Example #1
0
  private static void solveComponentPositions(BMGraph b) {
    int i = 0;

    if (b.getNodes().size() < 2) {
      for (BMNode n : b.getNodes()) n.put(BMGraphAttributes.POS_KEY, "0.0,0.0");

      return;
    } else if (b.getNodes().size() > 500) {
      Logging.warning(
          "enduser", "Not doing initial layout due to large graph size (over 500 nodes).");
      for (BMNode n : b.getNodes()) {
        n.put(
            BMGraphAttributes.POS_KEY,
            500 * (Math.random() - 0.5) + "," + 500 * (Math.random() - 0.5));
        n.put(BMGraphAttributes.PINNED_KEY, "0");
      }

      return;
    }
    if (b.getNodes().size() == 2) {
      double x = -0.75;
      for (BMNode n : b.getNodes()) {
        n.put(BMGraphAttributes.POS_KEY, x + ",0.0");
        n.put(BMGraphAttributes.PINNED_KEY, "0");
        x += 1.5;
      }
      return;
    }
    Matrix m = LayoutUtils.bmToMatrix(b);

    BMNode[] idToNode = new BMNode[m.cols()];
    for (BMNode node : b.getNodes()) {
      idToNode[i] = node;
      i++;
    }

    int n = m.cols();
    Vec2[] startPositions = new Vec2[n];
    Random random = new Random();
    for (i = 0; i < n; i++) {
      int hash = idToNode[i].getId().hashCode();
      random.setSeed(hash);
      double x = random.nextDouble(), y = random.nextDouble();
      startPositions[i] = new Vec2(x, y);
    }

    StressMinimizer sm = new StressMinimizer(m, startPositions);
    sm.iterate();
    Vec2[] pos = sm.getPositions();

    for (i = 0; i < n; i++) {
      double scale = SCALE;
      Vec2 p = pos[i].scaled(scale);
      idToNode[i].put(BMGraphAttributes.POS_KEY, p.x + "," + p.y);
      idToNode[i].put(BMGraphAttributes.PINNED_KEY, "0");
    }

    scaleGraph(b);
  }
Example #2
0
  /**
   * Uses distance scaling to solve initial layout.
   *
   * @param b
   */
  public static void solvePositions(BMGraph b) {
    if (b.getNodes().size() < 1) {
      Logging.info("layout", "Not doing initial layout on an empty graph.");
      return;
    }
    Logging.info(
        "layout",
        "Solving initial layout positions for a graph of " + b.getNodes().size() + " nodes");

    BMGraph[] components = connectedComponents(b);
    for (int i = 0; i < components.length; i++) {
      solveComponentPositions(components[i]);
    }

    Comparator<BMGraph> graphCmp =
        new Comparator<BMGraph>() {
          public int compare(BMGraph arg0, BMGraph arg1) {
            return graphWidth(arg1) - graphWidth(arg0);
          }
        };
    Arrays.sort(components, graphCmp);

    SquarePacker pack = new SquarePacker(2 * graphWidth(components[0]));
    for (int i = 0; i < components.length; i++) {
      int wh = graphWidth(components[i]);
      Point p = pack.pack(wh);
      // System.out.println("p = "+p);
      for (BMNode cnode : components[i].getNodes()) {
        String[] posstr = cnode.get(BMGraphAttributes.POS_KEY).split(",");
        double x = Double.parseDouble(posstr[0]);
        double y = Double.parseDouble(posstr[1]);
        double whd = wh / 5.0;
        BMNode node = b.getNode(cnode);
        x = (p.x / 5.0 * SCALE + SCALE * whd / 2 + 0.5 * (x * 0.9));
        y = (p.y / 5.0 * SCALE + SCALE * whd / 2 + 0.5 * (y * 0.9));

        node.put(BMGraphAttributes.POS_KEY, x + "," + y);
      }
    }
    Logging.info("layout", "Solved initial layout positions.");
  }