【第六期（中）】太长不看版

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为什么要重复造轮子
直接用库才对嘛

  • 下载Toxi库
  • 复制以下代码
  • 完成 
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    import toxi.geom.*;
    import toxi.physics2d.*;
    import toxi.physics2d.behaviors.*;
    VerletPhysics2D physics;
    AttractionBehavior2D mouseAttractor;
    Vec2D mouse;

    void setup() {
      size(500, 500, FX2D);
      noFill();
      physics = new VerletPhysics2D();
      physics.setDrag(0.30f);
      addParticle();  
      mouse = new Vec2D(mouseX, mouseY);
      mouseAttractor = new AttractionBehavior2D(mouse, 500, 0.2);
      physics.addBehavior(mouseAttractor);
    }
    void draw() {
      background(255);
      mouse.set(mouseX, mouseY);
      physics.particles.get(0).x = mouseX;
      physics.particles.get(0).y = mouseY;  
      if (mousePressed) {
        addParticle();
      }
      physics.update();
      for (VerletParticle2D p : physics.particles) {
        ellipse(p.x, p.y, 20, 20);
      }
    }
    void addParticle() {
      VerletParticle2D p = new VerletParticle2D(Vec2D.randomVector().scale(5).addSelf(mouseX, mouseY));
      physics.addParticle(p);
      physics.addBehavior(new AttractionBehavior2D(p, 20, -1.2f, 0.01f));
    }