rt_util_hsv_to_rgb()

rt_errorstate rt_util_hsv_to_rgb	(	double	hsv[3],
		double	rgb[3]
	)

Definition at line 561 of file rt_util.c.

                                                 {
        double r = 0;
        double g = 0;
        double b = 0;
        double v = hsv[2];
 
        if (DBL_EQ(hsv[1], 0.))
                r = g = b = v;
        else {
                double i;
                double f;
                double p;
                double q;
                double t;
 
                int a;
 
                i = floor(hsv[0] * 6.);
                f = (hsv[0] * 6.0) - i;
                p = v * (1. - hsv[1]);
                q = v * (1. - hsv[1] * f);
                t = v * (1. - hsv[1] * (1. - f));
 
                a = (int) i;
                switch (a) {
                        case 1:
                                r = q;
                                g = v;
                                b = p;
                                break;
                        case 2:
                                r = p;
                                g = v;
                                b = t;
                                break;
                        case 3:
                                r = p;
                                g = q;
                                b = v;
                                break;
                        case 4:
                                r = t;
                                g = p;
                                b = v;
                                break;
                        case 5:
                                r = v;
                                g = p;
                                b = q;
                                break;
                        case 0:
                        case 6:
                        default:
                                r = v;
                                g = t;
                                b = p;
                                break;
                }
        }
 
        rgb[0] = r;
        rgb[1] = g;
        rgb[2] = b;
 
        return ES_NONE;
}

References DBL_EQ, ES_NONE, and r.

Referenced by test_hsv_to_rgb().

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