Vector line segment contouring method applicable to mobile terminal
A vector line segment, mobile terminal technology, applied in the field of computer vector graphics rendering, can solve problems such as burden and complex filling operation
Inactive Publication Date: 2011-11-16
INST OF ELECTRONICS & INFORMATION ENG IN
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Problems solved by technology
[0006] Stroke can improve the accuracy of graphic description and make the graphic display more beautiful, but at the same time it brings the burden of rendering
It is generally not recommended to use the stroke operation on graphics on mobile terminals, because the stroke operation involves the contour calculation of line segments, curve approximation, and filling, which is actually more complicated than simple filling operations
Method used
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[0074] Figure 5 It is the outline diagram when the vector line segment has only one vertex in step (3).
[0075] Such as Figure 5 As shown, the vector line segment has only one vertex p, its coordinates are (x, y), and the line width is w. When contouring, take the polygon contour point coordinates:
[0076] (x-w / 2, y-w / 2), (x+w / 2, y-w / 2), (x+w / 2, y+w / 2), (x-w / 2, y+w / 2);
[0077] Image 6 It is the outline diagram when the number of vertices of the vector line segment in step (3) is greater than 1.
[0078] Such as Image 6 As shown, if the number of vertices of the vector line segment is n, and n>1, the vertex is p 0 , P 1 …P n-1 , The line width is w, from p 0 Initially, each vertex is calculated in turn with the next vertex in the vertex sequence as follows:
[0079] The coordinates of adjacent vertices are (x a , Y a ), (x b , Y b ),Such as Image 6 As shown in figure (a), if it is satisfied:
[0080] | x a - x b | | y a - y b | > 1...
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The invention discloses a vector line segment contouring method of a mobile terminal. In the method, two adjacent vertexes are overlapped or one coordinate is deleted when the distance between the vertexes is less than 0.5 pixel on a screen, so that the aims of reducing contour information for generating a polygon, reducing possibility of abnormal conditions and reducing rendering load is fulfilled; then judgment is made to determine whether the line width of a vector line segment is less than 1 pixel, end points and connection of the line segment are not processed, and over-large influence is not brought to display for the vector line segment with line width of less than 1 pixel because the display screen of the mobile terminal is small, and meanwhile, the contouring information of the polygon is reduced and the load for processing the mobile terminal is reduced; and meanwhile, for the vector line segment with line width of greater than 1 pixel, the end points are of square type, theconnection of the line segment is of miter type and bevel type, and coordinate points of the polygonal contour after the contouring of the vector line segment are reduced, so that the load for processing the mobile terminal is reduced.
Description
Technical field [0001] The present invention belongs to the technical field of computer vector graphics rendering, and more specifically, relates to a vector line segment contouring method suitable for mobile terminals. Background technique [0002] The rendering step is the most time-consuming process of rich media processing. At present, the implementation of rendering operations on mobile terminals can be divided into three types: pure software implementation, pure hardware acceleration, and hardware and software combination. [0003] The pure software implementation of rendering is completely based on a general-purpose CPU. Typical software implementations are the implementation of the OpenGL ES standard by Rasteroid of Hybrid. The implementation of Hybrid has already been commercialized on Nokia phones. [0004] The pure hardware acceleration of rendering is based on dedicated hardware to obtain the best performance. The research on hardware acceleration of mobile terminal rende...
Claims
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IPC IPC(8): G06T11/00
Inventor 俸志刚姜帆
Owner INST OF ELECTRONICS & INFORMATION ENG IN