In my project, I want to find co-ordinates of image in pdf. I tried searching itext and pdfbox, but I was not succesful. Using these co-ordinates and extracted image, I want to verify whether the extracted image is same as image present in database, and co-ordinates of image are same as present in database.
When you say that you've tried with iText, I assume that you've used the ExtractImages example as the starting point for your code. This example uses the helper class MyImageRenderListener, which implements the RenderListener interface.
In that helper class the renderImage() method is implemented like this:
public void renderImage(ImageRenderInfo renderInfo) {
try {
String filename;
FileOutputStream os;
PdfImageObject image = renderInfo.getImage();
if (image == null) return;
filename = String.format(path, renderInfo.getRef().getNumber(), image.getFileType());
os = new FileOutputStream(filename);
os.write(image.getImageAsBytes());
os.flush();
os.close();
} catch (IOException e) {
System.out.println(e.getMessage());
}
}
It uses the ImageRenderInfo object to obtain a PdfImageObject instance and it creates an image file using that object.
If you inspect the ImageRenderInfo class, you'll discover that you can also ask for other info about the image. What you need, is the getImageCTM() method. This method returns a Matrix object. This matrix can be interpreted using ordinary high-school algebra. The values I31 and I32 give you the X and Y position. In most cases I11 and I22 will give you the width and the height (unless the image is rotated).
If the image is rotated, you'll have to consult your high-school schoolbooks, more specifically the ones discussing analytic geometry.
Related
Language: Kotlin,
GUI Library: Swing,
IDE: IntelliJ IDEA
I know that there are similarly phrased questions, but note that I want to add multiple images, not just one, to any type of JComponent that holds other components. For example, I am not concerned with adding an image to a JLabel, I already know how to do that. I want to know how to add an image to a JFrame, JPanel, Container, etc.; all things that hold other Components (and have an add(Component) function). Finally, I don't want that workaround where you add the image to a JLabel with no text and then add that to the container. I would like to just use the Image class or a subset like BufferedImage or URL.
I want to be able to call the add() method from the Container class, jFrame.add(component) for example, where component is some sort of image. I want this to result in an image being displayed on the screen.
The ImageIcon class is not a Component so this can't be input on its own. I think I would have to create some sort of custom Image class that extends from Component or JComponent, but I don't know what I would have to override to get that to display an image on screen when added to another JComponent. There are multiple solutions to this, but to clarify, I don't want some kind of "middle man" where I add a JLabel or JButton or something that only contains an Icon. I don't want to display icons anyway, I want to display full-sized images anywhere on the screen. I will provide a possible example of what I want the final result to look like.
class MyApp() {
fun init() {
var jFrame = JFrame()
jFrame.add(Image("filepath/image.png"))
//Some other JFrame boiler plate
jFrame.isVisible = true
}
}
fun main() {
MyApp().init()
}
The unclear part is the Image class, and whether that's a custom class that inherits JImage, or some already defined class or method I don't know about. I know about ImageIO and BufferedImage and ImageIcon, but none of them directly go into this method, as they don't inherit Component or JComponent.
EDIT:
I tried using Camickr's second solution, but it didn't work. I will post the code to see if a made a simple mistake.
import java.awt.Image as AWTImage
import java.awt.Image.*
//Including these imports as I used name alias so I had to say what it was from.
open class JImage(var point: Point = Point(0, 0), image: AWTImage): JComponent() {
var image: ImageIcon = ImageIcon(image)
override fun paintComponent(g: Graphics?) {
super.paint(g)
g?.drawImage(image.image, point.x.toInt(), point.y.toInt(), null)
}
}
class SplashScreen(image: JImage): Frame() {
init {
//jFrame.isUndecorated = true
jFrame.add(image)
}
}
class MyApp {
fun init() {
var jFrame = SplashScreen(JImage(image = ImageIO.read(Loader().getClassLoader().getResourceAsStream("resources/images/splashscreen/SplashScreen.png"))).getScaledInstance(Size(1000, 1000*3/5)))
jFrame.isVisible = true
}
}
fun main() {
MyApp().init()
}
FINAL EDIT:
Okay, so I did make a simple mistake when trying this solution. I overrode paintComponent() but then inside it, I called super.paint(). Additionally, I realized I didn't have to use the ImageIcon class, which I didn't want to do anyway. This is the Image class I have come up with.
