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Index › Programming Questions & Help › Syntax Questions › color: defining alpha-value with #AABBCC syntax
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color: defining alpha-value with #AABBCC syntax (Read 1766 times)
_020200_
color: defining alpha-value with #AABBCC syntax
Apr 23rd, 2005, 10:45pm  
Is this possible? Can i define an alphavalue to a color-variable using hexadecimal-syntax instead of RGB?

this work:
Code:
color crcol = color(140, 95, 0, 55);


but here?
Code:
color lcol = #FF0066; //alpha??????????
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JohnG
Re: color: defining alpha-value with #AABBCC synta
Reply #1 - Apr 23rd, 2005, 11:07pm  
you almost can, but you need to use the function "unhex", e.g.:
Code:

color hexcolor(String val)
{
  return unhex(val.substring(1,7));
}

void setup()
{
  size(200,200);
  color c=hexcolor("#FF00FF");
  background(c);
}
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fry
Re: color: defining alpha-value with #AABBCC synta
Reply #2 - Apr 23rd, 2005, 11:27pm  
color c = unhex("FFAAFF80");
should do it, where the first two chars are the alpha value.

we debated including #colors with alpha, but decided it was too confusing in the end (does alpha go first or last? it should actually go first, but all our color functions have alpha last...) and since we'd never seen #xxxxxx syntax with alpha, we didn't want to make something up.
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_020200_
Re: color: defining alpha-value with #AABBCC synta
Reply #3 - Apr 23rd, 2005, 11:38pm  
but i just recently figured out that this also works.

Code:
color crcol = 0x44775522;


where the first two chars are the alpha and the next six are the usual #...... code.

this works for me, because i'm very into webcolors and i always have some good colors in mind using #-syntax Wink
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