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a text memory in which display coordinates of a character string of an embodiment of the present invention are stored, FIG. 2 is a device configuration diagram of the present invention, and FIG. 3 is a mathematical symbol memory of FIG. FIG. 4 is a schematic diagram showing the internal structure of FIG. 4, FIG. 4 is an explanatory diagram when the coordinates of the character string are expressed in absolute coordinates, and FIG. 5 is an explanatory diagram when the coordinates are shown in relative coordinates. 101 ... Coordinate management section, 102 ... Text section, 103 ... Display coordinate area, 104 ... Character number area, 105 ... Address pointer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Nakajima 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Inside the Hitachi, Ltd. microelectronics equipment development laboratory (56) Reference JP-A-61-77981 (JP , A)

Claims (2)

[Claims] 1. A document creating device for displaying character information on a display device and creating or proofreading and editing a document according to an instruction from an input device, wherein a character string group having a subordinate relationship between respective character strings is input. And a means for displaying the character string group, a means for storing the subordinate relationship, and a means for correcting each character string of the character string group, wherein display coordinates for each character string of the character string are stored. The display coordinate of each character string is the coordinate of the character position of the head in the hierarchy formed for each character string, and the display coordinate of each character of the character string and each character string is Expressed by relative coordinates according to the relationship between the character position of the head and each character and each character string, and when changing the contents of the character string, at least one of the display coordinates and the relative coordinates is changed. Document work characterized by changing Equipment. 2. A means for storing the above-mentioned subordination relationship is configured such that data serving as a symbol that separates a data group for one character string from a data group for another character string is stored between the data groups for each character string. The document creation device according to claim 1, wherein the display coordinates are provided for each of the data groups.