WO2002091304A1

WO2002091304A1 - Freehand-input pattern editing system

Info

Publication number: WO2002091304A1
Application number: PCT/JP2002/004353
Authority: WO
Inventors: Terufumi Hosoya
Original assignee: T-5 Corporation
Priority date: 2001-05-07
Filing date: 2002-05-01
Publication date: 2002-11-14
Also published as: JP2005234610A

Abstract

Operability is improved by arbitrarily selecting an area to be erased in a handwriting manner without any troublesome operation for erasing a pattern. A system for editing a pattern by freehand input comprising freehand input means (3, 4 and 5) for inputting an area to be edited, a pattern judging means (1) for judging whether or not the starting point of the pattern to be edited is the same as the ending point thereof, a pattern dividing/modifying means (1) for determining whether or not division is performed according to the result the of pattern judgment and the area to be edited and for dividing or modifying the pattern, a drawing coordinate calculating means (1) for calculating the drawing coordinates by judging whether or not a pattern erasure snap area is set, identifying the kind of a reference point for erasure, and judging whether or not the area to be edited is within the set erasure snap area, and a drawing means (1) for drawing a pattern for update based on the calculated drawing coordinate.

Description

Specification

Handwriting input figure editing system

Background of the Invention

TECHNICAL FIELD The present invention relates to graphic drawing (C AD) using a computer, and more particularly to a graphic editing system by handwriting input that enables graphic erasure as if writing on paper.

2. Description of the Related Art Conventionally, a mouse or an electronic pen is used to operate a deletion cursor (eraser) on a display as if by handwriting, and delete part or all of a drawn line, circle, ellipse, polygon, or other figure. Something like that has been proposed. For example, (1) In Japanese Patent Application Laid-Open No. 60-129829, a writing area on an electronic tablet having coordinates corresponding to display coordinates is divided into a plurality of grid boxes, and the writing area is intersected with an eraser. Search for the line segment or point of, and erase the figure in real time as the eraser moves.

(2) In Japanese Patent Application Laid-Open No. 5-2274412, the trajectory of the range of erasure by the eraser is calculated, the trajectory is overlapped with the beta data, and the data of the overlapped portion is erased. I do. (3) In Japanese Unexamined Patent Publication No. Hei 7-2-19701, a figure to be erased is marked by handwriting, and then a jagged erasing gesture is input by handwriting to erase the figure all at once. .

④ In Japanese Unexamined Patent Publication No. Hei 8-2663688, a figure to be erased is marked by handwriting, and then the erasing gesture is input by handwriting and erased. If you want to have the grid information of the intersection of, and if you want to partially erase the figure, after inputting the erase gesture, put an X mark on the part you want to erase and draw a line on the part you want to erase.

They had the following drawbacks.

In the above-mentioned Japanese Patent Application Laid-Open No. 60-1292829, figures are sequentially erased in real time along with the movement of the eraser. Lines and points in the grid pox are not sufficiently captured, causing erasure, and the eraser must be moved slowly for complete erasure. That's not going to work.

In the above-mentioned Japanese Unexamined Patent Application Publication No. 5-274744, the trajectory of the erasure range is calculated and the vector data within the range is erased, so the erasure will not be mottled. For example, when erasing a part of a line segment, it is not possible for an ordinary user to adjust the erasure range to the end by operating the electronic pen even if the end to be erased is set accurately. It is difficult. In the above-mentioned Japanese Patent Application Laid-Open No. 7-219701, the figure to be erased is marked by handwriting, and the erase gesture is input by handwriting to erase the figure all at once. Since selection is not a command, various operations or areas that are difficult to draw occur, and partial erasure of figures cannot be performed. „

In the above-mentioned Japanese Patent Application Laid-Open No. Hei 8-2-263688, since the selection of drawing and erasing is not a command in the same manner as in the Japanese Patent Publication No. Hei 7-219701, it is complicated. An area that is difficult to operate or draw occurs, and in the case of a figure that has an intersection, it is always erased up to the intersection, and it is not possible to erase it just before the intersection.

