Develop Reference

The part frames of a gif image which is created by using AnimatedGifEncoder class are not transparent

I have been stuck in a problem for a long time, that is when I use AnimatedGifEncoder class to create transparent GIF images, there are always a part of frames is opaque. There is my code.
AnimatedGifEncoder gifEncoder = new AnimatedGifEncoder();
gifEncoder.start("/Users/fengjiakang/Documents/result.gif");
gifEncoder.setRepeat(0);
gifEncoder.setFrameRate(800);
gifEncoder.setQuality(20);
gifEncoder.setTransparent(new Color(250, 250, 250));
Graphics2D g2d = null;
BufferedImage bg = null;
BufferedImage parentPngImg = null;
BufferedImage childImg = null;
ExecutorService executorService = Executors.newFixedThreadPool(13);
List<Future<BufferedImage>> futureResult = new ArrayList<Future<BufferedImage>>(13);
for (int i = 0; i < imageFrames.size(); i++) {
futureResult.add(executorService.submit(new MyCallable(imageFrames.get(i).getLayers(), imageFrames.get(i).getIdx())));
}
executorService.shutdown();
for (Future<BufferedImage> returnFrame : futureResult) {
BufferedImage bufferedImage = returnFrame.get();
gifEncoder.addFrame(bufferedImage);
}
gifEncoder.finish();
The MyCallable code is :
public BufferedImage call() throws Exception {
PicService picService = new PicServiceImpl();
BufferedImage childImg = null;
ImageLayer layer = imageLayers.get(0);
BufferedImage bg = null;
try {
bg = ImageIO.read(new File(pre + layer.getAsset_path().trim()));
BufferedImage parentPngImg = new BufferedImage(((Double) (bg.getWidth() * imageLayers.get(0).getW())).intValue(), ((Double) (bg.getHeight() * imageLayers.get(0).getH())).intValue(),
BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = parentPngImg.createGraphics();
//set a background color for each frame so that can use
//setTransparent() method to make frame transparent.
g2d.setColor(new Color(250, 250, 250));
g2d.fillRect(0, 0, bg.getWidth(), bg.getHeight());
for (int i = 0; i < imageLayers.size(); i++) {
childImg = ImageIO.read(new File(pre + imageLayers.get(i).getAsset_path().trim()));
picService.overlapImage(childImg, parentPngImg, imageLayers.get(i).getCx(), imageLayers.get(i).getCy(),
imageLayers.get(i).getW(), imageLayers.get(i).getH(), imageLayers.get(i).getR());
}
return parentPngImg;
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
And the result as below:
Can anybody help me to solve this problem?
Thanks in advance

