void setup() {
  size (420,300);
  background(255,84,255);
  smooth();
}

void draw() {
  stroke(abs(mouseX-pmouseX),abs(mouseX-pmouseX-3),abs(mouseY-pmouseX));
  strokeWeight(abs(mouseX-pmouseX));
  line (pmouseX,pmouseY,mouseX,mouseY);
}