【互动创意编程】点击产生彩色粒子

有点类似烟花的效果
鼠标点击的地方出现彩色的粒子

Particle.pde

public class Particle {
    
    

  // 
  PVector location;
  PVector acceleration;
  PVector velocity;
  float  lifespan = 255;
  float vr = 6f;
  int r,g,b;
  public Particle(PVector l) {
    
    
    location = l;
    acceleration = new PVector(0, random(0.1,0.5));
    velocity  = new PVector(random(-vr, vr), random(-vr, vr));
    r = (int)random(0,255);
    g = (int)random(0,255);
    b = (int)random(0,255);
  }
  
  
  
  public Particle() {
    
    
    location = new PVector(width/2,height/2);
    acceleration = new PVector(0, random(0.1,0.5));
    velocity  = new PVector(random(-5, 5), random(-5, 5));
  }
  
  
  
  


  // draw the particle
  void display() {
    
    
    noStroke();
   
    fill(r, g, 255, lifespan);
    float size = random(5,15);
    ellipse(location.x, location.y, size, size);
  }

  // update the position
  void update() {
    
    
    location.add(velocity);
    velocity.add(acceleration);
    
    // the lifespan is diminishing
  }

  // Check to see if it's dead
  boolean isDead() {
    
    
    if (lifespan < 0f) {
    
    
      return true;
    } else {
    
    
      return false;
    }
  }

  // make the point run
  void run() {
    
    
    display();
    update();

    lifespan-= 10;
  }
}

ParticleTest.pde

// 练习:模拟单个粒子的运动 //<>// //<>// //<>//
import java.util.Iterator;

Iterator<Particle> it;
int total = 100;
ArrayList<Particle> particles = new ArrayList<Particle>();
void setup() {
    
    
    size(800, 800);
}

void draw() {
    
    
    background(0);
    
    it = particles.iterator();
    while(it.hasNext()) {
    
    
        Particle p = it.next();
        p.run();
        if (p.isDead()) {
    
    
            it.remove();
        }
    }
   
}

void mouseClicked() {
    
    
   for (int i = 0; i < total; i++) {
    
    
        PVector location = new PVector(mouseX,mouseY);
        particles.add(new Particle(location));
    }
}