I'm trying to make an epub reader
I want to do the pagination like fbreader does
Now I have source code of fbreader, but I don't know where it implement pagination
I have my implementation on other features
All I need from fbreader is the pagination
Is there anyone who have done the similar thing？
Thanks for your time to read this question.
ps: the pagination is to spit html file to pages, depending on the size of screen and size of font, and language is also in consideration， when changed the font size, the page number also changed. And epub file content is html format
It is fascinating code. I would love to see a translation of the original student project (but I presume the original document is in Russian). As this is a port of a C++ project it has an interesting style of coding in places.
The app keeps track of where you are in the book by using paragraph cursors (ZLTextParagraphCursor). This situation is comparative with database cursors and record pagination. The class that is responsible for serving up the current page and calculating the number of pages is ZLTextView.
As epubs are reflowable documents and not page-oriented there isn't really a concrete definition of a page - it just depends on where in the document you happen to be looking (paragraph, word, character) and with what display settings.
As McLaren says, FBReader doesn't implement pagination: It uses the ZLibrary, which is available from the same website as FBReader.
The original code uses this to calculate the current page number:
size_t ZLTextView::pageNumber() const {
if (textArea().isEmpty()) {
return 0;
}
std::vector<size_t>::const_iterator i = nextBreakIterator();
const size_t startIndex = (i != myTextBreaks.begin()) ? *(i - 1) : 0;
const size_t endIndex = (i != myTextBreaks.end()) ? *i :
textArea().model()->paragraphsNumber();
return (myTextSize[endIndex] - myTextSize[startIndex]) / 2048 + 1;
}
The Java version uses this function to compute the page number:
private synchronized int computeTextPageNumber(int textSize) {
if (myModel == null || myModel.getParagraphsNumber() == 0) {
return 1;
}
final float factor = 1.0f / computeCharsPerPage();
final float pages = textSize * factor;
return Math.max((int)(pages + 1.0f - 0.5f * factor), 1);
}
This is located in org.geometerplus.zlibrary.text.view.TextView
It's so simplistic, though, that you might as well implement your own.
How I understood it is that it uses 3 bitmaps previous current and next. What they have done is written a text which gets stored and read over this 3 bitmaps. Over as what you see on the top they calculate paragraphs data of how long it is for the scroll you see on the others example. You can start reverse engineering at android.view package class bitmapManager. This should explain everything about how they do their paging.
Related
I tried write an automation for my games in Android with Tasker and AutoTools plugins. Somethings ok at this point but i need capture the screenshot and need interpret it for my needs.
That's exactly what I need;
Some texts are important in games and i want to click on it wherever they are in the screen. So i need OCR for this task i think. I follow some solutions but fail or stuck everytime. Let me explain which solutions i tried.
Following Solution 1:
I tried AutoInput (Tasker plugin) UIQuery method but fail. Because UIQuery of AutoInput just works on android UI i think. Cant get any information from 3D App like games.
Following Solution 2:
I search OCR solution and find AutoTools (Tasker plugin)
Create a task and take screenshot and interpret it with AutoTools OCR method. Thats ok. AutoTools OCR succesfully read a text from Image file.
But i stuck again. Because i succesfully read a text from image file but i dont know x y coordinate of important text.
What suggest at this point?
Should i learn android and write own app?
You should checkout out the ocr-reader Google sample. It's quick to run and not too difficult to get what you're looking for. What you would need to do is modify the OcrDetectorProcess that comes with the sample to break down the text into individual words, then you can easily calculate the boundaries and center points of each word. Here's some code to get you started:
#Override
public void receiveDetections(Detector.Detections<TextBlock> detections) {
mGraphicOverlay.clear();
// Get all detected items.
SparseArray<TextBlock> items = detections.getDetectedItems();
for (int i = 0; i < items.size(); ++i) {
TextBlock item = items.valueAt(i);
// Get individual lines in each item.
List<Line> lines = (List<Line>) item.getComponents();
for (Line line : lines) {
// Get individual "words" in each line.
List<Element> elements = (List<Element>) line.getComponents();
for (Element e : elements) {
// Now get the position of each element.
