JPH0250776A - Coordinate transforming type automatic preparation converting system for graphic plotting instruction strings - Google Patents

Abstract

PURPOSE:To put fitly a plotted graphic plotted at free size in a device depending picture frame by modifying automatically and reconverting a coordinate converting expression so that a device depending graph drawn by the converted graph picture drawing instruction column of device depending may be just put in the device depending picture frame. CONSTITUTION:A graphic data converting processing means 3 converts the graphic plotting instruction string independent of a device stored in a first storing means 1 into the graphic plotting instruction string depending on the device according to a coordinate converting expression, and a coordinate converting expression modifying processing means 4 modifies the coordinate converting expression so that the graphic plotted by the graphic plotting instruction string depending on the device converted by the graphic data converting processing means 3 may be fitly put in the frame of the graphic plotting range at the coordinate system depending on the device, and returns control to the graphic data converting processing means 3. Then, a graphic output device 5 outputs the plotted graphic based on the graphic plotting instruction string depending on the device converted by the graphic data converting processing means 3. Thus, a graphic plotted at free size can be fitly put in the frame of the graphic plotting range at the coordinate system depending on the device.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for converting a graphic drawing command sequence including coordinate values on a device-independent coordinate system (hereinafter referred to as a device-independent graphic drawing command sequence) into device-dependent coordinates. It is converted into a graphic drawing command sequence containing coordinate values on the system (hereinafter referred to as a device-dependent graphic drawing command sequence) and sent to the CRT.
(Cathode RayTube), X
The present invention relates to a method for converting a graphic drawing command string to be output to a graphic output device such as a Y plotter or a Japanese printer, and particularly relates to a method for automatically creating a coordinate conversion formula for a graphic drawing command string.

[Conventional technology]

Conventionally, in this type of conversion method for drawing command sequences, the program creator who draws the drawing defines in advance a window value on a device-independent coordinate system for creating a coordinate transformation formula, and then converts the defined window value. Drawing is performed using a window frame (picture frame) defined by , and coordinate transformation is performed by creating a coordinate transformation formula based on the window frame and the frame of the figure drawing range in a device-dependent coordinate system.

[Problem to be solved by the invention]

In the above-mentioned conventional method for converting graphic drawing command sequences, the program creator who draws the graphic must define the window value on the device-independent coordinate system in advance. This method has the disadvantage that it is troublesome as it is necessary to constantly draw figures consciously.

In view of the above-mentioned points, an object of the present invention is to eliminate the need to be aware of the window frame in a device-independent coordinate system when creating a program that draws a figure, and to draw a figure of any size without being aware of the window frame in a device-independent coordinate system. By re-creating a coordinate transformation formula so that it fits exactly within the frame of the figure drawing range in the coordinate system and performing coordinate transformation again based on the coordinate transformation formula, the drawn figure can be converted to the figure drawing range in the device-dependent coordinate system. An object of the present invention is to provide a coordinate conversion type automatic creation conversion method for a graphic drawing command sequence that can be output to a graphic output device so as to fit exactly within the frame.

[Means to solve the problem]

The automatic coordinate conversion formula creation conversion method for a graphic drawing command string of the present invention is a method for converting a graphic drawing command string that is device-independent into a device-dependent graphic drawing command string. a first storage means in which a graphic drawing instruction sequence is stored; a second storage means in which coordinate definition values defining a frame of a graphic drawing range in a device-dependent coordinate system are stored; A graphic data conversion processing means that converts a stored device-independent graphic drawing command string into a device-dependent graphic drawing command string according to a coordinate transformation formula, and a device-dependent graphic drawing command string converted by this graphic data conversion processing means. a coordinate conversion formula correction processing means for correcting a coordinate transformation formula so that the drawn figure to be drawn is exactly within a frame of a figure drawing range in a device-dependent coordinate system and returning control to the figure data conversion processing means; The graphics output device outputs a drawn graphic based on a device-dependent graphic drawing command sequence converted by the data conversion processing means.

[Effect]

In the automatic coordinate conversion formula creation conversion method for a graphic drawing command string of the present invention, a device-independent graphic drawing command string to be converted is stored in a first storage means, and a device-dependent coordinate system is stored in a second storage means. The coordinate definition values that define the frame of the drawing range are stored,
The graphic data conversion processing means converts the device-independent graphic drawing command sequence stored in the first storage means into a device-dependent graphic drawing command sequence according to the coordinate conversion formula, and the coordinate conversion formula correction processing means converts the device-independent graphic drawing command sequence stored in the first storage means into a device-dependent graphic drawing command sequence Modify the coordinate conversion formula so that the drawn figure drawn by the device-dependent figure drawing command sequence converted by the above fits exactly within the frame of the figure drawing range in the device-dependent coordinate system, and return control to the figure data conversion processing means. , the graphic output device outputs a drawn graphic based on the device-dependent graphic drawing command sequence converted by the graphic data conversion processing means.

〔Example〕

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a coordinate conversion type automatic creation conversion method for a graphic drawing command sequence according to an embodiment of the present invention.

The coordinate conversion formula automatic creation conversion method for a graphic drawing instruction sequence of this embodiment includes a first storage means 1, a second storage means 2, a graphic data conversion processing means 3, and a coordinate transformation formula correction processing means 4. , a graphic output device 5, and a register 6.

The first storage means 1 is set, for example, on a memory (not shown), and stores a device-independent graphic drawing command string to be converted into a device-dependent graphic drawing command string.

The second storage means 2 is also set, for example, in a memory, and is a frame for drawing a figure in a device-dependent coordinate system (hereinafter referred to as a device-dependent picture frame). Coordinate definition values that define the range frame (hereinafter referred to as device-independent image frame definition values; on the other hand, coordinate definition values that define the device-independent image frame are referred to as device-independent image frame definition values) Stored.

The graphic data conversion processing means 3 extracts a sequence of device-independent graphic drawing instructions stored in the first storage device l one by one, and coordinates on a device-independent coordinate system included in the retrieved device-independent graphic drawing commands. value (hereinafter referred to as device-independent coordinate value)
is converted into coordinate values on a device-dependent coordinate system (hereinafter referred to as device-dependent coordinate values) according to the coordinate conversion formula, converting device-independent figure drawing commands into device-dependent figure drawing commands, and converting this into device-dependent figure drawing commands for all instructions. By repeating the process, a device-independent graphic drawing command string is converted into a device-dependent graphic drawing command string.

Referring to FIG. 2, the processing in the graphic data conversion processing means 3 includes a coordinate conversion formula creation step SIO, an l command input step 320, an all command completion determination step 330, a coordinate value conversion step S40, and a device independent graphic Minimum/maximum value and device-dependent figure minimum/maximum value storage step S5
0, a graphic drawing command conversion step S60, a coordinate conversion formula correction processing means calling step 370, a reconversion flag determination step 380, a graphic drawing command reading position initialization step 390, and a graphic output step 5100.

The coordinate conversion formula correction processing means 4 uses the device-independent figure amount tJ maximum value and device-dependent figure minimum and maximum values set in the register 6 by the figure data conversion processing means 3, the device-independent image frame amount tJ maximum value, and the device A figure (hereinafter referred to as a device-dependent figure) drawn by a device-dependent figure drawing command sequence converted by the figure data conversion processing means 3 based on the minimum and maximum values of the dependent image frame.On the other hand, a device-independent figure Checks whether the figure drawn by a sequence of drawing commands (called a device-independent figure) fits exactly in the device-dependent picture frame, and if it does not, sets the minimum and maximum device-dependent picture frames so that it fits exactly. After correcting the values and turning on the reconversion flag, the corrected device-dependent image frame minimum and maximum values are sent to the graphic data conversion processing means 3 along with the reconversion flag.
Return it to.

Referring to FIG. 3, the processing in the coordinate transformation formula correction processing means 4 includes a re-conversion flag off step 5110, a device-dependent image frame minimum/maximum value initialization step 5120, and a maximum X coordinate value of the device-dependent amount. Comparison step 5130 and device-dependent image frame amount lj maximum X coordinate 4tL correction step S
140, re-conversion flag on step 3150, device-dependent minimum/maximum Y coordinate value comparison step 8160, device-dependent image frame minimum/maximum Y-coordinate value correction step S170
, a re-conversion flag on step 5180, and a device-dependent image frame amount/J maximum value changing step 190.

The graphic output device 5 is constituted by, for example, a CRT, and outputs a graphic by decoding the device-dependent graphic drawing instruction string received from the graphic data conversion processing means 3.

Next, an explanation will be given of the operation of the coordinate conversion type automatic creation conversion method for a graphic drawing command sequence according to the present embodiment configured as described above.

A device-independent figure drawing command sequence created by an application program (not shown) or the like is stored in the first storage means 1.
is stored in Note that in this embodiment, the first storage means l
For example, as shown in FIG. 4+al, it is assumed that a plurality of line segment drawing commands, which are one of the figure drawing commands, are stored. As shown in FIG. 4 (bl), each line segment drawing command includes a line segment drawing command code, the length of the argument (Il), a plurality of (n in the figure: n is a positive integer a) X coordinate values, and Y
It is composed of a set of coordinate values (XI, Yl), -, (Xn, Yn), and a set of 'fM number of X coordinate values and Y coordinate values (XI, Yl), -, (Xn, Yn). This is an instruction to draw a figure connecting each point shown by . Hereinafter, the X and Y coordinate values in the device-independent coordinate system will be represented by Wxa and Wya, and the X and Y coordinate values in the device-dependent coordinate system will be represented by Dxa and [)ya.

Similarly, device-dependent image frame definition values are stored in the second storage means 2. In this embodiment, the second storage means 2 stores a device-dependent image frame minimum X-coordinate definition value DXMINO and a device-dependent image frame maximum X-coordinate definition value as device-dependent image frame definition values, as shown in FIG. 5, for example. DXMAXO, . . . A device-dependent image frame minimum Y-coordinate definition value DYMINO and a device-dependent image frame maximum Y-coordinate definition value DYMAXO are stored. Note that the device independent image frame minimum X coordinate definition value W is the device independent image frame definition value.
XM I N O, device independent image frame maximum X coordinate definition value WX
MAXO, device independent image frame minimum Y coordinate definition value wyMINO
and device independent image frame maximum Y coordinate definition value WYMAXO, but in this embodiment, as described later, 0. 0. 1
．． 0. 0. 0 and 1.0 respectively.

Next, the graphic data conversion processing means 3 is activated, and the graphic data conversion processing means 3 converts the device independent image frame definition value (WXMIN
O, WXMAXO, WYMINOWYMAXO) to 0.
0,1.0. O, O, and 1.0 respectively, and the device-dependent image frame definition value (DXMINO) is stored from the second storage means 2.
, DXMAXO, DYMINO, DYMAXO), and obtain the device independent image frame minimum and maximum values (WXMIN, WXMAX
.

WYMIN, WYMAX) and device-dependent image frame minimum/maximum values (DXMIN, DXMAX, DYMIN, DYMA
X) to create a coordinate transformation formula (step 310).

In detail, a coordinate transformation formula is used to transform the X and Y coordinate values of a point on a device-independent coordinate system into the
This is the calculation formula for converting to coordinate values and Y coordinate values,
For example, as shown in FIG. 6, point A on the device-independent coordinate system
Let A' (Dxa, Dya) be the point where (Wxa, Wya) is transformed into the device-dependent coordinate system, then the point A°
The X coordinate value Dxa and Y coordinate value Dya are Dxam (DXMAX-DXMIN)x (Wx a
-WXM I N) ÷ (WXMAX-WXMIN) +DXMIN ...■Dya= (D
YMAX-DYMIN)x (Wy a-WYM I
N) ÷ (WYMAX-WYMIN) +DYM I N ...■, and the above formulas (■) and (2) are coordinate conversion formulas.

Based on the previous assumption, WXMrN, WXMAX.

0 for WYMIN and WYMAX. 0. 1. Substituting 0°0.0 and 1.0 respectively, Dxam
(DXMAX-DXMIN)XWx a +l)XM
IN...■.

Dyam (DYMAX-DYMIN)×Wya+DY
MIN ・ ・ ・■ is obtained.

Next, the graphic data conversion processing means 3 inputs one command from the first storage means 1 (step 520), and determines whether processing of all commands has been completed (step 53).
0) If the processing of all commands has not been completed, the graphic data conversion processing means 3 converts all device-independent X coordinate values Wxa and device-independent Y coordinate values Wxa in the input command.
Convert ya to device-dependent X coordinate value Dxa and device-dependent Y coordinate value Dya using coordinate conversion formulas ■'' and ■゛ (
step 340). At this time, the device-independent X-coordinate value Wxa, the device-independent Y-coordinate value Wya, and the device-dependent X-coordinate value Dxa
and the device-dependent Y coordinate value Dya, the minimum and maximum values are the device-independent figure minimum and maximum values (Wx a t, Wx a m, Wy a t), which are work variables.

