JPH07200853A - Graphic deforming device - Google Patents

Abstract

PURPOSE:To provide a graphic deforming device which can deform an optional line drawing with only a small quantity of information on the deformation and also can easily produce this information in an image processing mode. CONSTITUTION:A user deforms a fan shape which encloses a straight line 1 including points P1 and P2 showing a line drawing graphic in oder to deform the line 1, into a straight line 1'. Then, the positions of points P1' end P2' which form a deformed line drawing graphic are calculated so that theta:alpha=theta':alpha' and theta:beta+theta':beta' are satisfiend and also OP1= OP1' and OP''=OP2' are satisfied in the undeformed and deformed states as shown in (a) and (b), respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphic transformation device capable of transforming an arbitrary line drawing in image processing.

[0002]

2. Description of the Related Art In computer image processing, a lot of processing is performed for transforming a line drawing drawn by a point drawing, a straight line, a curve function or the like for the purpose of performing animation processing.

However, conventionally, in order to deform a line drawing, the deformation information of each point forming the line drawing, the deformation information of the start point and the end point of each straight line, or the deformation information of each parameter of the curve function is required. Even a line drawing has a problem that a large amount of data is required to deform it.

An object of the present invention is to make it possible to transform an arbitrary line drawing with a small amount of transformation information and to facilitate the creation of the transformation information.

[0005]

The present invention firstly has graphic display means (display device 104) for displaying a line drawing graphic.

Next, on the display screen of the graphic display means, a frame determining means (FIG. 2 executed by the CPU 101 for determining an arbitrary fan-shaped frame surrounding the line drawing figure).
202).

Next, there is a frame deforming unit (step 203 in FIG. 2 executed by the CPU 101) for deforming the fan-shaped frame determined by the frame determining unit on the display screen of the graphic display unit.

Then, the graphic transformation calculation means for transforming the line drawing graphic based on the positional relationship and the angular relationship between the fan-shaped frame before the deformation determined by the frame determining means and the fan-shaped frame after the deformation by the frame deforming means. (CPU1
2 is executed by step 01). Here, the above-mentioned figure transformation calculation means, for example, in a state where the radius of the fan-shaped frame is fixed, configures the fan-shaped angle in the fan-shaped frame before transformation and the line drawing figure inside the fan-shaped frame before transformation. The ratio of the angle connecting the point to the center point of the sector before deformation and the angle of the sides forming the two radii of the sector before deformation is the angle of the sector in the frame of the sector after deformation and the angle of the sector after deformation. The two radii of the post-deformation fan and the side connecting the point inside the frame corresponding to the point forming the line drawing figure inside the fan-shaped frame before the deformation and the center point of the post-deformation fan The distance between the point that is equal to the side angle and that constitutes the line drawing figure inside the fan-shaped frame before deformation and the center point of the fan-shaped frame before deformation is the point inside the fan-shaped frame after deformation. The line drawing figure inside the fan-shaped frame before transformation Configure the line drawing shape inside the fan frame before deformation so that it is equal to the distance between the corresponding point and the center point of the fan frame after deformation. Calculate the point corresponding to the point. Alternatively, the above-described graphic deformation calculation means, for example, on the display screen of the graphic display means, the fan-shaped angle in the fan-shaped frame before the deformation, and the point and the deformation that constitute the line drawing figure inside the fan-shaped frame before the deformation. The ratio of the angle connecting the center point of the previous sector and the angle of the sides forming the two radii of the sector before deformation is the angle of the sector in the sector after deformation and the angle of the inside of the frame after transformation. A point that corresponds to a point that forms a line drawing figure inside a fan-shaped frame before deformation and an angle that connects a point that connects the center point of the fan after deformation and two sides that form two radii of the fan after deformation Equal to the ratio of
In addition, the ratio of the radius of the fan-shaped frame before deformation and the distance between the points forming the line drawing figure inside the fan-shaped frame before deformation and the center point of the fan-shaped frame before deformation is the radius of the fan-shaped frame after deformation. , So that the ratio is equal to the distance between the point inside the fan-shaped frame after deformation and the point corresponding to the point forming the line drawing figure inside the fan-shaped frame before deformation and the center point of the fan-shaped frame before deformation. Then, the points inside the fan-shaped frame after the deformation and corresponding to the points forming the line drawing figure inside the fan-shaped frame before the transformation are calculated.

[0009]

The deformation information of the line drawing figure can be created only by the positional relationship and the angular relationship between the fan-shaped frame before the deformation determined by the frame determining means and the fan-shaped frame after the deformation by the frame deforming means. The amount of transformation processing is small.

Further, the deformation of the line drawing figure can be easily realized only by deforming the line drawing figure so that such positional relationship and angle are preserved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Two embodiments of the present invention will be described in detail below with reference to the drawings. First Embodiment FIG. 1 is a configuration diagram of a first embodiment of a graphic transformation device.

The CPU 101 operates while using the RAM 103 as a work memory according to a control program stored in the ROM 102, and controls all operations for deforming the figure.