Visual signature with pdfbox 1.8.8

I'm trying to produce PDF with visual signature and pdfbox. I have two streams and it seems that pdfbox can deal only with files. I didn't manage to make it work without three temporary files. I can see from here that API has changed, but still it deals with files.
public void signPdf(InputStream originalPdf, OutputStream signedPdf,
InputStream image, float x, float y,
String name, String location, String reason) {
File temp = null;
File temp2 = null;
File scratchFile = null;
RandomAccessFile randomAccessFile = null;
OutputStream tempOut = null;
InputStream tempIn = null;
try {
/* Copy original to temporary file */
temp = File.createTempFile("signed1", ".tmp");
tempOut = new FileOutputStream(temp);
copyStream(originalPdf, tempOut);
tempOut.close();
/* Read temporary file to second temporary file and stream */
tempIn = new FileInputStream(temp);
temp2 = File.createTempFile("signed2", ".tmp");
tempOut = new FileOutputStream(temp2);
copyStream(tempIn, tempOut);
tempIn.close();
tempIn = new FileInputStream(temp2);
scratchFile = File.createTempFile("signed3", ".bin");
randomAccessFile = new RandomAccessFile(scratchFile, "rw");
/* Read temporary file */
PDDocument document = PDDocument.load(temp, randomAccessFile);
document.getCurrentAccessPermission().setCanModify(false);
PDSignature signature = new PDSignature();
signature.setFilter(PDSignature.FILTER_ADOBE_PPKLITE);
signature.setSubFilter(PDSignature.SUBFILTER_ADBE_PKCS7_DETACHED);
signature.setName(name);
signature.setLocation(location);
signature.setReason(reason);
signature.setSignDate(Calendar.getInstance());
PDVisibleSignDesigner signatureDesigner = new PDVisibleSignDesigner(
document, image, document.getNumberOfPages());
signatureDesigner.xAxis(250).yAxis(60).zoom(-90).signatureFieldName("signature");
PDVisibleSigProperties signatureProperties = new PDVisibleSigProperties();
signatureProperties.signerName(name).signerLocation(location)
.signatureReason(reason).preferredSize(0).page(1)
.visualSignEnabled(true).setPdVisibleSignature(signatureDesigner)
.buildSignature();
SignatureOptions options = new SignatureOptions();
options.setVisualSignature(signatureProperties);
document.addSignature(signature, dataSigner, options);
/* Sign */
document.saveIncremental(tempIn, tempOut);
document.close();
tempIn.close();
/* Copy temporary file to an output stream */
tempIn = new FileInputStream(temp2);
copyStream(tempIn, signedPdf);
} catch (IOException e) {
logger.error("PDF signing failure", e);
} catch (COSVisitorException e) {
logger.error("PDF creation failure", e);
} catch (SignatureException e) {
logger.error("PDF signing failure", e);
} finally {
closeStream(originalPdf);
closeStream(signedPdf);
closeStream(randomAccessFile);
closeStream(tempOut);
deleteTempFile(temp);
deleteTempFile(temp2);
deleteTempFile(scratchFile);
}
}
private void deleteTempFile(File tempFile) {
if (tempFile != null && tempFile.exists() && !tempFile.delete()) {
tempFile.deleteOnExit();
}
}
private void closeStream(Closeable is) {
if (is!= null) {
try {
is.close();
} catch (IOException e) {
logger.error("failure", e);
}
}
}
private void copyStream(InputStream is, OutputStream os) throws IOException {
byte[] buffer = new byte[1024];
int c;
while ((c = is.read(buffer)) != -1) {
os.write(buffer, 0, c);
}
is.close();
}
Apart from file madness I don't see any text on the signature. This is how result looks like:
and this is how it looks, when I do similar thing with itext library
Why name, location and reason missing from the visual signature representation? How can I fix that?

Why name, location and reason missing from the visual signature representation?
They are not there because they are not drawn.
The default way of iText to represent a visualized signature is by adding those information to the visualization.
The default way of PDFBox' PDVisibleSigBuilder to represent a visualized signature is without such information.
Neither is wrong or right, both merely are defaults.
The canonical place where people shall look for such information is the signature panel after all.
How can I fix that?
The actual contents of the signature visualization are created by a PDVisibleSigBuilder instance during signatureProperties.buildSignature():
public void buildSignature() throws IOException
{
PDFTemplateBuilder builder = new PDVisibleSigBuilder();
PDFTemplateCreator creator = new PDFTemplateCreator(builder);
setVisibleSignature(creator.buildPDF(getPdVisibleSignature()));
}
Thus, by replacing
signatureProperties.signerName(name).signerLocation(location)
.signatureReason(reason).preferredSize(0).page(1)
.visualSignEnabled(true).setPdVisibleSignature(signatureDesigner)
.buildSignature();
in your code by
signatureProperties.signerName(name).signerLocation(location)
.signatureReason(reason).preferredSize(0).page(1)
.visualSignEnabled(true).setPdVisibleSignature(signatureDesigner);
PDFTemplateBuilder builder = new ExtSigBuilder();
PDFTemplateCreator creator = new PDFTemplateCreator(builder);
signatureProperties.setVisibleSignature(creator.buildPDF(signatureProperties.getPdVisibleSignature()));
for a customized version ExtSigBuilder of this PDVisibleSigBuilder class, you can draw anything you want there, e.g.:
class ExtSigBuilder extends PDVisibleSigBuilder
{
String fontName;
public void createImageForm(PDResources imageFormResources, PDResources innerFormResource,
PDStream imageFormStream, PDRectangle formrect, AffineTransform affineTransform, PDJpeg img)
throws IOException
{
super.createImageForm(imageFormResources, innerFormResource, imageFormStream, formrect, affineTransform, img);
PDFont font = PDType1Font.HELVETICA;
fontName = getStructure().getImageForm().getResources().addFont(font);
logger.info("Added font to image form: " + fontName);
}
public void injectAppearanceStreams(PDStream holderFormStream, PDStream innterFormStream, PDStream imageFormStream,
String imageObjectName, String imageName, String innerFormName, PDVisibleSignDesigner properties)
throws IOException
{
super.injectAppearanceStreams(holderFormStream, innterFormStream, imageFormStream, imageObjectName, imageName, innerFormName, properties);
String imgFormComment = "q " + 100 + " 0 0 50 0 0 cm /" + imageName + " Do Q\n";
String text = "BT /" + fontName + " 10 Tf (Hello) Tj ET\n";
appendRawCommands(getStructure().getImageFormStream().createOutputStream(), imgFormComment + text);
logger.info("Added text commands to image form: " + text);
}
}
writes "Hello" in Helvetica at size 10 atop the lower left of the image form (the form actually displaying something).
PS: In my opinion the object oriented structure behind this should be completely overhauled.

