JPH04127196A - Figure enlargement and reduction system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for partially enlarging and reducing graphic data in a graphic processing system.

[Conventional technology]

The conventional technology, as shown in Japanese Patent Application Laid-Open No. 61-27587, has adopted a method of displaying a specified area in a window of a specified size at a magnification given by a command.

[Problem to be solved by the invention]

In the above conventional technology, the scaling factor is given by command, which makes the operation complicated, and it is difficult to imagine how large the figure will be after scaling, making it difficult to understand what scaling factor to set. There was a problem with that.

An object of the present invention is to improve the operability of enlargement/reduction by simplifying the enlargement/reduction operation and visually setting the magnification.

Means for Solving Problem C] In order to achieve the above purpose, a window whose size can be changed arbitrarily is prepared, and a specified area is displayed by being enlarged or reduced to fit the size of the window. Enlargement/reduction can be performed with simple operations, and the magnification can be set visually. Furthermore, if the scaling factor is determined by a window whose size can be arbitrarily changed, the graphic data will be deformed if the aspect ratio of the window differs from the original graphic data. In order to avoid this, we have also provided a mode in which the aspect ratio of the window is kept the same as the aspect ratio of the original graphic data6. Specify the area you want to scale. A window that can be changed to any size serves as a means of specifying the scaling factor. The vertical and horizontal scaling factors are determined from the vertical and horizontal lengths of the window and the vertical and horizontal lengths of the specified area. The enlarging/reducing means enlarges/reduces the figure within the original designated area according to this enlargement/reduction magnification, and displays the result in the window. At this time, since the scaling factors in the vertical and horizontal directions are generally different, deformation of the figure occurs as a result of scaling. In case you want to avoid this, there is a mode that keeps the window's aspect ratio the same as the original specified area's aspect ratio, so that the vertical and horizontal scaling ratios are the same.
Prevents shape deformation.

〔Example〕

An embodiment of the present invention will be described below.

FIG. 1 is a diagram showing an example of the operating method of the present invention. 1
is the graphic display, 2 is the mouse pointer, 3 is the
is a rectangle indicating a scaling area, 4 is a window, and 5 is a window frame. First, as shown in (a), move mouse pointer 2 to one end point of the diagonal line of the area you want to scale, press the mouse button, and then move mouse pointer 2 while holding down the mouse button. and,(
As shown in b), a rectangle 3 whose diagonal line is a line connecting the mouse pointer 2 and the position where the mouse button is pressed is displayed. 1 until this rectangle 3 matches the area you want to scale. When you move the mouse pointer 2 and release the mouse button, a window 4 with the same size as the rectangle 3 is generated as shown in (C), and the area surrounded by the rectangle 3 is displayed at the magnification - magnification. Next, when the mouse pointer 2 is moved over the window frame 5 and the mouse button is pressed, and the mouse button is further moved while being pressed, the window frame 5 deforms to follow the mouse pointer 2. When the mouse button is released when the window frame reaches the desired size, the window 4 is enlarged to fit the window frame 5, and the display contents of the window 4 are similarly enlarged and displayed, as shown in (d).

It is also possible to reduce the size of the window 4 and display the displayed contents in a reduced size by a similar operation. Further, in a mode in which the aspect ratio of the window 4 is kept constant, when the horizontal length of the window 4 is changed, the vertical length of the window 4 is also changed in conjunction with the change to keep the aspect ratio constant. The same applies when the length of the window 4 in the vertical direction is changed.

Next, we will discuss how to realize such an operating environment. FIG. 2 shows an example of a system that implements the present invention. 1 is a graphic display, 6 is a keyboard, 7 is a mouse, 14 is a frame buffer, 16 is a central processing unit, 17 is a system bus, 1
8 is the main memory. FIG. 3 is an example of a functional block diagram of the present invention realized on such a system. 1 is a graphic display, 6 is a keyboard, 7 is a mouse, 8 is an input control section, 9 is a main control section, 10 is a scaling control section, 11 is a window control section, 12 is another control section,
13 is a drawing processing section, 13-1 is a graphic drawing section, 13-2 is a scaling processing section, 13-3 is a data transfer section, 14 is a frame buffer, and 15 is a work memory. The input control section 8 is a section that sends inputs from input devices such as the keyboard 6 and mouse 7 to the main control section 9 in the order of input. The main control section 9 is a section that passes control to the enlargement/reduction control section 10, window control section 11, and other control sections]2 in response to input from the input control section 8. The enlargement/reduction control section 10 is a part that controls enlargement/reduction processing, which is the core of the present invention. The window control unit 11 generates, deletes, and enlarges/reduces windows according to mouse input. The other control section 12 is a section that performs controls other than enlargement/reduction control and window control. The drawing processing section 13 is a section that performs drawing in the frame buffer 14 and work memory 15 in response to requests from the enlargement/reduction control section 10, the window control section 11, and other control sections 12. The drawing processing section 13 includes a graphic drawing section 13-1, a scaling processing section 13-2, and a data transfer section 13-3.

