2 files changed, 84 insertions, 0 deletions
diff --git a/src/jcgp/backend/modules/mutator/Mutator.java b/src/jcgp/backend/modules/mutator/Mutator.java
new file mode 100644
index 0000000..fd7cd27
--- /dev/null
+++ b/src/jcgp/backend/modules/mutator/Mutator.java
@@ -0,0 +1,11 @@
+package jcgp.backend.modules.mutator;
+
+import jcgp.JCGP.Resources;
+import jcgp.backend.modules.Module;
+import jcgp.backend.population.Chromosome;
+
+public interface Mutator extends Module {
+
+	void mutate(Chromosome chromosome, Resources parameters);
+	
+}
diff --git a/src/jcgp/backend/modules/mutator/PointMutator.java b/src/jcgp/backend/modules/mutator/PointMutator.java
new file mode 100644
index 0000000..62d827d
--- /dev/null
+++ b/src/jcgp/backend/modules/mutator/PointMutator.java
@@ -0,0 +1,73 @@
+package jcgp.backend.modules.mutator;
+
+import java.util.HashMap;
+
+import jcgp.backend.function.Function;
+import jcgp.backend.modules.ModuleStatus;
+import jcgp.backend.parameters.DoubleParameter;
+import jcgp.backend.parameters.Parameter;
+import jcgp.backend.population.Chromosome;
+import jcgp.backend.population.MutableElement;
+import jcgp.backend.population.Node;
+import jcgp.backend.population.Output;
+import jcgp.JCGP.Resources;
+
+public class PointMutator implements Mutator {
+	
+	private DoubleParameter mutationRate;
+	private HashMap<String, Parameter> localParameters;
+	
+	private ModuleStatus status = ModuleStatus.READY;
+	
+	public PointMutator() {
+		mutationRate = new DoubleParameter(0.5, "Percent mutation", false, false, false);
+		
+		localParameters = new HashMap<String, Parameter>();
+		localParameters.put("mutRate", mutationRate);
+	}
+
+	@Override
+	public void mutate(Chromosome chromosome, Resources resources) {
+		int mutations = (int) Math.ceil(((mutationRate.get()) * ((((resources.getDouble("nodes")) + (resources.getDouble("outputs")))) / (double) 100)));
+		for (int i = 0; i < mutations; i++) {
+			MutableElement m = chromosome.getRandomMutableElement();
+			
+			if (m instanceof Output) {
+				m.setConnection(0, chromosome.getRandomConnection());
+			} else if (m instanceof Node) {
+				int geneType = resources.getRandomInt(1 + resources.getInt("arity"));
+				if (geneType < 1) {
+					Function f = resources.getRandomFunction();
+					((Node) m).setFunction(f);
+				} else {
+					m.setConnection(resources.getRandomInt(resources.getInt("arity")), chromosome.getRandomConnection(((Node) m).getColumn()));
+				}
+			}
+		}
+	}
+
+	@Override
+	public HashMap<String, Parameter> getLocalParameters() {
+		return localParameters;
+	}
+
+	@Override
+	public String toString() {
+		return "Point mutation";
+	}
+
+	@Override
+	public ModuleStatus getStatus(Resources resources) {
+		if (mutationRate.get() <= 0 || mutationRate.get() > 100) {
+			status = ModuleStatus.ERROR;
+			status.setDetails("Mutation rate must be > 0 and <= 100");
+		} else if ((int) ((mutationRate.get() / 100) * resources.getDouble("nodes")) >  0) {
+			status = ModuleStatus.WARNING;
+			status.setDetails("With mutation rate " + mutationRate.get() + ", no mutations will occur.");
+		} else {
+			status = ModuleStatus.READY;
+			status.setDetails("");
+		}
+		return status;
+	}
+}