JPH09319734A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always display the character information in a proper and easy-to-see way by storing the character information and the graphic information separately from each other and performing the switching between the column-by-column and row-by-row reading ways of the character information in response to the rotation angles for control of the displayed character strings. SOLUTION: The graphic information is stored in a reference state, i.e., at a rotation angle of 0 degree, and a graphic control part 3 performs the conversion of rotation of the graphic information based on the angle that is instructed by a rotation angle instruction part 5 and sends the converted graphic information to a synthesizing circuit 6. In regard to the character information, the coordinate position corresponding to the graphic information of its reference state is stored together with the tilt angles and array direction of character strings, the character spaces, and the information on the type of the character font used for display and on the character codes to be displayed respectively. A character control part 4 performs the conversion of coordinate of the character information in response to the angle instructed by the part 5 together with the change of array direction of character strings, the switching between the column-by column and row-by-row reading fonts and the correction of character spaces. Then the part 4 generates a display screen and sends it to the circuit 6. The circuit 6 synthesizes both processed graphic and character information together and sends these synthesized information to a display device 8 to show them there.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device, and more particularly, to an image display device which displays a character in a legible manner when an image including the character is rotated.

[0002]

2. Description of the Related Art When data in which a figure such as a map or a design drawing and a character for explaining the figure are combined is arbitrarily rotated and displayed, the character is inverted or overturned, which makes it very difficult to read. For example, in the image display device as shown in FIG. 6, the image data read from the graphic information character information storage means 11 is rotated by the graphic character control unit 13 according to the instruction of the rotation angle instruction unit 12 and displayed on the display device 14. It At this time, the character is also rotated like the figure. That is, when FIG. 7A is rotated, the inconvenience as shown in FIG. 7B always occurs.

On the other hand, by providing means for separately storing the data into graphic information and character information, FIG.
In Japanese Patent Publication No. 62-58510, there is proposed an image display device having a function of keeping the character display horizontal as shown in FIG. 8B even when the figure of FIG. 8A is rotated. There is. However, in this method, as shown in FIG. 9B, the character strings may overlap due to the rotation angle, so that the characters may not be readable.

As a method for solving this problem, a plurality of pieces of character display information are prepared according to the rotation angle of the figure, and FIG.
A method for switching and displaying character information according to a rotation angle, as in (a), (b), (c), and (d), is disclosed in Japanese Patent Laid-Open No. HEI 3-.
No. 122694.

[0005]

The above-mentioned conventional image display device has the following problems.

The first problem is that in order to prevent the character strings from overlapping with each other, a plurality of character display information must be prepared in advance according to the rotation angle of the figure. The more complicated the information on the figure and the characters to be displayed, the more difficult it is to set the character display information.

The second problem is that when the inclination angles of the character strings are changed while maintaining the erect character for each character, overlapping of the character strings can be avoided, but FIG. ，
When the inclination angle exceeds a certain angle as in (b) and (c), the character strings are arranged from bottom to top or from right to left, resulting in an unnatural display.

An object of the present invention is to eliminate the need to prepare a plurality of character display information in advance when rotating and displaying data in which a graphic and a character for explaining the graphic are combined and rotated at an arbitrary angle. An object of the present invention is to provide an image display device capable of displaying a natural and easy-to-read image even if data is rotated at any angle.

[0009]

The image display device of the present invention is an image display device for rotating an image containing a character string and a graphic and displaying it as a new image. Then, when changing the reading direction of the character string according to the rotation angle of the image, the characters are rearranged in the reverse order, and the character style is changed between the horizontal reading and the vertical reading in the character string. If a different character exists, the font is replaced with the corresponding font.

