source: cpp/frams/genetics/f9/oper_f9.cpp @ 177

// This file is a part of the Framsticks GDK.
// Copyright (C) 2002-2014  Maciej Komosinski and Szymon Ulatowski.  See LICENSE.txt for details.
// Refer to http://www.framsticks.com/ for further information.

#include "oper_f9.h"
#include "conv_f9.h"
#include <common/nonstd.h> //randomN, rnd01


#define FIELDSTRUCT GenoOper_f9
static ParamEntry GENOf9param_tab[] =
{
        { "Genetics: f9", 1, 1, },
        { "f9_mut", 0, 0, "Mutation probability", "f 0 1 0.1", FIELD(mut_prob), "How many genes should be mutated during single mutation (1=all genes, 0.1=ten percent)", },
        { 0, },
};
#undef FIELDSTRUCT


GenoOper_f9::GenoOper_f9()
{
        par.setParamTab(GENOf9param_tab);
        par.select(this);
        par.setDefault();
        supported_format = '9';
}

int GenoOper_f9::checkValidity(const char* gene)
{
        if (!gene[0]) return 1; //empty is not valid
        bool ok = true;
        int i;
        for (i = 0; i < strlen(gene); i++) if (!strchr(turtle_commands_f9, gene[i])) { ok = false; break; }
        return ok ? GENOPER_OK : i + 1;
}

///Remove all invalid letters from the genotype
int GenoOper_f9::validate(char *&gene)
{
        SString validated; //new genotype (everything except turtle_commands_f9 is skipped)
        for (int i = 0; i < strlen(gene); i++)
                if (strchr(turtle_commands_f9, gene[i])) validated += gene[i];  //validated contains only turtle_commands_f9
        free(gene);
        gene = strdup(validated); //reallocate
        return GENOPER_OK;
}

///Very simple mutation
int GenoOper_f9::mutate(char *&gene, float &chg, int &method)
{
        method = 0;
        int changes = 0, len = strlen(gene);
        int symbols = strlen(turtle_commands_f9);

        for (int i = 0; i < len; i++)
        {
                if (rnd01 < mut_prob) //normalize prob with the length of the genotype
                {
                        char oldgene = gene[i];
                        gene[i] = turtle_commands_f9[randomN(symbols)];
                        if (gene[i] != oldgene) changes++;
                }
        }

        if (rnd01 < mut_prob) //add or delete a random char
        {
                SString newgeno(gene);
                if (randomN(2) == 0) //add
                {
                        int symbols = strlen(turtle_commands_f9);
                        int p = randomN(len + 1);  //random location
                        //printf("before add: %s\n",(const char*)newgeno);
                        newgeno = newgeno.substr(0, p) + SString(turtle_commands_f9 + randomN(symbols), 1) + newgeno.substr(p);
                        //printf("after add: %s\n",(const char*)newgeno);
                        changes++;
                }
                else if (len > 1) //delete
                {
                        int p = randomN(len);  //random location
                        //printf("before delete: %s\n",(const char*)newgeno);
                        newgeno = newgeno.substr(0, p) + newgeno.substr(p + 1);
                        //printf("after delete: %s\n",(const char*)newgeno);
                        changes++;
                }
                free(gene);
                gene = strdup(newgeno); //reallocate
        }

        chg = (float)changes / len;
        return changes > 0 ? GENOPER_OK : GENOPER_OPFAIL; //no changes => OPFAIL so that GenMan will call mutate again
}

///A simple one-point crossover
int GenoOper_f9::crossOver(char *&g1, char *&g2, float& chg1, float& chg2)
{
        int len1 = strlen(g1), len2 = strlen(g2);
        int p1 = randomN(len1);  //random cut point for first genotype
        int p2 = randomN(len2);  //random cut point for second genotype
        char *child1 = (char*)malloc(p1 + len2 - p2 + 1);
        char *child2 = (char*)malloc(p2 + len1 - p1 + 1);
        strncpy(child1, g1, p1);   strcpy(child1 + p1, g2 + p2);
        strncpy(child2, g2, p2);   strcpy(child2 + p2, g1 + p1);
        free(g1); g1 = child1;
        free(g2); g2 = child2;
        chg1 = (float)p1 / strlen(child1);
        chg2 = (float)p2 / strlen(child2);
        return GENOPER_OK;
}

///Applying some colors and font styles...
unsigned long GenoOper_f9::style(const char *g, int pos)
{
        char ch = g[pos];
        unsigned long style = GENSTYLE_CS(0, GENSTYLE_INVALID); //default, should be changed below
        char *ptr = strchr((char*)turtle_commands_f9, ch);
        if (ptr)
        {
                int pos = ptr - turtle_commands_f9;
                int axis = pos / 2;
                style = GENSTYLE_RGBS(axis == 0 ? 200 : 0, axis == 1 ? 200 : 0, axis == 2 ? 200 : 0, GENSTYLE_NONE);
        }
        return style;
}