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Population.pde
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Population.pde
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class Population {
int popnum, lifespan;
PVector target;
Rocket[] rockets;
Population(int popnum_, int lifespan_, PVector target_) {
popnum = popnum_;
lifespan = lifespan_;
target = target_;
rockets = new Rocket[popnum];
for (int i = 0; i < popnum; i++) {
rockets[i] = new Rocket(lifespan, target);
}
}
void doYourThang() {
for (int i = 0; i < popnum; i++) {
rockets[i].checkMotion();
if (!rockets[i].crashed && !rockets[i].reached) {
rockets[i].update();
}
rockets[i].show();
}
if (timer < lifespan - 1) timer++;
else {
timer = 0;
population.evolve();
generation++;
}
}
void evolve() {
// Perform natural selection -> select parents and populate the rockets array with new baby rockets:
DNA[] newDNA = new DNA[popnum];
for (int i = 0; i < popnum; i++) {
newDNA[i] = naturalSelection();
}
// Creating a new Generation of rockets:
for (int i = 0; i < popnum; i++) {
rockets[i].reset();
rockets[i].dna = newDNA[i];
}
}
DNA naturalSelection() {
// Calculate the fitness of every rocket, and also compute the highest fitness value:
float maxFitness = 0;
for (int i = 0; i < popnum; i++) {
rockets[i].calcFitness();
if (rockets[i].fitness > maxFitness) {
maxFitness = rockets[i].fitness;
}
}
int indexA = selectParent(maxFitness);
int indexB = selectParent(maxFitness);
while (true) {
if (indexB == indexA) {
indexB = selectParent(maxFitness);
} else {
break;
}
}
DNA parentA = rockets[indexA].dna;
DNA parentB = rockets[indexB].dna;
DNA child = parentA.crossover(parentB);
child.mutate();
return child;
}
int selectParent(float maxFitness) {
boolean picked = false;
int index = 0;
int counter = 0;
while (!picked) {
index = floor(random(rockets.length));
if (random(maxFitness) < rockets[index].fitness) {
picked = true;
}
counter++;
if (counter >= 10000) {
index = 0;
picked = true;
}
}
return index;
}
}