08160226_week17

float x=200,y=150;

float vx=0,vy=0;

void setup()

{

  size (300,300);

}

void draw()

{

  background(#FFFFFF);

  stroke(#000000);

  line(100,150, x,y);

  

  fill(#000000);

  noStroke();

  ellipse(100,150, 13,13);

  ellipse(x,y, 13,13);

  if( ! mousePressed){

    float dx=x-100, dy=y-150;

    float len=sqrt(dx*dx+dy*dy);

    vx -=dx*(len-100)/len*0.001;

    vy -=dy*(len-100)/len*0.001;

    x += vx;

    y += vy;

  }

}

void mouseDragged()

{

  x = mouseX;  y = mouseY;

}