NewBox creates a box.

NewCircle creates a circle from a radius and a point.

NewLine creates a line.

NewLseg creates a line segment.

NewNullBox creates a box which can be null.

NewNullCircle creates a circle which can be null.

NewNullLine creates a line which can be null.

NewNullLseg creates a line segment which can be null.

NewNullPath creates a path which can be null.

NewNullPoint creates a point which can be null.

NewNullPolygon creates a polygon which can be null.

NewPath creates a path.

NewPoint creates a point.

NewPolygon creates a polygon.

Circle is represented by a center point and radius.

Line represents a infinite line with the linear equation Ax + By + C = 0, where A and B are not both zero.

NullBox allows a box to be null.

NullCircle allows circle to be null.

NullLine allows line to be null.

NullLseg allows line segment to be null.

NullPath allows path to be null.

NullPoint allows point to be null.

NullPolygon allows polygon to be null.

Path is represented by lists of connected points.

Point is the fundamental two-dimensional building block for geometric types.

Box is represented by pairs of points that are opposite corners of the box.

Lseg is a line segment and is represented by pairs of points that are the endpoints of the segment.

Polygon is represented by lists of points (the vertexes of the polygon).