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| superclass: object% | 
A linear gradient is used with a brush% to fill
 areas with smooth color transitions.
 Color transitions are based on a line, where colors are assigned to
 stop points along the line, and colors for in-between points are
 interpolated from the stop-point colors. The color of a point on the
 gradient’s line is propagated to all points in the drawing context
 that are touched by a line through the point and perpendicular to the
 gradient’s line.
constructor
(new linear-gradient% [x0 x0] [y0 y0] [x1 x1] [y1 y1] [stops stops]) → (is-a?/c linear-gradient%) x0 : real? y0 : real? x1 : real? y1 : real? stops : (listof (list/c (real-in 0 1) (is-a?/c color%))) 
Creates a linear gradient with a line from (x0, y0)
to end point (x1, y1). The stops list
assigns colors to stop points along the line, where 0.0
corresponds to (x0, y0), 1.0 corresponds to
(x1, y2), and numbers in between correspond to
points in between.
Elements in stops are implicitly sorted by point (i.e., by the number between 0.0 and 1.0). Order is preserved for multiple elements for the same point, in which case the first element for a given point is treated infinitesimally before the point, and additional elements between the first and last for a stop point are effectively ignored.
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Returns the gradient’s control line as x0, y0,
x1, and y1.
Returns the gradient’s list of color stops.
