JPH0343663B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a line display/erasing method for displaying and erasing lines on a display screen.

On a display screen such as a CRT, in addition to grid-like tables, there are methods for displaying and erasing lines when creating tables in which item columns are subdivided in the downward direction or in the right column direction. Conventionally, the method of specifying the starting point using a cursor, etc.
A method of specifying an end point position, a method of specifying a point on a line, a method of moving a cursor and using its locus, etc. have been proposed. However, such a conventional method has a problem in that the amount of movement of the cursor is extremely large, so that it takes time to operate.

SUMMARY OF THE INVENTION An object of the present invention is to provide a line display/erasing method that reduces the movement of the cursor and allows lines to be displayed and erased in a short time.

In order to achieve such an object, the present invention includes a memory means for storing line information including the starting point and ending point position of the line displayed on the display screen, and in the case of line display, the line information to be displayed on the display screen is provided. inputting the starting point position of the line, determining the ending point position of the line to be displayed based on the input information and line information from the memory means, creating line information, and storing it in the memory means;
If the line is displayed on the display screen and you want to erase the line, input the search start position of the line to be erased from the display screen, and based on the input information and the line information from the memory means, search for the starting point and line of the line to be erased. The feature is that while the end point position is determined and the line information is updated, it is also erased from the display screen.

Hereinafter, the present invention will be described in detail with reference to embodiments.

FIG. 1 shows an overview of a display device according to the present invention. As shown in the figure, the display device is keyboard 1 and
It consists of a CRT display section 2, and a keyboard 1 is provided with a cursor movement key 3, a vertical line drawing command key 4, a horizontal line drawing command key 5, a line erasing command key 6, and a line segment erasing command key 7.

Next, a key operation procedure for displaying a table as shown in FIG. 1 on the display unit 2 will be described. Here, as shown on keyboard 1, cursor movement keys 3,
Considering line drawing command keys 4 and 5, line erasing command key 6, and line segment erasing command key 7, press line erasing command key 6 and line drawing command key 4 or 5 simultaneously for line erasing, and pressing line segment erasing command key 4 or 5 at the same time. It is assumed that this is executed by pressing the line segment deletion command key 7 and the line drawing command key 4 or 5 at the same time. The keys 3 to 7 do not need to be special keys, and alphanumeric keys may be provided with the above functions.

First, in order to create a grid-like table as shown in FIG. Press . In this case, since the end point position is not input, on the CRT display section 2, the horizontal line is displayed at position E, and the vertical line is displayed beyond position I to the right edge of the screen and the bottom edge of the screen. Next, the cursor is set at starting points B, C, and D, and the vertical line drawing command key 4 is pressed, respectively. Further position E
Set the cursor to , press the vertical line drawing command key 4, then press the line erase command key 6 and the horizontal line drawing command key 5.
Press at the same time to erase the horizontal line displayed to the right of position E. At this time, the vertical lines displayed from positions B, C, D, and E are displayed up to the bottom edge of the screen as before. Next, move the cursor to position F, G,
H, I, and press the horizontal line drawing command key 5. In this case, a point on the vertical line displayed from position E is given as the end point position. Next, the cursor is set at positions I, J, K, L, and M, and the line erasure command key 6 and vertical line drawing command key 5 are pressed simultaneously. With the above operations, the table shown in FIG. 2 can be displayed. In addition, instead of the operating procedure described above,
First, display the table frame by specifying positions A, E, I, and M, and then draw vertical and horizontal lines within the frame by specifying positions B, C, D, F, G, and H. In that case, erasing the line by specifying the positions J, K, and L can be omitted. By the above operations, a grid-like table as shown in Fig. 2 is created, and then by setting the cursor at position B and pressing the line segment deletion command key 7 and the vertical line drawing command key 4 at the same time, the end point position is , position N on the displayed horizontal line is given from position F, and the line segment having position B and position N as end points is erased. Furthermore, by simultaneously pressing the line segment deletion command key 7 and the vertical line drawing command key 4 at the same time, a position N on the horizontal line displayed from position F is moved.
The line segment whose end point is the position on the horizontal line displayed from position G is erased. Next, by setting the cursor at position D and pressing the line segment deletion command key 7 and the vertical line drawing command key 4 at the same time, the line segments having position D and position Q as end points are deleted. Furthermore, the cursor is set at positions F and H, and the line segment deletion command key 7 and horizontal line drawing command key 5 are pressed simultaneously. With the above operations, the table on the CRT display section 2 shown in FIG. 1 can be created.