Rect rect = e.getBoundingBox();
Point[] points = e.getCornerPoints();
int centerX = (points[0].x + points[2].x) / 2;
int centerY = (points[0].y + points[2].y) / 2;
// DO STUFF
}
}
}
}
I contact with the developer who write the "AutoTools" Tasker plugin.
He/She add some function to plugin and solve it.
Plugin, interpret with OCR granted image and return words and center of xy positions of each words now.
If anyone search like this function for Android and Tasker App please visit this forum topic link. Its very useful.
I've an Android app that needs to generate a PDF document with various data fetched from a database. Everything is working fine, included tables and checkboxes, that I generate with this snipped of code :
private PdfFormField WriteCheckbox(ref PdfContentByte pcb, float xPos, float yPos, string fldName, bool cbState)
{
yPos = yPos - 2f;
float cbDist = 1f;
Rectangle cbRect = new Rectangle(xPos, yPos, xPos + DEFAULT_CHECKBOX_SIZE, yPos + DEFAULT_CHECKBOX_SIZE);
RadioCheckField checkbox = new RadioCheckField(pcb.PdfWriter, cbRect, "", "");
checkbox.CheckType = RadioCheckField.TYPE_SQUARE;
checkbox.BorderColor = BaseColor.BLACK;
checkbox.BorderStyle = PdfBorderDictionary.STYLE_SOLID;
checkbox.BorderWidth = 0.5f;
checkbox.FieldName = fldName;
if(cbState)
{
pcb.SetLineWidth(1.2f);
pcb.MoveTo(xPos + DEFAULT_CHECKBOX_DISTANCE, yPos + cbDist);
pcb.LineTo(xPos + DEFAULT_CHECKBOX_SIZE - cbDist - 1, yPos + DEFAULT_CHECKBOX_SIZE - cbDist - 1);
pcb.MoveTo(xPos + DEFAULT_CHECKBOX_SIZE - cbDist - 1, yPos + cbDist);
pcb.LineTo(xPos + DEFAULT_CHECKBOX_DISTANCE, yPos + DEFAULT_CHECKBOX_SIZE - cbDist - 1);
}
pcb.Stroke();
return(checkbox.RadioField);
}
The resulting PDF is visualize correctly on the tablet (Nexus 7), but when I copy it con my PC and open if with Acrobat Reader all is at the correct place except the squares I draw to show the checkboxes. I can se the cross I draw inside the squares, but not the surrounding square. What is happening ?
This is the link to the pdf generated :
https://www.dropbox.com/s/p388bw7egjsbi80/curit_2015_2.pdf?dl=0
This is the link to the Nexus 7 screenshot showing the very same file :
Any hint would be very appreciated.
the squares I draw to show the checkboxes
Your code doesn't draw any squares.
What your code does, actually is surprising,
it creates numerous checkbox AcroForm form fields, none of them checked, none of them named, with a square visualization selection, and
it draws a cross in the page content in positions you seem to want to have appear checked.
So even if the created PDF was valid, it could irritate people, as they apparently could not de-select the pre-selected entries, merely select them a second time resulting in two overlapping crosses.
The reason why your checkbox borders only appear on some PDF viewers and not on others, is the same as explained in this answer to the question "iText - Java Android - Adding fields to existing pdf":
AcroForm form fields need to have a non-empty name. AcroForm forms contents are meant to be sent to some service for automatic evaluation, so they must be named and they must be distinguishable by their respective names.
Some PDF viewers recognize early that they couldn't properly handle fields with empty names and, therefore, don't even show them while other viewers recognize that later when trying to save or post the form, or don't recognize it at all, producing broken outputs.
But even after naming the boxes individually, you should decide whether you want to have AcroForm form fields or not. In the former case you would merely add properly named form fields and set them selected or not, and in the latter case you would draw complete checkbox appearances (not merely the check marks) in the page content and not use form fields at all.
