Method and device for drawing geometric figures

Abstract

The invention relates to method and device for drawing geometric figures. The method comprises the following steps of: on the basis of forming a line segment by two triangles, using triangles to represent a preset figure type to be drawn; after recognizing a start point and a finish point clicked by a mouse, calculating to determine each triangle for forming the preset figure type according to the type, line width, start point position coordinates and finish point position coordinates of the preset figure; and drawing each triangle by a triangle drawing function interface in Direct X which has high support for Windows and simple use and supports hardware acceleration. Especially after each geometric figure is represented by triangles by fully making of a display card, a plurality of advantages of the Direct X can be effectively utilized, and therefore the scheme of the invention can effectively enhance the efficiency of drawing two-dimensional figures.

Description

technical field [0001] The invention relates to the technical field of computer graphics, in particular to a method for drawing geometric figures and a device for drawing geometric figures. Background technique [0002] In the current graphics drawing technology, it mainly includes GDI, OpenGL and DirectX. Among them, GDI is a graphics device interface, which is a general Windows system graphics programming interface developed by MS. It has strong functions and covers a wide range. In general programming It will be used, but GDI does not support hardware acceleration, and the utilization rate of the performance of the graphics card is poor, so it becomes very inefficient when drawing a large number of geometric figures with GDI, which cannot satisfy the demonstration effect of multimedia software. When developing multimedia, its display performance will be very poor, especially when drawing a large number of graphics; OpenGL is a set of three-dimensional graphics software pa...

AI Technical Summary

Problems solved by technology

[0002] In the current graphics drawing technology, it mainly includes GDI, OpenGL and DirectX. Among them, GDI is a graphics device interface, which is a general Windows system graphics programming interface developed by MS. It has strong functions and covers a wide range. In general programming It will be used, but GDI does not support hardware acceleration, and the utilization rate of the performance of the graphics card is poor, so it becomes very inefficient when drawing a large number of geometric figures with GDI, which cannot satisfy the demonstration effect of multimedia software. When developing multimedia, its display performance will be very poor, especially when drawing a large number of graphics; OpenGL is a set of three-dimensional graphics software package developed by SGI. The drawing effect is extremely high. Although it is powerful and supports hardware acceleration, it is difficult to maintain due to the complexity of use, and Windows has limited support for it, so the programmability is poor, and it is time-consuming to develop, and Windows supports it only at 1.1. version; and DirectX is a set of 3D graphics software package developed by Microsoft based on the Windows system. Since it is developed by Microsoft, it supports programming under Windows very well. It is simple to develop, easy to use and maintain, and supports The hardware acceleration function, especially the ability to make full use of the function of the graphics card, can get a very high drawing effect (usually 5 to 10 times that of GDI). Therefore, in terms of the advantages and disadvantages of these three drawing development kits, using DirectX to It is the best choice to develop multimedia software, which can get the effect of the simplest use and maintenance and the highest drawing performance

But for DirectX, because it is a 3D graphics software package, it has good support for 3D graphics, but its support for 2D geometric graphics interfaces is very weak, and its support for 2D geometric graphics is limited. The latest version of DirectX10 can only support the function of drawing straight lines and triangles, which makes the efficiency of drawing two-dimensional geometric figures not high and affects the user experience

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