Press enter to take a picture

picture.pde

import processing.video.*;

Capture camera;
PImage picture = null;

void setup() {
  size(640, 480);

  camera = new Capture(this, 640, 480, 30);
  camera.start();
}

void draw() {
  if(camera.available() == true) {
    camera.read();
  }

  if(picture == null) {
    set(0, 0, camera);
  } else {
    set(0, 0, picture);
  }
}

void keyPressed() {
  if(key == ENTER) {
    if(picture == null) {
      picture = new PImage(640, 480);
      for(int i = 0; i < 640; i++) {
        for(int j = 0; j < 480; j++) {
          picture.pixels[i + j * 640] = camera.pixels[i + j * 640];
        }
      }
    } else {
      picture = null;
    }
  } 
}