bradzilla84/color-rgb-hsl/hsl-to-rgb

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hsl-to-rgb

@/hsl-to-rgb

Hnumber

Hue, Starting at the Red primary at 0.0, passing through the Green primary at 0.120 and the Blue primary at 0.240 (0 MIN) (1 MAX)

Snumber

Saturation 0(Black) T 1(Full Color)

Lnumber

Lightnes 0(Black) T 1(White)

INITpulse

Bluenumber

Greennumber

Rednumber

To use the node in your project you should have the bradzilla84/color-rgb-hsl library installed. Use the “File → Add Library” menu item in XOD IDE if you don’t have it yet. See Using libraries for more info.

struct State {
};

{{ GENERATED_CODE }}

float H,S,L, Rval,Gval,Bval;

void HSL(float H, float S, float L, float& Rval, float& Gval, float& Bval);
float Hue_2_RGB( float v1, float v2, float vH );

void HSL(float H, float S, float L, float& Rval, float& Gval, float& Bval)
{
  float var_1;
  float var_2;
  float Hu=H+.33;
  float Hd=H-.33;
  if ( S == 0 )                       //HSL from 0 to 1
  {
    Rval = L * 255;                      //RGB results from 0 to 255
    Gval = L * 255;
    Bval = L * 255;
  }
  else
  {
    if ( L < 0.5 ) 
      var_2 = L * ( 1 + S );
    else           
      var_2 = ( L + S ) - ( S * L );

    var_1 = 2 * L - var_2;

    Rval = round(255 * Hue_2_RGB( var_1, var_2, Hu ));
    Gval = round(255 * Hue_2_RGB( var_1, var_2, H ));
    Bval = round(255 * Hue_2_RGB( var_1, var_2, Hd ));
  }

}
float Hue_2_RGB( float v1, float v2, float vH )             //Function Hue_2_RGB
{
  if ( vH < 0 ) 
    vH += 1;
  if ( vH > 1 ) 
    vH -= 1;
  if ( ( 6 * vH ) < 1 ) 
    return ( v1 + ( v2 - v1 ) * 6 * vH );
  if ( ( 2 * vH ) < 1 ) 
    return ( v2 );
  if ( ( 3 * vH ) < 2 ) 
    return ( v1 + ( v2 - v1 ) * (.66-vH) * 6 );
  return ( v1 );
}
void evaluate(Context ctx) {

    if (!isInputDirty<input_INIT>(ctx)){
        return;}

    float Red;
    float Green;
    float Blue;

    HSL(getValue<input_H>(ctx), getValue<input_S>(ctx), getValue<input_L>(ctx), Red, Green, Blue);

    emitValue<output_Red>(ctx, Red);
    emitValue<output_Green>(ctx, Green);
    emitValue<output_Blue>(ctx, Blue);
}

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hsl-to-rgb

bradzilla84/color-rgb-hsl/hsl-to-rgb

C++ implementation