PDF Export on mousePressed?

Hi, I'm new to Processing and programing in general. My apologies if this has been addressed elsewhere, but I couldn't find what I needed in the reference or other forums.  I have a basic program that is structured like this:

2. void setup () {
3.   // set size/background
4. }
5. 
   
6. void draw () {
7.   // draw random shapes
8.   noLoop ();
9. }
10. 
    
11. void mousePressed() {
12.   saveFrame ("rs-###.jpg");
13. }
14. 
    
15. void keyPressed() {
16.   setup();
17.   redraw();
18. }

The idea is that the program draws a set of random shapes.  If I press a key on the keyboard, it resets and draws a new set of random shapes.  If I get something I like, I click the mouse and it saves a JPEG.

What I'd like to do now is get a PDF in place of a JPEG when I click the mouse.  But all I can figure out is this:

2. import processing.pdf.*;
3. 
   
4. void setup () {
5.   // set size/background
6.   beginRecord(PDF, "rs-###.pdf");
7. }
8. 
   
9. void draw () {
10.   // draw random shapes
11.   noLoop ();
12.   endRecord();
13. }
14. 
    
15. void mousePressed() {
16.   saveFrame ("rs-###.jpg");
17. }
18. 
    
19. void keyPressed() {
20.   setup();
21.   redraw();
22. }

which saves a PDF every time the draw function is run.  The problem is that I only want to save a PDF after I see what the draw function does (and would like to trigger the save with mousePressed), but it seems that I need to start recording before the draw function even runs to capture the results.  Any help would be greatly appreciated!

Thanks,

Jeff