Further, the image display device of the present invention relates to an image including a character string and a graphic, character information storage means for storing the character string, graphic information storage means for storing the graphic, and the image at an arbitrary angle. A rotation angle instructing section for rotating, a figure control section for rotating a figure read out from the figure information storing means in accordance with an instruction angle of the rotation angle instructing section to generate a display figure, and a character string read out from the character information storing section. When the character is rotated according to the angle indicated by the rotation angle indicating section and the reading direction of the character string is changed in accordance with the indicated angle, the characters are rearranged in reverse order, and when the character is read horizontally in the character string. When there is a character whose font is different from that in the case of vertical reading, combine the display figure and the display character string with the character control unit that generates the display character string by replacing with the corresponding font. Constructed and a combining circuit which displays superimposed on the same screen Te.

Further, the image display device of the present invention is the image display device according to claim 2, in which a corresponding font is stored in advance in a character string for a character having a different font between horizontal reading and vertical reading. A character font storage unit is provided.

That is, the image display device according to the present invention is
When the graphic information and the text information describing the graphic are rotated at an arbitrary angle and displayed on the same screen in an overlapping manner, the graphic control unit rotates the graphic information according to the rotation angle instructed by the rotation angle instruction unit. . Further, in the character control unit, from the two points of the rotation angle designated by the rotation angle designating unit and the inclination angle of the character string in the reference state stored in advance in the character information storage unit for each character string, The tilt angle with respect to the horizontal direction after adding rotation for each character is calculated, and the result is compared with the tilt angle that becomes a predetermined boundary. For characters that should have different display fonts during vertical reading, determine whether to replace the font for horizontal reading and the font for vertical reading.If these conditions are met, perform each process and then rotate the graphic information. Rotate the combined text information. The synthesizing circuit synthesizes the graphic information and the character information, which have been respectively subjected to the rotation processing, and sends them to the display device for display.

[0013]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, the image display device according to the present invention relates to an image including a character string and a graphic, a character information storage means 2 for storing the character string, a graphic information storage means 1 for storing the graphic, and an arbitrary image for the image. A rotation angle instructing section 5 for rotating the angle, a figure control section 3 for generating a display figure by rotating the figure read out from the figure information storage means in accordance with an angle instructed by the rotation angle instructing section, and read out from the character information storage section. The character string is rotated according to the instruction angle of the rotation angle instruction unit, and when the reading direction of the character string is changed corresponding to the instruction angle, the characters are rearranged in reverse order,
When there is a character in the character string that has different fonts in the case of horizontal reading and in the case of vertical reading, the character control unit 4 that generates a display character string by substituting it for the corresponding font, the display figure, and the A combination circuit 6 for combining display character strings and displaying them on the same screen, and a character font in which a corresponding font is stored in advance in a character string for characters whose fonts are different between horizontal reading and vertical reading. And a storage unit 7. It should be noted that the display device 8 is the synthesizing circuit 7
Displays the combined image.

In the above image display device, the graphic information and the character information are stored separately. The reference state, that is, the state where the rotation angle is 0 degree is stored as the graphic information, and the graphic control unit 3 performs the rotation conversion of the graphic information to the angle instructed by the rotation angle instruction unit 5, and the synthesizing circuit 6
Send to

The character information stores the coordinate position corresponding to the graphic information in the reference state, the inclination angle of the character string, the arrangement direction of the character string, the character interval, the type of character font used at the time of display, and the character code to be displayed. The character control unit 4 performs coordinate conversion (described later) on the character information in correspondence with the angle designated by the rotation angle designating unit 5, and also changes the arrangement direction of the character string and for horizontal reading and vertical reading. After replacing the font for reading and correcting the character spacing (described later), a display screen is generated and sent to the synthesis circuit 6.

The synthesizing circuit 6 synthesizes the graphic information and the character information which have been subjected to the above respective processes, and sends them to the display device 8 for display.

FIG. 2 shows an example in which the character string is displayed in the horizontal direction in the reference state, that is, in the state where the rotation angle of the figure and the character is 0 degree. This is 1 as shown in FIG.
The character string is rotated counterclockwise while keeping the character upright, and the arrangement direction of the character string is reversed when the inclination angle θ exceeds a certain angle as shown in FIG. 3B. In the example of the figure, the angle θ that is the boundary is set to 45 degrees.
It is also possible to set it to another arbitrary angle.

