plhlsrgb: Convert HLS color to RGB

The PLplot Plotting Library: Programmer's Reference Manual
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### `plhlsrgb`: Convert HLS color to RGB

`plhlsrgb` (h, l, s, p_r, p_g, p_b);

Convert HLS color coordinates to RGB

`h` (`PLFLT`, input) Hue, in degrees on the colour cone (0.0-360.0) `l` (`PLFLT`, input) Lightness, expressed as a fraction of the axis of the colour cone (0.0-1.0) `s` (`PLFLT`, input) Saturation, expressed as a fraction of the radius of the colour cone (0.0-1.0) `p_r` (`PLFLT *`, output) Pointer to red intensity (0.0-1.0) of the colour `p_g` (`PLFLT *`, output) Pointer to green intensity (0.0-1.0) of the colour `p_b` (`PLFLT *`, output) Pointer to blue intensity (0.0-1.0) of the colour

Redacted form:

- General: `plhlsrgb(h, l, s, p_r, p_g, p_b)`

- Perl/PDL: Not available? Implemented as plhls?

This function is used in example 2.

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