JPH0366676B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a trend graph filling display method for realizing an area filling function in a trend graph display device that displays a trend graph using a graphic display. It is.

<Prior Art> When a group of data read from an external source is expressed as a time-series graph, a trend graph t as shown in FIG. 3a is often displayed on a CRT display device or the like.

For such a trend graph t, for example, there is a request to fill in that part in order to emphasize the part above a certain value y _H or below a certain value y _L , and the part shown by the diagonal line in Fig. 3b is generated. It has become desirable to have a technique for displaying images by filling them in.

Conventionally, the following method has been used to display such trend graphs in a filled manner.

As a premise for performing such a filling processing method, data to be displayed is prepared in a format as shown in FIG. 3c, with display values yo to yn corresponding to logical coordinates xo to xn of the horizontal axis x. For example, if a part of the display value y that exceeds a certain value yl is to be filled out, in order to detect the part to be filled out, all data yi (i=O to n) of the display value is compared with the certain value yl. There is a need.

The filling process method after comparing the displayed value yi and the constant value yl is explained below (1)
Two methods are commonly used: (2) Filling with a straight line drawing and using the closed area filling function.

(1) Filling by straight line drawing This filling method will be explained using FIG. 4.

Here, as shown in Figure 4a, when two points xi, x _i+1 on the adjacent logical x-axis coordinates are projected onto the physical x-axis coordinates on the CRT display device, the corresponding physical x
Dxi and Dx _i+1 on the axis coordinates are not adjacent to each other, and the logical x-axis coordinates xi and x _i+1 are divided and defined into m points of physical x-axis coordinates Dxio to Dxim.

Now, in the flowchart of FIG. 4b, a comparison operation is performed between the displayed values yi, y _i+1 and the constant value yl.

If yi≦yl and y _i+1 ≦yl, area collapse processing is not performed.

When yi>yl and y _i+1 >yl, connect (Dxij, f(Dxij)) and (Dxij, yl) with a straight line for j=O to m. However, f is 2 points (xi, yi), (x _i+1 , y _i+1 )
is a function that represents a straight line passing through .

If the relationship between the displayed values yi, y _i+1 and the constant value yl is other than the above, the physical coordinates of the intersection of the function f and the constant value yl
Ask for Dxik. And j=O~k or j
For =k~m, (Dxij, f(Dxij)), (Dxij,
yl) with a straight line.

In this way, the filling operation is performed by drawing a straight line.

(2) Use of closed area filling function This method compares the trend data group yo to yn shown in FIG. 3c with a constant value yl, finds the inner points, and fills in the closed area.

As shown in the flowchart of FIG. 5, first, the magnitude relationship between the display value yo and the constant value yl is memorized.
Then, the magnitude relationship between the display value yi and the constant value yl and the magnitude relationship between the display value y _i+1 and the constant value yl are sequentially compared.

When it is detected that y _i+1 < yi intersects yl,
Trend line, constant value yl (or trend frame)
Find the interior points of the closed area surrounded by , and fill in this closed area.

Next, memorize the magnitude relationship between the display value yi and the constant value yl, check whether all points have been completed, and if all points have been completed, {Y} is determined by comparing the final display value yn and the constant value yl. , the trend line, the constant value yl, and the trend frame.

By using the two methods explained above, you can
The graph was displayed and the areas above or below a certain value were filled in, but when using these (1) filling by straight line drawing or (2) closed area filling function, it is necessary to compare the displayed values, There was a problem in that the arithmetic processing for determining the interior points took time to actually complete the display, increasing the load on the host computer side. Furthermore, there is a problem in that the comparison processing and calculation processing described above when displaying a plurality of trend graphs at the same time further complicate the operations.

<Problems to be Solved by the Invention> As described above, the technical problems to be solved by the present invention are to simplify the value comparison processing and arithmetic processing to reduce the load on the host computer side, and to reduce the load on the host computer side. An object of the present invention is to prevent processing from becoming complicated even when displaying a trend graph of a book.
An object of the present invention is to realize a trend graph filling display method capable of displaying a trend graph retaining a filling function at high speed in a graphic display device.