In FIGS. 3 (a) and 3 (b), a character string that has been recognized as horizontal reading until then is recognized as vertical reading by reversing the arrangement direction. Therefore, for characters with different display fonts such as "-" (long sound symbol) for horizontal reading and vertical reading, the fonts for horizontal reading and vertical reading are replaced.

In FIGS. 4A and 4B, there is no change in the arrangement direction of the character string, but since it is recognized again as horizontal reading when the inclination angle θ is 135 degrees, it is recognized as horizontal reading. The font for vertical reading is replaced.

FIGS. 5A and 5B show an example in which the character spacing is adjusted according to the inclination angle of the character string. When the characters are displayed in an oblique direction by rotation, characters may partially overlap with each other at a standard character interval. Therefore, by correcting the character interval, it is possible to make the display easier to see.

[0022]

As described above in detail, the image display device of the present invention separates and stores character information and graphic information, and the character information is read vertically / horizontally according to the rotation angle. Since the display character string is adjusted by switching, the following effects can be obtained.

The first effect is that the character information is always displayed in an easy-to-see and proper manner even if the map or the design drawing is rotated at an arbitrary angle. Especially, it is particularly effective for displaying explanatory texts for long things such as rivers, roads, and railways on maps.

The second effect is that the area for storing the character information is smaller than that of the conventional technique, and the work of presetting the information is easier than the conventional technique. The reason is that it is not necessary to prepare a plurality of character display information in advance according to the rotation angle, and one character information can be displayed corresponding to any rotation angle.

[0025]

[Brief description of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of an image in a reference state.

FIG. 3 is an explanatory diagram showing an example of an image in a rotated state.

FIG. 4 is an explanatory diagram showing another example of an image in a rotated state.

FIG. 5 is an explanatory diagram showing an example of adjusting overlapping of characters.

FIG. 6 is a block diagram showing a conventional example.

FIG. 7 is an explanatory diagram showing a conventional example of a rotated image.

FIG. 8 is an explanatory diagram showing another example of a rotated image.

FIG. 9 is an explanatory diagram showing another example of a rotated image.

FIG. 10 is an explanatory diagram showing another example of a rotated image.

FIG. 11 is an explanatory diagram showing another example of a rotated image.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 graphic information storage means 2 character information storage means 3 graphic control section 4 character control section 5 rotation angle instruction section 6 synthesis circuit 7 character font storage section 8 display device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location G09G 5/40 G09G 5/40

Claims (3)

[Claims] 1. An image display device for rotating an image including a character string and a graphic and displaying it as a new image, in which each character of the character string rotated together with the graphic is erected, and the character is rotated according to the rotation angle of the image. When changing the reading direction of a character string, rearrange each character in reverse order, and if there is a character in the character string that has a different font between horizontal reading and vertical reading, replace it with the corresponding font. An image display device characterized by the above. 2. A character information storage unit for storing the character string with respect to an image including a character string and a graphic, a graphic information storage unit for storing the graphic, and a rotation angle instruction unit for rotating the image by an arbitrary angle. A graphic control unit that rotates a graphic read from the graphic information storage unit in accordance with an instruction angle of the rotation angle instruction unit to generate a display graphic, and a character string read from the character information storage unit to an instruction angle of the rotation angle instruction unit. When changing the reading direction of the character string in accordance with the designated angle, the characters are rearranged in reverse order, and the character style is changed between the horizontal reading and the vertical reading in the character string. When different characters are present, a character control unit that generates a display character string by substituting the font and a combination of the display figure and the display character string and displaying them on the same screen are displayed. An image display device having a composition circuit. 3. The image display device according to claim 2,
An image display device, comprising: a character font storage unit that stores in advance a corresponding font for a character having different fonts in a character string in horizontal reading and in vertical reading.