Circles | UNSW degree planner

In d3, we may change the order of elements in a selection, for example by using raise.

Yet, when we rebind the data and use join, this order is discarded.

This does not happen when we use "the old way" of binding data, using enter and merge.

See following fiddle where you can click a circle (for example the blue one) to bring it to front. When you click "redraw", the circles go back to their original z-ordering when using join, but not when using enter and merge.

Can I achive that the circles keep their z-ordering and still use join?

On a website I'm creating there is a cursor that needs to change its color smoothly.
When it is on a white background the cursor needs to be the blue #0059ff (this is important and I will explain why later on) and when it is on blue then the cursor needs to be white; and the transition needs to be smooth like so:

To get the white color with mix-blend-mode I'm calculating the inverted color using adjust-hue($color, 180) (in SCSS) and applying this color to the cursor.

When the background color is #0000ff then cursor should be #ffff00.

I have started a prototype using mix-blend-mode: difference that works on "primary colors" (basically colors like #ff0000, #ff00ff and so on).
Result:

Problems begin when I try to change the "primary" blue #0000ff to the one needed by the project #0059ff. The inverted color is calculated to be #ffa600 and the result is, let's say, "unsatisfactory" because I want the cursor to be white on some background color and said color on white background.

Calculating the difference will not work with this color and I have no idea how to make it so that when the cursor is not over the white background then the cursor becomes blue (-ish) and when it's over the blue background it becomes white.

My whole code so far:
(SCSS compiled so it can run in StackSnippet)

Suppose I have n circles of radius r. I want to place them randomly inside a rectangle of size AxA.

It is guaranteed that they fit. One can suppose that the sum of the area of all circles is about 60% of the area of the rectangle.

I can try it by doing a backtracking, trying to place, going back, etc., but there should be a better way to do it.

I need to create circles in canvas using fabric. Every click, there is a circle created. However, if the new circle created it will replace old circle. This my stackblitz demo.

HTML

I borrowed the R code from the link and produced the following graph:

Using the same idea, I tried with my data as follows:

Without using ggplot2 or other plotting libraries, I would need to draw circles around a polygon/star chart vertices, i.e. each circle with a radius equal to the respective polygon radius. You can see an example here:

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 had a BadgeView written with View using onMeasure, onLayout and OnDraw

I'm trying to migrate this View to Jetpack Compose.

Since drawing shapes is easier with compose i thought there is no need to use canvas or Layout functions at all, but size of Text or Surface wrapping it is not set properly before text size is calculated, and circle is not drawn properly.

Also checked out Badge component, it uses static sizes BadgeWithContentRadius, since in my design size depends on text size it's not possible to set a static size.

Is there a way to display divs in a staggered vertical arrangement like this image?

So far I have used Flexbox to get close but can't stagger the rows because I don't want to pre-determine how many circles are in each row, I want the user's browser width to control how many circles are per row (hence no classes or childs on the circle divs).

As the user's browser gets narrower, I want the circles to respond so that in a mobile size they would become 1 long single column.

Here is a Fiddle to show the code so far. I'd be open to JQuery if needed. Thank you for any help.