FIG. 3 shows a block diagram of an apparatus for realizing the line display/erasing method according to the present invention. In such a configuration, the cursor movement key 3 on the keyboard 1 is pressed to move the cursor.
Cursor position information on the CRT display section 2 is stored in the register 8 by the CRT driver 18. Next, when the line drawing command keys 4, 5, the line erasing command key 6, or the line segment erasing command key 7 is pressed, a code is generated by the keyboard driver 9, and the code is stored in the register 10. CPU11 is register 1
The program in the storage device 12 is started from the code in 0. The program first moves the cursor position on the CRT display unit 2 stored in the register 8 to a screen buffer 1 divided into many lines and columns.
3, and stores the converted position in the register 14 as the starting point position. If the pressed key is the line drawing command key 4 or 5, the program will execute the information on the already drawn line stored in the storage device 15 (line start point and end point position information, hereinafter referred to as line data). The end point position of the line is analyzed using horizontal line information if the command is a vertical line drawing command, or vertical line information if the command is a horizontal line drawing command, and stored in the register 14. The program is based on the line data stored in register 14.
A character generator (CG) memory 16 stores display patterns in buffers from the line drawing start line and start digit to the end point line and end point digit on the screen buffer 13 corresponding to the display position of the CRT display unit 2. Stores the address of. The screen display adapter 17 retrieves display patterns from the CG memory 16 based on the addresses stored in respective positions on the screen buffer 13 and displays them on the CRT display section 2.
Display a line at the top. The program also transfers the line data stored in the register 14 to the storage device 15.
Add to the line table in and update the line table.

If the pressed keys are the line erase command key 6 and the line drawing command keys 4 and 5, the program is stored in the storage device 15.
The end point position of the line to be erased is determined and stored in the register 14 by referring to a line table that is stored in the line table that is made up of information on lines that have already been drawn.
Based on the data stored in the register 14, the program is stored in buffers from the erase start line and start digit to the end point line and end point digit on the screen buffer 13 corresponding to the erase position on the CRT display section 2.
Delete the address of CG memory 16. The screen display adapter 17 displays the CG based on the addresses stored in the respective positions on the screen buffer 13.
A display pattern is retrieved from the memory 16 and a line is displayed on the CRT display section 2. In addition, the program
The line table in the storage device 15 is updated based on the data stored in the register 14.

On the other hand, if the pressed keys are the line segment deletion command key 7 and the line drawing command keys 4 and 5, the program executes a line table that is stored in the storage device 15 and is made up of information on lines that have already been drawn. The start point and end point positions of the erased line segment are analyzed and stored in the register 14. The program is based on the data stored in the register 14, and the CG stored in the buffer from the erase start line and start digit to the end point line and end point digit on the screen buffer 13 corresponding to the erase position on the CRT display section 2. Delete the address in memory 16. The screen display adapter 17 is a screen buffer 1.
A display pattern is taken out from the CG memory 16 based on the addresses stored in the respective positions on the CRT display section 2, and lines are displayed on the CRT display section 2. Also,
The program updates the line table in storage device 15 based on the data stored in register 14.

Figure 5a is an example of the displayed line pattern, 8
The case of two patterns is shown. Note that by writing line pattern information and character pattern information to the screen buffer 13 at the same time, as shown in FIG. 5b,
Line patterns and character patterns can be displayed at the same time at the same position. In that case, the CG address is Figure 5c.
It is structured as follows.

Figure 5d shows a specific example of a CG address.
The first bit is 1 if there is line pattern information, and 0 if there is only character pattern information.

1 to 8 in FIG. 5d correspond to the case where a line pattern and a character pattern are displayed simultaneously, like 1 to 8 in FIG. 5b. In this way, by having line pattern address information and character pattern address information at the same time, line patterns and character patterns can be displayed simultaneously.

FIG. 4 shows a flow of an example of program processing in the CPU 11 of FIG. 3, in which program processing of end point analysis, end point analysis, and line table update is performed. The details of the processing flow will be explained below with reference to FIG.

First, the position on the display unit obtained by moving the cursor (100) is replaced with the position (x, y) on the screen buffer (110). Next, the code of the (102) key pressed on the keyboard 1 is determined (103-106), and if it is a vertical line drawing command or a horizontal line drawing command, the process moves to the end point analysis routine (150).

