color_rule_get.c

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#include <grass/gis.h>

int G_colors_count(const struct Colors *colors)
{
    int count = 0;
    struct _Color_Rule_ *rule;

    if (colors->fixed.rules) {
        count++;
        rule = colors->fixed.rules;

        while (rule->next) {
            count++;
            rule = rule->next;
        }
    }
    if (colors->modular.rules) {
        count++;
        rule = colors->modular.rules;

        while (rule->next) {
            count++;
            rule = rule->next;
        }
    }
    return count;
}

int G_get_f_color_rule(DCELL * val1, unsigned char *r1, unsigned char *g1,
                       unsigned char *b1, DCELL * val2, unsigned char *r2,
                       unsigned char *g2, unsigned char *b2,
                       const struct Colors *colors, int rule)
{
    int index = -1;
    int found = 0;
    const struct _Color_Rule_ *rl;

    *val1 = *val2 = 0.0;
    *r1 = *g1 = *b1 = *r2 = *g2 = *b2 = 0;

    /* Find the rule */
    if (colors->fixed.rules) {
        rl = colors->fixed.rules;
        index++;
        if (index == rule)
            found = 1;

        while (!found && rl->next) {
            rl = rl->next;
            index++;
            if (index == rule)
                found = 1;
        }
    }
    if (!found && colors->modular.rules) {
        rl = colors->modular.rules;
        index++;
        if (index == rule)
            found = 1;

        while (!found && rl->next) {
            rl = rl->next;
            index++;
            if (index == rule)
                found = 1;
        }
    }

    if (!found)
        return 1;

    /* Set values */
    *val1 = rl->low.value;
    *val2 = rl->high.value;

    *r1 = rl->low.red;
    *g1 = rl->low.grn;
    *b1 = rl->low.blu;

    *r2 = rl->high.red;
    *g2 = rl->high.grn;
    *b2 = rl->high.blu;

    return 0;
}