JP4184737B2 - Oblique line display method, oblique line display program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for easily drawing and displaying a graphic or an image including diagonal lines in a system that cannot display diagonal lines, such as a data broadcast receiver.
[0002]
[Prior art]
The broadcasting system adopted in BS digital broadcasting is MPEG2-systems defined by DVB (Digital Video Broadcasting: a private standardization organization or its standard for the purpose of promoting and standardizing digital broadcasting systems in Europe). Broadcasters, BS digital broadcasting constituting a program in elements (video, audio, data of data broadcast) digitizes and sends multiplexed. These elements are sent to the receiver as a TS (transport stream) which is a stream format that can be received by the receiver by bundling several broadcast channels or programs.
[0003]
Broadcast programs in digital broadcasting are composed of main line video, main line audio, and data broadcast data. Data of data broadcasting is described in BML (Broadcast Markup Language). A plurality of BML files are collected to form data of one data broadcast program.
[0004]
BML is a description language dedicated to data broadcasting applications based on XML (eXtensible Markup Language). BML can describe a processing procedure in a procedure description language called ECMAScript so that a dynamic operation can be expressed on a data broadcast screen. ECMAScript is an object-oriented scripting language. In addition, DOM Level 1 I / F is provided to dynamically manipulate each object in the document. DOM (Document Object Model) is a model of a document structure defined for dynamically manipulating the content structure of an HTML document or an XML document.
[0005]
Therefore, in order to perform dynamic display on the data broadcast screen, the BML file includes instructions for dynamic display described in ECMAScript (hereinafter referred to as “BML script” or simply “script”). It may be included.
[0006]
[Problems to be solved by the invention]
However, the current BML has a problem that it is not possible to draw and display a diagonal line figure due to a limitation in specifications. The present invention has been made in consideration of such problems, and an object of the present invention is to provide a method and a program for easily realizing diagonal line display in a data broadcasting program using a current BML file.
[0008]
[Means for Solving the Problems]
A first invention for solving the problem is to accept a drawing command as graphic data of a line segment having coordinates at both ends of the line segment and interpret the graphic data for a line segment that is not horizontal or vertical to the scanning line. In a display device that does not have a display function, a method for drawing and displaying a radar chart,
From a combination of adjacent two-axis values, a plurality of rectangular bitmap image data arranged in a diagonal manner with diagonal lines in each case drawn between the two axes as diagonal lines are obtained. Keep it associated with the combination of values,
The bitmap image data corresponding to the combination is read out according to the combination of values for each of the two axes of the radar chart, and the desired radar chart is drawn and displayed by displaying the image data overwritten on the background image data. It is a method to do.
[0009]
Here, “placed normally” means “placed in a direction along the scanning line”.
[0011]
A second invention for solving the problem is to accept a drawing command as graphic data of a line segment having coordinates at both ends of the line segment and interpret the graphic data for a line segment that is not horizontal or vertical to the scanning line. In a display device that does not have a display function, a computer program that describes a series of instructions for drawing and displaying a radar chart,
From combinations of values of two axes adjacent, a plurality of rectangular bitmap image data of the slanting line of all cases drawn which is Sei置the respective diagonal between the two axes, the two axes Store it in association with the combination of values,
Depending on the combination of the values of each two axes of the radar chart, provided by reading the bit map image data corresponding to the combination, create the image data to overwrite the background image data, and displays the image data It is a computer program that displays a radar chart for the obtained data.
[0013]
A third invention for solving the problem is a method for displaying a radar chart in a data broadcasting receiver, and when the receiver receives and selects a screen, the computer program according to the second invention is executed on the receiver. This is a method of drawing and displaying a radar chart with a data broadcast receiver by broadcasting data broadcast program data including BML data that operates as
[0014]
DETAILED DESCRIPTION OF THE INVENTION
First, as an embodiment of the method of the present invention, a method for drawing and displaying a radar chart in a display system that cannot display diagonal lines will be described. Here, the fact that diagonal line display is not possible means that the display device accepts a drawing command as graphic data having line coordinates at both ends of a line segment that is not horizontal or vertical with respect to the scanning line. This means that it does not have a function to interpret and display. FIG. 2 is a diagram illustrating an example of a radar chart. FIG. 2 shows an 8-axis radar chart. The radar chart is a graph that visually represents a data string (which can be regarded as an 8-dimensional column vector in the example of FIG. 2) indicating the value of each axis, like a radar display. That is, a closed polygon composed of line segments connecting adjacent points corresponding to the values of each axis extending radially from the center (in FIG. 2, eight axes are octagons). Thus, a multi-dimensional (eight-dimensional in FIG. 2) data string is visually represented. In FIG. 2, the value of each axis is one of four values of 1, 2, 3, and 4.
