How does the Hue function work ?

ElGrinta

this is my first ever post here. be patient. I'm learning the color functions, but I do not understand how does the function hue() works.

If I have the following sample code:

color c;

voide setup(){ colorMode(HSB,255); c=color(10,255,255); println(hue(c)); //here I would expect 10, instead I have 9.833333 }

void draw (){ ... }

thanks for any help

Lord_of_the_Galaxy

Please format your code - https://forum.processing.org/two/discussion/32/how-to-format-text-and-code-on-the-new-forum/p1

Also, the reason for your problem is probably just a limitation in terms of precision - conversions in colormodes will lead to such problems. Someone else may confirm this.

ElGrinta

Thanks for your kind answer. I will read the formatting rules for the next time.

jeremydouglass

Here is how the hue function works:

public final float hue(int rgb) {
    if (rgb != cacheHsbKey) {
      Color.RGBtoHSB((rgb >> 16) & 0xff, (rgb >> 8) & 0xff,
                     rgb & 0xff, cacheHsbValue);
      cacheHsbKey = rgb;
    }
    return cacheHsbValue[0] * colorModeX;
}

https://github.com/processing/processing/blob/master/core/src/processing/core/PGraphics.java