The display device 104 is, for example, a CRT display for displaying a figure before transformation and a figure after transformation. In this case, a point function of a display position with a mouse or the like for enclosing a figure in a fan-shaped frame (described later) is also included.

FIG. 2 is an operation flow chart showing an outline of the graphic transformation process in the first embodiment. First, in step 201, the user selects an original figure to be transformed on the display device 104. Specifically, the user
The original cursor is selected by moving the mouse cursor displayed on the display device 104 to the original figure (line drawing) to be selected and clicking the mouse button. Or
The user may enclose a range including a plurality of original figures (line drawings) with a box using a mouse. In response to this, the CPU 101 causes the coordinate values of the selected original graphic on the graphic data developed on the RAM 103,
Specifically, each coordinate value forming the selected line drawing is calculated. As a result of these processes, for example, as shown in FIG. 3 (a), the straight line figure 1 having the points P1 and P2 at both ends is selected, the coordinate values of the points P1 and P2 are calculated, and the RAM 103
Held in.

Next, in step 202, the user determines, on the display device 104, a fan-shaped frame surrounding the original graphic selected in step 201. Specifically, the user uses the mouse cursor displayed on the display device 104 to display, for example, the fan-shaped central point O shown in FIG. A, B
By clicking and dragging each of the two, the fan-shaped frame that completely includes the original figure selected in step 201 is determined. In response to this, the CPU 101
On the graphic data developed on the RAM 103, the coordinates of the central point O of the sector and the other two points A and B that form the determined frame are calculated and stored in the RAM 103.

Next, in step 203, the user transforms the frame determined in step 202 on the display device 104. Specifically, the user clicks the mouse button on two points other than the center point of the fan-shaped frame determined in step 202, for example, each point A and B in FIG. Release the mouse button after dragging to. As a result, in response to this, the CPU 101 calculates the coordinate values of two new points other than the center point of the transformed fan-shaped frame on the graphic data developed on the RAM 103, and stores them in the RAM 103. At the same time, it is displayed on the display device 104. In this case, the coordinates of the center point O of the fan-shaped frame do not change, and the radius of the fan-shaped frame does not change.

In step 204, the CPU 101 holds the RAM 103 in step 202, for example, as shown in FIG.
Based on the positional relationship and angular relationship between the untransformed fan-shaped frame of FIG. 3A and the transformed fan-shaped frame of FIG. 3A, the original figure stored in the RAM 103 in step 201 is configured, for example, as shown in FIG. By transforming the coordinate values of the points P1 and P2 in a), for example, the point P1 ′ shown in FIG.
Calculate P2 '.

In step 205, the CPU 101
Is the point P calculated in step 204, for example, in FIG.
1 ′ and P2 ′ are the transformed figures l ′,
It is displayed on the display device 104.

Next, the specific processing of the graphic transformation operation in step 204 will be described. For example, in FIG. 3 (a), the angle of the sector and the side connecting the center point O with the points P1 and P2 inside the sector forming the straight line 1 which is the original figure and the side forming the two radii of the sector. Each angle is defined as shown by the following equation.

[0020]

[Equation 1]

Next, two points A other than the center point O of the original fan shape,
When B is moved to two new points A ′ and B ′, the angles θ, α, and β shown in Equation 1 are changed to angles θ ′, α ′, and
Suppose it has changed to β '. The limiting conditions in this case are the angle of the fan shape before and after the deformation, the angle of the side connecting the points inside the fan forming the line drawing figure and the center point, and the side forming the two radii of the fan shape before the deformation. And the ratio is equal. That is,
The following equation holds.

[0022]

[Equation 2]

Here, the angles θ, α, and β are known because they are angles with respect to the fan shape before deformation, and the angle θ ′ is known.
Is also known because it is the angle formed by the center point O and the two determined points A ′ and B ′ of the deformed sector. Therefore, the angles α ′ and β ′ are calculated by the equation (2).

Here, a restriction condition is added that the radius between the center point of the fan shape and each point forming the line drawing figure does not change before and after the deformation. That is, the following equation is established.

[0025]

[Equation 3]

Therefore, the points on the sides at the angles α'and β'from the sides OA 'and OB', respectively, which are at the distance from the center point O by the equation (3), are shown in FIG. The deformed points P1 'and P2' shown in 3 (b) are calculated.

As described above, the graphic transformation operation is realized. Second Embodiment Next, a second embodiment of the graphic transformation device will be described.

First, the structure of the second embodiment is shown in FIG. 1 as in the case of the first embodiment. Further, the outline of the graphic transformation processing in the second embodiment is also shown in FIG. 2 as in the case of the first embodiment.

Next, the operation of the second embodiment differs from the operation of the first embodiment in that in the frame modification process of step 203 of FIG. 2, the radius of the fan-shaped frame is the same as that of the first embodiment. Although not changing, the radius of the fan-shaped frame can be changed in the second embodiment.

Next, the specific processing of the graphic transformation operation of step 204 of FIG. 2 in the second embodiment will be described. For example, in FIG. 4A, the angle of the sector and the points P1 and P2 inside the sector forming the straight line 1 which is the original figure.
And the angle between the sides forming the two radii of the sector is expressed by the same formula 1 as in the case of the first embodiment.

