float x=random(0,100);
float y=random(0,100);
float vx = random(1,3);
float vy = random(1,3);

void setup() {
  size(100,100);
  frameRate(25);
}

void draw() {
  vx = (mouseX - x) / 30;
  vy = (mouseY - y) / 30;

  background(255);
  fill(0,0,255);
  
  float angle = atan2(mouseY-y, mouseX-x);
  translate(x,y);
  rotate(angle);
  triangle( -10,5, 10, 0, -10, -5);
  
  x=x+vx;
  y=y+vy;
}