| 
	    plgradient
	  ( | n, | 
| x, | |
| y, | |
| angle ); | 
      Draw a linear gradient using cmap1 inside the polygon
      defined by the n(.  Interpretation of the polygon
      is the same as for x[i],
      y[i])plfill.  The polygon coordinates and the gradient
      angle are all expressed in world coordinates.  The angle from the
      xanglexx
n
	  (PLINTNumber of vertices in polygon.
x
	  (PLFLT_VECTORA vector containing the x coordinates of vertices.
y
	  (PLFLT_VECTORA vector containing the y coordinates of vertices.
angle
	  (PLFLTAngle (degrees) of gradient vector from x axis.
      Redacted form: plgradient(x,y,angle)
    
This function is used in examples 25 and 30.