<Means for solving the problem> The present invention for solving the above problem uses a trend graph that represents a data group as a time-series graph.
In the trend graph filling display method that displays a graph and fills in the closed area formed by the set boundary, (a) the trend frame is drawn with a margin larger than the trend graph display amount, and then filled. (b) a step of filling in a closed area surrounded by the trend frame and the boundary line with a color; (c) a step of drawing a trend graph; ) filling in a closed area composed of the trend graph, the trend frame, and the boundary line with an initialization color; and (e) filling the margin of the trend frame with an initialization color to make the trend frame a trend. This is a trend graph filling display method characterized by having a step of setting the trend graph in accordance with the graph display amount.

<Function> The trend graph filling display method of the present invention fills in advance a closed area surrounded by a trend frame and a boundary line with a fill color, and when displaying a trend graph, the trend graph, the trend frame, and the boundary line are filled in in advance. The closed area surrounded by the line is filled with the background color of the screen (the color when initialized), the trend frame is set again, and the area above or below a certain value in the trend graph is filled in.

<Embodiment> FIG. 1 shows a block diagram of a circuit configuration convenient for realizing the trend graph fill-in display method of the present invention.

In this figure, the area surrounded by dotted lines is the trend
This is a circuit that executes a graph filling operation; 1 is a host computer that transmits trend information; 2 is a receiving device that receives this trend information; 3 is a microprocessor that manages and controls this filling display device; 4 is a straight line drawing; A drawing processor that performs fill drawing, etc., 5 is a drawing switching switch, 6 ₁ is a first frame buffer, 6 ₂ is a second frame buffer, 7 is a display switching switch, and 8 is a drawing processor.
It is a CRT display device. Reference numeral 9 denotes a memory circuit that stores the procedure of the trend graph filling display method of the present invention.

In such a circuit configuration, the host computer 1
Based on the trend information given from the microprocessor 3, the microprocessor 3 starts operating according to the procedure stored in the memory circuit 9. First, for example, the contents of the frame buffer ₆₂ are displayed on the CRT display screen, the frame buffer ₆₁ is filled in, and when the drawing operation is finished, a switching operation is performed to display the contents of the frame buffer ₆₁ . , the next stage of filling drawing is started in the frame buffer ₆₂ .

Next, the procedure of the trend graph fill-in display method of the present invention stored in the memory circuit 9 will be specifically explained using the operation diagrams on the CRT display screen shown in FIGS. 2a to 2g.

This figure shows the drawing and display state of the frame buffers 6 ₁ and 6 ₂ , and the "O" mark indicates that the contents of the frame buffers are actually displayed on the CRT display device 8 . In this example, the frame buffer ₆₁ is used to fill in the trend graph.

First, as shown in FIG.
The two frame buffers 6 ₁ and 6 ₂ are initialized.
That is, the screen is drawn in one color, eg, "black." Then, the drawing changeover switch 5 is switched to the frame buffer ₆₁ , the display changeover switch 7 is switched to the frame buffer ₆₂ side, the drawing operation is started in the frame buffer ₆₁ , and the frame buffer is displayed on the CRT display screen 8. 6 Control so that ₂ is displayed.

Next, in b, the trend frame W is drawn in, for example, "blue". At this time, the upper limit line of the trend frame W is set to the maximum value y _nax +2 of the display data y, and a margin for the filling operation is taken.
Then, the boundary line yl used to fill in the trend graph is drawn in, for example, "purple".

In step (c), the portion of the trend graph to be displayed that is above the boundary line yl is filled in using a color to be filled, for example, "red." In other words, the interior point (xi, y _nax ) of the closed area surrounded by the trend frame w and the boundary line yl
Specify to perform a "red" fill operation.
In step (d), two trend graphs t ₁ "green" and t ₂ "yellow" are created from the data given from host computer 1.
Display. The number of trend graphs is not limited to two, but any number is acceptable.

In step (e) _{, the} interior points (xi, y _nax +1) and fill this closed area with "black".

Step (f) is a resetting operation of the trend frame w, and the upper limit line of the trend frame y = y _nax +2 is drawn (filled) in a straight line with the color "black" when the screen is initialized, and immediately after that Lower line y = y _nax +
Similarly, draw (fill in) a straight line in "black" for 1. And maximum value y of trend display data =
Draw (fill) the y _nax line in a straight line using the color "blue" that makes up the trend frame.

