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mayenco
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Hello my name is Mario. I'm a student from Germany, who is new in programming processing.

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Error: A null PFont was passed to textFont()

[11 Replies]
- 19-Jul-2012 10:45 AM
- Forum: Core Library Questions
Hello members.

I'm new in Processing and with Tutorials, Onlinesketches etc. I've created a sketch which shows rss feed lines, if you clap your hands or do a loud sound. Since I've pasted the code of a drop down menu in it, I get the error: A null PFont was passed to textFont().

The code includes two Fonts "Arial-BoldMT-22.vlw" and "ArialMT-22.vlw" as well as two png-Pictures "logo" and "logoklein". You can replace them with whatever you want, just to see how my code works.

The Code is splitted in three menus.

Menu #1:
1. /**
  * Clap to load another RSS Feed, click on the news to move them,
  * news fade out after the 20th.
  *
  * (c) 2012 M. Maier
  */
  
  String s = "";
  
  import ddf.minim.*;
  
  Minim minim;
  AudioInput input;
  
  String[] fontList ;
  String[] titles;
  PFont myfont;
  PVector [] positions;
  PFont [] myFonts;
  int [] myFontSize;
  int Anzahl;
  boolean fullList = false;
  int[] BlockgroesseX;
  int[] BlockgroesseY;
  
  PFont fornt, fett;
  
  String [] loadfeeds = {
  "http://www.faz.net/aktuell/?rssview=1",
  "http://rss.bild.de/bild.xml",
  "http://rss.feedsportal.com/795/f/449002/index.rss",
  "http://www.welt.de/?service=Rss"
  };
  
  int p; //descides a feed in Array "loadfeeds"
  
  XMLElement[] titleXMLElements;
  int CurrentTitle = 0;
  
  float klatschen;
  
  PImage Logoklein;
  PImage Logo;
  
  boolean startbildschirm;
  
  void setup() {
  startbildschirm = true;
  size(screen.width, screen.height);
  fontList = PFont.list();
  minim = new Minim (this);
  input = minim.getLineIn (Minim.STEREO, 512);
  background(0);
  //setzt den Hintergrund im Present-Mode auf Schwarz
  frame.setBackground(new java.awt.Color(0, 0, 0));
  Logoklein = loadImage("logoklein.png");
  Logo = loadImage("logo.png");
  setupMainMenu(); // erstelle Drop-Down Menü
  
  fornt = loadFont("ArialMT-22.vlw");
  fett = loadFont("Arial-BoldMT-22.vlw");
  }
  
  //-----------------------------------------------------------------------
  // Main Menu
  //-----------------------------------------------------------------------
  
  void setupMainMenu() {
  SMenu m=new SMenu(this); // create new main menu (at 0,0)
  m.SMSubM("File"); // new submenu
  m.SMSubM("Import");
  m.SMItem("FAZ", new actn() {
      public void a() {
        p = 0;
      }
  }
  );
  
  m.SMItem("BILD", new actn() {
      public void a() {
        p = 1;
      }
  }
  );
  m.SMItem("Süddeutsche", new actn() {
      public void a() {
        p = 2;
      }
  }
  );
  m.SMItem("Weltonline", new actn() {
      public void a() {
        p = 3;
      }
  }
  );
  
  m.SMEnd();
  
  m.SMItem("Close", new actn() {
      public void a() {
        exit();
      }
  }
  ); // overwrite act.a() with own proc
  
  m.SMEnd();
  
  m.SMSubM("Save");
  m.SMItem("png", new actn() {
      public void a() {
        s="png clicked";
      }
  }
  );
  m.SMItem("tiff", new actn() {
      public void a() {
        s="tiff clicked";
      }
  }
  );
  
  m.SMItem("targa", new actn() {
      public void a() {
        s="targa clicked";
      }
  }
  );
  
  m.SMItem("jpeg", new actn() {
      public void a() {
        s="jpeg clicked";
      }
  }
  );
  
  m.SMEnd();
  
  m.SMSubM("Help");
  m.SMItem("About", new actn() {
      public void a() {
        About();
      }
  }
  );
  
  m.SMEnd(); // end all with SMEnd()
  }
  
  void About() {
  fill(50, 200);
  rect(0, 0, width, height);
  fill(24);
  rect(width/2-300, 160, 600, 340);
  image(Logoklein, 620, 210, Logoklein.width, Logoklein.height);
  strokeWeight(1);
  stroke(80);
  fill(255, 100);
  textFont(fornt);
  textSize(12);
  text("M. Maier \n2.Semester \nInteraktive Medien \nProfessor Erich Schöls", width/2-260, 320);
  
  fill(255);
  text("Snapfeed visualisiert Nachrichten durch Interaktion mit dem Mikrofon.", width/2-260, 430);
  
  ellipseMode(CENTER);
  ellipse(width/2+300, 160, 30, 30);
  textFont(fett);
  if (mouseX > width/2+285 && mouseX < width/2+315 && mouseY > 145 && mouseY < 175) {
      fill(120);
  }
  }
  
  void draw() {
  if (startbildschirm == true) {
      smooth();
      fill(0);
      rect(0, 0, width, height);
      smooth();
      imageMode(CENTER);
      image(Logo, width/2, height/2);
      cursor(HAND);
  }
  else {
  
