Esempio n. 1
0
  public void initSubproblems() { // initVisibility first
    int i;

    i = reflexIter();
    if (i == 0) {
      setAfter(i);
      i = reflexNext(i);
    }
    if (i == 1) {
      subD.setWeight(0, 1, 0);
      setAfter(i);
      i = reflexNext(i);
    }
    while (i < n - 2) {
      setBefore(i);
      setAfter(i);
      i = reflexNext(i);
    }
    if (i == n - 2) {
      setBefore(i);
      subD.setWeight(i, i + 1, 0);
      i = reflexNext(i);
    }
    if (i == n - 1) {
      setBefore(i);
    }
  }
Esempio n. 2
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 /*
  * We have a new solution for subprob a,b with weight w, using i,j. If it is
  * better than previous solutions, we update. We assume that a<b and i < j.
  */
 public void update(int a, int b, int w, int i, int j) {
   // System.out.print("update("+a+","+b+" w:"+w+" "+i+","+j+")");
   int ow = subD.weight(a, b);
   if (w <= ow) {
     PairDeque pair = subD.pairs(a, b);
     if (w < ow) {
       pair.flush();
       subD.setWeight(a, b, w);
     }
     pair.pushNarrow(i, j);
   }
 }
Esempio n. 3
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 public void typeB(int i, int j, int k) {
   /* k reflex, i not. */
   // System.out.print("\nB "+i+","+j+","+k+":");
   if (!visible(j, k)) return;
   int top = j;
   int w = subD.weight(j, k);
   if (j - i > 1) {
     if (!visible(i, j)) return;
     w += subD.weight(i, j) + 1;
   }
   if (k - j > 1) { // check if must use jk, too.
     PairDeque pair = subD.pairs(j, k);
     if (!Point.right(sp.p(i), sp.p(j), sp.p(pair.aF()))) {
       while (pair.more1() && !Point.right(sp.p(i), sp.p(j), sp.p(pair.underaF()))) pair.pop();
       if ((!pair.empty()) && !Point.left(sp.p(i), sp.p(k), sp.p(pair.bF()))) top = pair.bF();
       else w++; // yes, use jk. top=j already
     } else w++; // yes, use jk. top=j already
   }
   update(i, k, w, j, top);
 }
Esempio n. 4
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 public void initVisibility() { // initReflex() first
   // if (animating())
   // animGraphics.setColor(Color.yellow);
   VisPoly vp = new VisPoly(sp);
   for (int i = reflexIter(); i < n; i = reflexNext(i)) {
     vp.build(i);
     while (!vp.empty()) {
       int j = vp.popVisible() % n;
       if (j < i) subD.setWeight(j, i, INFINITY);
       else subD.setWeight(i, j, INFINITY);
       // if (animating())
       // animGraphics.drawLine(sp.p(i).x(), sp.p(i).y(),
       // sp.p(j).x(), sp.p(j).y());
     }
   }
   // if (animating()) {
   // animGraphics.setColor(Color.blue);
   // try { Thread.sleep(DELAY);
   // } catch(InterruptedException e) {
   // }
   // }
 }
Esempio n. 5
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 public void typeA(int i, int j, int k) {
   /* i reflex; use jk */
   // System.out.print("\nA "+i+","+j+","+k+":");
   // assert(reflex(i), "non reflex i in typeA("+i+","+j+","+k+")");
   // assert(k-i > 1, "too small in typeA("+i+","+j+","+k+")");
   if (!visible(i, j)) return;
   int top = j;
   int w = subD.weight(i, j);
   if (k - j > 1) {
     if (!visible(j, k)) return;
     w += subD.weight(j, k) + 1;
   }
   if (j - i > 1) { // check if must use ij, too.
     PairDeque pair = subD.pairs(i, j);
     if (!Point.left(sp.p(k), sp.p(j), sp.p(pair.bB()))) {
       while (pair.more1B() && !Point.left(sp.p(k), sp.p(j), sp.p(pair.underbB()))) pair.popB();
       if ((!pair.emptyB()) && !Point.right(sp.p(k), sp.p(i), sp.p(pair.aB()))) top = pair.aB();
       else w++; // yes, need ij. top = j already
     } else w++; // yes, need ij. top = j already
   }
   update(i, k, w, top, j);
 }
Esempio n. 6
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 public void recoverSolution(int i, int k) {
   int j;
   if (guard-- < 0) {
     // System.out.println("Can't recover" + i + "," + k);
     return;
   }
   if (k - i <= 1) return;
   PairDeque pair = subD.pairs(i, k);
   if (reflex(i)) {
     j = pair.bB();
     recoverSolution(j, k);
     if (j - i > 1) {
       if (pair.aB() != pair.bB()) {
         PairDeque pd = subD.pairs(i, j);
         pd.restore();
         while ((!pd.emptyB()) && pair.aB() != pd.aB()) pd.popB();
         // assert(!pd.emptyB(),
         // "emptied pd "+i+","+j+","+k+" "+pair.toString());
       }
       recoverSolution(i, j);
     }
   } else {
     j = pair.aF();
     recoverSolution(i, j);
     if (k - j > 1) {
       if (pair.aF() != pair.bF()) {
         PairDeque pd = subD.pairs(j, k);
         pd.restore();
         while ((!pd.empty()) && pair.bF() != pd.bF()) pd.pop();
         // assert(!pd.empty(),
         // "emptied pd "+i+","+j+","+k+" "+pair.toString());
       }
       recoverSolution(j, k);
     }
   }
 }
Esempio n. 7
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  private void drawHelper(Graphics g, int i, int k) {
    int j;
    boolean ijreal = true, jkreal = true;
    if (k - i <= 1) return;
    PairDeque pair = subD.pairs(i, k);
    if (reflex(i)) {
      j = pair.bB();
      ijreal = (pair.aB() == pair.bB());
    } else {
      j = pair.aF();
      jkreal = (pair.bF() == pair.aF());
    }

    if (ijreal) {
      drawDiagonal(g, i, j);
    }
    // else if (label) {
    // g.setColor(Color.orange);
    // drawDiagonal(g, label, i, j);
    // g.setColor(Color.blue);
    // }

    if (jkreal) {
      drawDiagonal(g, j, k);
    }
    // else if (label) {
    // g.setColor(Color.orange);
    // drawDiagonal(g, label, j, k);
    // g.setColor(Color.blue);
    // }

    if (guard-- < 0) {
      // System.out.println("Infinite Loop drawing" + i + "," + k);
      return;
    }
    drawHelper(g, i, j);
    drawHelper(g, j, k);
  }
Esempio n. 8
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 public boolean visible(int i, int j) {
   return subD.weight(i, j) < BAD;
 }
Esempio n. 9
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 public void initPairs(int i, int k) {
   subD.init(i, k);
 }
Esempio n. 10
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 private void setBefore(int i) { // i reflex
   // assert(reflex(i), "non reflex i in setAfter("+i+")");
   subD.setWeight(i - 1, i, 0);
   if (visible(i - 2, i)) subD.init(i - 2, i, 0, i - 1, i - 1);
 }
Esempio n. 11
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 private void setAfter(int i) { // i reflex
   // assert(reflex(i), "non reflex i in setAfter("+i+")");
   subD.setWeight(i, i + 1, 0);
   if (visible(i, i + 2)) subD.init(i, i + 2, 0, i + 1, i + 1);
 }