The contents of frame buffer 14 are displayed as is on display 1.
Output to. The work memory 15 is captured on the main memory 18. Expansion/reduction processing using this functional block configuration will be described with attention to the control flow of the expansion/reduction control section 10. The control flow of the enlargement/reduction control section 10 is shown in FIG. In this embodiment, the trigger indicating the start and end of the scaling process is given manually by a key. When the enlargement/reduction processing start key on the keyboard 6 is pressed, the input control section 8
is transmitted to the main control section 9 through the main control section 9, and the main control section 9 activates the enlargement/reduction control 19 of the enlargement/reduction control section 10. Then, the enlargement/reduction control 19 first performs a loop until the mouse button is pressed in steps 19-1 and 19-2.

Next, when the mouse button is pressed, save the position of mouse pointer 2 at that time with 19-3, 19-4°19-5.
Until the mouse button is released in 19-6, the figure drawing unit 1 in the drawing processing unit 13 draws a rectangle 3 whose diagonals are the position saved in 19-3 and the current position of the mouse pointer 2.
Request 3-1.

Then, when the mouse button is released, the current position of mouse pointer 2 is saved at 19-7, and at 19-8, the current position of mouse pointer 2 is saved.
The contents of the rectangle on the frame buffer 14 whose diagonal line is the position saved in steps 19-3 and 19-7 are stored in the work memory 15.
The data transfer unit 13 in the drawing processing unit 13 sends a request to transfer the request to
- Issue on 3. Then, in step 19-9, a request is made to the window control unit 11 to generate a window 4 having the same size as the rectangle. Thereafter, a request is issued to the data transfer unit 13-3 in the drawing processing unit 13 to transfer the contents of the rectangle transferred to the work memory 15 in step 19-10 to the window 4. The state at this time is shown in FIG. 1(C). After that, the enlargement/reduction process begins. 19-11. Check whether the enlargement/reduction process end key was input at 19-12, and if it was input, 19
At -13, the window control section 11 is requested to erase the window 4, and the enlargement/reduction control 19 is ended. If no input has been made, repeat steps 19-14, 19-15, and 19-16. In step 19-14, the window control unit 11 is inquired about the size of the window 4. Then, check if the window size has changed on 19-15,
If there is no change, skip the process 19-16. 19
-16, the enlargement/reduction processing unit in the drawing processing unit 13 sends a request to enlarge or reduce the contents of the rectangle transferred to the work memory 15 to the size of the window 4 and transfer it to the window 4.
-2 and sent to the data transfer unit 13-3. Note that in the mode that keeps the aspect ratio of window 4 constant.

Recalculate the window size so that the aspect ratio of window 4 remains constant when the window size is changed,
It is necessary to add processing for issuing a request to the window control unit 11 to change the window size to the recalculated size.

〔Effect of the invention〕

According to the present invention, partial enlargement/reduction of a screen can be performed in the same way as enlarging/reducing a window, so the operation is simple.Moreover, since the enlargement/reduction magnification is determined by the window size, the magnification can be determined visually, which improves operability. Improvements can be made.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the scaling operation of an embodiment of the present invention, FIG. 2 is a block diagram of the hardware of the present invention, FIG. 3 is a functional block diagram of an embodiment of the present invention, and FIG. It is a control flowchart of the enlargement/reduction control section therein. 1... Graphic display, ・Mouse deiner, 3... Rectangle indicating a scaling area, 4... Window, 5... Window frame.

Claims (1)

[Scope of Claims] 1. In a graphic processing system including a central processing unit, a main memory, an input device, and a graphic display, means for specifying an enlargement/reduction area of graphic data displayed on the graphic display; and a window whose size can be arbitrarily changed, and the graphic data specified by the means for specifying the enlargement/reduction area is enlarged or reduced by the enlargement/reduction means to fit the size of the window. A figure enlargement/reduction method that is characterized by displaying images as follows. 2. In claim 1, the scaling factor is determined independently in the vertical and horizontal directions from the vertical and horizontal lengths of the area specified by the scaling area designation means and the vertical and horizontal lengths of the window. The figure scaling method that you are looking for. 3. The graphic enlarging/reducing method according to claim 1, wherein the size of the graphic data is continuously changed by continuously changing the size of the window until an instruction to terminate is given. 4. The graphic scaling method according to claim 1, further comprising a mode in which the aspect ratio of the window is kept equal to the aspect ratio of the area specified by the scaling area specifying means.