float FRICTION_FORCE=0.8;
vector GRAVITY_VECTOR=new vector(270,1);
lattice rawr;
int nodeAmount=12;
boolean useGravity=false;
float g_tension=0.25;

PFont uifont;

void setup()
{
  useRK=true;
  size(500,500);
  ellipseMode(CENTER);
  rectMode(CORNER);
  rawr=new lattice(nodeAmount);
  uifont=loadFont("KnockoutHTF30JuniorWelterwt-48.vlw");
  smooth();    
}

void draw()
{
  doUI();


  rawr.update();
  rawr.drawLattice();
  if(mousePressed)
  {
    if(rawr.nodes[0]!=null)
    {
      rawr.nodes[0].p=new position(mouseX,mouseY);
      vector mouseVelocity=new vector(new position(pmouseX,pmouseY),new position(mouseX,mouseY));
      mouseVelocity.m*=5;
      rawr.nodes[0].velocity=rawr.nodes[0].velocity.add(mouseVelocity);
    }      
  }  
}
void keyPressed()
{
  if(key=='+')
  {
    if(nodeAmount<100)
    {
      nodeAmount++;
      rawr=new lattice(nodeAmount);
      rawr.tension=g_tension;      
    }
  }
  else
  if(key=='-')
  {
    if(nodeAmount>3)
    {
      nodeAmount--;
      rawr=new lattice(nodeAmount);
      rawr.tension=g_tension;
    }
  }
  else
  if(key=='g')
  {
    if(useGravity==false)
      useGravity=true;
    else
      useGravity=false;
  }
  if(key=='['&&g_tension>0.01)
  {
    g_tension-=0.005;  
    rawr.tension=g_tension;
  }
  if(key==']'&&g_tension<0.7)  
  {  
    g_tension+=0.005;
    rawr.tension=g_tension;    
  }
  if(key=='r')
  {
    if(useRK)
      useRK=false;
    else
      useRK=true;
  }
}