Program: 82623
Project: 82623
Buggy source:
public void paint(Graphics2D g,boolean drawBiomes,boolean drawRivers,boolean drawSites,boolean drawCorners,boolean drawDelaunay,boolean drawVoronoi){
  final int numSites=centers.size();
  Color[] defaultColors=null;
  if (!drawBiomes) {
    defaultColors=new Color[numSites];
    for (int i=0; i < defaultColors.length; i++) {
      defaultColors[i]=new Color(r.nextInt(255),r.nextInt(255),r.nextInt(255));
    }
  }
  for (  Center c : centers) {
    g.setColor(drawBiomes ? getColor(c.biome) : defaultColors[c.index]);
    Corner edgeCorner1=null;
    Corner edgeCorner2=null;
    c.area=0;
    for (    Center n : c.neighbors) {
      Edge e=edgeWithCenters(c,n);
      if (e.v0 == null) {
        continue;
      }
      Corner cornerWithOneAdjacent=e.v0.border ? e.v0 : e.v1;
      if (cornerWithOneAdjacent.border) {
        if (edgeCorner1 == null) {
          edgeCorner1=cornerWithOneAdjacent;
        }
 else {
          edgeCorner2=cornerWithOneAdjacent;
        }
      }
      drawTriangle(g,e.v0,e.v1,c);
      c.area+=Math.abs(c.loc.getX() * (e.v0.loc.getY() - e.v1.loc.getY()) + e.v0.loc.getX() * (e.v1.loc.getY() - c.loc.getY()) + e.v1.loc.getX() * (c.loc.getY() - e.v0.loc.getY())) / 2;
    }
    if (edgeCorner2 != null) {
      if (closeEnough(edgeCorner1.loc.getX(),edgeCorner2.loc.getX(),1)) {
        drawTriangle(g,edgeCorner1,edgeCorner2,c);
      }
 else {
        int[] x=new int[4];
        int[] y=new int[4];
        x[0]=(int)c.loc.getX();
        y[0]=(int)c.loc.getY();
        x[1]=(int)edgeCorner1.loc.getX();
        y[1]=(int)edgeCorner1.loc.getY();
        x[2]=(int)((closeEnough(edgeCorner1.loc.getX(),bounds.minX(),1) || closeEnough(edgeCorner2.loc.getX(),bounds.minX(),.5)) ? bounds.minX() : bounds.maxX());
        y[2]=(int)((closeEnough(edgeCorner1.loc.getY(),bounds.minY(),1) || closeEnough(edgeCorner2.loc.getY(),bounds.minY(),.5)) ? bounds.minY() : bounds.maxY());
        x[3]=(int)edgeCorner2.loc.getX();
        y[3]=(int)edgeCorner2.loc.getY();
        g.fillPolygon(x,y,4);
        c.area+=0;
      }
    }
  }
  for (  Edge e : edges) {
    if (drawDelaunay) {
      g.setStroke(new BasicStroke(1));
      g.setColor(Color.YELLOW);
      g.drawLine((int)e.d0.loc.getX(),(int)e.d0.loc.getY(),(int)e.d1.loc.getX(),(int)e.d1.loc.getY());
    }
    if (drawRivers && e.river > 0) {
      g.setStroke(new BasicStroke(1 + (int)Math.sqrt(e.river * 2)));
      g.setColor(RIVER);
      g.drawLine((int)e.v0.loc.getX(),(int)e.v0.loc.getY(),(int)e.v1.loc.getX(),(int)e.v1.loc.getY());
    }
  }
  if (drawSites) {
    g.setColor(Color.BLACK);
    for (    Center s : centers) {
      g.fillOval((int)(s.loc.getX() - 2),(int)(s.loc.getY() - 2),4,4);
    }
  }
  if (drawCorners) {
    g.setColor(Color.WHITE);
    for (    Corner c : corners) {
      g.fillOval((int)(c.loc.getX() - 2),(int)(c.loc.getY() - 2),4,4);
    }
  }
  g.setColor(Color.WHITE);
  g.drawRect((int)bounds.minX(),(int)bounds.minY(),(int)bounds.width(),(int)bounds.height());
