import java.applet.*; 
import java.awt.*; 
import java.awt.image.*; 
import java.awt.event.*; 
import java.io.*; 
import java.net.*; 
import java.text.*; 
import java.util.*; 
import java.util.zip.*; 

public class alphalines extends BApplet {
void setup() {
  size(400,400);
  noBackground();
  blendMode(SUBSTRACT);
}

void loop() {
  stroke((int)random(64),(int)random(204),(int)random(255),(int)random(48));
  int x1=mouseX+(int)random(-20,20);
  int y1=mouseY+(int)random(-20,20);
  if (x1<mouseX) {
    line(0,y1,width,y1+(int)random(-20,20));
  } else {
    line(x1,0,x1+(int)random(-20,20),height);
  }
}
}