I have developed an algorithm for android using OpenCV. I need to find overlap between the previous image and current frame. So, I have produced the template from previous image to match with current frame to make a photograph. It is the procedure to complete photographing. (Taking more than 10 picture)
Here is the code that I have developed to find the overlap.
public void overlapFinder(Mat inputFrame , Mat inputTemplate )
{
Mat mResult;
int resultWidth = inputFrame.width() - inputTemplate.width() + 1;
int resultHeight = inputFrame.height() - inputTemplate.height() + 1;
mResult = new Mat(resultHeight, resultWidth, CvType.CV_8U);
Imgproc.matchTemplate(inputFrame, inputTemplate, mResult,Imgproc.TM_CCORR_NORMED) ;
Core.MinMaxLocResult result = Core.minMaxLoc(mResult);
#SuppressWarnings("unused")
double maxVal = result.maxVal;
}
The problem is that when the "overlap function" is called after generating template from previous image, the application is crashed.
Would anyone please help me with that?
Thanks
Maybe you really need to do some debugging first, but in any case, I can see from your code that it would be worthwhile checking the sizes of your images - it seems that your code assumes the template is always smaller than the input frame.
If that's not true, you will get negative resultWidth and/or resultHeight, which will make it crash.
One other thing - the documentation suggests that the result type should be CV_32FC1.
PS - Try initialising your result like this:
mResult.create(resultHeight, resultWidth, CvType.CV_32FC1);
I am trying to develop a android runner game for school purpose..
I am still new to this and please I need your assistance..
You guys can view my CS5flash file at >>> http://www.filedropper.com/test_37
The obstacles and coins are on random. But the obstacles and coins are overlapping each other.. Which is very bad for a runner game because it looks very bad and the gameplay gets very very complicated.
How can i fix it??. Is there any way to fix it?.
And i am also thinking if I can set the obstacles and coins to a specific area (not on random). So the game will be more oganized and the gameplay won't be complicated. Which i still don't know -_-.
But i still prefer it on random. So guys please help me fix it..
You will need to change the way you are adding the coins and obstacles! I suggest using a timer for each. Atm you are adding a ton of them on every frame, calculating overlaps would use too much resources! and put them in an array or better a vector! i would reccomend using an object Pool aswell!
so limit the amout of coins and hurdles that can be present, like 5 or so. then remove them from the array/vector when they are offscreen or collected! then when you add new stuff you can check against the array/vector what the allowed values are!
when you got your Array you can pass it to the randomRange() function and exlcude those values!
would look somthing like this! not testet!!
function randomRange (min:Number, max:Number, exclude:Array = null):int
{
var val:int = (min + Math.random() * (max - min)) >> 0;
if (exclude)
{
for (var i:int = 0; i < exclude; i++)
{
while ((val < exclude[i].x + exclude[i].width) && (val > exclude[i].x))
{
val = (min + Math.random() * (max - min)) >> 0;
}
}
}
return val;
}
Its still quite exspensive performance wise. but with only a few object you should be fine
I am developing an android game with box2d and use a fixed timestep system for advancing the physics.
However as I use this system it requires the box2d positions to be interpolates. I read this article
and have implemented an interpolation method very much like the one in the article.
The method seems to work nicely on the computer but on my phone the positions of objects are very jumpy. There is of course a big frame rate difference between PC and phone, but I think this algorithm should not mind that.
Here is the just of the code if you don't feel like looking at the article :
void PhysicsSystem::smoothStates_ ()
{
const float oneMinusRatio = 1.f - fixedTimestepAccumulatorRatio_;
for (b2Body * b = world_->GetBodyList (); b != NULL; b = b->GetNext ())
{
if (b->GetType () == b2_staticBody)
{
continue;
}
PhysicsComponent & c = PhysicsComponent::b2BodyToPhysicsComponent (* b);
c.smoothedPosition_ =
fixedTimestepAccumulatorRatio_ * b->GetPosition () +
oneMinusRatio * c.previousPosition_;
c.smoothedAngle_ =
fixedTimestepAccumulatorRatio_ * b->GetAngle () +
oneMinusRatio * c.previousAngle_;
}
}
Does anyone know why my game is acting like this?
Thanks for the help
That code in and of itself doesn't appear to have any issues as compared to the article. You might want to try posting this on https://gamedev.stackexchange.com/ and see if they have any recommendations.
Alternatively, here is a very well written article about having a semi-fixed time step, and decoupling physics and frame rate, which I imagine could be the problem. It isn't for Box2D, but reading over it might help you pinpoint the issue with your physics.