マウスに向かってくる

gistfile1.pde

int length = 1000;

float[] x = new float[length];
float[] y = new float[length];
float[] speedX = new float[length];
float[] speedY = new float[length];
float[] speedRate = new float[length];

void setup(){
  size(1000, 700);
  colorMode(HSB, 100);
  background(99);
  frameRate(30);
  
  for(int i=0; i<length; i++){
    x[i] = random(width);
    y[i] = random(height);
    speedX[i] = speedY[i] = 0;
    speedRate[i] = random(0.001, 0.01);
  }
}

void draw(){
  background(99);
  
  for(int i=0; i<length; i++){
    speedX[i] = (mouseX - x[i]) * speedRate[i];
    speedY[i] = (mouseY - y[i]) * speedRate[i];
    x[i] += speedX[i];
    y[i] += speedY[i];
    
    drawBug(i);
  }
}

void drawBug(int i){
  pushMatrix();
  translate(x[i], y[i]);
  rotate( atan2(mouseY- y[i], mouseX-x[i]) );
  noStroke();
  rectMode(CENTER);
  fill(12, 50, 99);
  rect(0,0, 10, 5);
  fill(20);
  rect(5,0, 5,5);
  popMatrix();
}