[0015]
FIG. 1 is a conceptual diagram illustrating the basic idea of the method of the present invention. A and B in FIG. 1 are rectangular image data arranged in a diagonal direction including diagonal lines to be drawn and displayed (bitmap data, hereinafter, this image data will be referred to as “line segment image data”). is there. In a display system that cannot display diagonal lines, graphic commands representing line segments cannot be used. Therefore, instead of drawing diagonal lines as graphics, line segment image data such as A and B is prepared in advance. In this case, the line image data is overwritten on the background image data at an appropriate position and the overwritten image data is synthesized, and this image data is displayed. As a result, oblique lines are drawn and displayed. This method is sufficiently practical when the number of line segment image data to be prepared is limited.
[0016]
3 and 4 are diagrams for explaining the types of line segment image data that must be prepared in order to actually realize the method of the present invention shown in FIG. FIG. 3 is a table displaying all the 4 × 4 = 16 line segment image data necessary for expressing the broken line between the axis 1 and the axis 2. Each row in the table corresponds to an axis 1 value. Each column corresponds to an axis 2 value. Therefore, in order to draw a polygonal line connecting (axis 1 value, axis 2 value) = (x, y), the line segment image 12-xy in the cell of x rows and y columns may be used. 12-xy in each cell is a number for identifying a line segment image. In addition, a circle on one of the vertices of the line segment image in each cell indicates the arrangement position of the line segment image to be matched with the point indicating the value of axis 1. Since A in FIG. 2 is (axis 1, axis 2) = (3, 3), the line segment image data 12-33 in FIG. 3 is placed at an appropriate position. That is, the upper left vertex of the line segment image 12-33 (indicated by a circle in FIG. 3) coincides with the point position of the value 3 of the axis 1, and 12-33 is placed in a straight line. Similarly, FIG. 4 is a table displaying all 4 × 4 = 16 line segment image data necessary for expressing a broken line between the axes 2 and 3. 2B is (Axis 2, Axis 3) = (3, 4), so the upper left vertex of the line segment image data 23-34 in FIG. It is aligned with the position. Actually, as many tables as shown in FIG. 3 are prepared for the number of combinations of two adjacent axes.
[0017]
The basic idea of the present invention has been outlined above. Next, a method of displaying a radar chart in a data broadcast program by applying this method will be described. FIG. 5 is an overall schematic diagram for explaining a method of displaying a radar chart in a data broadcasting program in the data broadcasting mechanism. Reference numeral 20 denotes a digital broadcasting station accompanied by data broadcasting. Reference numeral 29 denotes a broadcast antenna. The broadcast wave broadcast from the broadcast antenna is received by the reception antenna 39 via the relay satellite 6. The digital broadcast receiver 30 interprets the BML data, and a data broadcast program screen is displayed on the TV monitor 33. The digital broadcast receiver 30 has a recording area (hereinafter referred to as “working memory”) for receiving and temporarily storing data of program data of each broadcast station being broadcast at that time, and temporarily storing it. When a data broadcasting screen of a station program is selected, a CPU for reading out a corresponding BML data file from the working memory, interpreting the contents, and performing control for dynamic display is provided.
[0018]
In order to display a radar chart in a data broadcast program, the BML data 11 including a script that operates as a radar chart display means 31 when the CPU of the receiver 30 interprets and displays the BML is displayed on the radar chart. The value 12 (multidimensional vector value) data 12 is included in the data stream of the broadcast program and broadcast. The receiver 30 caches the BML data 11 and the data 12 (multidimensional vector values) to be displayed on the radar chart in the working memory of the receiver 30, and the data broadcast screen is operated by the user's remote control. Is selected, the script included in the BML data 11 is interpreted and executed by the CPU provided in the receiver 30 and activated as the radar chart display means 31.
[0019]
FIG. 6 is a diagram for explaining the operation of the activated radar chart display means 31. The radar chart display means 31 can combine the step of selecting a line segment image and the selected line segment image over the background image to divide the radar chart image into constituent steps. The radar chart display means 31 includes all necessary line segment image data and background image data.