DISCLOSURE OF THE INVENTION The present invention has been made in order to solve the above-mentioned problem, and has as its object to improve the operability by making it possible to select an erasing area arbitrarily as if by handwriting without complicated operation for erasing a figure. I do.

For this purpose, the present invention provides a system for editing a figure by handwriting input, wherein:

Figure determining means for determining whether the starting point and the ending point of the figure to be edited are the same, and determining whether or not to divide the figure according to the figure determination result and the area to be edited, and dividing or changing the figure. Division change processing means,

The drawing coordinates are determined by determining whether or not the erase snap range of the figure is set, and if so, its type, and determining whether or not the edit target area is within the set erase snap range. Drawing coordinate calculation means for calculating, and drawing means for drawing and updating a figure based on the calculated insertion coordinates

And characterized in that: _Λ

Four

Further, the present invention is characterized in that the size of the erase snap range can be changed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing the overall configuration of a graphic editing system according to the present invention.

FIG. 2 is a diagram for explaining an example of linear division (elimination up to two intersections) according to the present invention. FIG. 3 is a diagram for explaining an example of straight line division (combination of tracing and erasing up to one intersection) according to the present invention.

FIG. 4 is a diagram illustrating an example of linear division (erasing of traced portions) according to the present invention. FIG. 5 is a diagram illustrating an example of dividing a straight line passing through the center of a circle according to the present invention.

FIG. 6 is a diagram illustrating an example of erasing a part of a circular arc where a circle and a straight line intersect according to the present invention.

FIG. 7 is a diagram illustrating an example of changing a circle into two arcs according to the present invention.

FIG. 8 is a diagram illustrating an example of graphic erasure according to the present invention. FIG. 9 is an example of erasing a figure drawn using the grid of the present invention.

FIG. 10 is a diagram for explaining the graphic erasure processing flow of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described.

Overall configuration> „

FIG. 1 is a diagram showing the overall configuration of the graphic editing system of the present invention. The computer for figure editing processing 1 stores the basic drawing figure data, the drawing processing program, the data of the drawing reference point in the case of editing such as figure deletion, and all the data necessary for drawing processing such as the editing program. Is stored. The mouse 3, tablet 4, and electronic pen 5 are used to draw and erase figures on the CRT 2 screen. The figures input to the computer 1 can be printed by a printer (not shown) as required. Next, an editing process of the present invention for erasing a drawing figure using the mouse 3 or the electronic pen 5 will be described. Editing (erasing) a drawn figure is the same as drawing a new figure excluding the erased area. In the present invention, whether the figure to be edited is a figure whose start point and end point are different, such as a line segment or a polygon composed of line segments, or a figure whose start point and end point are the same, such as a circle or an ellipse If it is determined and the part between the start point and the end point of the figure whose start point and end point are different is to be deleted, the figure segmentation process is performed in the deletion area, line segment data is read out, and a new drawing is performed. When deleting from the start point to the intermediate point or from the intermediate point to the end point, the figure is not divided. When erasing a figure whose start point and end point are the same, the figure is erased by performing a change process to the figure excluding the erasure area, reading out the arc or elliptical arc data, and drawing new. . Also, set the erase snap range for the erasure reference point such as the intersection point of the figure, the drawing center of the circle, ellipse, arc or elliptic arc, and the line to be erased is _

If it does not intersect with the erased snap range, the line segment data excluding the erased area is read out and inserted to erase the figure in the erased area. By reading and drawing line segment data excluding the end of the erasure area and the erasure reference point, the figure up to the erasure reference point is erased. By such a process, a figure can be erased only in a region desired by the user, and an edge to be erased can be set accurately if necessary. In the present invention, an icon such as an edit menu is not displayed around a screen or a tablet, and a command area is provided on a drawing window (not shown). When a symbol indicating an operation command is drawn in this command area, the computer It interprets the operation command and executes its processing. For example, if you select "XJ" in the command area, the erase mode will be set. If you select the write operation, the cursor will change to an eccentric shape, and if you select the erase operation, the cursor will change to the eraser type. The erasing operation has the same operation feeling as the writing operation by tracing the figure.

First, the erasure of an unclosed figure will be described with reference to FIGS. 2 to 4 using a straight line having an intersection as an example. Of course, the process is exactly the same even if it is a curve instead of a straight line.

