TMatrix | Terminal based replica of the digital rain from The Matrix | Command Line Interface library

I'm developing an animation application with 2D virtual camera. The camera viewport can be positioned and scaled in the keyframes and is then interpolated to render the final animation. I'm looking for the best way to interpolate the camera's parameters of x,y position, scale so that objects in the scene transformed by the camera change size at a constant rate and so that all objects travel in a straight line.

The transform matrix for rendering the scene from the point of view of the camera is calculate from the position and scale as follows, where DimX, DimY are the dimensions of the scene image, Pos and Scale are the position and scale of the camera (the variables that I want to interpolate).

Given is a blue line, which can be placed as pleased and is movable by mouse. By moving the line a gradient line (here in hotpink) is drawn from the original position. Now this line has the following requirements:

Assuming the left edge of the blue line being point 1 (red circle) and assuming the left edge of the original position of the blue line being point 2 (lime circle) assuming the right side of the blue line being point 3 (green circle) the angle from point 1 needs to be either 90 or -90 degress to point2/point3.

I believe the term for this is: the gradient hotpink line and the blue line are to be perpendicular. The direction of the blue line is not to change, only its position!

By moving the blue line I am able to calculate the degree to its original position and to draw the gradient hotpink line. Yet I am unable to calculate the closest point from the blue line which would make the gradient hotpink line perpendicular to both the original blue line and the new position of the blue line. If someone can point me to correct formula or proper term for this problem, I would be grateful.

Followed is a quick example which I scrapped together. One can move the blue line yet I can not force point 1 to keep a certain 90/-90 degree angle to point2/point3.

I want to validate the Qtablewidget input in each cell. How to accept only numeric value.For Example Like this QLineEdit widget. I am to the the PyQt5 GUI programming. I want to create a application to accept only numeric values and want to do further calculation.

I'm trying to get my VBA code to output a graph in excel based on an inputted range that was selected using a user defined function from multiple cells. I've passed the data to the sub as a range but it ends up assuming that the range is two data sets rather than one data set with x and y values. The data set is selected from excel into a function that is being written separately which then calls the sub.

Let's say for the sake of the example that we want to work on linear algebra, with different type of matrices. And that we have a custom Matrix class that implements :

I'm maintaining a Delphi 10.2.3 Isapi application that uses FMX.Graphics.TBitmap. Multiple threads are creating their own private bitmap, draw on it, return the binary content to the webrequest handler, and free the bitmap. While debugging access violations are occuring in this stack trace:

I have a banded matrix class, which inherits from a abstract matrix class

I have a Xmatrix of Row=12584 and Col 784. I want to extract each row based on another Tmatrix of Row=12584 Col 1 and append the values to numpy array X1 or X2. Even with smaller row size of 1500 it takes over 10 mins. I am sure there is better and efficient way to extract entire row and append to an array

We are adding a vignette to our R package. When documenting the package using roxygen2, the vignette breaks giving the error