Develop Reference

Detect x y coordinates of specific text

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.

How to create Circular view on android wear?

How can I create circular list for round watch as in android wear 2.0 ?.
Like this:
Circular list is seen in android wear app launcher.

First of all you need to replace your ListView with a WearableRecyclerView.
It can be used like a normal ListView. But make sure, you import the right one from android.support.wear.widget. DON'T use the one from android.support.wearable.view. This one should be crossed out, so it won't take you long to check if you're using the right one. If there's just one WearableRecyclerViewto choose from, make sure to add compile 'com.android.support:wear:27.0.0' to the dependencies in your build.gradle (wear) file.
Also make sure that you're using <android.support.wear.widget.WearableRecyclerView/> in your activity.xml. If you just want a circular ListView without any custom item-scaling, just call this in your onLayoutInflated() method:
your_recyclerview.setEdgeItemsCenteringEnabled(true);
your_recyclerview.setLayoutManager(new WearableLinearLayoutManager(your_activity_context));
If you want to make items scaling up when they get closer to the center of your screen, things get a little more complicated.
First: paste this in your Activity.java:
private class CustomScrollingLayoutCallback extends WearableLinearLayoutManager.LayoutCallback {
private static final float MAX_ICON_PROGRESS = 2F;
#Override
public void onLayoutFinished(View child, RecyclerView parent) {
float centerOffset = ((float) child.getHeight() / 2.0f) / (float) parent.getHeight();
float yRelativeToCenterOffset = (child.getY() / parent.getHeight()) + centerOffset;
float progresstoCenter = (float) Math.sin(yRelativeToCenterOffset * Math.PI);
float mProgressToCenter = Math.abs(0.5f - yRelativeToCenterOffset);
mProgressToCenter = Math.min(mProgressToCenter, MAX_ICON_PROGRESS);
child.setScaleX(1 - mProgressToCenter);
child.setScaleY(1 - mProgressToCenter);
child.setX(+(1 - progresstoCenter) * 100);
}
}
Then go back to your onLayoutInflated() method, and type the following:
CustomScrollingLayoutCallback customScrollingLayoutCallback = new CustomScrollingLayoutCallback();
your_recycler_view.setLayoutManager(new WearableLinearLayoutManager(your_context, customScrollingLayoutCallback));
your_recycler_view.setCircularScrollingGestureEnabled(true);
done.

This is now possible with Android Wear 2.0's WearableRecyclerView.
According to Android Developer Docs:
Wear 2.0 introduces the WearableRecyclerView class for displaying and
manipulating a vertical list of items optimized for round displays.
WearableRecyclerView extends the existing RecyclerView class to
provide a curved layout and a circular scrolling gesture in wearable
apps.
You may like to read more about Android Wear 2.0 Preview 3.

Box2d - Is there a way to check whether there is a body at a specific location?

In my game, a body is randomly relocated on the screen after the user does something. However, if the object is relocated on top of another body, then both are pushed slightly (to make room!). I would like to check the location of the randomly generated coordinates first, so that the relocation only takes place if the position is free (within a certain diameter anyway).
Something like.. location.hasBody(). There surely must be a function for this that I haven't found. Thanks!

There is no way to query a world with a point and get the body, but what you can do is query the world with a small box:
// Make a small box.
b2AABB aabb;
b2Vec2 d;
d.Set(0.001f, 0.001f);
aabb.lowerBound = p - d;
aabb.upperBound = p + d;
// Query the world for overlapping shapes.
QueryCallback callback(p);
m_world->QueryAABB(&callback, aabb);
if (callback.m_fixture)
{
//it had found a fixture at that position
}
Solution originally posted here: Cocos2d-iphone forum

Not sure if box2d includes a 'clean' way to do it. I'd just manually iterate over all bodies in the world just before adding a new one, and manually check if their positions + radio/size overlap with the new body shape.

try
b2Vec2 vec = body->GetPosition(); // in meters
or
CGPoint pos = ccp(body->GetPosition().x * PTM_RATIO, body->GetPosition().y * PTM_RATIO); // in pixels

