qr_scanner.pde

import processing.video.*;
import com.google.zxing.*;
import com.google.zxing.common.*;
import com.google.zxing.qrcode.*;

Capture cam; //Set up the camera
Reader reader = new QRCodeReader();
PImage cover;  //This will have the cover image
String lastISBNAcquired = "";  //This is the last ISBN we acquired

int WIDTH = 640;
int HEIGHT = 480;

void setup() {
  size(WIDTH, HEIGHT);
  cam = new Capture(this, WIDTH, HEIGHT);
  cam.start();
}

void draw() {
  if (cam.available()) {
    cam.read();
    image(cam, 0, 0);
    try {
      // Now test to see if it has a QR code embedded in it
      LuminanceSource source = new BufferedImageLuminanceSource((BufferedImage) cam.getNative());
      BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
      Result result = reader.decode(bitmap);
      //Once we get the results, we can do some display
      if (result.getText() != null) {
        println(result.getText());
        ResultPoint[] points = result.getResultPoints();
        //Draw some ellipses on at the control points
        for (int i = 0; i < points.length; i++) {
          fill(#ff8c00);
          ellipse(points[i].getX(), points[i].getY(), 20, 20);
        }
        //Now fetch the book cover, if it is found
        if (!result.getText().equals(lastISBNAcquired)) {
          String url = result.getText();
          try {
            cover = loadImage(url, "gif");
            lastISBNAcquired = result.getText();
          } catch (Exception e) {
            println("Error loading image: " + e.getMessage());
          }
        }
        //Superimpose the cover on the image
        if (cover != null) {
          image(cover, points[1].getX(), points[1].getY());
        }
      }
    } catch (NotFoundException e) {
      //QR code not found, do nothing
    } catch (Exception e) {
      println("Error decoding QR code: " + e.getMessage());
    }
  }
}