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Method and device for creating thick line

A generation device and thick line technology, applied in road network navigators, drawing from basic elements, etc., can solve problems such as unrealizable, fast drawing speed, unrealized generation methods, etc., to achieve improved efficiency, small amount of calculation, and connection effect Good results

Active Publication Date: 2007-12-26
ZTE CORP
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  • Application Information

AI Technical Summary

Problems solved by technology

However, when a large number of geographic graphics composed of thin and thick lines are frequently drawn in the embedded graphics system, the hardware configuration conditions in the mid-to-high-end graphics system do not exist, so it is impossible to achieve a faster drawing speed
[0005] In order to solve the above problems, it is necessary to design a high-speed generation method of thick straight lines according to the characteristics of the hardware configuration of the embedded system, but this generation method has not yet been realized
Although the research on the basic algorithm of computer graphics has a history of more than 40 years, its development is quite mature, and it is difficult to make innovative results, but the small progress of the basic algorithm will considerably improve the efficiency of the graphics system

Method used

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  • Method and device for creating thick line
  • Method and device for creating thick line
  • Method and device for creating thick line

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Embodiment Construction

[0027] Embodiments of the present invention provide a method and device for generating thick lines, which can quickly generate thick lines with better connection effects, and belong to a part of research on basic graphics generation algorithms for embedded geographic information service equipment.

[0028] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0029] method embodiment

[0030] According to an embodiment of the present invention, a thick line generation method is provided, which uses a "two-point-symmetrical" line generation algorithm to generate the axis of the thick line, does not need to calculate the outline of the thick line, and directly draws it with a scan line equivalent to the line width (the length o...

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Abstract

A method for generating thick line includes generating line width increment table, confirming slope section of thick line through quick displacement comparison according to coordinate value of thick line end point, seeking relevant line width increment in said table according obtained slope section and line width, adding line width with line width increment to obtain scan line length, using current point as center point to scan out a horizontal line, setting scan range to be half of scan line length to make symmetric scan and plotting out line cup.

Description

technical field [0001] The present invention relates to the field of computer graphics, GDI (Graphics Device Interface, graphics device interface) basic graphics generation algorithm, in particular to a thick line generation method and device, which can quickly generate thick lines, especially suitable for such as embedded geographic information systems , Quick drawing of geographical graphics in the navigation system. Background technique [0002] The present invention originates from the "LBS (Location Based Service, location-based service) software platform" project, can combine wireless positioning technology and GIS (Geographic Information System, geographic information system) The graphic display system is used to tell the user the required geographic location graphic information. [0003] When displaying information based on the target geographic location, it is necessary to frequently call the basic graphics generation algorithm for geographic graphics drawing. Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/20G01C21/26
Inventor 党茂昌
Owner ZTE CORP
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