}

Fixed version (ground truth):
public void paint(Graphics2D g,boolean drawBiomes,boolean drawRivers,boolean drawSites,boolean drawCorners,boolean drawDelaunay,boolean drawVoronoi){
  final int numSites=centers.size();
  Color[] defaultColors=null;
  if (!drawBiomes) {
    defaultColors=new Color[numSites];
    for (int i=0; i < defaultColors.length; i++) {
      defaultColors[i]=new Color(r.nextInt(255),r.nextInt(255),r.nextInt(255));
    }
  }
  for (  Center c : centers) {
    g.setColor(drawBiomes ? getColor(c.biome) : defaultColors[c.index]);
    Corner edgeCorner1=null;
    Corner edgeCorner2=null;
    c.area=0;
    for (    Center n : c.neighbors) {
      Edge e=edgeWithCenters(c,n);
      if (e.v0 == null) {
        continue;
      }
      Corner cornerWithOneAdjacent=e.v0.border ? e.v0 : e.v1;
      if (cornerWithOneAdjacent.border) {
        if (edgeCorner1 == null) {
          edgeCorner1=cornerWithOneAdjacent;
        }
 else {
          edgeCorner2=cornerWithOneAdjacent;
        }
      }
      drawTriangle(g,e.v0,e.v1,c);
      c.area+=Math.abs(c.loc.getX() * (e.v0.loc.getY() - e.v1.loc.getY()) + e.v0.loc.getX() * (e.v1.loc.getY() - c.loc.getY()) + e.v1.loc.getX() * (c.loc.getY() - e.v0.loc.getY())) / 2;
    }
    if (edgeCorner2 != null) {
      if (closeEnough(edgeCorner1.loc.getX(),edgeCorner2.loc.getX(),1)) {
        drawTriangle(g,edgeCorner1,edgeCorner2,c);
      }
 else {
        int[] x=new int[4];
        int[] y=new int[4];
        x[0]=(int)c.loc.getX();
        y[0]=(int)c.loc.getY();
        x[1]=(int)edgeCorner1.loc.getX();
        y[1]=(int)edgeCorner1.loc.getY();
        x[2]=(int)((closeEnough(edgeCorner1.loc.getX(),bounds.minX(),1) || closeEnough(edgeCorner2.loc.getX(),bounds.minX(),.5)) ? bounds.minX() : bounds.maxX());
        y[2]=(int)((closeEnough(edgeCorner1.loc.getY(),bounds.minY(),1) || closeEnough(edgeCorner2.loc.getY(),bounds.minY(),.5)) ? bounds.minY() : bounds.maxY());
        x[3]=(int)edgeCorner2.loc.getX();
        y[3]=(int)edgeCorner2.loc.getY();
        g.fillPolygon(x,y,4);
        c.area+=0;
      }
    }
  }
  for (  Edge e : edges) {
    if (drawDelaunay) {
      g.setStroke(new BasicStroke(1));
      g.setColor(Color.YELLOW);
      g.drawLine((int)e.d0.loc.getX(),(int)e.d0.loc.getY(),(int)e.d1.loc.getX(),(int)e.d1.loc.getY());
    }
    if (drawRivers && e.river > 0) {
      g.setStroke(new BasicStroke(1 + (int)Math.sqrt(e.river * 2)));
      g.setColor(getRiverColor());
      g.drawLine((int)e.v0.loc.getX(),(int)e.v0.loc.getY(),(int)e.v1.loc.getX(),(int)e.v1.loc.getY());
    }
  }
  if (drawSites) {
    g.setColor(Color.BLACK);
    for (    Center s : centers) {
      g.fillOval((int)(s.loc.getX() - 2),(int)(s.loc.getY() - 2),4,4);
    }
  }
  if (drawCorners) {
    g.setColor(Color.WHITE);
    for (    Corner c : corners) {
      g.fillOval((int)(c.loc.getX() - 2),(int)(c.loc.getY() - 2),4,4);
    }
  }
  g.setColor(Color.WHITE);
  g.drawRect((int)bounds.minX(),(int)bounds.minY(),(int)bounds.width(),(int)bounds.height());
}