int w=5;

int h0=mouseX;
int v0=mouseY;

int h1=mouseX;
int v1=mouseY;



void setup()
{
  size(200, 200);
  background(0);
  stroke(255);
}

void draw()
{
  for (int b=0; b<w; b++)
  {
    line (mouseX+b, mouseY-b, mouseX+b, mouseY-b);
  }
  point(h0, h1);
  point(v0, v1);
}

void mousePressed()
{
  background(0);
}