[ here is the steps to make it ] step1: circumscribed circle of a triangle https://scratch.mit.edu/projects/1047804657/ step2: delaunay triangulation https://scratch.mit.edu/projects/1047975963/ step3: voronoi diagram: https://scratch.mit.edu/projects/1048007425/ reference: https://web.ntnu.edu.tw/~algo/Neighbor.html
