JP3088135B2 - How to manage the start point of filling a closed area - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphics function used in an information processing apparatus or a document processing apparatus, and more particularly to a method for managing a filling start point in a closed area filling function.

[0002]

2. Description of the Related Art Graphics systems of this kind are supported by software called graphics programs. When the user specifies a coordinate and selects a desired figure (a circle, a straight line, an ellipse, a rectangle, etc.), the system registers the type (function) and coordinates of the figure as parameters. Then, when a window is opened on the screen, a figure that is wholly or partially included in the window is searched, and the corresponding figure is drawn within a range included in the window. Further, for a figure that forms a closed area such as a circle, an ellipse, and a rectangle, a function is provided to fill the closed area in response to a predetermined instruction.
Such drawing or painting processing is performed by software called a drawing module.

[0003] A conventional closed area filling function will be described with reference to FIG. In FIG. 4A, the world coordinate is a coordinate system in a rated size (for example, A4 size) W.
In 2 and 3, the drawing position on the world coordinates is set and registered.
The device coordinates are a coordinate system in the window area D that can be arbitrarily set within the world coordinate area. Each of the figures 1, 2, and 3 is drawn at a set coordinate position within a range included in the window area D. Then, when the user sets and inputs a filling start point X at an arbitrary position in the closed area of each drawn figure, the closed area is filled.
In the illustrated example, since the filling start points F and S are set and input in the closed areas of the elliptical figure 2 and the rectangular figure 3, respectively.
Those closed areas are filled in the range included in the window area D.

[0004]

In the conventional graphics system, if the window screen is expanded downward by scrolling downward from the screen state shown in FIG. 4A, the screen shown in FIG. The screen looks like this. In this case, the screen before scrolling is drawn using the data stored in the image memory as it is, and for the figure incremented by scrolling, the data of the registered figure is converted into an image and drawn. As a result, the entire rectangular graphic 3 is drawn in the window area D.

However, the filled area in the rectangular figure 3 remains as it is, and the newly added portion is not filled. This is because the area around the filling start point S set and input before is already filled, and this filling start point S does not act on the increased closed area portion of the newly drawn figure 3. is there. However, the user intends to fill the entire closed region of the graphic 3 within the range included in the window D when setting and inputting the filling start point S first. It is not desirable that an unpainted portion appears in FIG. Thus, in order to paint the entire figure 3, the user has to set and input a new painting start point in the newly incremented area. Although there is a method of clearing the entire window screen once and redrawing (redrawing), there is a problem that it takes too much time according to the mode.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been made in view of the above circumstances, and displays a filled area as specified by a user on a screen regardless of a change in a window screen caused by scrolling or the like. The purpose is to provide a starting point management method.

[0007]

In order to achieve the above object, a method for managing a closed area filling start point is to specify drawing coordinates, register data of a desired figure in advance, and specify a designated figure. A graphics system having a function of drawing the registered figure in a window within a range included in the window and filling a closed area designated by a predetermined filling start point with a range included in the window In the above, when the filling of the specified closed area is limited by the frame of the window, a filling restart point corresponding to the limited position and the limiting direction of the filling is defined, and the filling restart point is defined. Is set, and when the frame of the window later expands in the limit direction, the filling is performed on the increased portion of the closed area based on the data of the filling restart point. It was how to open.

[0008]

When a filling start point is set and input in the closed area of the figure displayed in the window, the filling function is activated to fill the closed area. When a part of the figure goes out of the window, the filled area is limited (clipped) by the window frame. In this case, according to the present invention, the restriction position (interruption position) and the restriction direction (interruption direction)
It is stored in a predetermined storage means (buffer). Further, a paint re-start point is calculated from the paint restriction position and the paint restriction direction, and data representing the coordinate position of the paint re-start point is also stored in the storage means. Thereafter, when the frame of the window expands in the restricted direction and the closed area of the figure increases in the same direction, the repainting start point is read out from the storage means, and the paint for the increased portion is read. By being given as a crush start point, the fill function automatically restarts and fills the increased portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing a configuration of a main part of a graphics system according to an embodiment of the present invention. The input unit 10 may be a keyboard, a mouse, or the like.
The function / parameter of the desired figure and the coordinates at which the figure is to be drawn are input as figure data. Each graphic data is decoded by the control unit 12 and then sequentially stored in a predetermined area of the memory 16 by the writing / reading unit 14. In this way, figures are registered one by one in the order of input.

The control unit 12 receives the input data as described above,
In addition to controlling decoding of commands and writing / reading of graphic data to / from the memory 16, it performs data transfer to the redraw management unit 18 and the drawing unit 22, and issues commands. The redraw management unit 18 handles data for managing the suspension / resumption of filling, and writes and reads required data to / from the redraw buffer 20.

The drawing unit 22 includes a drawing module.
Upon receiving data of a graphic to be drawn from the control unit 12,
The graphic data is converted into image data in a format suitable for drawing, and then drawn at a predetermined coordinate position on the display 24. Upon receiving an instruction to start painting and the coordinate data of the painting start point from the control unit 12, it also has a function of painting the inside of the closed area to which the painting start point belongs. However, in the case of the window screen display, the frame of the currently specified window is used as a reference (clip), and only the figure in the clip is drawn and filled. Therefore, if the shape to be filled is clipped by the window frame,
The filled area will be interrupted by the window frame. In the present embodiment, data representing the paint interruption position and data representing the paint interruption direction are provided from the drawing unit 22 to the redraw management unit 18 via the control unit 12.

