有些有平衡感的图像互为正负形。
For images to have a sense of balance positive and negative space can be used to counter balance each other.
同时指出可以通过判断矢量多边形面积的正负值将多边形的顶点按照顺时针或逆时针方向排序。
At the same time the author points out that the polygon vertexes can be sorted clockwise or anticlockwise by judging the sign of the vector polygon area.
应用推荐