This end point analysis routine (150) will be explained. The basic operation is the same whether it is vertical line drawing or horizontal line drawing, so end point analysis in vertical line drawing will be explained as an example. First, the horizontal line record head number RS is set as the horizontal line code number _Lj (151). If there is a starting point digit S _xj of the vertical line to be drawn between the starting point digit S _xj and the ending point digit E _xj of the line data of the record with horizontal line record number L _j (152), the horizontal line record number
Let the end point row E _yj of the line data of record L _j be the end point row E _yi of the vertical line (155). Horizontal line record number L _j
If is equal to the horizontal line end record number RE (157),
Line data is constructed using the obtained temporary end point row E _yi as the vertical line end row (159), but if they are not equal, the backward record number is set as record number L _j to refer to the line data of the next horizontal line record. BR _j
(158). If the newly obtained provisional vertical line end row E _yi by repeating the above steps is located further from the starting point position than the original vertical line end row,
The newly obtained temporary vertical line end row E _yi is set as the vertical line end row E yi, and in the reverse case, the original vertical line end row is set as the vertical line end row E _yi (154
~156). This procedure is repeated until the horizontal line record number L _j becomes equal to the horizontal line record end number RE, and the line data is configured as the end point position to find the vertical line end point row E _yi at that time. In the case of a vertical line, the starting point digit and ending point digit have the same value. Here, in order to speed up the record reference speed in end point position analysis, the line table is constructed by separating horizontal line records and vertical line records, but it is also possible to consider them as a single set of line records without considering them separately. .

An example of the line table in the above embodiment is shown in the sixth example.
As shown in the figure. This line table is composed of a management table A for managing line records and a data table B which is a collection of line records. Management table A manages vertical line records and horizontal line records stored in data table B separately, and in order to facilitate end point position analysis and record addition/update, horizontal line record start number RS, horizontal line record end number RS, horizontal line record end number RS, horizontal line record end number, etc. Number RE, vertical line record start number CS, vertical line record end number CE, maximum stored record number M, and also manage deleted records, and when the line records become saturated, add records into the deleted record. It consists of the deletion record start number DS for storing and updating. Data table B contains line data (starting point row SY, starting point digit SX, ending point row EY, ending point digit EX) and line data for horizontal lines, vertical lines,
It is composed of line records that collectively include a forward record number FR for relating each deleted record, a backward record number BR, and a record number L for identifying each record.

When the end point position analysis (150 in Figure 4 1) is completed,
The process moves to operation (160) of adding the input data and the end point position as line data to the line table, and updating the line table. For more information on this step,
The explanation will be given with reference to FIG.

FIG. 7 shows creation, addition, and updating of a line table. Here, as an example, horizontal lines, vertical lines,
Storage device 1 stores line records in the order of vertical line, vertical line, and horizontal line.
5 and configure the line table as shown in a.
Explanation will be given in order of b and c. First, as shown in FIG. 7a, a horizontal line record is stored. The record number L of the record will be assigned in the order in which it is stored.
It becomes 01. Also, since this is the first record, there is no forward record, so FF (hexadecimal) is set as the initial value of the forward record number FR. Since the backward record has not yet been stored, FF is set as the initial value of the backward record number BR. In order to show that there is one horizontal line record in the management table, set 01 as the horizontal line record start number RS, end number RE, and maximum stored record number M, and initialize the other fields by setting the initial value FF. There is. Next, a vertical line record is stored as shown in FIG. 7b. In this case, since this is the first vertical line record, there are no forward or backward records, so initial values FF are set for the forward record number FR and backward record number BR. Referring to the maximum stored record number M in the management table, the current record number is 01.
The vertical line record is stored in record number 02 of the data table. This vertical line record is stored in record number 02, so
The vertical line record start number CS and the vertical line record end number CE in the management table are updated from the initial value FF to 02, and the maximum stored record number M is also updated from 01 to 02. When more vertical line records are added,
Refer to the last number CE of the vertical line record in the management table and set that record number CE as the forward record number.
FR. In this case, 02 is the forward record number FR
is stored as . Also, since 02 is stored in the maximum stored record number M, this additional record is stored in record number 03 of the data table,
Update the maximum stored record number M from 02 to 03. Furthermore, since there is no backward record, the initial value FF is stored as the backward record number BR of the record with record number 03. In the vertical line record with record number 02, the record with record number 03 is newly added as a vertical line record, so the subsequent record number BR is updated from the initial value FF to 03. Management table A vertical line record end number CE
will also be updated from 02 to 03. Furthermore, when a vertical line record is added, as shown in FIG. The line record end number 03 is set, and the initial value FF is set as the rear record number. In record number 03, which is the forward record, the next vertical line record is stored in record number 04, so change the backward record number BR.
Update from FF to 04. In management table A,
Since record number 04 has been added to the vertical line record, the vertical line record end number CE is updated from 03 to 04, and the maximum stored record number M is updated from 03 to 04. Next, when a horizontal line record is added to record number 05, the horizontal line record end number RE in management table A is the number of the last horizontal line record, so that record number is changed to the forward record number.
Set as FR. In this case, 01 is set. The backward record number BR is set to an initial value FF. Also, the backward record number BR of the record with record number 01, which is the forward record, is updated from FF to 05. In the management table, since the horizontal line record has been added, the horizontal line record end number RE is updated from 01 to 05, and the stored maximum record number M is also updated from 04 to 05.

