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POJava Image Cropping Not Accurate
 

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  1. POJava Image Cropping Not Accurate
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    <p>Heres my code, when you select and area you want to crop and then push enter, the cropped image isn't the same size/picture as the original selected area.</p> <pre><code>public class DragNDrop extends JFrame implements DropTargetListener { private static final long serialVersionUID = 1872019741456690593L; private Graphics g; private BufferedImage image, origiImage; private Rectangle area; private Rectangle currentRect; private Rectangle rectToDraw = null; private Image buffer; public static void main(String args[]) { new DragNDrop(); } public DragNDrop() { super("Drop Test"); setSize(300, 300); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setDropTarget(new DropTarget(getContentPane(), this)); setVisible(true); CaptureListener listener = new CaptureListener(); addMouseListener(listener); addMouseMotionListener(listener); } public void drop(DropTargetDropEvent dtde) { try { Transferable tr = dtde.getTransferable(); DataFlavor[] flavors = tr.getTransferDataFlavors(); dtde.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE); Object list = tr.getTransferData(flavors[0]); list = list.toString().substring(1, list.toString().length()-1); if (isValidImage(list)) { Image droppedImage = Toolkit.getDefaultToolkit().getImage(list.toString()); image = toBufferedImage(droppedImage); origiImage = toBufferedImage(droppedImage); area = new Rectangle(image.getWidth(), image.getHeight()); if (droppedImage != null) { setSize(image.getWidth(), image.getHeight()); dtde.dropComplete(true); addKeyListener(new KeyListener() { @Override public void keyTyped(KeyEvent e) { } @Override public void keyReleased(KeyEvent e) { if (e.getKeyCode() == 10) { capture(); } } @Override public void keyPressed(KeyEvent e) { } }); return; } } dtde.rejectDrop(); } catch (Exception e) { dtde.rejectDrop(); } } public void paint() { if (area != null &amp;&amp; image != null) { g.clearRect(area.x, area.y, area.width, area.height); g.drawImage(image, 0, 0, null); } if (currentRect != null) { g.setColor(Color.RED); g.drawRect(rectToDraw.x, rectToDraw.y, rectToDraw.width, rectToDraw.height); g.setColor(new Color(255,255,255,150)); g.fillRect(rectToDraw.x, rectToDraw.y, rectToDraw.width, rectToDraw.height); } } @Override public void paint(Graphics gr) { if (buffer == null &amp;&amp; area != null) { this.buffer = createImage(area.width, area.height); this.g = buffer.getGraphics(); } paint(); if (buffer != null) gr.drawImage(buffer, 0, 0, this); } public boolean isValidImage(Object list) { System.out.println(list.toString()); for (String string : ImageIO.getReaderFormatNames()) if (list.toString().contains(string)) return true; return false; } public BufferedImage toBufferedImage(Image image) { if (image instanceof BufferedImage) { return (BufferedImage) image; } image = new ImageIcon(image).getImage(); boolean hasAlpha = hasAlpha(image); BufferedImage bimage = null; GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment(); int transparency = Transparency.OPAQUE; if (hasAlpha == true) { transparency = Transparency.BITMASK; } GraphicsDevice gs = ge.getDefaultScreenDevice(); GraphicsConfiguration gc = gs.getDefaultConfiguration(); bimage = gc.createCompatibleImage(image.getWidth(null), image.getHeight(null), transparency); if (bimage == null) { int type = BufferedImage.TYPE_INT_RGB; if (hasAlpha == true) { type = BufferedImage.TYPE_INT_ARGB; } bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), type); } Graphics g = bimage.createGraphics(); g.drawImage(image, 0, 0, null); g.dispose(); return bimage; } public static boolean hasAlpha(Image image) { if (image instanceof BufferedImage) { return ((BufferedImage) image).getColorModel().hasAlpha(); } PixelGrabber pg = new PixelGrabber(image, 0, 0, 1, 1, false); try { pg.grabPixels(); } catch (InterruptedException e) { } return pg.getColorModel().hasAlpha(); } private void updateRectangle(int compWidth, int compHeight) { int x = currentRect.x; int y = currentRect.y; int width = currentRect.width; int height = currentRect.height; if (width &lt; 0) { width = 0 - width; x = x - width + 1; if (x &lt; 0) { width += x; x = 0; } } if (height &lt; 0) { height = 0 - height; y = y - height + 1; if (y &lt; 0) { height += y; y = 0; } } if ((x + width) &gt; compWidth) { width = compWidth - x; } if ((y + height) &gt; compHeight) { height = compHeight - y; } if (rectToDraw != null) { rectToDraw.setBounds(x, y, width, height); } else { rectToDraw = new Rectangle(x, y, width, height); } } public void capture() { BufferedImage croppedImage = origiImage.getSubimage(rectToDraw.x, rectToDraw.y, rectToDraw.width, rectToDraw.height); setSize(rectToDraw.width, rectToDraw.height); image = croppedImage; } public void upload(BufferedImage image) { String IMGUR_POST_URI = "http://api.imgur.com/2/upload.xml"; String IMGUR_API_KEY = "b84e430b4a65d16a6955358141f21a61"; String readLine = null; try { ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); ImageIO.write(image, "png", outputStream); URL url = new URL(IMGUR_POST_URI); String data = URLEncoder.encode("image", "UTF-8") + "=" + URLEncoder.encode(Base64.encodeBase64String(outputStream.toByteArray()).toString(), "UTF-8") + "&amp;" + URLEncoder.encode("key", "UTF-8") + "=" + URLEncoder.encode(IMGUR_API_KEY, "UTF-8"); URLConnection urlConnection = url.openConnection(); urlConnection.setDoOutput(true); OutputStreamWriter wr = new OutputStreamWriter(urlConnection.getOutputStream()); wr.write(data); wr.flush(); // Get the response InputStream inputStream; if (((HttpURLConnection) urlConnection).getResponseCode() == 400) { inputStream = ((HttpURLConnection) urlConnection).getErrorStream(); } else { inputStream = urlConnection.getInputStream(); } BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream)); String line; while ((line = reader.readLine()) != null) { readLine = line; } wr.close(); reader.close(); } catch(Exception e){ e.printStackTrace(); } //Prints the url link of the image uploaded System.out.println(readLine.substring(readLine.indexOf("&lt;original&gt;") + 10, readLine.indexOf("&lt;/original&gt;"))); } public void dragEnter(DropTargetDragEvent dtde) { } public void dragExit(DropTargetEvent dte) { } public void dragOver(DropTargetDragEvent dtde) { } public void dropActionChanged(DropTargetDragEvent dtde) { } private class CaptureListener extends MouseInputAdapter { public void mouseDragged(MouseEvent e) { updateSize(e); } public void mousePressed(MouseEvent e) { int x = e.getX(); int y = e.getY(); currentRect = new Rectangle(x, y, 0, 0); updateRectangle(getWidth(), getHeight()); repaint(); } public void mouseReleased(MouseEvent e) { updateSize(e); } public void updateSize(MouseEvent e) { currentRect.setSize(e.getX() - currentRect.x, e.getY() - currentRect.y); updateRectangle(getWidth(), getHeight()); repaint(); } } } </code></pre> <p>Can someone look through my code and find why it doesn't crop the exact same size?</p>
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    1. PO
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    1. This table or related slice is empty.
    1. PTQuestion
    1. USnullpotent
    1. USJonathan Beaudoin
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. PO
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    2. PO
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    1. This table or related slice is empty.
    1. COCould you please provide a **minimal** example for the problem you are having? For instance a short program that just takes a picture and crops a specified area. Asking others to debug your whole code is neither good style nor the way to get helpful answers soon.
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      1. POJava Image Cropping Not Accurate
      1. USzpea
    2. COAs you can see here, here is the area I selected. http://i.imgur.com/2uwzD.jpg And here is the outcome. http://i.imgur.com/dhTOU.png
      singulars
      1. POJava Image Cropping Not Accurate
      1. USJonathan Beaudoin
    3. COScreenshots are a good idea. They gave me a first hint of what might be wrong. However, this was not what I meant by 'minimal example'. I rather thought of a smaller version of your program illustrating just the problem. There is a lot of code in your program that is not related to the cropping issue. I hope it becomes a bit clearer in my answer. Let me know if it helps you (and ask if anything is unclear).
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      1. POJava Image Cropping Not Accurate
      1. USzpea
 

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