这个是自己写的一个几何图形运算的类库，已经开源。欢迎大家 start 或者提issue。
目前项目还在更新中，我会定时同步项目的 README.md 到这篇文章上的。

github: https://github.com/Guojunzhou-git/geometry

geometry

A php composer library of geometry operating

geometry\Point

1. Point Point::__construct(x, y);

• Given x and y, return a Point instance

2. string Point::getUniqueLabel();

• Generate a qunite string identification of Point

3. boolean Point::isInLine(Line line);

• Return whether this point is in the target line

4. boolean Point::isInEdge(Edge edge);

• Return whether this point is in the target edge

5. boolean Point::isSameWithPoint(Point point);

• Return whethis this point has same x and same y with the target point

geometry\Line

1. Line Line::__construct(a, b, c);

• Give the parameters of Line formula Ax+By+C=0, return a Line instance

2. Line Line::fromTwoPoint(Ponit p1, Point p2);

• Return a Line instance by providing two different point

3. boolean Line::isPointOnLine(Point p);

• Retrue whether the target Ponit in this line

4. GeometryException/boolean/Point Line::intersectWithLine(Line line);

• Raise a GeometryException with code=11002 when two lines are the same
• Return a boolean false when two lines are parallel
• Reruen the intersection Point when two line intersects

geometry\Edge

1. Edge Edge::__constrct(Line line, xrange=[0,0], yrange=[0,0]);

• Give a Line and the ranges of x and y, return an instance of Edge

2. Edge Edge::fromTwoEndpoint(Point p1, Point p2);

• Give two points, return the Edge instance with endpoint given

3. boolea Edge::isPointOnEdge(Point p)

• Return whether the given point on this Edge

4. GeometryException/boolean/Point Edge::intersectWithLine(Line line)

• Raise a GeometryException with code=11002 when this edge is a part of line
• Return a boolean false when edge is parallel with line
• Reruen the intersection Point when edge intersects with line in its range

geometry\Polygon

1. Polygon Polygon::fromEndpoints(Point[] points);

• Give the clockwise endpoints of polygon, return an instance of Polygon

2. boolean Polygon::isPointInPolygon(Point p)

• Return whether the target Point in Polygon