That is, when adding a line record, first,
An additional line record is stored in the next record number (in the data table) after the maximum stored record number M in management table A, that is, number M+1, and if the additional line record is a vertical line in the preceding record number FR, The vertical line record end number CE is set, and if it is a horizontal line, the horizontal line record end number RE is set, and the rear record number BR is always set to the initial value FF. Furthermore, since the next record has been stored in the front record of the additional line record, the record number of the added record is stored in the rear record number BR. The maximum stored record number M in the management table, the vertical line record end number CE, or the horizontal line record end number RE are also updated as records are added.

Next, the case where lines are erased will be explained with reference to FIG. Note that, as in the case of the above-mentioned end point analysis routine, the case where vertical lines are erased will be explained as an example.

When the line deletion command key and the vertical line drawing command key are pressed (106), in order to search all vertical line records, the vertical line record first number CS is first set as the record number L _i (108), and the first number CS of that number is set. Determine whether the position (xy) specified by the cursor is on the line of the record, that is, whether the set record corresponds to the record of the line to be erased (109), and If not, the record specified by the backward record number BR is retrieved (110) and the same process as described above is performed. If it is determined that the line record should be deleted, it is determined whether all lines are to be deleted (111), and if all lines are to be deleted, deletion is performed as shown in the example in Figure 8. Process.

FIG. 8 shows a case where the vertical line record with record number 03 and the horizontal line record with record number 05 in the records configured as shown in FIG. 7 are deleted in the above line table creation. First, when the record with record number 03 is deleted, the backward record number 03 of the vertical line record of record number 02, which is the previous record, is updated to the backward record number 04 of the deleted record, and the record number 04, which is the backward record, is updated. Update the forward record 03 of the vertical line record to the forward record number 02 of the deleted record. The record with record number 03 is set as the first deletion record in the deletion record head number DS of management table A and is managed. The initial value FF is set as the front and rear record numbers FR and BR of the front and rear records of the deleted record with record number 03. Next, when the horizontal line record with record number 05 is deleted, the backward record number BR of record number 01, which is the previous record, is updated to the initial value FF in the same way as described above. In this case, since the deleted record is the last record of the horizontal line records, the horizontal line record end number RE in the management table is updated to record number 01 of the record before the deleted record with record number 05. The record with record number 05 is the deletion record first number DS of the management table.
, and is connected after the last deleted record that already exists. In this example, record number 03
The backward record number BR of the deleted record is set to the initial value FF.
to 05, set the forward record number FR of the record number 05 deleted from 01 to 03, and set the backward record number BR to the initial value FF. When deleting a line, from the start point to the end point, the corresponding record is deleted from the line table.
When erasing from the middle of a line, change the end point position E _xi and E _yi of the line data in the data table to the cursor movement position x,
It will be updated to y.

