Represents the "Coords" entry of the type 2 shading dictionary object.

It is a required entry defined as part of the PDF 1.0 specification.

It contains an array which contains doubles, representing PDF numeric objects.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 80, page 186.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 79, page 231.

The Coords array holds four values: the x and y of the starting point and the x and y of the ending point of the color axis, both in shading space. The color transition runs along the line between these two points.