10. Export

As described in the previous tutorials Processing provides various methods for saving the created content in different formats, such as pdf, svg or jpg. The final program looks like this:

import ddf.minim.*;                       
import processing.pdf.*;                  // pdf export
import java.util.Calendar;                // java calendar timestamp
Minim minim;                              
AudioPlayer song;                         
AudioMetaData meta;    
int spacing = 16;                       // space between lines in pixels   
int border = spacing*2;                 // top, left, right, bottom border
int amplification = 6;                  // frequency amplification factor
int y = spacing;
float ySteps;                           // number of lines in y direction
float lastx, lasty;

void setup() {
  size(800, 800);   
  //beginRecord(PDF, meta.author() + “ – “ + meta.title()+ “ – “ + timestamp() + “.pdf”);// save pdf with song artist, title and time
  background(255);                       
  textFont(createFont(“Helvetica”, 11));  // set up font
  textAlign(RIGHT);                       // align text to the right
  minim = new Minim(this);               
  song = minim.loadFile(“song.mp3”);    
  meta = song.getMetaData();              // load music meta data
  song.play();
}

void draw() {
  String info = meta.author() + “ – “ + meta.title();  // song artist and title
  float textsize = textWidth(info);                     // get size of text length
  noStroke();
  fill(255);                                            // draw rectangle the size of the text
  rectMode(CORNER);
  rect(width-border-textsize-spacing, height-border, textsize+border+spacing, border);
  fill(0);
  text(info, width-border, height-border/2);           // print song info
  int screenSize = int((width-2*border)*(height-1.5*border)/spacing);  
  int x = int(map(song.position(), 0, song.length(), 0, screenSize));  // current song pos      ySteps = x/(width-2*border);                         // number of lines
  x -= (width-2*border)*ySteps;                        // new x pos in each line
  float freqMix = song.mix.get(int(x));
  float freqLeft = song.left.get(int(x));
  float freqRight = song.right.get(int(x));
  float amplitude = song.mix.level();
float size = freqMix * spacing * amplification;
  float red = map(freqLeft, -1, 1, 200, 222);
  float green = map(freqRight, -1, 1, 10, 199);
  float blue =  map(freqMix, -1, 1, 10, 88); 
  float opacity = map(amplitude, 0.3, 0.5, 80, 100); 
  strokeWeight(amplitude*5);                                       
  if ((x >= width – 2 * border – 5) || (x <= 10) || song.mix.level() == 0) noStroke();
  else stroke(red, green, blue, opacity);                    
  line(x+border, y*ySteps+border-freqLeft*amplification, lastx+border, lasty*ySteps+border+freqLeft*amplification);
  if ((x >= width – 2 * border – 5) || (x <= 10) || song.mix.level() == 0) noStroke();
  else stroke(222, red, blue, opacity); 
  line(x+border, y*ySteps+border+spacing/2-freqRight*amplification, lastx+border, lasty*ySteps+border+spacing/2+freqRight*amplification);
  lastx = x;
  lasty = y;
  if (amplitude > 0.33) {
    noStroke();
    fill(0, 0, random(255), 50);
    pushMatrix();
    translate(x+border, y*ySteps+border+size);
    int circleResolution = (int)map(amplitude, 0.33, 0.5, 3, 5);
    float radius = size/2;
    float angle = TWO_PI/circleResolution;
    beginShape();
    for (int i=0; i<=circleResolution; i++) {
      float xShape = 0 + cos(angle*i) * radius;
      float yShape = 0 + sin(angle*i) * radius;
      vertex(xShape, yShape);
    }
    endShape();
    popMatrix();
  }
  position();                                        // display song position in console
  if (song.isPlaying() == false) endRecord();        // stop pdf recording
}

void position() {                                    // current song position in minutes and seconds
  int totalSeconds = (int)(song.length()/1000) % 60;
  int totalMinutes = (int)(song.length()/(1000*60)) % 60;
  int playheadSeconds = (int)(song.position()/1000) % 60;
  int playheadMinutes = (int)(song.position()/(1000*60)) % 60;
  String info = playheadMinutes + “:” + nf(playheadSeconds, 2 ) + “/” + totalMinutes + “:” + nf(totalSeconds, 2 );
  println(info);                                          
}

void stop() {
  song.close();
  minim.stop();
  super.stop();
}

void keyReleased() {
  if (key == ‘s’ || key == ‘S’) saveFrame(timestamp()+”_##.png”);    // save png of current frame
  if ((song.isMuted() == false && key == ‘ ‘)) song.mute();          // mute song
  else if ((song.isMuted() == true && key == ‘ ‘)) song.unmute();    // unmute song
}

String timestamp() {
  Calendar now = Calendar.getInstance();
  return String.format(“%1$tH%1$tM%1$tS”, now);
}