Next, returning to FIG. 4 1, if the key pressed on the keyboard is the line segment deletion command key (104), the process moves to the end point analysis routine (200). This end point analysis routine will be explained. Note that, as in the case of the end point analysis routine described above, a case where a vertical line segment is erased will be explained here. The end point analysis routine consists of a start end point analysis routine and an end point analysis routine. First, enter the start point analysis routine, set the vertical line record start number CS as the vertical line record number L _i , and set the cursor line position y and the vertical line start point line SY _i
A sufficiently large value is set as the difference D (201).
If the starting point digit SX _i of the line data of the vertical line record with the vertical line record number L _i is equal to the cursor digit position x (202), the line data can be the target of line segment deletion. Therefore, if the cursor position y is between the start point row SY _i and the end point row EY _i of the line data of vertical line record number L _i (203), the cursor row position y is set as the erased line segment start point SDL ( 205). If there is no line in between, select the starting point row SY _{i where the distance from the cursor line position y to the starting point row SY i} of the line data of vertical line record number L _i is the minimum _.
In order to find the distance, it is compared with the distance D (204), and if it is smaller, the starting point row SY _i is set as the temporary erasure line segment starting point row SDL (206). Repeat the above steps until the vertical line record number L _i becomes equal to the vertical line record end number CE (207 to 208), and then
Let SDL be the starting point of the erased line segment for which SY _i is to be found. Next, the terminal point analysis routine is entered, and the horizontal line record start number RS is set as the horizontal line record number L _j (207).
Erase line segment start point SDL and horizontal line record start point row SY _j
A sufficiently large value is set as the difference D (209).
If the cursor digit position x is between the start point digit SX _j and the end point digit EX _j of the line data of the horizontal line record of horizontal line record number L _j (201), the start point row SY _j of the line data of the horizontal line record is an erased line segment. can be the terminal point EDL. Therefore, the starting point row SY _{j where the distance from the starting point SDL of the erased line segment to the starting point row SY j of} the horizontal line record is the minimum
In order to find the distance, it is compared with the distance D (211), and if it is smaller, the starting point row SY _j is set as the temporary erasure line segment end point EDL (212). Repeat the above steps until the horizontal line record number L _j becomes equal to the horizontal line record end number RE (213 to 214), and then add the start line to the horizontal line record.
Let EDL be the end point of the elimination line segment for which SY _j is to be found.

Starting point of the erased line segment obtained by the above process
The line table is updated based on the SDL and the end point EDL, and four examples of this update are shown in FIG. In Fig. 9a, when the cursor is set at position A and a line segment deletion command is executed, the line from position A to position B is erased, and the starting point line of vertical line data is
From SY _i to the starting point row of the horizontal line passing through position A SY _j to position B
Update to the starting point row SY _j of the horizontal line passing through. In FIG. 9b, when the cursor is set at position A and line segment deletion is performed, the vertical line displayed from position A is deleted and the corresponding vertical line data is deleted. In Figure 9c, if you set the cursor at position A and erase the line segment, erase the line segment from position A to position B, and replace the end point row EY _i of the vertical line data with the horizontal line passing through position B. End point row of horizontal line passing from end point row EY _j to position A
Update to EY _j . In Fig. 9d, if you set the cursor at position A and erase a line segment, erase the line segment from position A to position B, and delete the vertical line data and the end line EY _j of the horizontal line passing through position A. End line EY _i
The vertical line data and the starting point row of the horizontal line passing through position B
Divide into vertical line data with SY _j as the starting point row. The flow of these processes is shown in Figure 4 2, 220-226.
It is.

As described above, according to the present invention, it is only necessary to input the display start position information for display, and the search start position information and command for deletion, so the amount of cursor movement is reduced, and the line can be adjusted in a short time. Display can be erased.

[Brief explanation of drawings]

FIG. 1 is an overview diagram of a display device according to the present invention, FIG. 2 is a display example for explaining processing according to the present invention, and FIG. 3 is a block diagram showing an embodiment of a device implementing the method according to the present invention. 1 and 2 are flowcharts showing details of the program processing of the CPU in FIG. 3, and FIGS. 5 to 9 are diagrams for explaining the processing of the present invention, respectively. 6 is a detailed diagram of the line pattern, and FIG. 6 is a detailed diagram of the line table to show the form of the line table in the storage device in the block diagram of FIG. 3. FIGS. , FIG. 6 is a diagram showing how the line table shown in FIG. 6 is constructed, and FIG. 9 is a diagram showing an example of line segment deletion. 1...Keyboard, 2...CRT display section, 3...
...Cursor movement key, 4, 5...Line drawing command key, 6...Line deletion command key, 7...Line segment deletion command key.

Claims (1)

[Claims] 1 Equipped with memory means for storing line information including the starting point and ending point position of the line displayed on the display screen,
When a point on the display screen and a vertical line drawing command or a horizontal line drawing command are input, the vertical line to be displayed is determined based on the line information stored in the memory means, with the point on the display screen as the starting point of the line. Automatically determine the end point position of the line or horizontal line to create line information, store it in the memory means, display it on the display screen, and input a point on the display screen and a vertical line deletion command or horizontal line deletion command. If the line is erased, one point on the display screen is set as the position for determining the line to be erased,
Based on the line information stored in the memory means,
In the case of a vertical line deletion command, the vertical line itself or its extension passes through a point on the display screen, and in the case of a horizontal line deletion command, the horizontal line itself or its extension passes through a point on the display screen. A line display/erasing method characterized in that starting and ending positions of horizontal lines to be erased are automatically determined, line information stored in the memory means is updated, and the line information is erased from the display screen.