<Line Elimination: Part 1> FIG. 2 is a diagram illustrating an example of line division (erasing up to two intersections). In this example, four straight lines AB, CD, EF, and GH intersect at intersections P1 to P4.If part or all of the line segment between the intersections is deleted, each intersection is deleted. It becomes a reference point. When the figure erasing mode is selected, the „

An erase snap range R is set nearby (Fig. 2 (f)). Here, when the cursor traces a part of the straight line AB (Fig. 2 (a)), the computer recognizes that the figure is an unclosed figure, and the point sequence of the traced area K (the thick line in the figure) Is obtained, it is determined whether or not the area K intersects with the erase snap range, and the dividing process is performed on the straight line AB. In this example, since the erasure area K intersects the erasure snap range R near the intersection P1 and the intersection P2, the straight line AB is divided from the point A to the intersection Pl and from the intersection P2 to the point B, and the line segment The data is read, the new line is drawn, and the line from intersection P1 to intersection P2 is erased (Fig. 2 (b)). In Fig. 2 (b), when a part of the straight line CD (between the intersections P3 and P4) is traced with the cursor, the coordinates of the point sequence of the traced area K are obtained, and the erased area is processed in the same manner as the straight line AB. Since K intersects with the erasure snap range near the intersection P3 and the intersection P4, the intersection P3 to the intersection P4 are erased (Fig. 2 (c)). In Fig. 2 (c), when a part of the straight line EF (between the intersections Pl and P3) is traced with a cursor, the coordinates of the point sequence in the region K traced in the same manner as the straight line AB are obtained. Since the erasure area K intersects with the intersection Pl and the erasure snap range near the intersection P3, the intersections P1 to P3 are erased (Fig. 2 (d)). Also, in Fig. 2 (d), when a part of the straight line GH (between the intersections P2 and P4) is traced with a cursor, the coordinates of the point sequence of the traced area K are obtained in the same manner as the straight line AB. Since the erasure area K intersects with the intersection P2 and the erasure snap range near the intersection P4, the intersection P2 to the intersection P4 are erased (FIG. 2 (e)). In this way, by setting the intersection as the erasure reference point and setting a predetermined range in the vicinity thereof as the erasure snap range, it is possible to erase up to the intersection. Of course, if you do not set the erase snap range, the traced area will be erased. _Λ

<Line Elimination: Part 2> FIG. 3 is a diagram illustrating an example of line division (combination of tracing and elimination up to one intersection). Also in this example, four straight lines AB, CD, EF, and GH intersect at intersections P1 to P4, and when erasing part or all of the line segment between the intersections, each intersection is erased. It becomes a reference point. Select the figure erasing mode and set the erasing snap range. When a part of the straight line AB (between the intersections P1 and P2) is traced with a force sol (Fig. 3 (a)), the computer recognizes that this is an unclosed figure and traces it. Obtain the coordinates of the point sequence of the area K (the thick line in the figure), determine whether the area K intersects with the erasure snap range near the intersection, and perform the division process on the straight line AB. In this example, since the erasure area K does not intersect with the erasure snap range near the intersection P1, but intersects with the erasure snap range near the intersection P2, point A—intersection P1—one end K of the erasure area It is divided into 1 and the intersection P2—point B, the line segment data is read out, a new straight line is drawn, and the intersection from K1 to the intersection P2 is erased (Fig. 3 (b)). .

Straight line elimination: Part 3> Fig. 4 is a diagram illustrating an example of straight line division (elimination of traced portions). Also in this example, four straight lines AB, CD, EF, and GH intersect at intersections P1 to P4, and when erasing part or all of the line segment between the intersections, each intersection is erased. It becomes a reference point. Select the figure erasing mode and set the erasing snap range. When a part of the straight line AB (between the intersections P1 and P2) is traced with a force sol (Fig. 4 (a)), the computer recognizes that this figure is an unclosed figure and traces it. Obtain the coordinates of the point sequence in area K (the thick line in the figure) Is intersected with a predetermined range near the intersection, and the dividing process is performed on the straight line AB. In this example, since the erase area K does not intersect with either the intersection P 1 or the erase snap range near the intersection P 2, the point A and the intersection P 1—one end K 1 of the area K and the other end K 2 of the area K —Intersection P 2 — Divided into point B, read the corresponding line segment data, draw a new line, and delete K 1 to K 2 (Fig. 4 (b)).