Display the text over the signatory some time it doesn't look nice. For me, I create new image base on the text that I want to display. And merge it with the signatory image. I can add background for signatory image (company name watermark)
Here is the code create new signatory image with text and background:
public class ImageSignatory {
public static void main(String[] args) {
DateFormat df = new SimpleDateFormat("MM.dd.yyyy");
Date today = Calendar.getInstance().getTime();
String reportDate = df.format(today);
String text = "Signature eletronic Company AA DUC NGUYEN - Date " + reportDate;
String background = "background.png";
String signImage = "sign.jpg";
String textImage = createImageFromText(text);
String imageResultURL = null ;
try {
String mergedImage = mergeTwoImage(signImage, textImage);
imageResultURL = addBackgroundToImage(background, mergedImage);
} catch (Exception ex) {
}
}
public static String StringDivider(String s) {
StringBuilder sb = new StringBuilder(s);
int i = 0;
while ((i = sb.indexOf(" ", i + 30)) != -1) {
sb.replace(i, i + 1, "\n");
}
return sb.toString();
}
public static BufferedImage toBufferedImage(Image img) {
if (img instanceof BufferedImage) {
return (BufferedImage) img;
}
BufferedImage bimage = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_ARGB);
Graphics2D bGr = bimage.createGraphics();
bGr.drawImage(img, 0, 0, null);
bGr.dispose();
return bimage;
}
public static String addBackgroundToImage(String backgroundPATH, String imagePath) {
try {
String imageResult = "result.jpg";
Image backgroundImage = ImageIO.read(new File(backgroundPATH));
int width = backgroundImage.getWidth(null);
int height = backgroundImage.getHeight(null);
Image signAndText = ImageIO.read(new File(imagePath));
signAndText = signAndText.getScaledInstance(width, height, Image.SCALE_SMOOTH);
signAndText = toBufferedImage(signAndText);
BufferedImage combined = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g2 = combined.getGraphics();
g2.drawImage(backgroundImage, 0, 0, null);
g2.drawImage(signAndText, 0, 0, null);
g2.dispose();
ImageIO.write(combined, "JPG", new File(imageResult));
return imageResult;
} catch (IOException ex) {
return null;
}
}
public static String mergeTwoImage(String first, String second) {
try {
String tempFileName = "merged_image.png";
Image signatoryImage = ImageIO.read(new File(first));
Image addtionalTextImage = ImageIO.read(new File(second));
float ratio = (float) signatoryImage.getWidth(null) / (float) addtionalTextImage.getWidth(null);
addtionalTextImage = addtionalTextImage.getScaledInstance((int) (ratio * (float) addtionalTextImage.getWidth(null)), (int) (ratio * (float) addtionalTextImage.getHeight(null)), Image.SCALE_SMOOTH);
addtionalTextImage = toBufferedImage(addtionalTextImage);
BufferedImage combinedTemp = new BufferedImage(signatoryImage.getWidth(null), signatoryImage.getHeight(null) + (int) (ratio * (float) addtionalTextImage.getHeight(null)), BufferedImage.TYPE_INT_ARGB);
Graphics g = combinedTemp.getGraphics();
g.drawImage(signatoryImage, 0, 0, null);
g.drawImage(addtionalTextImage, 0, signatoryImage.getHeight(null), null);
g.dispose();
ImageIO.write(combinedTemp, "PNG", new File(tempFileName));
return tempFileName;
} catch (IOException ex) {
return null;
}
}
public static String createImageFromText(String text) {
String tempFileName = "text.png";
text = StringDivider(text);
String[] textParts = text.split("\n");
BufferedImage img = new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = img.createGraphics();
Font font = new Font("Arial", Font.PLAIN, 48);
g2d.setFont(font);
FontMetrics fm = g2d.getFontMetrics();
int width = 0;
for (String textPart : textParts) {
int tempWidth = fm.stringWidth(textPart);
if (tempWidth > width) {
width = tempWidth;
}
}
width += 10;
int oneLineHeight = fm.getHeight();
int height = (oneLineHeight) * textParts.length;
g2d.dispose();
img = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
g2d = img.createGraphics();
g2d.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE);
g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);
g2d.setFont(font);
fm = g2d.getFontMetrics();
g2d.setColor(Color.BLACK);
int index = 0;
for (String textPart : textParts) {
g2d.drawString(textPart, 5, (oneLineHeight) * index + fm.getAscent());
index++;
}
g2d.dispose();
try {
ImageIO.write(img, "PNG", new File(tempFileName));
} catch (IOException ex) {
return null;
}
return tempFileName;
}
public static void removeFile(String fileName) {
try {
File file = new File(fileName);
file.delete();
} catch (Exception ex) {
}
}
}