Wyam) and device-dependent graphical minimum and maximum values (Dxa
i, Dxam, Dya i, Dyam) (step 350).

Next, the graphic data conversion processing means 3 converts the device-independent line segment drawing command into a device-dependent line segment drawing command (step 560), and returns to step 320 to store the device-independent line segment drawing command in the first storage means 1.
Repeat the process of reading instructions from.

In step 30, when the conversion processing of all the instructions of the device-independent line segment drawing command string stored in the first storage means l into the device-dependent figure drawing command string is completed, the graphic data conversion processing means 3 is the device independent figure amount/Ji maximum value (W
xa i, Wxam, Wyai, Wyam) and device dependent graphic amount/JX-maximum value (Dxa t, Dxam,
Dya i, Dyam) and the maximum value of device independent image frame amount (WXMIN, WXMAX, WYMIN, WYM
AX) and device-dependent X-coordinate value J maximum value (DXMIN
, DXMAX.

DYMIN, DYMAX) in register 6,
Coordinate transformation formula correction processing means 4 is called (step 570
).

The coordinate transformation formula correction processing means 4 first calculates the device-independent figure quantity zJ passed through the register 6 (Wxa t, W
xam, Wyat, Wyam) and the maximum value of the device-dependent graphic amount (Dxai, Dxam).

Dyai, Dyam) and device independent image frame minimum and maximum values (
WXMIN, WXMAX, WYMIN, WYMAX) and device-dependent image frame minimum/maximum values (DXMIN, DXMA
New device-dependent image frame minimum and maximum values (DXMIN, DXMAX
, DYMIN, DYMAX).

Specifically, the coordinate conversion formula correction processing means 4 first turns off the re-conversion flag (step 3110), and sets the device-dependent image frame amount 4 to the maximum value (DXMIN, DXMAX, DYMIN).
, DYMAX) to leak variables (Dxmin, Dxmax
, Dym1n, Dymax), respectively (step 5120).

Next, the coordinate transformation formula correction processing means 4 calculates Dxa i=DX
Determine whether MIN and Dxam=DXMAX (step 3130), Dxa i=DXMIN
And if Dxam=DXMAX, it means that the left and right ends of the device-dependent figure are not exactly within the device-dependent image frame, as shown in FIG. 7 (al), so pxai-DXMIN and D a m = D
In order to change DXMIN and DXMAX so that they are coordinate transformed to X M A X, from the coordinate transformation formula
ai+Dxmin and DXMAX= (Dxmax-Dxmin)xWxam
xmin and Dxmax are determined so that +Dxmin is satisfied. That is, by solving the simultaneous equations consisting of the following two equations, Dxmin= (DXMIX =Wxam−DXMAX
-Wxa i)+ (Wxam-Wxai).

(However, Wxam-Wxai≠0) Dxmax= (Dxmin-Wxai+DXMIN-
I) xmin)'-, Wxa i (where Wxai
#Q) is determined (step 3140), and the reconversion flag is turned on (step 5150). If Dxai=DXMIN and Dxam=DXMAX in step 5130, the left and right ends of the device-dependent figure are device-dependent This means that it fits exactly within the frame, so step 5
Skip I40 and 5150.

Subsequently, the coordinate transformation formula correction processing means 4 calculates Dyai=DY
Determine whether MIN and Dyam=DYMAX (step 5160), Dyam=DYMI
If N and Dyam=DYMAX, it means that the upper and lower ends of the device-dependent figure are not exactly within the device-dependent image frame, as shown in FIG. 7 (al), so [) yai= DYMfN and Dyam=DYM
DYMIN and DYMA to be coordinate transformed with AX
To change X, from the coordinate transformation formula ■°, DYMIN= (Dymax-Dymin)xWyai
+Dym1n and DYMAX= (Dymax-Dymin)xWya
Find ymin and Dymax so that m+Dym1n.

That is, by solving the simultaneous equations consisting of the above two equations, Dym1 n-(DYMIX-Wyam-DYMAX-
Wy a +) + (Wy am-Wya+).