Graphing a curve with any android library

I've found several graphing libraries for android which would be very suitable for my school project e.g. GraphView
My task is to display 3 Biorhythm curves on one graph. I looked at many examples and helps but I just couldn't get my head around how to change the code so it will display my biorhythm curve.
// sin curve
int num = 150;
GraphViewData[] data = new GraphViewData[num];
double v = 0;
for (int i = 0; i < num; i++) {
v += 0.2;
data[i] = new GraphViewData(i, Math.sin(v));
}
The three biorhythm cycle equations are:
physical: sin(2\pi t/23),
emotional: sin(2\pi t/28),
intellectual: sin(2\pi t/33),
t = number of days since birth, this number has been calculated from the users input and is stored in a shared preference defined as differenceInDays
It would be awesome if someone could just give me an example, please do ask if I need to be more specific (this is my first time posting on this website) and if you have a suggestion to THE perfect graphing library in android please let me know :D

Implement page curl on android?

I was surfing the net looking for a nice effect for turning pages on Android and there just doesn't seem to be one. Since I'm learning the platform it seemed like a nice thing to be able to do is this.
I managed to find a page here: http://wdnuon.blogspot.com/2010/05/implementing-ibooks-page-curling-using.html
- (void)deform
{
Vertex2f vi; // Current input vertex
Vertex3f v1; // First stage of the deformation
Vertex3f *vo; // Pointer to the finished vertex
CGFloat R, r, beta;
for (ushort ii = 0; ii < numVertices_; ii++)
{
// Get the current input vertex.
vi = inputMesh_[ii];
// Radius of the circle circumscribed by vertex (vi.x, vi.y) around A on the x-y plane
R = sqrt(vi.x * vi.x + pow(vi.y - A, 2));
// Now get the radius of the cone cross section intersected by our vertex in 3D space.
r = R * sin(theta);
// Angle subtended by arc |ST| on the cone cross section.
beta = asin(vi.x / R) / sin(theta);
// *** MAGIC!!! ***
v1.x = r * sin(beta);
v1.y = R + A - r * (1 - cos(beta)) * sin(theta);
v1.z = r * (1 - cos(beta)) * cos(theta);
// Apply a basic rotation transform around the y axis to rotate the curled page.
// These two steps could be combined through simple substitution, but are left
// separate to keep the math simple for debugging and illustrative purposes.
vo = &outputMesh_[ii];
vo->x = (v1.x * cos(rho) - v1.z * sin(rho));
vo->y = v1.y;
vo->z = (v1.x * sin(rho) + v1.z * cos(rho));
}
}
that gives an example (above) code for iPhone but I have no idea how I would go about implementing this on android. Could any of the Math gods out there please help me out with how I would go about implementing this in Android Java.
Is it possible using the native draw APIs, would I have to use openGL? Could I mimik the behaviour somehow?
Any help would be appreciated. Thanks.
****************EDIT**********************************************
I found a Bitmap Mesh example in the Android API demos: http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/graphics/BitmapMesh.html
Maybe someone could help me out on an equation to simply fold the top right corner inward diagnally across the page to create a similar effect that I can later apply shadows to to gie it more depth?

I'm doing some experimenting on page curl effect on Android using OpenGL ES at the moment. It's quite a sketch actually but maybe gives some idea how to implement page curl for your needs. If you're interested in 3D page flip implementation that is.
As for the formula you're referring to - I tried it out and didn't like the result too much. I'd say it simply doesn't fit small screen very well and started to hack a more simple solution.
Code can be found here:
https://github.com/harism/android_page_curl/
While writing this I'm in the midst of deciding how to implement 'fake' soft shadows - and whether to create a proper application to show off this page curl effect. Also this is pretty much one of the very few OpenGL implementations I've ever done and shouldn't be taken too much as a proper example.

I just created a open source project which features a page curl simulation in 2D using the native canvas: https://github.com/moritz-wundke/android-page-curl
I'm still working on it to add adapters and such to make it usable as a standalone view.
EDIT: Links updated.
EDIT: Missing files has been pushed to repo.

I'm pretty sure, that you'd have to use OpenGL for a nice effect. The basic UI framework's capabilities are quite limited, you can only do basic transformations (alpha, translate, rotate) on Views using animations.
Tho it might be possible to mimic something like that in 2D using a FrameLayout, and a custom View in it.