      //-----------------------------------------------------------------------
      // LOAD RSS FEED
      //-----------------------------------------------------------------------
  
      String url = loadfeeds[p];
      println("Loading feed: "+url);
      XMLElement rss = new XMLElement(this, url);
      titleXMLElements = rss.getChildren("channel/item/title");
  
      Anzahl = titleXMLElements.length;
  
      // Arrays für jede Art von Werten
      titles = new String[Anzahl];
      positions =new PVector[Anzahl];
      myFonts =new PFont[Anzahl];
      myFontSize = new int[Anzahl];
      BlockgroesseX = new int[Anzahl];
      BlockgroesseY = new int[Anzahl];
  
      for (int i = 0; i < titleXMLElements.length; i++) {
        String title = titleXMLElements[i].getContent();
        titles[i]=(new String(title));
      }
  
      // ********** MENÜ BEFEHLE ******************** //
      stroke(g.fillColor);
      if (s.length()>30) { // draw arrow
        pushMatrix();
        translate(20, 20);
        rotate(PI/4);
        line(15, 0, 135, 0);
        triangle(0, 0, 15, -3, 15, 3);
        popMatrix();
      }
  
      background(0);
      cursor(ARROW);
      smooth();
      image(Logoklein, width-80, 60);
      klatschen = input.mix.level() * width;
  
      if (klatschen > 100) {
  
        //immer wenn geklatscht wird fülle die werte abhängig vom Zähler CurrentTitle
  
        positions [CurrentTitle] = (new PVector(random(width/2), random(70, height))); // Positionen
        PFont font = createFont(fontList[(int)random(0, fontList.length)], 10);    // Fonts
        myFonts[CurrentTitle] = font;
        myFontSize[CurrentTitle] = (int)random(14, 200);                           // Font Size
  
        CurrentTitle += 1;
  
        // wenn CurrentTitle die Maximalanzahl erreicht hat setze CurrentTitle auf 0
        // ab jetzt werden schon vorhanden Werte in den Listen neu überschrieben
        // alle anderen bleiben in der Liste bis sie überschrieben werden
        if (CurrentTitle >= Anzahl) {
          CurrentTitle = 0;
        }
      }
  
      // solange die Liste noch nicht die maximalanzahl erreicht hat zähle hoch
  
      if (CurrentTitle < Anzahl && fullList == false)
      {
        for (int j = 0; j < CurrentTitle; j++) {
          int TheTextSize = myFontSize[j];
          textFont(myFonts[j], TheTextSize);
          String newString = titles[j];
  
          /*
           String[] m1 = match(titles[j], "Altmaier");
           if (m1 != null) {
           fill(farben[1]);
           }
           else {
           fill(255, 85);
           }
           */
  
          PVector newPosition = positions[j];
          text(newString, newPosition.x, newPosition.y);
  
          // ermittle die Groesse der Textbloecke
          BlockgroesseX [j] = (int)textWidth(newString);
          BlockgroesseY [j] = TheTextSize;
  
          // wenn die Maus über einem der Blöcke ist übergebe ihm den Mauswert als Koordinate
          if (mousePressed) {
            if (mouseX > (newPosition.x) && mouseX < (newPosition.x+BlockgroesseX[j]) && mouseY > (newPosition.y-BlockgroesseY[j]) && mouseY < (newPosition.y) )
            {
              println("über String Nummer " + j);
              newPosition.x -= (pmouseX-mouseX);
              newPosition.y -= (pmouseY-mouseY);
            }
          }
        }
      }
      else // wenn sie die Maximalanzahl erreicht hat zeichne das vorhandene und ändere immer nur das was CurrentTitle entspricht (von 0 bis 20)
      {
        for (int j = 0; j < Anzahl-1; j++) {
          int TheTextSize = myFontSize[j];
          textFont(myFonts[j], TheTextSize);
          String newString = titles[j];
          PVector newPosition = positions[j];
          text(newString, newPosition.x, newPosition.y);
  
          // wenn die Maus über einem der Blöcke ist übergebe ihm den Mauswert als koordinate
          if (mousePressed) {
            if (mouseX > (newPosition.x) && mouseX < (newPosition.x+BlockgroesseX[j]/2) && mouseY > (newPosition.y-BlockgroesseY[j]) && mouseY < (newPosition.y) )
            {
              newPosition.x -= (pmouseX-mouseX);
              newPosition.y -= (pmouseY-mouseY);
            }
          }
        }
      }
  
      if (CurrentTitle == Anzahl-1)
      {
        fullList = true;
      }
  }
  
  /* void keyPressed() {
     if (key=='s') saveFrame("##.png"); //save .png bei keyPressed oder saveFrame("##.tif") oder saveFrame("##.tga")
     }*/
  }
  
