ProcessingJoy ——扑面而来的粒子【JAVA】

效果图

代码与注释

main.pde

Particle[] p = new Particle[800];
int diagonal;
 
void setup() {
  
  size(640, 480);
  
  for (int i = 0; i<p.length; i++) {
    p[i] = new Particle();
    p[i].o = random(1, random(1, width/p[i].n));
  }
  
  diagonal = (int)sqrt(width*width + height * height)/2; ///< 对角线长度的一半
  
  background(0);
  noStroke();
  fill(255);
  frameRate(30);
}
 
float rotation = 0;
 
void draw() {
  /// @note 当点击鼠标，则禁用背景清屏
  if (!mousePressed)  {
    background(0);
  }
 
  translate(width/2, height/2);
  rotation -=0.002;
  rotate(rotation); ///< 外层旋转（整体粒子）
 
  for (int i = 0; i<p.length; i++) {
    p[i].draw();
    
    /// @note 如果粒子跑出屏幕范围，则重置该粒子
    if (p[i].drawDist()>diagonal) {
      p[i] = new Particle();
    }
  }
}