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.TH PLSCMAP1LA 3plplot  "January, 2024" "" "PLplot API"
.SH NAME
\fBplscmap1la\fP - Set cmap1 colors and alpha transparency using a piece-wise linear relationship
.SH SYNOPSIS
\fBplscmap1la\fP(\fIitype\fP, \fInpts\fP, \fIintensity\fP, \fIcoord1\fP, \fIcoord2\fP, \fIcoord3\fP, \fIalpha\fP, \fIalt_hue_path\fP)
.SH DESCRIPTION

.P
This is a variant of \fBplscmap1l\fP(3plplot) 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 PLplot documentation) with \fIalpha\fP transparency value (0.0-1.0). It may be called at any time.
.P
Redacted form: \fBplscmap1la(itype, intensity, coord1, coord2, coord3, alpha, alt_hue_path) \fP
.P
This function is used in example 30.
.SH ARGUMENTS
.TP
\fIitype\fP (\fBPLBOOL\fP(3plplot), input)
true: RGB, false: HLS.
.TP
\fInpts\fP (\fBPLINT\fP(3plplot), input)
number of control points.
.TP
\fIintensity\fP (\fBPLFLT_VECTOR\fP(3plplot), input)
A vector containing the cmap1 intensity index (0.0-1.0) in ascending order for each control point.
.TP
\fIcoord1\fP (\fBPLFLT_VECTOR\fP(3plplot), input)
A vector containing the first coordinate (H or R) for each control point.
.TP
\fIcoord2\fP (\fBPLFLT_VECTOR\fP(3plplot), input)
A vector containing the second coordinate (L or G) for each control point.
.TP
\fIcoord3\fP (\fBPLFLT_VECTOR\fP(3plplot), input)
A vector containing the third coordinate (S or B) for each control point.
.TP
\fIalpha\fP (\fBPLFLT_VECTOR\fP(3plplot), input)
A vector containing the alpha transparency value (0.0-1.0) for each control point.
.TP
\fIalt_hue_path\fP (\fBPLBOOL_VECTOR\fP(3plplot), input)
A vector (with \fInpts - 1\fP 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).

.SH AUTHORS
Many developers (who are credited at http://plplot.org/credits.php)
have contributed to PLplot over its long history.
.SH SEE ALSO
PLplot documentation at http://plplot.org/documentation.php.