+/**
+ * @brief The type of coordinate system for certain attributes of the points in a gradient.
+ *
+ * This applies to the:
+ * - Start (x1, y1) and End (x2 and y2) points of a line if using a linear gradient.
+ * - Center point (cx, cy) and radius (r) of a circle if using a radial gradient.
+ * @SINCE_1_1.45
+ */