Image processing method and module

Abstract

The embodiment of the invention discloses an image processing method and module. The image processing method and module are used for simply drawing an annulus. The image processing method includes the steps of obtaining the radius R1 of the inner circle of the target annulus and the radius R2 of the outer circle of the target annulus; drawing n isosceles trapezoids according to the target annulus, wherein the intersection angle of the nth isosceles trapezoid is alphan, the alphan is the acute angle formed in the mode that the two sides of the nth isosceles trapezoid extend to be intersected to a point, the lengths of the sides of each isosceles trapezoid are R2-R1, R1-R1*cos(alphan / 2)<=2, R2-R2*cos(alphan / 2)<=2, and an extension line of the upper bottom edge of the nth isosceles trapezoid is intersected with an extension line of the upper bottom edge of the (n-1)th isosceles trapezoid; obtaining the included angle beta between the side, far away from the second isosceles trapezoid, of the first isosceles trapezoid and the side, far away from the (n-1)th isosceles trapezoid, of the nth isosceles trapezoid; judging whether the included angle beta is smaller than 360 degrees or not, if the included angle beta is smaller than 360 degrees, drawing the (n+1)th isosceles trapezoid according to the obtained included angle beta, if the included angle beta is larger than or equal to 360 degrees, stopping drawing the isosceles trapezoid, and displaying all the isosceles trapezoids. According to the image processing method and module, the annulus can be simply drawn.

Description

technical field [0001] The invention relates to the technical field of image display, in particular to an image processing method and an image processing module. Background technique [0002] As a common graphics, rings are widely used in computer display software. For example, in a geographic information system (Geographic Information System, GIS), when an earthquake or other event occurs in a certain location, a circle can be used to describe it, where the inner ring represents the source of the accident and the outer ring is the affected area. However, in some software systems, such as systems based on OpenGL non-fixed pipeline technology, there is generally no interface for directly displaying the ring, so in practical applications, developers often need to design their own algorithms for drawing the ring. [0003] At present, the general display method is to replace the vector ring with a circular bitmap with transparency. This method is relatively simple, but the disa...

AI Technical Summary

Problems solved by technology

However, in some software systems, such as systems based on OpenGL non-fixed pipeline technology, there is generally no interface for directly displaying the ring, so in practical applications, developers often need to design their own algorithms for drawing rings

[0003] At present, the general display method is to use a circular bitmap with transparency to replace the vector circular ring. This method is relatively simple, but the disadvantage of using the bitmap method is that the image needs to be prepared in advance.

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