trignometric visualizer

[sfederici]

Scratch Project URL

https://scratch.mit.edu/projects/927737037

Leopard Project URL

https://leopardjs.com/projects/37tFt1S4te

What kind of error(s) are you experiencing?

• Leopard is failing to generate JavaScript code
• The JavaScript code generated by Leopard doesn't work correctly
• The JavaScript code generated by Leopard is confusing or needs improvement
• Other

Description of issue(s)

The background in the Leopard translation is white, not black. So the white text is not visible

[PullJosh]

I can't access your Leopard project because it isn't shared. When I tried converting the project myself (just now) the background appears to be black, correctly.

However, the text is still not visible.

[PullJosh]

Not to pat ourselves on the back, but I'm quite pleased that this hacked block in the project translated seemingly-correctly:

[PullJosh]

Well, nearly, anyway. It turns out that within the Function Buttons sprite there is the following custom block:

Notice that this block runs the above block within a "for each" loop, creating two nested "for each" loops that both use the same variable, i. The problem is that the inner loop mutates i and prevents the outer loop from running the same way that Scratch does. (In Scratch, the loops do not interfere with each other at all.)

This is a pretty esoteric issue. We could try to fix it in Leopard, but I don't think it's a high priority since this is a hacked block. Rewriting these loops to use non-hacked blocks (or changing the JS for loops to use a local variable rather than global) fixes the issue.

[PullJosh]

Aha! 🔍🕵️ There's one more Leopard bug that is causing issues. In Scratch, a hidden sprite (that used the "hide" block) will still appear when using the "stamp" pen block. In Leopard, using "stamp" with a hidden sprite doesn't work.

This particular project can be fixed by showing the sprite:

But of course we should fix this behavior in general (leopard-js/leopard#205).

Fixed version of this project: https://leopardjs.com/projects/VFLg_A0nge

[sfederici]

I'm reopening as, in the [r,-r] graph, the dots are red in Scratch but they are black in Leopard