int numAgents = 15000, agentShape = Agent.POINT;
boolean done = false, pause = false, showGround = true, readFile = true, writeFile=false;
boolean skip = false; // Fixes a bug in processing.  Remove when bug fixed.
boolean showTrampled = false, showinfo = true;
boolean mousepause = false;
int showinforows = 1;
int showlabelmode = 0;
boolean showPeople = false;
String stadiumFile = "stadium.txt";
Writer agentWriter = null;
boolean showHelpPanel = false;
boolean logfile = false;
boolean changeExit = true;
boolean showlinegraph = true;
boolean confusion = true;
boolean fieldEgress = true;
boolean recordimages = false;

int agentheightKeys = 0;

boolean writeAgents = false;
int stopAtStep = 0; // turns on writing if > 0.
boolean showNodeLabels = false;

void keyPressed(){
  if (showHelpPanel) {
    showHelpPanel = false;
    return;  
  }
  boolean newNav = false;
  if(pause) loop();
  if(key>='0' && key<='9') {
    int n = (key - '0');
    if(n==0) n=10;
    numAgents = n*10000;
    setupGraph(newNav);
    return;

  } 
  else {
    switch(key) {
    case '<':
      graph.halfAgentSpeeds();      
      return;
    case '>':
      graph.doubleAgentSpeeds();      
      return;
    case 'b':
      Node n = getClosestNodeToMouse();
      graph.setOffBomb(n, ((readFile) ? 2 : 100)); // REMIND: Move scaling to FileGraph?
      return;
    case 'f':
      readFile = !readFile;
      newNav = true;
      setupGraph(newNav);
      return;
    case 'g':
      showGround = !showGround;
      return;
    case 'e':
    case 'E':
      fieldEgress = !fieldEgress;
      return;
    case 'i':
      showlabelmode = (showlabelmode>=3) ? 0 : showlabelmode+1;
      graph.setLabelState(showlabelmode);      
      return;
    case 'l':
      //LOGGING
      logfile = !logfile;
      return;
    case 'h':
    case 'H':
      nav.reset();
      return;
    case 'p':
      pause = !pause;
      if(pause)
        noLoop();
      else
        loop();
      return;
    case 't':
    case 'T':
      showTrampled = !showTrampled;
      return;
    case 'o':
    case 'O':
      showinfo = !showinfo;
      return;
    case '/':
    case '?':
      showHelpPanel = !showHelpPanel;
      return;
    case '=':
      showlinegraph = !showlinegraph;
      return;
    case 'z':
    case 'Z':
      showPeople = !showPeople;
      return;
    case 'c':
    case 'C':
      confusion = !confusion;
      setupGraph(newNav);
      return;
    case 'r':
      setupGraph(newNav);
      return;
    case 's':
      agentShape = (agentShape+1) % Agent.SHAPES;
      Agents.ask(new SetShape(agentShape));
      return;
    case 'w':
      writeAgents = !writeAgents;
      setupGraph(newNav);
      return;
    case '[':
      showinforows = (showinforows>0)?showinforows-1:0;
      return;
    case ']':
      showinforows = (showinforows<out.getMaxRows())?showinforows+1:showinforows;
      return;      
    case '{':
      //agentheightKeys = (agentheightKeys>0)?agentheightKeys-1:0;
      agentheightKeys = agentheightKeys-1;
      agentheightKeys = (agentheightKeys<1)?1:agentheightKeys;
      return;
    case '}':
      //agentheightKeys = (agentheightKeys<out.getMaxRows())?agentheightKeys+1:agentheightKeys;
      agentheightKeys = agentheightKeys+1;
      return;      
    default:
      println("Key Pressed: <" + key + ">"); 
      return;
    }

  }
}