plscmap1la: Set cmap1 colors and alpha transparency using a piece-wise linear relationship

`plscmap1la`: Set cmap1 colors and alpha transparency using a piece-wise linear relationship
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`plscmap1la`: Set cmap1 colors and alpha transparency using a piece-wise linear relationship

`plscmap1la (`	`itype` ,
	`npts` ,
	`intensity` ,
	`coord1` ,
	`coord2` ,
	`coord3` ,
	`alpha` ,
	`alt_hue_path` `)`;

This is a variant of plscmap1l that supports alpha channel transparency. It sets cmap1 colors using a piece-wise linear relationship between cmap1 intensity index (0.0-1.0) and position in HLS or RGB color space (see the section called “Color Map1”) with alpha transparency value (0.0-1.0). It may be called at any time.

itype (PLBOOL, input): true: RGB, false: HLS.
npts (PLINT, input): number of control points.
intensity (PLFLT_VECTOR, input): A vector containing the cmap1 intensity index (0.0-1.0) in ascending order for each control point.
coord1 (PLFLT_VECTOR, input): A vector containing the first coordinate (H or R) for each control point.
coord2 (PLFLT_VECTOR, input): A vector containing the second coordinate (L or G) for each control point.
coord3 (PLFLT_VECTOR, input): A vector containing the third coordinate (S or B) for each control point.
alpha (PLFLT_VECTOR, input): A vector containing the alpha transparency value (0.0-1.0) for each control point.
alt_hue_path (PLBOOL_VECTOR, input): A vector (with npts - 1 elements) containing the alternative interpolation method Boolean value for each control point interval. (alt_hue_path[i] refers to the interpolation interval between the i and i + 1 control points).

Redacted form: plscmap1la(itype, intensity, coord1, coord2, coord3, alpha, alt_hue_path)

This function is used in example 30.

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`plscmap1l`: Set cmap1 colors using a piece-wise linear relationship	Home	`plscmap1n`: Set number of colors in cmap1