ArtifactForms/MeshLibCore

package mesh.selection;

import java.util.HashSet;

import mesh.Face3D;
import mesh.util.TraverseHelper;

public class LoopSelect {

    private FaceSelection selection;

    private HashSet<Face3D> loopSelectedFaces;

    private TraverseHelper helper;

    public LoopSelect(FaceSelection selection) {
        this.selection = selection;
        this.loopSelectedFaces = new HashSet<Face3D>();
        this.helper = new TraverseHelper(selection.getMesh());
    }

    public void select(int index) {
        if (selection.getMesh().faces.isEmpty())
            return;
        Face3D start = selection.getMesh().getFaceAt(index);
        loop(start);
        selection.addAll(loopSelectedFaces);
        loopSelectedFaces.clear();
    }

    private void loop(Face3D face) {
        if (loopSelectedFaces.contains(face))
            return;

        loopSelectedFaces.add(face);

        int from = face.indices[0];
        int to = face.indices[1];
        Face3D pairFace = helper.getFaceByEdge(to, from);
        loop(pairFace);
    }

}