This operation is an operation for returning the upper limit line y=y _nax +2 of the trend frame w set in step (b) to the upper limit line y=y _nax of the trend frame normally displayed.

That is, in step (e), if the upper limit line y of the trend frame w = y _nax , when filling the closed area surrounded by the trend frame w, the trend graphs t ₁ , t ₂ , and the boundary line yl, the trend If the maximum value of the display data of either graph t ₁ or t ₂ is y _nax , the trend graph will come into contact with the trend frame w, and the closed area will be divided to be filled in. This avoids complicating the filling process. This is a processing operation.

Step (g) represents the frame buffer ₆₁ that has been filled in as described above.

Finally, under the control of the microprocessor 3, the display switching switch 7 is switched to the frame buffer ₆₁ , the drawing switching switch 5 is switched to the frame buffer ₆₂ , and the CRT display screen 8 is filled in. At the same time the trend graph is displayed, the trend graph for the next stage is displayed.
Graph filling processing is performed according to the above operations. Therefore, it is possible to fill out a moving trend graph.

In addition, in this explanation, we explained the filling process for trend data above a certain value yl, but this method is not limited to this, and it is easy to use this method even when filling out data below a certain value. The method of the present invention can be used even when it is necessary to fill out both areas above a certain value and below a certain value on a trend graph.

It is also effective to configure a set of frame buffers with a drawing plane and a display plane, and copy the contents from the drawing plane on which the filling process has been completed to the display plane for display.

These filling processing procedures are performed by the drawing processor under the control of the microprocessor, and the program for these steps is not stored in the memory circuit dedicated to the drawing procedure, but is stored inside the microprocessor.
It can also be held in a RAM area, etc.

As described above, the trend graph filling method of the present invention can perform filling operations above and below a certain value without performing any comparison or arithmetic processing.

<Effects of the Invention> As described above, the trend graph filling display method of the present invention fills in advance a closed area surrounded by a trend frame and a boundary line, and when displaying a trend graph, Fill the closed area surrounded by the trend frame and boundary line with the background color of the screen (color when initialized), set the trend frame again, and fill in the area above or below a certain value in the trend graph. Perform a crushing motion.

Therefore, the load on the host computer side can be reduced by simplifying the value comparison processing and arithmetic processing, and the processing does not become complicated even when multiple trend graphs are displayed. It is possible to realize a trend graph filling display method that can quickly display a trend graph that retains the filling function.

[Brief explanation of drawings]

Fig. 1 is a circuit configuration block diagram for realizing the trend graph filling display method of the present invention, and Fig. 2 a, b, c, d, e, f, and g are diagrams showing the actual circuit configuration according to the procedure of the method of the present invention. Figure _3a is a trend graph, and Figure _3b is a constant value y for the display data of the trend graph. _H
The above is a diagram showing the case where the constant value y _L or less is filled in and displayed, Figure 3 c is a diagram representing the storage format of the display data of the trend graph, and Figures 4 a and b are the conventional straight line drawing of the trend graph. FIG. 5 is a diagram illustrating a conventional filling process of a trend graph using a closed area filling function. 1...Host computer, 2...Receiving device, 3...
Microprocessor, 4... Drawing processor, 5
...Drawing switching switch, 6 ₁ , 6 ₂ ... Frame buffer, 7... Display switching switch, 8
...CRT display device, 9...memory circuit.

Claims (1)

[Claims] 1. In a trend graph filling display method that displays a trend graph expressing a data group as a time-series graph and performs a filling operation on a closed area formed by set boundaries, (a) a step of drawing a trend frame with a margin larger than the trend graph display amount and drawing a boundary line for filling; (b) filling and coloring a closed area surrounded by the trend frame and the boundary line; (c) drawing a trend graph; (d) filling a closed area formed by the trend graph, the trend frame, and the boundary line with an initialized color; (e) A trend graph filling display method comprising the step of setting the trend frame to match the trend graph display amount by filling in the margin of the trend frame with an initialized color.