Point in Polygon
Let $(x_1,y_1),(x_2,y_2),\ldots,(x_n,y_n)$, in that order, be the vertices of the closed polygon and $(x_{t1},y_{t1}),\ldots,(x_{tm},y_{tm})$ be $m$ testing points, this application finds the testing point(s) that are in the polygon or on the border of the polygon.