open class JImage(var point: Point = Point(0, 0), var image: AWTImage): JComponent() {
fun getScaledInstance(size: Size, scalingMethods: ScalingMethods = ScalingMethods.DEFAULT): JImage {
val scale: Int = when(scalingMethods) {
ScalingMethods.DEFAULT -> SCALE_DEFAULT
ScalingMethods.FAST -> SCALE_FAST
ScalingMethods.AREA_AVERAGING -> SCALE_AREA_AVERAGING
ScalingMethods.REPLICATE -> SCALE_REPLICATE
ScalingMethods.SMOOTH -> SCALE_SMOOTH
}
return JImage(point, image.getScaledInstance(size.width.toInt(), size.height.toInt(), scale))
}
override fun paintComponent(g: Graphics?) {
super.paintComponent(g)
g?.drawImage(image, point.x.toInt(), point.y.toInt(), null)
}
}
I want to know how to add an image to a JFrame, JPanel, Container, etc.
You don't add an image to a JFrame, JPanel etc. As you said an image is not a component. You add the image to a JLabel and add the label to the panel. This is the easiest and more direct way to display an image at its actual size.
Don't know if Kotlin is any different, but the other option is to do custom painting and paint the image on a JPanel by overriding the paintComponent(…) method and using the Graphics.drawImage(…) method and then add the panel to the frame. Read the Swing tutorial on Custom Painting for painting basics.
You can also check out Background Panel for an example that paints an image as a background of the panel. The image can be:
painted at its real size
scaled to fill the panel
tiled to fill the panel
Just note that the image should NOT be read in the paintComponent() method as painting code should be efficient.
I have currently developed an ultimately open source application to analyse some data in a table view and visualise the resulting data in some additional plots. A problematic thing with this is, that the generated plots could potentially be useful for end users for e.g. a presentation, further downstream informative discussion and so on. This is why I started working on an export function using ImageWriter
//adding a context menu item to the chart
final MenuItem saveAsPng = new MenuItem("Save as png");
saveAsPng.setOnAction(new EventHandler<ActionEvent>() {
#Override public void handle(ActionEvent event) {
int scale = 6; //6x resolution should be enough, users should downscale if required
final Bounds bounds = bc.getLayoutBounds();
final SnapshotParameters spa = new SnapshotParameters();
spa.setTransform(javafx.scene.transform.Transform.scale(scale, scale));
ImageWriter imageWriter = new ImageWriter();
try {
imageWriter.saveImage(stage, bc.snapshot(spa, null));
} catch (ImageException e) {
e.printStackTrace();
}
}
});
This successfully creates a PNG file with sufficient size, but my ideal solution would be to export in vector-based format, e.g. PDF/SVG. For Swing applications, I knew how to achieve this, but for JFX I couldn't really find a proper solution for that matter. I already investigated several potential ideas, e.g. using a printer dialogue and then exporting as a PDF via virtual printer, but that does result in a bitmap inside the PDF, too.
Any ideas on this?
Guys Im using the following custom code to load 20 images from resources and present in a viewpager
public class CustomPagerAdapter extends PagerAdapter {
int[] mResources = {
R.drawable.slide1,
R.drawable.slide2,
R.drawable.slide3,
R.drawable.slide4,
R.drawable.slide5,
R.drawable.slide6,
R.drawable.slide7,
R.drawable.slide8,
R.drawable.slide9,
R.drawable.slide10,
R.drawable.slide11,
R.drawable.slide12,
R.drawable.slide13,
R.drawable.slide14,
R.drawable.slide15,
R.drawable.slide16,
R.drawable.slide17,
R.drawable.slide18,
R.drawable.slide19,
R.drawable.slide20,
};
Context mContext;
LayoutInflater mLayoutInflater;
public CustomPagerAdapter(Context context) {
mContext = context;
mLayoutInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
return mResources.length;
}
#Override
public boolean isViewFromObject(View view, Object object) {
return view == ((LinearLayout) object);
}
#Override
public Object instantiateItem(ViewGroup container, int position) {
View itemView = mLayoutInflater.inflate(R.layout.pager_item, container, false);
ImageView imageView = (ImageView) itemView.findViewById(R.id.imageView);
imageView.setImageResource(mResources[position]);
container.addView(itemView);
return itemView;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((LinearLayout) object);
}
}
This works fine but I want to put the jpgs in a directory on the device so that they can be changed without recompiling the app
I think I need to get the images into the mResource array. I can get the path but not sure what format the code should be instead of using the draw-able lines
i have read articles on here but none make sense to me I am really new to this and the code looks nothing like the code I am using
can anyone point me in the right direction?
