int width =800;
int height = 600;
int leftBounds = 20;
int topBounds = 20;
int x=400;
int y=300;
int rightBounds = width - leftBounds;
int bottomBounds=height-topBounds;
int baseMax=20;
int randomMax=10;
int maxLines=2000;
int counter=0;

void setup(){
 size (width, height);
 background (100);
 stroke (255);
 smooth();
}

void draw(){
println (rightBounds);
 counter++;
 int maxDist = baseMax *  round(random(randomMax));
 int minDist = 2;
 int newX = x + (direction() * (minDist + round(random(maxDist))));
 int newY = y + (direction() * (minDist + round(random(maxDist))));
 if (newX < leftBounds){ newX = leftBounds;  }
 if (newX > rightBounds){ newX = rightBounds; }
 if (newY < topBounds){ newY = topBounds; }
 if (newY > bottomBounds) { newY = bottomBounds;}
 line (x,y, newX, newY);
 x=newX;
 y=newY;
}

int direction(){
 int dir= random(1) < 0.5 ? 1 : -1;
 return dir;
}