// Example 05-07 from "Getting Started with Processing" 
// by Reas & Fry. O'Reilly / Make 2010

void setup() {
  size(480, 120);
  smooth();
  stroke(0, 102);
}

void draw() {
  float weight = dist(mouseX, mouseY, pmouseX, pmouseY);
  strokeWeight(weight);
  line(mouseX, mouseY, pmouseX, pmouseY);
}