pixel | A hand-crafted 2D game library in Go | Graphics library
kandi X-RAY | pixel Summary
kandi X-RAY | pixel Summary
A hand-crafted 2D game library in Go. Take a look into the features to see what it can do.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of pixel
pixel Key Features
pixel Examples and Code Snippets
Lines of Code : 12License : Non-SPDX
Copyprivate static void printBlackPixelCoordinate(Buffer buffer) {
StringBuilder log = new StringBuilder("Black Pixels: ");
var pixels = buffer.getPixels();
for (var i = 0; i < pixels.length; ++i) {
if (pixels[i] == Pixel.BLACK) {
public static void putPixel(int[][] image, int x, int y, int newColor) {
image[x][y] = newColor;
} public static int getPixel(int[][] image, int x, int y) {
return image[x][y];
} Community Discussions
Trending Discussions on pixel
QUESTION
This question is about two MAUI controls (Switch and ListView) - I'm asking about them both in the same question as I'm expecting the root cause of the problem to be the same for both controls. It's entirely possible that they're different problems that just share some common symptoms though. (CollectionView has similar issues, but other confounding factors that make it trickier to demonstrate.)
I'm using 2-way data binding in my MAUI app: changes to the data can either come directly from the user, or from a background polling task that checks whether the canonical data has been changed elsewhere. The problem I'm facing is that changes to the view model are not visually propagated to the Switch.IsToggled and ListView.SelectedItem properties, even though the controls do raise events showing that they've "noticed" the property changes. Other controls (e.g. Label and Checkbox) are visually updated, indicating that the view model notification is working fine and the UI itself is generally healthy.
Build environment: Visual Studio 2022 17.2.0 preview 2.1
App environment: Android, either emulator "Pixel 5 - API 30" or a real Pixel 6
The sample code is all below, but the fundamental question is whether this a bug somewhere in my code (do I need to "tell" the controls to update themselves for some reason?) or possibly a bug in MAUI (in which case I should presumably report it)?
Sample codeThe sample code below can be added directly a "File new project" MAUI app (with a name of "MauiPlayground" to use the same namespaces), or it's all available from my demo code repo. Each example is independent of the other - you can try just one. (Then update App.cs to set MainPage to the right example.)
Both examples have a very simple situation: a control with two-way binding to a view-model, and a button that updates the view-model property (to simulate "the data has been modified elsewhere" in the real app). In both cases, the control remains unchanged visually.
Note that I've specified {Binding ..., Mode=TwoWay} in both cases, even though that's the default for those properties, just to be super-clear that that isn't the problem.
The ViewModelBase code is shared by both examples, and is simply a convenient way of raising INotifyPropertyChanged.PropertyChanged without any extra dependencies:
ViewModelBase.cs:
...ANSWER
Answered 2022-Apr-09 at 18:07These both may be bugs with the currently released version of MAUI.
This bug was recently posted and there is already a fix for the Switch to address this issue.
QUESTION
I have source (src) image(s) I wish to align to a destination (dst) image using an Affine Transformation whilst retaining the full extent of both images during alignment (even the non-overlapping areas).
I am already able to calculate the Affine Transformation rotation and offset matrix, which I feed to scipy.ndimage.interpolate.affine_transform to recover the dst-aligned src image.
The problem is that, when the images are not fuly overlapping, the resultant image is cropped to only the common footprint of the two images. What I need is the full extent of both images, placed on the same pixel coordinate system. This question is almost a duplicate of this one - and the excellent answer and repository there provides this functionality for OpenCV transformations. I unfortunately need this for scipy's implementation.
Much too late, after repeatedly hitting a brick wall trying to translate the above question's answer to scipy, I came across this issue and subsequently followed to this question. The latter question did give some insight into the wonderful world of scipy's affine transformation, but I have as yet been unable to crack my particular needs.
The transformations from src to dst can have translations and rotation. I can get translations only working (an example is shown below) and I can get rotations only working (largely hacking around the below and taking inspiration from the use of the reshape argument in scipy.ndimage.interpolation.rotate). However, I am getting thoroughly lost combining the two. I have tried to calculate what should be the correct offset (see this question's answers again), but I can't get it working in all scenarios.
Translation-only working example of padded affine transformation, which follows largely this repo, explained in this answer:
...ANSWER
Answered 2022-Mar-22 at 16:44If you have two images that are similar (or the same) and you want to align them, you can do it using both functions rotate and shift :
QUESTION
I am using Perceptual hashing technique to find near-duplicate and exact-duplicate images. The code is working perfectly for finding exact-duplicate images. However, finding near-duplicate and slightly modified images seems to be difficult. As the difference score between their hashing is generally similar to the hashing difference of completely different random images.
To tackle this, I tried to reduce the pixelation of the near-duplicate images to 50x50 pixel and make them black/white, but I still don't have what I need (small difference score).
This is a sample of a near duplicate image pair:
Image 1 (a1.jpg):
Image 2 (b1.jpg):
The difference between the hashing score of these images is : 24
When pixeld (50x50 pixels), they look like this:
rs_a1.jpg
rs_b1.jpg
The hashing difference score of the pixeled images is even bigger! : 26
Below two more examples of near duplicate image pairs as requested by @ann zen:
Pair 1
Pair 2
The code I use to reduce the image size is this :
...ANSWER
Answered 2022-Mar-22 at 12:48Rather than using pixelisation to process the images before finding the difference/similarity between them, simply give them some blur using the cv2.GaussianBlur() method, and then use the cv2.matchTemplate() method to find the similarity between them:
QUESTION
Running Android Instrumented Tests, the gradle task :app:connectedDebugAndroidTest now prints a red WARNING after a successful test run:
ANSWER
Answered 2022-Mar-02 at 13:06Downgrading Gradle worked for me
QUESTION
I'm trying to test a Text that on my component I can print it in different colors, so on my test I'm verifying it gets the expected color. I was looking for a method to return the color but I did not find any.
From now I'm asserting that the text is correct and the visibility is correct, but when trying to find the method to get the colour I get too deep and I'm looking for a simpler solution.
...ANSWER
Answered 2022-Feb-11 at 09:02I am by no means a compose expert, but just looking at compose source code, you could utilize their GetTextLayoutResult accessibility semantic action. This will contain all the properties that are used to render the Text on a canvas.
Some quick and dirty extension functions I put up for convenience:
QUESTION
I have Android Studio BumbleBee 2021.1.1 downloaded, running on a MacBook Pro M1. When downloading Android Studio, I chose the Apple Chip option (opposed to Intel)
I've created a Virtual Device - Android 12.0 arm64-v8a Pixel 4.
When I attempt to run the emulator it gets stuck here
Then, it times out:
I have searched SO and other blogs and can only find outdated material based on a time in 2020/2021 when Android did not support ARM64. However, it's my understanding that this has now changed so https://github.com/google/android-emulator-m1-preview is no longer needed.
What is the correct way to run the Android Emulator on a Mac with an M1 Chip?
...ANSWER
Answered 2022-Jan-28 at 19:17I have found the issue so marking this as solved, however, if anyone knows why this solves the problem, please share!
I found an issue opened on Google's anroid-emulator-m1-preview repo with this answer https://github.com/google/android-emulator-m1-preview/issues/76#issuecomment-1023563846
Turns out, I just needed to uncheck 'Launch in a tool window' but again, not sure why that fixed the issue.
QUESTION
There are existing questions asking about labeling a single geom_abline() in ggplot2:
- R ggplot2: Labelling a horizontal line on the y axis with a numeric value
- R ggplot2: Labeling a horizontal line without associating the label with a series
- Add label to abline ggplot2 [duplicate]
None of these get at a use-case where I wanted to add multiple reference lines to a scatter plot, with the intent of allowing easy categorization of points within slope ranges. Here is a reproducible example of the plot:
...ANSWER
Answered 2022-Jan-17 at 21:55This was a good opportunity to check out the new geomtextpath, which looks really cool. It's got a bunch of geoms to place text along different types of paths, so you can project your labels onto the lines.
