Calculating contrasting colours in javascript

On one of pages we're currently working on users can change the background of the text displayed. We would like to automatically alter the foreground colour to maintain reasonable contrast of the...

Nimbus Look&Feel refresh Painter

I'm using the Nimbus look & feel in my swing application. I set the primary and secondary properties of the UIDefaults of the look & feel. The colors are right. Now i have the problem, that the...

How to force QAbstractItemView recalculate items sizeHints

I have QListView and QTabWidget inside QSplitter. QListView is using custom model and custom delegates. In delegate I reimplemented paint and sizeHint methods. But when I resize view - height of...

How to rotate text for drawText?

I would like to rotate the text 45 degrees? QFont font; font.setPixelSize(12); //grid for(int i = 0; i < 10; i++){ painter->drawLine(100, 100 + i * 800/9, 900, 100 + i * 800/9); str =...

MySQL : ERROR 1215 (HY000): Cannot add foreign key constraint

I have read Database system concepts, 6th edition, Silberschatz. I'm going to implement the university database system shown in chapter 2 on OS X on MySQL. But I have a trouble with creating the...

Sequence contains more than one element?

Using ASP.NET MVC5 I'm getting this error: System.InvalidOperationException: Sequence contains more than one element at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source) ...

'QML Connections: Cannot assign to non-existent Property' despite the opposite being true

So, I checked the following questions, which seemed most similar to my existing...

Can access localhost but virtual host can't be reached

First post on stackoverflow, so thanks in advance for the help. I am having an issue connecting to my virtual host (created in WAMP), though I can access my localhost site with no issue. When I...

Flutter - How to rotate an image around the center with canvas

I am trying to implement a custom painter that can draw an image (scaled down version) on the canvas and the drawn image can be rotated and scaled. I get to know that to scale the image I have to...

PyQt5 QTableView selected cell background with Delegate

I have an application which uses a QTableView/QAbstractTableModel combination. For the view, I've defined a Delegate which displays an image (a QPixmap, loaded from an image file) in one column...

How to render an SVG without antialiasing in Qt/hook QPainter to avoid antialiasing?

I need to render a vector-only SVG without antialiasing in Qt; specifically, I don't want the resulting image to contain any color that was not exactly as specified in the source file. When...

How does delete works for QTimer

Although QTimer inherits QObject which we don't need to delete it manually, is that ok to put it in a method which will be called multiple time? void MainWindow::paintEvent(QPaintEvent *event) { ...

Flutter Custom Overlay

I am working on an app that requires a custom overlay that is positioned based on the click co-ordinates. The overlay should then fill the rest of the space from the position. The fill space...

Qt: moc Error 1: variable ' ' has initializer but incomplete type

I am new to Qt and Qml. For practicing QML Extensions with C++ , I built a qt project and hand-coded following the codes on ( https://doc.qt.io/qt-5/qtqml-tutorials-extending-qml-example.html# ),...

Value Selected in Select Menu Not Being Sent To the Server

(Backend developer trying to do some front end development here) I have a simple HTML form with some text field inputs and a select menu. When the form is submitted I see the text field values...

How to make a joystick in flutter where the inner circle doesnt leave the outer circle?

I am trying to create a joystick in flutter but I am not able to limit the inner circle inside the outer circle in a proper way,is there any suggestion for this?,Also is it possible for the outer...

How to add an image as a background with customPaint?

I have an app for painting using custom paint, and I wanted to add an image in the background so it can be painted over it but unfortunately I can't seem to figure out how to do that,I tried using...

How do I create tiered custom attribute select boxes with SnipCart?

I am looking to have two custom attributes for products, where the second custom attribute has unique options depending on the first attribute selected. My particular circumstance is selling art...

Json data Split in train and test

I am trying to fit CNN for huffpost news dataset https://www.kaggle.com/rmisra/news-category-dataset. The dataset i am using is in json format. my data format is this [{"category": "CRIME",...

jetPack compose Constraint layout issue

jetPack compose Constraint layout recomposes if vale of graphlayer (say alpha or any other property) changes. This shouldn't have been as graphic s layer is meant for animation...

Does jetpack compose use drawable-night folder?

We have a View based Android app with some drawables in res/drawable folder, and their counterpart for night mode in res/drawable-night folder When using legacy views, referencing a drawable...

How to resize image Component before image is loaded Android using Jetpack Compose?

I want to load images for posts (I am using LazyColumn) and determine the height of the post based on image and device width to scale it. code: Image( modifier = Modifier ...

Achieve this painterly compositing in Unity?

I've achieved this painterly effect in Blender via compositing but I need to know whether it's possible in Unity - after some google searches and going thru the Unity Asset Store I don't see...

Flutter custom shaped button widget

Hi, I'm converting a html/css design into a dart code to build this custom button-shaped widget. I think some skills in painter is required. Can anyone help?

Coil don't load image in emulator with Jetpack Compose

I need to show an image in my app by url using Coil, but this image don't load. I follow the official documentation https://coil-kt.github.io/coil/compose/. profile card implementation...

How to set an image URL as error placeholder on Coil in Jetpack Compose

Coil accepts a drawable resource as an error placeholder. Is there a way to use an image URL here instead? Here is the code I am working on: // Global variables var currentlySelectedImageUri =...

Flutter 2: Gradient Text with TextPainter breaking in Column

I am encouterring problem with my personal GradientText which is made to do not use ShaderMask. Here the device I use: I call it like that: Column( children: [ GradientText( 'Party...

Problem with Kotlin compose for desktop Window

I'm trying to make a chess engine desktop app with an ui component to it. The game() method that I mention is a simple while loop that allows me to ask for moves in algebraic notation and make the...

JetpackCompose Navigation Nested Graphs cause "ViewModelStore should be set before setGraph call" exception

I am trying to apply Jetpack Compose navigation into my application. My Screens: Login/Register screens and Bottom navbar screens(call, chat, settings). I already found out that the best way to do...

How does CustomPainter.shouldRepaint() work in Flutter?

In Flutter, when creating a CustomPainter, there is an override method, shouldRepaint() that you can return either true or false... presumably to tell the system whether or not to repaint the...