Title:           Processing Pen Tool Simple
Author:          BrokenStylus
Pastebin link:   http://pastebin.com/rqfS3XDN
First Edit:      Saturday 14th of September 2013 10:15:26 PM CDT
Last Edit:       Saturday 14th of September 2013 10:15:26 PM CDT

//Processing Draw Tool (black and white)
 
//COPYPASTA BELOW INTO PROCESSING WINDOW AND CLICK THE PLAY BUTTON
 
/*Instructions
Wait a few seconds after hitting the play button
Left click Black Pen
Right click Eraser
*/
 
int paletteBlack = 0;
int paletteWhite = 255;
void setup() {
  size(displayWidth, displayHeight);
  smooth(4);
  background(255);
  ellipseMode(CENTER);
}
 
void draw() {
  if (mousePressed && (mouseButton == LEFT)) {
    stroke(paletteBlack);
    strokeWeight(10);
    fill(paletteBlack);
    line(mouseX, mouseY, pmouseX, pmouseY);
  }
 
  else if (mousePressed && (mouseButton == RIGHT)) {
    stroke(paletteWhite);
    strokeWeight(20);
    fill(paletteWhite);
    line(mouseX, mouseY, pmouseX, pmouseY);
  }
  else {
    noFill();
    noStroke();
  }
}