Processing saving empty PDF

Processing Coding Questions
1

I’ve run into this problem where my pdf is coming out blank even though there is stuff on the screen.

I think it has to do with how I’m drawing to the canvas using mousePressed.

any ideas?

import processing.pdf.*;
boolean record = false;


void setup() {
  size(500, 500);
  background(255);
}



void draw () {
  if (record) {
    beginRecord(PDF, "frame-####.pdf");
  }


  if (record) {
    endRecord();
    record = false;
  }
  
}


void mousePressed() {
  circle(mouseX, mouseY, 50);
}



void keyPressed() {
  if (key == 's') {
    record = true;
    println("SAVED");
  }
}
1 Like
2

Hi @TimoL,

You need to start the recording before you draw on the screen for the capture to work.

3

hmm

I’ve tried initialising record as true but I still get a blank pdf.

Btw if you run the code and then click a few times to draw circles then press ‘s’ to save a frame the frame is blank.

any hints

4

Even if you set it to true at the top, the first time you enter the draw loop it is set to false.

import processing.pdf.*;

void setup() {
  size(500, 500);
  background(255);
  beginRecord(PDF, "frame-####.pdf");
}

void draw () {
}

void mousePressed() {
  circle(mouseX, mouseY, 50);
}

void keyPressed() {
  if (key == 's') {
    endRecord();
    exit();
  }
}
1 Like
5

Oh I see! thanks you so much :slight_smile: