Transparency is relevant, because in order to get transparency right, you need to draw polygons from back to front (from farthest to closest) using painter's algorithms.
透明性是相关的，因为为了得到透明的权利，你需要从后到前画多边形(从最接近的)使用画家算法。
You can easily draw four-sided polygons in Processing with quad.
在Processing内使用quad可以很容易地绘制有四个边的多边形。
Defines polygons and identifies the classes needed to draw them.
定义多边形，并指出绘制这种形状所需使用的类别。
Drawing program, so that draw lines, ellipses, polygons and other geometric elements, the results can be saved and can be read out.
画图程序，让画出直线，椭圆，多边形等几何元素，结果可以保存并可读出。
In both 2D and 3D, when we draw an object we compose it with several smaller shapes called primitives which as 1 or 2 dimensional entities such as points, lines, and polygons.
在二维或三维中，当我们用他们构建了一些斗劲小的图像，比如点线和多边形，这些被称为根蒂根基图元，一个物体的每一个角落构成的元素是一个顶点。
In both 2D and 3D, when we draw an object we compose it with several smaller shapes called primitives which as 1 or 2 dimensional entities such as points, lines, and polygons.
在二维或三维中，当我们用他们构建了一些斗劲小的图像，比如点线和多边形，这些被称为根蒂根基图元，一个物体的每一个角落构成的元素是一个顶点。
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