Marker Tracking

import diewald_bardcode.*;
import diewald_bardcode.CONSTANTS.*;
 
int size = 500;
String content = "http://iad.zhdk.ch";
 
void setup() {
  size(500, 500);
 
  EncodingResult result = Barcode.encode(content, ENCODE.QR_CODE, size,
    size, CHARACTER_SET.DEFAULT, ERROR_CORRECTION.DEFAULT);
    
  if(result.encodingFailed()) {
    println( result.getEncodingException() );
  } else {
    result.setBgColor(255, 255, 255, 255);
    result.setCodeColor(0, 0, 0, 255);
   
    PImage barcode = result.asImage(this);
    if (barcode != null) {
      image(barcode, 0, 0);
      barcode.save("qrcode.jpg");
    }
  }
}
 
void draw() {}

import diewald_bardcode.*;
import diewald_bardcode.CONSTANTS.*;
import processing.video.*;

Capture video;

void setup() {
  size(640, 480);
  video = new Capture(this, 640, 480, 30);
  video.start();
}

void draw() {
  if (video.available()) {
    background(0);
    
    video.read();
    image(video, 0, 0);

    // DecodingResult result = Barcode.decodeMulti(video, CHARACTER_SET.DEFAULT, true, DECODE.values());
    DecodingResult result = Barcode.decode(video, CHARACTER_SET.DEFAULT, true, DECODE.QR_CODE);
    // DecodingResult result = Barcode.decode(video, CHARACTER_SET.DEFAULT, true, DECODE.CODE_128);

    if (!result.decodingFailed()) {
      PVector center = getCenter(result);
      float rotation = getRotation(result);

      pushMatrix();
      translate(center.x, center.y);
      rotate(rotation);
      stroke(0);
      strokeWeight(2);
      ellipse(0, 0, 50, 50);
      line(0, 0, -25, 0);
      popMatrix();

      println(degrees(rotation));
    }
  }
}

PVector getCenter(DecodingResult result) {
  PVector returnVector = new PVector(0, 0);

  for (int i = 0; i < result.getCorners ().length; i++) {
    returnVector.x += result.getCorners()[i].x;
    returnVector.y += result.getCorners()[i].y;
  }

  returnVector.x /= result.getCorners().length;
  returnVector.y /= result.getCorners().length;

  return returnVector;
}

float getRotation(DecodingResult result) {
  PVector p1 = new PVector(result.getCorners()[0].x, result.getCorners()[0].y);
  PVector p2 = new PVector(result.getCorners()[1].x, result.getCorners()[1].y);
  PVector p3 = p2.sub(p1);

  return p3.heading()+PI/2;
}