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QR-Code with embedded logo
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// Create new configuration that specifies the error correction | |
Map<EncodeHintType, ErrorCorrectionLevel> hints = new HashMap<EncodeHintType, ErrorCorrectionLevel>(); | |
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); | |
QRCodeWriter writer = new QRCodeWriter(); | |
BitMatrix bitMatrix = null; | |
ByteArrayOutputStream baos = new ByteArrayOutputStream(); | |
try { | |
// Create a qr code with the url as content and a size of 250x250 px | |
bitMatrix = writer.encode("http://www.wombatsoftware.de", BarcodeFormat.QR_CODE, 250, 250, hints); | |
MatrixToImageConfig config = new MatrixToImageConfig(MatrixToImageConfig.BLACK, MatrixToImageConfig.WHITE); | |
// Load QR image | |
BufferedImage qrImage = MatrixToImageWriter.toBufferedImage(bitMatrix, config); | |
// Load logo image | |
BufferedImage logoImage = ImageIO.read(request.getSession().getServletContext().getResourceAsStream("/images/logo.png")); | |
// Calculate the delta height and width between QR code and logo | |
int deltaHeight = qrImage.getHeight() - logoImage.getHeight(); | |
int deltaWidth = qrImage.getWidth() - logoImage.getWidth(); | |
// Initialize combined image | |
BufferedImage combined = new BufferedImage(qrImage.getHeight(), qrImage.getWidth(), BufferedImage.TYPE_INT_ARGB); | |
Graphics2D g = (Graphics2D) combined.getGraphics(); | |
// Write QR code to new image at position 0/0 | |
g.drawImage(qrImage, 0, 0, null); | |
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 1f)); | |
// Write logo into combine image at position (deltaWidth / 2) and | |
// (deltaHeight / 2). Background: Left/Right and Top/Bottom must be | |
// the same space for the logo to be centered | |
g.drawImage(logoImage, (int) Math.round(deltaWidth / 2), (int) Math.round(deltaHeight / 2), null); | |
// Write combined image as PNG to OutputStream | |
ImageIO.write(combined, "png", baos); | |
} catch (WriterException e) { | |
LOG.error("WriterException occured", e); | |
} catch (IOException e) { | |
LOG.error("IOException occured", e); | |
} | |
// Do something with the OutputStream |
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