How UGL draws polygons
This article will explain in detail how UGL draws polygons. Xiaobian thinks it is quite practical, so share it with you for reference. I hope you can gain something after reading this article.
Drawing Polygon in WindML
The main function is uglPolygon(). The parameter pData is used to indicate the coordinates of each vertex. The first and last two points need to be consistent, so the number of numPoints is one more than the actual number of vertices of the polygon. In addition, you need to indicate the foreground color (border) and background color (fill).
and self-intersecting graphs.
What about borderless graphics? Two options: transparent foreground, or 0 line width
If the beginning and end are inconsistent, it indicates a non-closed figure, i.e. a broken line.
Different raster effects, uglRasterModeSet(), can refer to the line drawing operation
If the polygon you want to draw is a rectangle and one of its edges is horizontal, you can use uglRectangle() directly. Not only the parameters are simple, but more importantly: the underlying driver can be implemented with horizontal lines or area fills, coupled with the hardware acceleration function of the graphics card, the rendering speed can be improved hundreds of times.
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