int canvasWidth = 320;
int canvasHeight = 480;
boolean onScreen = false;
int foodX;
int foodY;
int obstacleX;
int obstacleY;
int obstacleHeight;
int obstacleWidth;
int score = 0;

void setup() {
  size(320, 480);
  textSize(32);
}

void draw() {
  if (!onScreen) {
    foodY = int(random(canvasHeight));
    foodX = int(random(canvasWidth));
    obstacleX = int(random(canvasHeight));
    obstacleY = int(random(canvasWidth));
    obstacleHeight = int(random(canvasHeight));
    obstacleWidth = int(random(canvasWidth));
    onScreen = true;
  }

  if (mouseX > obstacleX & mouseX < (obstacleX + obstacleWidth) & mouseY > obstacleY & mouseY < (obstacleY + obstacleHeight)) {
   score--;
   onScreen = false;
  }

  background(204);
  text(("Score: " + str(score)), 10, 30);
  color c = color(255, 0, 0);
  fill(c);
  noStroke();
  rect(obstacleX, obstacleY, obstacleHeight, obstacleWidth);
  color d = color(255, 255, 255);
  fill(d);
  noStroke();
  rect(foodX, foodY, 10, 10);
}

void mouseClicked() {
 if (mouseX > foodX & mouseX < (foodX + 10) & mouseY > foodY & mouseY < (foodY + 10)) {
   score++;
   onScreen = false;
 }
}