  void mousePressed() {
  if (startbildschirm == true) {
      startbildschirm = false;
      fill(255, 255, 255, random(20, 255));
  }
  // deaktiviert ihn, wenn man mit Maus klickt
  }
Menu #2 (has to be named SMenu.java):
1. import java.util.ArrayList;
  import java.awt.Rectangle;
  import java.awt.event.MouseEvent;
  import processing.core.*;
  
  public class SMenu extends ArrayList {
  static PApplet app; static SMenu actm=null; static PFont font; static actn action=null;
  String nam; actn act=null; SMenu m,par; Rectangle r,rm; int vis=-1;
  public SMenu(PApplet ap) {this(ap,"Main",0,0);}
  public SMenu(PApplet ap,int mx, int my) {this(ap,"Popup",mx,my);}
  SMenu(PApplet ap,String s) {this(ap,s,0,0);}
  SMenu(PApplet ap,String s,int mx,int my) {
      par=actm; nam=s;
      if (ap!=null) {
        app=ap; actm=this; font=app.createFont("Arial",12);
        app.registerDraw(this); app.registerMouseEvent(this);
        if (nam.equals("Main")) app.mouseY=-1; //to avoid appearing main menu at startup
        rm=new Rectangle(mx,my,0,0);
      } else {
        app.pushStyle(); app.textFont(font);
        if (par.nam.equals("Main")) {
          r=new Rectangle(par.rm.x+par.rm.width,par.rm.y,textW(s),textH(s));
          rm=new Rectangle(r.x,par.rm.y+textH(s),0,0);
          par.rm.width+=r.width; par.rm.height=textH(s);
        } else {
          r=new Rectangle(par.rm.x,par.rm.y+par.rm.height,textW(s),textH(s));
          rm=new Rectangle(r.x+r.width,r.y,0,0);
          par.rm.height+=textH(s); par.rm.width=app.max(par.rm.width,textW(s));
        }
        app.popStyle();
      }
  }
  public void SMSubM(String s) {
      actm.add(actm=new SMenu(null,s));
  }
  public void SMItem(String s,actn ac) {
      actm.add(m=new SMenu(null,s)); m.act=ac;
  }
  public void SMSep() {
      actm.add(new SMenu(null,null));
  }
  public void SMEnd() {
      actm=actm.par;
      if (actm==null) if (nam.equals("Main")) adjustH(); else adjustV();
  }
  void adjustH(){
      trimToSize();
      for (int i=0; i<size(); i++) {
        m=(SMenu)get(i);
        m.adjustV();
      }
  }
  void adjustV(){
      trimToSize();
      for (int i=0; i<size(); i++) {
        m=(SMenu)get(i);
        m.r.x=m.par.rm.x;
        m.r.width=m.par.rm.width; m.rm.x=m.r.x+m.r.width;
        m.adjustV();
      }
  }
  public void mouseEvent(MouseEvent event){
      if ((vis>=0)&&(event.getID()==MouseEvent.MOUSE_RELEASED)) {
        if (action!=null) {action.a(); action=null;};
        vis=-1;
        if (nam.equals("Popup")) {
          app.unregisterDraw(this); app.unregisterMouseEvent(this);
        }
      }
  }
  public void draw() {
      app.pushStyle(); app.textFont(font);app.fill(0);
      for (int i=0; i<size(); i++) {
        m=(SMenu)get(i);
        if (m.r.contains(app.mouseX,app.mouseY)) {vis=i; m.vis=999;}
      }
      if (vis>=0){
        action=null;
        app.fill(220,229,234);app.stroke(200);app.rect(rm.x,rm.y,rm.width,rm.height);
        for (int i=0; i<size(); i++) {
          m=(SMenu)get(i);
          if (vis==i){app.fill(210,225,230);app.stroke(180);app.rect(m.r.x,m.r.y,m.r.width,m.r.height);}
          if ((m.act!=null)||(m.size()>0)) app.fill(0); else app.fill(120);
          if (m.nam!=null) app.text(m.nam,m.r.x+10,m.r.y+app.textAscent());
          if ((m.par.par!=null)&&(m.size()>0))
            app.triangle(m.r.x+m.r.width-4,m.r.y+m.r.height/2-3,
                         m.r.x+m.r.width-4,m.r.y+m.r.height/2+3,
                         m.r.x+m.r.width-1,m.r.y+m.r.height/2);
          if (vis==i) m.draw();
          if (m.r.contains(app.mouseX,app.mouseY)) action=m.act;
        }
      }
      app.popStyle();
  }
  int textW(String s) {
      if (s==null) return(0); else
      return((int)app.textWidth(s)+20);
  }
  int textH(String s) {
      if (s==null) return(4); else
      return((int)(app.textAscent()+app.textDescent()));
  }
  }
Menu #3 (has to be named actn.java):
1. public abstract class actn {
  public abstract void a();
  }
Can please someone tell me, what creates the error, and maybe fix it, too?

Another problem I have is, when you go in the Dropdown menu to "Help" --> "About", my credit note is shown for only 1 sec. and disappears...

What also would be cool, if the code could be more structured in menus for example. It's hard for me to keep track of the codes.

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