Next, the operation of this embodiment will be described with reference to FIGS. First, FIG. 3A corresponds to FIG. 4A, in which a circular figure 1, an elliptical figure 2 and a rectangular figure 3 are drawn in a window D. Of these shapes,
Fill start points S and F are set and input in the closed areas of the elliptical figure 2 and the rectangular figure 3, and both closed areas are respectively filled.

In this case, the elliptical graphic 2 is clipped by the right frame of the window D, and the rectangular graphic 3 is clipped by the lower frame of the window D. Interruption position (Ra,
Rb), data representing (Qa, Qb) and data representing the direction in which the painting is interrupted (rightward direction in the elliptical figure 2 and downward direction in the rectangular diagram 3) are redrawn from the drawing unit 22 through the control unit 12 by the drawing unit 22. It is provided to the management unit 18. The painting interruption positions (Ra, Rb) and (Qa, Qb) are given as coordinate positions in the device coordinate system.

The redraw management unit 18 stores the data from the drawing unit 22 in the redraw buffer 20 in a format as shown in FIG. At that time, for each of the paint interruption positions (Ra, Rb) and (Qa, Qb), the paint for restarting the paint for the closed area portion to be incremented when scrolling is performed in the paint interrupt direction later. Filling restart point S ',
F ′ is calculated, and the coordinate data of the repainting start points S ′ and F ′ are also stored in the redraw buffer 20. The positions of the paint re-starting points S 'and F' are selected, for example, at positions displaced somewhat in the painting interruption direction from the respective middle points of the painting interruption positions (Ra, Rb) and (Qa, Qb). May be. The coordinate positions of the painting start points S ′ and F ′ are also given as coordinate positions in the device coordinate system. Then, as shown in FIG.
Each repainting start point S ', F' is located slightly outside each clip frame of the window D. In addition,
In FIG. 2, each scroll direction (painting interruption direction)
Only one paint re-starting point is set, but if there are a plurality of paint interruption areas in the same direction, a plurality of the paint re-starting points are set.

When scrolling is performed, for example, downward from the state shown in FIG. 3A, the control unit 12 sends a notice to that effect to the redraw management unit 18. The redraw management unit 18 reads from the reflow buffer 20 the coordinate data of the repainting start point (S ′ in the example of FIG. 3) corresponding to the scroll direction, and reads the scroll distance (from the original device coordinate origin O after scrolling). After performing coordinate correction according to the movement distance to the device coordinate origin O ′), the coordinate data of the paint re-starting point S ′ is sent back to the control unit 12.

Then, the control unit 12 gives a painting start command to the drawing unit 22 using the point S 'as a painting start point. Thus, the drawing unit 22 displays the matching part of the screen before scrolling by using the image data stored in the image memory as it is, and displays the registered graphic data from the memory 16 for the graphic part incremented by scrolling. , And the closed area portion incremented by scrolling is filled in the range included in the window D in response to the painting start command using the above-mentioned point S 'as the painting start point. As a result, a screen as shown in FIG. 3B is displayed, and the closed region of FIG. 3 is completely filled with no unpainted portion.

When the window screen is scrolled to the right from the state shown in FIG. 3A or FIG. 3B, the same operation as described above is performed, and the incremental closing of FIG. Filling is automatically resumed for the area portion.

As described above, in the system of the present embodiment, if the user sets the filling start point once for a desired figure, even if the filling area of the figure is restricted (clipped) by the frame of the window, When scrolling is performed later and the clip window frame is enlarged, the filling is automatically restarted with respect to the enlarged portion of the closed area, and the closed area of the figure maintains the filled area. It is no longer necessary to input new settings.

[0019]

As described above, according to the present invention, when the filling of the designated closed area is restricted by the frame of the window, the filling is restarted according to the restricted position and the restricted direction of the filling. A point is defined, and data of the filling restart point is set, and when the window frame expands in the limit direction later, the increment of the closed area is calculated based on the data of the filling restart point. Filling is automatically restarted for the part that has been filled, so that the desired filled area once designated by the user can be completely displayed (without unfilled) regardless of the change in the window range. Labor and time can be greatly reduced and shortened.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main configuration of a graphics system according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a format example of data stored in a redraw buffer according to the embodiment.

FIG. 3 is a diagram showing a screen for explaining the operation of the system according to the embodiment.

FIG. 4 is a diagram showing a screen for explaining the operation of a conventional system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Input part 12 Control part 14 Writing / reading part 16 Memory 18 Redraw management part 20 Redraw buffer 22 Drawing part 24 Display

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Claims (1)

(57) [Claims] 1. Designating drawing coordinates and registering data of a desired figure in advance, drawing the registered figure in a designated window within a range included in the window, and applying a predetermined paint In a graphics system having a function of filling a closed area specified by a crushing start point within a range included in the window, when the filling of the specified closed area is restricted by a frame of the window, A paint re-starting point is defined according to the squeezing limit position and the limiting direction, data of the paint re-starting point is set, and the painting is performed later when the window frame is enlarged in the limiting direction. A method for managing a closed area filling start point, characterized in that filling is resumed for an increased portion of the closed area based on data of a crushing restart point.