getRandomColor but avoid dark colors: Help my algorithm

I am trying to get a random color. I have done it using brute force but this method seems overly laborious (though the distribution is pretty even):

- (UIColor *) getRandomColor {
 // GOAL: reject colors that are too dark
 float total = 3;
 float one = arc4random() % 256 / 256.0;
 total -= one;
 float two = arc4random() % 256 / 256.0;
 total -= two;
 f开发者_如何学Pythonloat three = total; // UIColor will chop out-of-range nums

 NSMutableArray *threeFloats = [[[NSMutableArray alloc] initWithObjects:[NSNumber numberWithFloat:one], [NSNumber numberWithFloat:two], [NSNumber numberWithFloat:three], nil] autorelease];

 NSNumber *red, *green, *blue;
 red = [threeFloats objectAtIndex:arc4random() % [threeFloats count]];
 [threeFloats removeObject:red];
 green = [threeFloats objectAtIndex:arc4random() % [threeFloats count]];
 [threeFloats removeObject:green];
 blue = [threeFloats lastObject];

 return [UIColor colorWithRed:[red floatValue] green:[green floatValue] blue:[blue floatValue] alpha:1];
}

How can it be bettered? I want an even distribution of red, green and blue and nothing too dark (otherwise I'd grab three random numbers and be done with it).

+ (UIColor *)colorWithHue:(CGFloat)hue saturation:(CGFloat)saturation brightness:(CGFloat)brightness alpha:(CGFloat)alpha;

CGFloat hue = ( arc4random() % 256 / 256.0 );  //  0.0 to 1.0
CGFloat saturation = ( arc4random() % 128 / 256.0 ) + 0.5;  //  0.5 to 1.0, away from white
CGFloat brightness = ( arc4random() % 128 / 256.0 ) + 0.5;  //  0.5 to 1.0, away from black

If white is ok then do saturation like hue instead of brightness.

I'd probably generate (pseudo-)random numbers for hue, saturation and lightness (or HSB), with the lightness (or brightness) limited to whatever range you find reasonable, then convert that to RGB.

This method might help you quickly generate bright colors randomly:

1 - Pick a random integer between 0-2
2 - If it is 0, set Red to Random(0.75-1.0), Green and Blue to Random(0.0-1.0)
2 - If it is 1, set Green to Random(0.75-1.0), Red and Blue to Random(0.0-1.0)
2 - If it is 2, set Blue to Random(0.75-1.0), Green and Red to Random(0.0-1.0)