Any help is greatly appreciated
Mark
Yes, you can certainly do so. I will try to explain you the process step-by-step,
Step 1
Have a File object pointing to the path, like,
File directory = new File("path-to-directory");
Ensure that the path is to the directory with the images,
Step 2
List all the files inside the directory using listFiles() method, like
File[] allImages = directory.listFiles();
Now you have an array of all the files just like int[] mResources. The only difference being, now you have actual file references, while previously you had resource ids.
Step 3
You can just display the images in the ViewPager just like you did previously. But this is a bit tricky and can take you a considerable amount of time and code to get an image properly displayed from File.
You also need to take care of caching, so that when you load a previously loaded image again, it gets it from the cache.
To do all this, I recommend you to use this library (recommended by Google), Glide.
Setting an image is one line of code,
Glide.with(context).from(file).into(imageView);
That's it. Now you have your images displayed in a ViewPager from a directory in the device.
Using Rajawali library i loaded object from obj file
LoaderOBJ objParser = new LoaderOBJ(mContext.getResources(),
mTextureManager, R.raw.fridge_obj);
loadModel(objParser, new IAsyncLoaderCallback() {
#Override
public void onModelLoadComplete(ALoader loader) {
Log.d(TAG, "Model load complete: " + loader);
final LoaderOBJ obj = (LoaderOBJ) loader;
mObjectGroup = obj.getParsedObject();
getCurrentScene().addChild(mObjectGroup);
}
#Override
public void onModelLoadFailed(ALoader loader) {
Log.e(TAG, "Model load failed: " + loader);
}
}, R.raw.fridge_obj);
now i want get object center of gravity point to set it on world zero point and rotate over that point. I try to get data from Geometry3D how ever i BoundingBox is null same as Vertices field.
How can i get object center of gravity without change object file?
Rajawali currently includes no method for calculating the centroid of an object. If you create a well formatted and worded issue on the github page, we can mark it as a feature request and work on adding it as it would be a useful addition.
You can load your .obj into blender and change the pivot with CTRL + ALT + SHIFT + C. Rajawali will then use the new pivot.
For the past few hours I have been trying to clone an image in Flex (using the Spark Components, but also trying to convert between Bitmap and BitmapImage).
What I am trying exactly is to create a simple painting application which keeps track of each Brush-Stroke. As soon as the Image on the Canvas has changed, it is to be cloned and then the clone is to be put into the History-Panel on the bottom of the application.
Things I have tried include:
Using ObjectUtils.clone(Object)
Creating BitmapData from Image.content, then making it a Bitmap and simply display it (Image doesn't have a content field, it says)
Performing a byte-copy
and others I could find on the internet, of course.
So basically, how does one clone an Image (Spark Image) in Flex 4.6?
Thank you very much!
-- Danny Nophut
Instead of cloning you can get the image of the drawing and set the bitmap of the image as source to the history image, do some thing like this
private function getBitmapData( target:DisplayObject ) : BitmapData
{
//target.width and target.height can also be replaced with a fixed number.
var bd : BitmapData = new BitmapData( target.width, target.height );
bd.draw( target );
return bd;
}
In some case if the width and height of the target is not working you can use the getbounds method to get the bounds of the object and from the bounds take the width and height.
There's a clone function on a bitmapdata:
public class EZB2ParkObject extends Image implements IEZB2ParkObject
{
public function clone():IEZB2ParkObject{
var n:IEZB2ParkObject = new EZB2ParkObject();
n.id = this.id;
n.source = new Bitmap(BitmapData(this.source.bitmapData).clone());
n.dimensions = this.dimensions;
n.assetId = this.assetId;
return n;
}
}