LightLevel | Tiny Bukkit plugin that displays light level | Game Engine library

I have a room with a light that has 4 levels – off, low, medium, high ...

The level changes each time you press a button.

How could I make the body colour on the page change in relation to the changes in state?

I have a simple question, but I wasn't able to find an answer to this. Note, that I'm almost a complete beginner.

So I have an app (it's not mine, but I'm contributing to it), and in there is writing on a color background, which can be changed by the user. The writing should appear black if the background is bright enough but stay white if it isn't.

The application is a school diary app for elementary and high-school students that connects to the state-wide school diary service in Hungary. Here, the best note is 5, the worst is 1. The user can set the colors of each grade in the settings. Right now, only the code for the note "4" is hard-coded to have black text (because the background is yellow by default on "4" notes), all others have white. This is what I want to automate.

Example of white text

Example of black text

This is the main screen of the app for reference

Page where user can change color for a kind of note

Code right now:

I've made a lighting engine which allows for shadows. It works on a grid system where each pixel has a light value stored as an integer in an array. Here is a demonstration of what it looks like:

The shadow and the actual pixel coloring works fine. The only problem is the unlit pixels further out in the circle, which for some reason makes a very interesting pattern(you may need to zoom into the image to see it). Here is the code which draws the light.

I'm using Microsoft.EntityFrameworkCore.SqlServer v2.1.2 (and have also tried v2.2.0-preview1-35029) and am using LINQ to fetch a collection of entities from an Azure SqlServer database, filtering on a DateTime field.

However, the SQL generated by the LINQ statement uses a string-based DateTime value that SqlServer rejects with this error:

Conversion failed when converting date and/or time from character string.

I can modify the SQL statement to change the datetime format so that the query works without error (see below for details), but I don't know how to get the framework to generate that same datetime format.

While EntityFrameworkCore is still kinda new, it seems like this is a pretty straightforward use case, so I'm assuming I'm doing something wrong and that it's not a framework issue.

How do I prevent EF from generating an invalid datetime value in the SQL?

and/or

How do I get the generated SQL to use another format for DateTime objects?

The EntityFramework model I'm using looks like this:

So I started using an Arduino kit I bought recently, and have been attempting to make a motor move (for now) before I go onto more complex things.

The point of my little project in the future will be for the Arduino to sense light from near my window at night. From there it will hopefully turn a motor that hits my alarm clock. Though for now I simply want to get the motor moving when it sees light, and off once it stops seeing light, as I can add an automatic turn off after a few seconds later.

Here is the current code:

I saw the same topic/question in various posts here, but none seem to be what i am searching for. I have 2 identical tables in a database, and i want to populate them in an identical way, with two identical methods, they only have different data storing. The first method EnterParams works fine & populates the table, but the second one fails. Tried debugging the code line by line and when it goes to com.ExecuteNonQuery() it catches an exception (In my controller i have a try/catch method) and it stops.

How can i know what exception it is and how to handle it? It is weird because both methods are identical, one succeeds and one fails

I'm struggling to deserialzer the JSON snippet below due to the different fields being returned, for example in config, it works ok with config.on, as this is in each config block, but as they others are all different, how do I get round this? The JSON returns all the different sensors connected so with different fields.

I need help with organizing shaders in my game.

The game uses vertex and pixel shaders for texturing and lighting. Some objects are textured, other just colored, then there are several lighting algorithms - lightmaps, diffuse and specular lighting, some shadow generation which only some objects get, etc.

My first idea was to have one big, nice shader technique which can handle it all based on parameters. This was great to maintain (pseudo code to give idea):