SpiralS | /// ///// // // Platform Adaptation of DSP Algorithms

This is due to an indentation error:

I am not sure about what you want to do exactly.

Let say your have a JSON data file accessible by a simple GET request (as it seems to be) and want to convert it into an XML file using PHP.

First, you can convert your json to array with json_decode. Then, you can SimpleXML extension to generate an XML output.

As an example:

I was able to create a solution. I wanted to animate an element along a path, but the element doesn't start exactly where the path begins. In my example the path starts on the top-middle side of the container, but the element is closer to the top-left side of the container. This moves an element toward the top-middle side, then starts the animation along the path once the element reaches it.

The code could be adapted to other similar situations. I'm sure there are better ways but I've gone through the GSAP and anime.js libraries and couldn't find a way to do it without the Flip plug-in from GSAP which is under the paid license.

The reason is that you update the boundary variables (top, left, right, bottom) with a step of two at a moment that you still need to fill one cell that is outside that box when you start with your next direction (which is why you do two blankGrid assignments in each iteration of the inner loops -- which looks strange). This is no problem as long as the while condition is true, but in the last phase that condition will be false, meaning that the "box" has narrowed to nothing. Yet there is still this one cell to place...

One solution is to not change that boundary with 2, but just 1, and do the other increment/decrement when you start with in the next direction.

Your loop body could be updated with this idea as follows:

If you're trying to make a grid of spirals it looks like you just need to use a pair of for loops where you currently have for (let j = 0; j < 5; j++) {. Pretty much any time you want to create a grid you're going to want a pair of nested for loops.

You could do it by using a global flag variable and installing a turtle timer that calls a function that periodically checks to see whether a spiral has finished being drawn yet by looking at the variable — and if so, resets things and draws another one. In the code below the function that does that is named check_status(). I also added a short pause before the after each one is finished to allow it to remain visible long enough to be admired. ;¬)

If I manipulate Light/Dark Theme Toggle

I get this

You are right with your assumption. The problem lies with the tangential force.

But there are two problems with the way you calculate your tangential force:

1. What you mentioned, that the force should apply instantaneously.
2. The way you calculate your force, the center of rotation changes throughout the simulation.

Both of those can be fixed by decreasing the timestep and increasing the number of iterations, but those are hardware bound, so you will eventually hit the bottom there.

A better way to fix those problems is by using a different model:

Using a conservative force(examples of that are gravity, electrostatic forces, Forces from a rope that connects your object and the center, …) allows the system to correct itself if it starts spiraling(If your object leaves the desired radius, conservative forces will make sure it comes back).

Here an example implementation for gravity:

I have found it after digging deeper in the debugger.

At the moment before adding li.nextIndex() == 5 and li.previousIndex() == 4 After adding the object the aforementioned change to li.nextIndex() == 6 and li.previousIndex() == 5 this is because listIterator's .add() inserts the object before .next().

Moving ahead with this problem sets up a back and forth loop where li.previous() decreases both li.previousIndex() and li.nextIndex() by 1, and calling li.add(emp_M) increases both aforementioned values by 1.

To fix it, we need to skip the added element after adding: