Add Effects extension

[Xeltalliv]

Example of using those blocks:

Adds 2 effects:

• Clipping, which only shows parts of sprite inside of the clipping area.
• Additive blending

Those effects are cleared after stopping the project. They affect stamps, but don't affect pen. Touching blocks work as if those effects don't exist. They are disabled for stage.

[True-Fantom]

It might need a better name.

Perhaps just "effects" would have been better. Or "shaders"

[True-Fantom]

It may be worth adding these blocks:

• (clipping box x1)
• (clipping box y1)
• (clipping box x2)
• (clipping box y2)
• <additive blending on?>

[True-Fantom]

finished images (#204)

[True-Fantom]

@Xeltalliv By the way, maybe add #177 effects in the future?

[Xeltalliv]

@Xeltalliv By the way, maybe add #177 effects in the future?

In terms of code, it makes more sense to make that a separate extension. I might eventually make it. Or someone else might make it. And for this reason, calling this extension "Effects" may be slightly problematic.

[True-Fantom]

@Xeltalliv Well, in fact, all these are the effects of displaying sprites. It would not be very convenient to divide them into "Color effects" and "Something effects"

Perhaps "Render" is good alternative

[True-Fantom]

@Xeltalliv I edited the code a bit:

• added icon
• renamed class from Extension to Effects
• replaced (function(Scratch) { with (Scratch => {
• moved width and height to beginning of menu
• renamed min x, min y, max x and max y to x1, y1, x2 and y2 for convenience
• removed unnecessary empty lines
• add some empty lines

Here is it

[Xeltalliv]

Perhaps "Render" is good alternative

I don't think that's a better name. I think I'll keep it named "Effects".

(Also, there's no need to mention me. I made this PR, so I'm automatically subscribed to all activity in it. I'm also Watching this repository, so I actually get notified about everything)

[True-Fantom]

Also, there's no need to mention me

Ok

I changed name back and once again modified code

[True-Fantom]

Do you agree with changes?

[Xeltalliv]

Do you agree with changes?

• added icon

• moved width and height to beginning of menu

Yes

• renamed class from Extension to Effects

Keeping class named just Extension allows changing name of the extension more easily. I've recently switched to doing that in every new extension I make.

• renamed min x, min y, max x and max y to x1, y1, x2 and y2 for convenience

There is a reason why it was called that way.
People might not expect this:

But this is immediately clear:

• replaced (function(Scratch) { with (Scratch => {
• removed unnecessary empty lines
• add some empty lines

It was formatted in the way I prefer. Double/more empty lines are used to more visibly separate distinct sections of code. Trailing commas in "blocks" and "menus" were also intentional.

[TheShovel]

Maybe rename this extension to Clipping if you are not planning on adding other effects.

[True-Fantom]

Okay)

I asked and offered everything I wanted. You made excellent extension! Good luck in the future)

[Xeltalliv]

Note to GarboMuffin: this extension modifies gl state, but doesn't fully restore it at the end. Despite that it seems to work. I'm not sure if it's better to keep it as is, or make it intercept, save and then restore everything which will add extra overhead, but potentially improve compatibility.

[GarboMuffin]

This seems like another case where a documentation page could be beneficial

I'll fix the merge conflicts and merge this in a bit, such a documentation page can be added later if you want to

[WojtekCodesToday]

ok