However, I couldn't figure out a good way to set the hjust parameter the way you wanted: the text is aligned based on the range of the plot rather than the path the text sits along. In this case, the default hjust = 0.5 means the labels are at x = 0.5 (because the x-range is 0 to 1; different range would have a different position). You can make some adjustments but I pretty quickly had labels leaving the range of the plot. If being in or around the middle is okay, then this is an option that looks pretty nice.
QUESTION
I don't know if this is possible, but I am trying to take the image of a custom outdoor football field layout and have the players' GPS coordinates correspond to the image xand y position. This way, it can be viewed via the app to show the players' current location on the field as a sort of live tracking.
I have also looked into this Convert GPS coordinates to coordinate plane. The problem is that I don't know if this would work and wanted to confirm beforehand. The image provided in the post was for indoor location, and it was from 11 years ago.
I used Location and Google Maps packages for flutter. The player's latitude and longitude correspond to the actual latitude and longitude that the simulator in the android studio shows when tested.
The layout in question and a close comparison to the result I am looking for.
Any help on this matter would be appreciated highly, and thanks in advance for all the help.
Edit:
After looking more at the matter I tried the answer of this post GPS Conversion - pixel coords to GPS coords, but it wasn't working as intended. I took some points on the image and the correspond coordinates, and followed the same logic that the answer used, but reversed it to give me the actual image X, Ypositions.
The formula that was given in the post above:
...ANSWER
Answered 2022-Jan-12 at 08:20First of All, Yes you can do this with high accuracy if the GPS coordinates are accurate.
Second, the main problem is rotation if the field are straight with lat lng lines this would be easy and straightforward (no bun intended).
The easy way is to convert coordinate to rotated image similar to the real field then rotated every X,Y point to the new straight image. (see the image below)
Here is how to rotate x,y knowing the angel:
QUESTION
I noticed one exception (Firebase Crashlytics) for Pixel 5 and Pixel 4a (both on Android 12), no other devices, happened only two times, one time for each device.
What does it mean? Android 11 and 12 have the same rules for working with foreground services, but there are no issues with Android 11. Is this a bug of Pixel?
From Firebase Crashlytics:
...ANSWER
Answered 2022-Jan-11 at 12:43Apps that target Android 12 (API level 31) or higher can't start foreground services while running in the background, except for a few special cases. If an app tries to start a foreground service while the app is running in the background, and the foreground service doesn't satisfy one of the exceptional cases, the system throws a ForegroundServiceStartNotAllowedException.
Exemptions from background start restrictions
In the following situations, your app can start foreground services even while your app is running in the background:
- Your app transitions from a user-visible state, such as an activity.
- Your app can start an activity from the background, except for the case where the app has an activity in the back stack of an existing task.
- Your app receives a high-priority message using Firebase Cloud Messaging.
- The user performs an action on a UI element related to your app. For example, they might interact with a bubble, notification, widget, or activity.
- Your app invokes an exact alarm to complete an action that the user requests.
- Your app is the device's current input method.
- Your app receives an event that's related to geofencing or activity recognition transition.
- After the device reboots and receives the ACTION_BOOT_COMPLETED, ACTION_LOCKED_BOOT_COMPLETED, or ACTION_MY_PACKAGE_REPLACED intent action in a broadcast receiver.
QUESTION
I have built a pixel classifier for images, and for each pixel in the image, I want to define to which pre-defined color cluster it belongs. It works, but at some 5 minutes per image, I think I am doing something unpythonic that can for sure be optimized.
How can we map the function directly over the list of lists?
...ANSWER
Answered 2021-Jul-23 at 07:41Just quick speedups:
- You can omit
math.sqrt() - Create dictionary of colors instead of a list (that way you don't have to search for the index each iteration)
- use
min()instead ofsorted()
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