FlockingArrows.pde

/**
 * Flocking Arrows
 *
 * A generative art application featuring flocking arrows that follow
 * the Boids algorithm (separation, alignment, cohesion).
 *
 * CONTROLS:
 * - Move mouse to interact with arrows (they will avoid the cursor)
 * - Click mouse to attract arrows
 * - Press SPACE to add more arrows
 * - Press 'r' to reset
 * - Press 's' to save screenshot
 */

ArrayList<Arrow> flock;
boolean mouseAttract = false;

void setup() {
  size(1200, 800);
  smooth();

  // Initialize flock
  flock = new ArrayList<Arrow>();
  for (int i = 0; i < 100; i++) {
    flock.add(new Arrow(random(width), random(height)));
  }
}

void draw() {
  // Create trailing effect
  fill(10, 10, 15, 30);
  noStroke();
  rect(0, 0, width, height);

  // Mouse interaction
  PVector mousePos = new PVector(mouseX, mouseY);

  // Update and display all arrows
  for (Arrow arrow : flock) {
    arrow.run(flock);

    // Mouse interaction
    if (mousePressed) {
      // Left click: attract
      if (mouseButton == LEFT) {
        PVector attraction = arrow.seek(mousePos);
        attraction.mult(0.5);
        arrow.applyForce(attraction);
      }
      // Right click: repel
      else if (mouseButton == RIGHT) {
        PVector flee = arrow.flee(mousePos);
        flee.mult(2.0);
        arrow.applyForce(flee);
      }
    } else {
      // Default: arrows avoid cursor when not clicking
      PVector flee = arrow.flee(mousePos);
      flee.mult(1.0);
      arrow.applyForce(flee);
    }
  }

  // Display info
  displayInfo();
}

void displayInfo() {
  fill(255, 200);
  textAlign(LEFT);
  textSize(12);
  text("Arrows: " + flock.size(), 10, 20);
  text("FPS: " + int(frameRate), 10, 35);
  text("Mouse: Avoid | Left Click: Attract | Right Click: Repel", 10, height - 10);
  text("SPACE: Add arrows | R: Reset | S: Save", 10, height - 25);
}

void keyPressed() {
  // Add more arrows
  if (key == ' ') {
    for (int i = 0; i < 10; i++) {
      flock.add(new Arrow(random(width), random(height)));
    }
  }

  // Reset
  if (key == 'r' || key == 'R') {
    flock.clear();
    for (int i = 0; i < 100; i++) {
      flock.add(new Arrow(random(width), random(height)));
    }
  }

  // Save screenshot
  if (key == 's' || key == 'S') {
    saveFrame("flocking-arrows-####.png");
    println("Screenshot saved!");
  }
}

void mousePressed() {
  // Could add more interaction here
}