drawing | Real-time collaborative drawing using node.js , paper.js | Websocket library

I am trying to remove horizontal lines from my daughter's drawings, but can't get it quite right.

The approach I am following is creating a mask with horizontal lines (https://stackoverflow.com/a/57410471/1873521) and then removing that mask from the original (https://docs.opencv.org/3.3.1/df/d3d/tutorial_py_inpainting.html).

As you can see in the pics below, this only partially removes the horizontal lines, and also creates a few distortions, as some of the original drawing horizontal-ish lines also end up in the mask.

Any help improving this approach would be greatly appreciated!

From https://stackoverflow.com/a/57410471/1873521

I have something like:

I'm trying to learn Python/Pygame and I made a simple Pong game. However I cannot get the square to bounce off the sides at the perfect pixel as the drawing of the square is updating let's say 3 pixels every frame.

I have a code to decide when the square is hitting the edges and bounce in a reverse direction like this:

I'm making a Theremin-like app in Unity (C#).

I have horizontal Axis X, on which I can click (with a mouse or with a finger on a smartphone). This X-axis determines the frequency, which will be played. The user will specify the frequency range of the board (X-Axis), let's say from frequency 261.63 (note C4) to 523.25 (note C5).

I'll calculate x_position_ratio which is a number between 0 and 1 determining, where did the user click on the X-axis (0 being on the most left (note C4 in this example), 1 on the most right (note C5))

From this, I will calculate the frequency to play by equation

So I have a c# class library project that I only intend to use on windows. It contains some classes that use the System.Drawing.Image class which is only available on windows. After upgrading to VS2022 and setting the target framework to .NET 6.0 I'm seeing a bunch of warnings that say CA1416 "This call site is reachable on all platforms. 'SomeClass.SomeMethod' is only supported on: 'windows'. See screenshot below for some examples:

In some sense, it's cool that VS2022 has scanned the library and found all the platform specific code that I'm using in the library. But I'd like to tell VS that I only plan to use the library on windows and it can mute all those warnings.

First I checked the Target Platform options in the properties of the project but didn't seen any windows specific targets.

Then I decided to edit the project's .csproj directly and changed the Target framework from

net6.0
to
net6.0-windows

But sadly even after a recompile, that didn't make the warnings go away either. So then I did some reading on the CA1416 warnings and sure enough it says in the Microsoft Docs that the TFM is ignored for assessing this warning however VS does add an attribute to the project based on the TFM that influences this warning, but it only does so if the project is configured to generate the AssemblyInfo.cs file on the fly. But alas, my project's AssemblyInfo.cs is maintained as a actual file rather then having it auto generated at build time.

So at this point, I'm ready to punt the ball and just disable CA1416 warnings for my project. So in the project's .proj file I added CA1416 for both the release and debug builds like so:

One would think that would be the end of those pesky warnings. (sigh) As it turns out, after rebuilding the project the warnings still show up. Got any suggestions? I'm all ears.

According to https://docs.microsoft.com/en-us/dotnet/core/compatibility/core-libraries/6.0/system-drawing-common-windows-only System.Drawing.Common is no longer supported under on non-windows OS UNLESS a runtime configuration switch is set. I've setup runtimeconfig.template.json and see the switch:

I'm building a Visual Studio extension, which should add my tool button on a ToolBar or ToolStrip.

There are 2 cases:

• first case, add my red button to the toolbar/toolstrip which was added by another extension (Visual Micro), see image 1.

• second case, add my red button to the Properties toolbar/toolstrip of the Visual Studio UI, see image 2.

Image 1:

Image 2:

I tried to implement the second case, but without any positive results.

Here is the code:

I am working on a simple whiteboard application where the drawings are represented by quadratic Bezier curves (using the JavaScript's CanvasPath.quadraticCurveTo function). I am trying to implement functionality so that an eraser tool or a selection tool are able to determine if they are touching a drawing.

To show what I'm talking about, in the following image is a red drawing and I need to be able to determine that the black rectangles and black point overlap with the area of the drawing. For debugging purposes I have added blue circles which are control points of the curve and the green line which is the same Bezier curve but with a much smaller width.

I have included my code which generates the Bezier curve:

I have a game written using SDL2, and the SDL2 renderer (hardware accelerated) for drawing. Is there a trick to draw filled quads or triangles?

At the moment I'm filling them by just drawing lots of lines (SDL_Drawlines), but the performance stinks.

I don't want to go into OpenGL.