Straight line segment passing through the center of the circle>

FIG. 5 is a diagram illustrating an example of dividing a straight line passing through the center of a circle. In the case of a circle, the center is also the erasure reference point, and by setting the erasure snap range at the center, the same processing as in the case of the intersections in FIGS. 2 to 4 is performed. For example, as shown in Fig. 5 (a), when a traced part of a straight line L passing through the center O of the circle is traced and the traced area K is outside the erase snap range near the center O of the circle, the trace is performed. If only the touched area is erased (Fig. 5 (b)), and the traced area K is within the erase snap range near the center O of the circle (Fig. 5 (c)), the circle from the end of the traced area Up to the center O (the erasure reference point) is erased (Fig. 5 (d)). In the above example, when erasing a part between the start point and end point of the line segment, the line segment is divided. However, when erasing the line segment from the start point to the midpoint or from the midpoint to the end point, the figure is not divided and the line segment excluding the erasure area is simply drawn.

Next, the erasing process will be described using a circle as an example of a closed figure. FIG. 6 is a diagram illustrating an example in which a circle and a straight line intersect and part of an arc is deleted. 丄.

The circle and the line segment L intersect at Ql and Q2, each intersection is the erasure reference point, select the graphical erasure mode, and set the erasure snap range. Here, when the arc C is traced with the cursor (Fig. 6 (a)), the computer recognizes that this figure is a closed figure, and at the same time, calculates the coordinates of the point sequence of the traced area K (the thick line in the figure). Then, it is determined whether or not the region K intersects with a predetermined range near the intersection, and the circle is subjected to a graphic change process. In this example, the traced area K intersects the erase snap range near the intersections Q 1 and Q 2, so that the intersection Q 1 is the start point, the intersection Q 2 is the end point, and the center O is the drawing reference point and the radius is the same as the circle. Change the shape to an arc (Fig. 6 (b)). Thus, the portion of the arc C from the intersections Q1 to Q2 is deleted.

FIG. 7 is a diagram illustrating an example of changing a circle into two arcs. In this example, as shown in Fig. 7 (a), the tracing is performed linearly so as to pass through the center of the circle, and as shown in Fig. 7 (b), the intersection Q1 between the tracing straight line K and the circle is obtained. The shape is changed to two arcs with Q2 as the start point, end point, and center O as the drawing reference point. In FIG. 7 (b), for clarity, the example is illustrated by Δ τ from the actual distance. In the example of the description, the traced portion is erased by tracing along the figure with an eraser. However, the operation of tracing along the figure may be complicated. Therefore, in the present invention, as shown in FIG. 8, for example, when it is desired to erase the line segment Α, when the trajectory of the eraser passes through the start point Ρ and the end point Q, it may be erased.

<Partial deletion of ellipse> U

For ellipses, if the center of the figure is determined in the same way as a circle, the figure (circumference of the figure) is calculated as a single solution and the slope of the figure is added as a parameter. It is possible to set a reference point. The ellipse is determined by the length of the short axis and the length of the long axis. Set the intersection of the short axis and long axis as the erase reference point and set the erase snap range. Therefore, the ellipse partial elimination method is the same as the circle elimination method.

<Erasing by Grid> FIG. 9 is a diagram illustrating an example of erasing by a grid. The grid has an erasure snap range set, and the erasure reference point at the center is a virtual point (coordinate) for drawing and editing, and is arranged at regular intervals G (X, Y). Line segment AB is located at G11-14, and similarly, line segment CD and EF are located at G21-24 and G31-34 (Fig. 9 (a)). Next, an eraser operation (K) is performed on each line segment. For line AB, from the erase snap range of G11 to G12, for line CD, from the erase snap range of G22 to the erase snap range of G23, for line EF On the other hand, from the erase snap range of G31 to the erase snap range of G31 to the middle point of G31G32 (FIG. 9 (b)). Then, each line segment is as follows. Line segment AB is a straight line from G12 to G14, line segment CD is divided into two straight lines from G21 to G22 and G23 to G24, and line segment EF is G31 and G A straight line from the middle of 32 to G34 (Fig. 9 (c)).

