/* Demonstration of Buffon's needle */

int lineLength = 50;
int gridWidth = 50;
int numTries   = 10000;
color lineColor = #000000;
color needleColor = #5555FF;

void setup() {
  background(#FFFFFF);
  stroke(lineColor);
  size(325,325);
  for(int i = gridWidth; i < width; i = i + gridWidth) {
    line(i,0,i,height);
  }
}
int onLine = 0;
int offLine = 0;

void draw() {
  int x = (int)random(width);
  int y = (int)random(height);
  float theta = radians(random(360));
  float opposite = sin(theta) * lineLength;
  float adjacent = sqrt(lineLength*lineLength-opposite*opposite);
  if(((x%gridWidth)+adjacent) > gridWidth) {
    stroke(#FF0000);
    onLine++;
  } else {
    offLine++;
    stroke(150);
  }
  line(x,y,x+adjacent,y+opposite);
  stroke(200);
  fill(#DDDDDD);
  PFont font = loadFont("Andalus-20.vlw");
  textFont(font, 20);
  float ratio = float(onLine)/float(offLine) * 2.0;
  rect(20,20,140,75);
  fill(0);
  text(("Off lines: " + int(offLine) + "\nOn lines: " + int(onLine) + "\nRatio: " + nf(ratio,1,2)), 25, 25, 500,80); 
}