[0020]
FIG. 6 illustrates the operation of a case where a data string (3,3,4,1,3,4,2,3) is given to the 8-axis radar chart of FIG. 2 for drawing. First, in the step of selecting a line segment image, a combination of data for every two adjacent axes is made from a given data string, and line segment image data corresponding to each combination of two adjacent axis values is obtained. select. For example, since the axes 3 and 4 are (axis 3, axis 4) = (4, 1), line segment image data 34-41 corresponding to this combination is extracted. The eight line segment image data 12-33, 23-34, 34-41, 45-13, 56-34, 67-42, 78-23, 81-33 selected in this way are radar chart images. In the composing step, the image is synthesized as radar chart image data by being overwritten at an appropriate position of the background image data.
[0021]
When the value that each axis can take is 4 and an 8-axis radar chart is drawn, the required line segment image data is 4 × 4 × 8 = 128. Since each line segment image data is a small size of about 1 KByte, there is no problem in broadcasting in the BML file to be broadcast. In addition, if the objectivity regarding the axis of the polygonal line figure is taken into consideration, the number of line segment image data can be further reduced.
[0022]
The method of the present invention is not limited to displaying a radar chart. The present invention can also be applied when a line graph is drawn as shown in FIG. In FIG. 7, by overwriting the line segment image data P, Q, and R with the background image data, it is possible to create and display a line graph image data for a given data string in a display system that cannot display diagonal lines. Show. Line segment image data corresponding to all the inclinations of the broken lines that may appear in this graph may be prepared for the width | S | of one scale on the x axis in the graph of FIG.
[0023]
【The invention's effect】
As described above in detail, according to the drawing display method of the diagonal line figure according to the present invention, as line data having coordinates of both ends of the line segment with respect to the line segment that is not horizontal or vertical to the scanning line. Display devices that accept drawing commands and do not have the function of interpreting and displaying this graphic data , especially digital broadcast receivers, can display diagonal lines or radar charts that require drawing diagonal lines. There is a remarkable effect.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an outline of a method of the present invention.
FIG. 2 is a diagram illustrating an example of a radar chart.
FIG. 3 is a diagram illustrating rectangular image data for combinations of values of axes 1 and 2 of a radar chart.
FIG. 4 is a diagram illustrating rectangular image data for a combination of values of axes 2 and 3 of a radar chart.
FIG. 5 is an overall schematic diagram for explaining a method of displaying a radar chart in a data broadcast program.
FIG. 6 is a diagram for explaining the function of radar chart display means 31;
FIG. 7 is a diagram illustrating a case in which the diagonal line display method according to the present invention is applied to the display of a line graph.
[Explanation of symbols]
6 relay satellite 11 BML data including radar chart display means 12 data to be displayed as radar chart 20 broadcast station 29 broadcast antenna 30 receiver 31 radar chart display means 34 remote control 39 receiving antenna 33 TV display monitor

Claims (3)

In a display device that does not have a function of accepting a drawing command as graphic data of a line segment having coordinates at both ends of the line segment and interpreting and displaying the graphic data for a line segment that is not horizontal or vertical to the scanning line A method of drawing and displaying a radar chart,
From combinations of values of two axes adjacent, a plurality of rectangular bitmap image data of the slanting line of all cases drawn which is Sei置the respective diagonal between the two axes, the two axes Keep it associated with the combination of values,
Depending on the combination of the values of each two axes of the radar charts, it reads the bit map image data corresponding to the combinations, by displaying the image data is overwritten on the background image data, drawing displays the desired radar chart how to. In a display device that does not have a function of accepting a drawing command as graphic data of a line segment having coordinates at both ends of the line segment and interpreting and displaying the graphic data for a line segment that is not horizontal or vertical to the scanning line A computer program that describes a series of instructions for drawing and displaying a radar chart,
From combinations of values of two axes adjacent, a plurality of rectangular bitmap image data of the slanting line of all cases drawn which is Sei置the respective diagonal between the two axes, the two axes Store it in association with the combination of values,
Depending on the combination of the values of each two axes of the radar chart, provided by reading the bit map image data corresponding to the combination, create the image data to overwrite the background image data, and displays the image data A computer program that displays a radar chart for recorded data. A method for displaying a radar chart in a data broadcast receiver, wherein the data broadcast program data includes BML data that operates as a computer program according to claim 2 on the receiver when the receiver receives and selects a screen. A method of drawing and displaying a radar chart with a data broadcasting receiver by broadcasting.

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