Overlaying of 2 images doesnt work properly

I am trying to merge two images a PNG/TIFF file over a JPEG image. I am using the following code
try {
image = ImageIO.read(new File("C:\\Users\\user\\Desktop\\test\\a.jpg"));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
BufferedImage overlay = null;
try {
overlay = ImageIO.read(new File("C:\\Users\\user\\Desktop\\test\\b.png"));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// create the new image, canvas size is the max. of both image sizes
int w = Math.max(image.getWidth(), overlay.getWidth());
int h = Math.max(image.getHeight(), overlay.getHeight());
BufferedImage combined = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
// paint both images, preserving the alpha channels
Graphics2D g = combined.createGraphics();
/**Set Antialias Rendering**/
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
/**
* Draw background image at location (0,0)
* You can change the (x,y) value as required
*/
g.drawImage(image, 0, 0, null);
/**
* Draw foreground image at location (0,0)
* Change (x,y) value as required.
*/
g.drawImage(overlay, 0, 0, null);
g.dispose();
// Save as new image
try {
ImageIO.write(combined, "JPG", new File("C:\\Users\\user\\Desktop\\test\\c.jpg"));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
But, then final image that is forming is not according to what i want. Please refer to the attached images for clarity.

import java.awt.*;
import java.awt.image.BufferedImage;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.*;
class CombineImages {
public static void main(String[] args) throws Exception {
URL urlImage1 = new URL("http://i.stack.imgur.com/T5uTa.png");
// Load the FG image (must have transparent parts)
final Image fgImage = ImageIO.read(urlImage1);
int w = fgImage.getWidth(null);
int h = fgImage.getHeight(null);
// Create a non-trasparent BG image
final BufferedImage bgImage =
new BufferedImage(w,h,BufferedImage.TYPE_INT_RGB);
// Create the final image
final BufferedImage finalImage =
new BufferedImage(w,h,BufferedImage.TYPE_INT_RGB);
Graphics2D g = finalImage.createGraphics();
g.drawImage(bgImage, 0, 0, null);
g.drawImage(fgImage, 0, 0, null);
g.dispose();
Runnable r = new Runnable() {
#Override
public void run() {
JPanel gui = new JPanel(new GridLayout(1,0,5,5));
gui.add(new JLabel(new ImageIcon(bgImage)));
gui.add(new JLabel(new ImageIcon(fgImage)));
gui.add(new JLabel(new ImageIcon(finalImage)));
JOptionPane.showMessageDialog(null, gui);
}
};
// Swing GUIs should be created and updated on the EDT
// http://docs.oracle.com/javase/tutorial/uiswing/concurrency/initial.html
SwingUtilities.invokeLater(r);
}
}

panel background image take screenshot

I'm trying to draw over an image (with the mouse) in a JPanel, this is working, but when I try to take an screenshot of the panel and generate an image of this, I only can see the image background without drawn with the mouse.
This is my code to generate the background Panel.java
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(this.createImage("/imagenes/cuerpoHumano.png").getImage(), 0, 0, null);
}
This is my code to draw as a pencil over the image: Panel.java
private void formMouseDragged(java.awt.event.MouseEvent evt) {
x = evt.getX();
y = evt.getY();
this.getGraphics().setColor(Color.RED);
this.getGraphics().fillOval(x, y, 4, 4);
}
This is the code to generate an screenshot
Dimension size = panel.getSize();
BufferedImage image = (BufferedImage) panel.createImage(size.width, size.height);
Graphics g = image.getGraphics();
panel.paint(g);
g.dispose();
try {
String fileName = UUID.randomUUID().toString().substring(0, 18);
ImageIO.write(image, "jpg", new File(path, fileName + ".jpg"));
} catch (IOException e) {
e.printStackTrace();
}

When you are taking the screenshot, the paintComponent() method is called. This means it will only paint you the image. You have to store the mouse move inside some model and paint the contents of the model in the paintComponent() method. This method is triggered by calling repaint() on the panel during the mouse move.