<Figure erase flow> . ₀

Next, the figure erasure processing flow of the present invention will be described with reference to FIG.

This processing starts when the erase mode is set by the erase command. The figure to be erased is determined from the coordinates input by the eraser (step S1). Then, it is determined whether or not there is a figure in the erasing area input by the eraser (step S2). If there is no figure, the erasing process ends. If there is a figure in the erasure area, it is determined whether the figure has the same start point and end point (step S3). If the figure is not the same as a line segment, the eraser input coordinates are changed to the coordinates on the figure to be erased. (Step S 4), and figure division determination is performed (step S 5). This determination is made based on whether or not the line segment of the erasure area is a part between the start point and the end point. Next, it is determined whether or not the figure is to be divided (step S6). If the figure is to be divided, a dividing process is performed (step S7). If the start point and the end point are the same, such as a circle, similarly, the eraser input coordinates are converted to coordinates on the figure to be erased (step S8), and figure change processing is performed (step S9). Next, it is determined whether or not an erase snap area (snap) has been set (step S10). The center of the erase snap area (the erase reference point) is the intersection point of a figure, the center of a circle or ellipse, an arc or an elliptical arc, or a reference point for drawing a new figure such as a grid point. The snap area is set by the user's instruction. If the erase snap area (snap) has been set, the range of the erase snap is calculated (step S11). The erase snap range is calculated using the display scale as a parameter on the screen to be operated. In other words, when the display is reduced, the erase snap range is reduced, and when the display is enlarged, the erase snap range is increased. Next, it is determined whether the type of the erasure reference point is the intersection, the center, or the grid of the figure (step S12), and if it is the intersection (step S13), and if it is the center. (Step S14) In the case of a grid (Step S15), the drawing coordinates are calculated. In this process, when the erase area and the erase snap range overlap, the erase reference point is used as the drawing reference point, and when the erase area and the erase snap area do not overlap, the erase area is used as the drawing reference point. . If the erase snap is not set in step S10, the drawing coordinates are calculated based on the coordinates of the traced area. The graphic is erased by drawing the graphic based on the calculated drawing coordinates. In the above example, the size of the cursor for drawing the erasure area can be changed. By changing the size, the erasure operation can be performed efficiently. Further, a horizontal / vertical wipe operation may be used as the eraser operation. In other words, by selecting any two points and moving the line connecting the two points horizontally or vertically, the figure or part of the figure selected during the movement is erased. Is also good. Further, a rotary wipe operation may be used as the eraser operation. In other words, two arbitrary points may be selected, rotated about either of the two points, and the selected figure or part of the figure may be deleted during the movement. In the case of the horizontal / vertical wipe operation and the rotational wipe operation, as in the above embodiment, the erasing process may be performed by setting the erasing reference point and the erasing snap range, or all overlapping graphics may be erased. Good. If it is desired to delete all the figures, the figure may be selected and deleted. .

14

Advantageous Effects of the Invention As described above, according to the present invention, a writing operation and an erasing operation can be performed with the same operation feeling. It is possible to select the erase from the traced part to the erase reference point or the erase from the erase reference point to the erase reference point. The erasure area can be selected, and operability can be improved.

Claims

The scope of the claims

1. In a system for editing a figure by handwriting input, a handwriting input means for inputting a region to be edited;

Figure determining means for determining whether the start point and the end point of the figure to be edited are the same,

Determines whether or not to divide according to the result of figure determination and the editing target area, and divides or changes the figure. Figure division and change processing means, and whether or not the figure erase snap range is set Drawing coordinate calculation means for determining the type of the drawing, determining whether or not the edit target area is within the erase snap range, and calculating drawing coordinates;

And a drawing means for inserting and updating a figure based on the calculated drawing coordinates.

2. The handwritten input figure editing system according to claim 1, wherein the size of the erase snap range is changeable.