(However, Wyam-Wyai≠0) Dymax= (Dymin-Wyai+DYMIN
−Dymin) ÷Wya i (where Wyai≠0) is calculated (step s+70), and the reconversion flag is turned on (step 5180). In step S160, Dy
If ai=DYMIN and Dyam=DYMAX, this means that the upper and lower ends of the device-dependent figure are exactly within the device-dependent picture frame, so step S17
Skip 0 and 5180.

Finally, the coordinate transformation formula correction processing means 4 processes the work variable (D
xmin, Dxmax, Dym1n, Dymax) to device-dependent image frame minimum and maximum values (DXMIN, DXMAX)
, DYMIN, DYMAX) (step 3190), and the maximum value (D
XMIN, DXMAX.

DYMIN, DYMAX) and a reconversion flag are set in the register 6, and control is returned to the graphic data conversion processing means 3 which is the calling source.

The graphic data conversion processing means 3, to which control has been returned from the coordinate transformation formula correction processing means 4, determines whether or not the re-conversion flag returned from the coordinate transformation formula correction processing means 4 via the register 6 is on. Step 580), if it is on, returns the reading position of the device-independent line segment drawing command to the first command of the device-independent line segment drawing command sequence stored in the first storage means l, and then returns to step S20. , first storage means 1
The process is re-executed from reading one instruction from .

If it is determined in step S80 that the reconversion flag is off, the coordinate transformation formula is corrected so that the device-dependent figure fits exactly within the device-dependent image frame, as shown in FIG. 7 (bl), for example. This means that the graphic data conversion processing means 3 sends the converted device-dependent line segment drawing command sequence to the graphic output device 5 to output the graphic (step 5100), and sends the device-independent line segment drawing command sequence to the graphic output device 5 (step 5100). The conversion process to a device-dependent line segment drawing command sequence ends.

In the above embodiment, a line segment drawing command is used as an example of the graphic drawing command, but it goes without saying that similar operations and effects can be obtained with other graphic drawing commands.

〔Effect of the invention〕

As explained above, in the process of converting a device-independent figure drawing instruction string into a device-dependent figure drawing instruction string, the device-dependent figure drawn by the converted device-dependent figure drawing instruction string is converted into a device-dependent figure drawing instruction string. By automatically modifying the coordinate transformation formula and re-converting so that it fits exactly in the frame, a drawn figure drawn at a free size can be placed exactly in the device-dependent image frame without being aware of the device-independent image frame. This has the effect of being able to be output to a graphic output device in a manner that fits.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a coordinate conversion type automatic creation conversion method for a graphic a drawing instruction sequence according to an embodiment of the present invention, and FIG. 2 shows an example of the processing of the graphic data conversion processing means in FIG. FIG. 3 is a flowchart showing an example of the processing of the coordinate transformation formula correction processing means in FIG. 1, and FIGS. 4(a) and (b) show line segment 5 is a diagram showing a state in which a drawing command sequence is stored and the format of a line segment drawing command; FIG. 5 is a diagram showing a state in which device-dependent image frame definition values are stored in the second storage means in FIG. 1; FIG. 6 is a diagram for explaining the coordinate conversion process in the graphic data conversion processing means in FIG. 1, and FIG. There is a diagram illustrating a case where a device-dependent figure that does not fit exactly in the device-dependent image frame is corrected and outputted so that it fits exactly in the device-dependent image frame. , 2... Second notation 1α means, 3... Graphic data conversion processing means, 4... Coordinate transformation formula correction processing means, 5... Graphic output device, 6... Register.Patent Applicant L1 Hon Electric Co., Ltd.

Claims (1)

[Scope of Claims] In a graphics drawing instruction string conversion method for converting a device-independent graphics drawing instruction string into a device-dependent drawing instruction string, the first step in which the device-independent drawing instruction string to be converted is stored
a second storage means in which coordinate definition values defining the frame of a figure drawing range in a device-dependent coordinate system are stored; and a device-independent figure drawing command sequence stored in the first storage means. a graphic data conversion processing means that converts the image into a device-dependent graphic drawing command sequence according to a coordinate transformation formula; a coordinate transformation formula correction processing means that modifies the coordinate transformation formula so that it fits exactly within the frame of the graphic drawing range in the figure data conversion processing means, and returns control to the graphic data conversion processing means; 1. A coordinate conversion type automatic creation conversion method for a graphic drawing command sequence, comprising a graphic output device that outputs a drawn graphic based on a graphic drawing command sequence.