I think this is code that works .
public class PanelImagenCuerpoHumano extends JPanel {
private int x = -1;
private int y = -1;
private Image image = null;
private ArrayList<Point> puntos = new ArrayList<Point>();
public PanelImagenCuerpoHumano() {
image = new ImageIcon(getClass()
.getResource("/imagenes/cuerpoHumano.png")).getImage();
this.addMouseMotionListener(new MouseMotionListener() {
#Override
public void mouseDragged(MouseEvent e) {
x = e.getX();
y = e.getY();
puntos.add(new Point(x, y));
repaint();
}
#Override
public void mouseMoved(MouseEvent e) {
}
});
}
#Override
protected void paintComponent(Graphics g) {
g.drawImage(image, 0, 0, null);
for (Point p : puntos) {
g.setColor(Color.red);
g.fillOval(p.x, p.y, 3, 3);
}
}
}

Extracting images from pptx with apache poi

I'm trying to extract slides from a ppt file with Apache POI, there is no problem in that, but now I intend to open pptx files and do the same, does anyone knows how to??
this is the code to extract images from ppt files:
public ImageIcon display() throws JPresentationException {
Background background;
background = slides[current].getBackground();
Fill f = background.getFill();
Color color = f.getForegroundColor();
Dimension dimension = ppt.getPageSize();
shapes = slides[current].getShapes();
BufferedImage img = new BufferedImage(dimension.width, dimension.height, BufferedImage.TYPE_INT_RGB);
Graphics2D graphics = img.createGraphics();
graphics.setPaint(color);
graphics.fill(new Rectangle2D.Float(0, 0, dimension.width, dimension.height));
slides[current].draw(graphics);
ImageIcon icon = new ImageIcon(img);
return icon;
}

Although you can refer to some example code from the POI project itself
below is what you should be looking for; Hope this helps;
private ImageIcon generateFromPPTX(int index) {
ImageIcon icon = null;
XMLSlideShow slideShowPPTX = null;
FileInputStream pptInputStream = null;
XSLFSlide [] allSlides = null;
XSLFSlide singleSlide = null;
BufferedImage memoryImage = null;
Graphics2D graphics = null;
try{
pptInputStream = new FileInputStream("somepptx-file.pptx");
slideShowPPTX = new XMLSlideShow(pptInputStream);
allSlides = slideShowPPTX.getSlides();
if(allSlides == null || allSlides.length == 0) {
System.out.println("Empty presentation!");
return null;
}
singleSlide = allSlides [index];
memoryImage = new BufferedImage(slideShowPPTX.getPageSize().width, slideShowPPTX.getPageSize().height, BufferedImage.TYPE_INT_ARGB);
graphics = memoryImage.createGraphics();
// Only few rendering hints set but you can set as many as you need depending on your need
graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
graphics.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
graphics.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
graphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
singleSlide.draw(graphics);
icon = new ImageIcon(memoryImage);
}
catch(IOException exception){
System.err.println("Input/output Exception:");
exception.printStackTrace();
}
finally{
slideShowPPTX = null;
allSlides = null;
singleSlide = null;
memoryImage = null;
graphics = null;
if(pptInputStream != null){
try {
pptInputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
pptInputStream = null;
}
}
return icon;
}

Here's the way to do it in VBS, Maybe you can convert :
Sub SaveAllPictures()
Dim ap As Presentation: Set ap = ActivePresentation
Dim savePath As String
savePath = "C:\Users\me\Desktop\files\"
Dim i As Integer
Dim sl As Slide
Dim sh As Shape
For Each sl In ap.Slides
For Each sh In sl.Shapes
If sh.Type = msoPicture Then
sh.Export PathName:=savePath & sh.Name & CStr(i) & ".png", Filter:=ppShapeFormatPNG
i = i + 1
End If
Next
Next
End Sub