Next, the limiting conditions for the pre-deformation angles θ, α and β and the post-deformation angles θ ′, α ′ and β ′ are also the same as in the case of the first embodiment, the formula 2 is established. That is. Therefore, the angles α ′ and β ′ are calculated by the equation (2).

Further, a restriction condition is added that the ratio of the radius of the fan shape to the distance between the center point of the fan shape and the points connecting the points forming the line drawing figure does not change before and after the deformation. That is, the following equation is established.

[0033]

[Equation 4]

Here, r and r'are the radii of the sector before and after the deformation. Therefore, the points on the sides at the angles α'and β'from the sides OA 'and OB', respectively, and the points at the respective distances calculated from the central point O by the equation 4 are shown in FIG. Points P1 'and P after deformation shown in (b)
2'is calculated.

The graphic transformation operation is realized as described above. By the graphic transformation processing of the first embodiment or the second embodiment described above, for example, as shown in FIG. 5, a line drawing graphic surrounded by a fan shape can be variously transformed.

[0036]

According to the present invention, only the positional relationship and the angular relationship between the fan-shaped frame before the deformation determined by the frame determining means and the fan-shaped frame after the deformation by the frame deforming means are defined as the line drawing figure. Since deformation information can be created,
The effect that the processing amount of the graphic transformation processing may be small is produced.

Further, the user can transform the line drawing figure by a simple operation of moving the three points forming the fan shape. Further, it is possible to easily realize the deformation of the line drawing figure only by changing the line drawing figure so that the positional relationship and the angle as described above are stored.

[Brief description of drawings]

FIG. 1 is an embodiment of a graphic transformation device (first and second embodiments).
It is a block diagram of.

FIG. 2 is an embodiment of a graphic transformation device (first and second embodiments).
3 is an operation flowchart showing the processing of FIG.

FIG. 3 is an explanatory diagram of a first embodiment of a graphic transformation device.

FIG. 4 is an explanatory diagram of a second embodiment of the graphic transformation device.

FIG. 5 is a diagram showing an operation example of the graphic transformation device.

[Explanation of symbols]

 101 CPU 102 ROM 103 RAM 104 Display Device

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location // G06F 17/50 7623-5L G06F 15/60 330

Claims (3)

[Claims] 1. A graphic display unit for displaying a line drawing graphic, a frame determining unit for deciding an arbitrary fan-shaped frame surrounding the line drawing graphic on the display screen of the graphic display unit, and a display screen for the graphic display unit. In the above, frame deforming means for deforming the fan-shaped frame determined by the frame determining means, a fan-shaped frame before deformation determined by the frame determining means, and a fan-shaped frame after being deformed by the frame deforming means. A graphic transformation device that transforms the line drawing graphic based on a positional relationship and an angular relationship with a frame, and a graphic modification apparatus. 2. The frame deforming means deforms the fan-shaped frame determined by the frame determining means so that a radius of the fan-shaped frame does not change, and the graphic-deformation calculating means causes the fan-shaped frame before the deformation. Of the angle of the sector, the side connecting the point forming the line drawing figure inside the frame of the sector before the deformation and the center point of the sector before the deformation, and the side forming the two radii of the sector before the deformation. The ratio of the angle is the angle of the sector in the sector frame after the deformation and the point inside the sector frame after the deformation that constitutes the line drawing figure inside the sector frame before the deformation. Is equal to the angle between the side connecting the center point of the deformed sector and the side forming the two radii of the transformed sector, and the inside of the sector frame before the transformation is The line drawing figure The distance between the formed point and the center point of the fan shape before the deformation corresponds to a point inside the fan shape frame after the deformation and constituting the line drawing figure inside the fan shape frame before the deformation. To be equal to the distance between the point and the center point of the transformed sector,
The point inside the fan-shaped frame after the deformation, which corresponds to the point forming the line drawing figure inside the fan-shaped frame before the deformation, is calculated. Graphic transformation device. 3. The graphic transformation calculation means configures, on the display screen of the graphic display means, a fan-shaped angle in the fan-shaped frame before the transformation and the line drawing figure inside the fan-shaped frame before the transformation. The ratio of the angle between the point connecting the center point of the fan shape before deformation and the angle of the sides forming two radii of the fan shape before deformation is the angle of the fan shape in the frame of the fan shape after deformation and the angle A point inside the subsequent fan-shaped frame, which corresponds to a point constituting the line drawing figure inside the fan-shaped frame before the deformation, and a side connecting the center point of the deformed fan-shaped frame and the deformed The radius of the fan-shaped frame before the deformation, the point that forms the line drawing figure inside the fan-shaped frame before the deformation, and the deformation. Distance of the center point of the previous sector Corresponds to the radius of the transformed fan-shaped frame and the points inside the transformed fan-shaped frame that form the line drawing figure inside the untransformed fan-shaped frame. The line drawing figure inside the fan-shaped frame before deformation is configured so that it becomes equal to the ratio of the distance between the point and the center point of the fan-shaped frame before deformation. The figure transformation device according to claim 1, wherein a point corresponding to the point is calculated.