As you can read here black bars are normal with letterbox integer scale.

Using another scaling option it can be avoided, because you don't limit the scaling.

Probably you dont want other scaling because of pixel-art, if so, your "problem" can't be solved.

sounds like you are looking for the function object. Just code once and repeat with different parameters.

Just add the images you'd like at the sides of your playing field. The dotted line in the editor window.

I'm guessing you are using scale outer, so the images will appear when the window is wider than your project size.

From the manual:

Form controls are actual HTML elements floating above the game canvas in the HTML page. Therefore, nothing can be displayed on top of a form control, apart from other form controls.

wouldn't using the curve feature in the canvas plugin be easier?

system compare two values - normal height > sprite.height

-- Sprite set height to sprite.height+1

system compare two values - normal width > sprite.width

-- Sprite set width to sprite.width+1

Every tick 1 is added to width and height.

This stops when normal size is reached.

should work with square sprites

Ofcourse you should define the values for normal width and normal height

How to make a configurable slider

That's all about picking the right instances.

Some of it will depend oh how you let the user do the selecting.

After the user has selected the instances you could use the system pick instances actions to only perform actions on the selected instances.

There are many ways to go about the selecting. you could use instance variables. Somteimes creating a sprite to show an object is selected can be used in overlapping comparison.

So when you have found a way to identify the selected objects/instances, that can be used for the system to pick them and only perform actions on them.

physics behaviour create joint?

I think it is necessary to see your capx to answer your question.

Could be you have conflicting events, your set-vector is triggered the wrong way and probably some other things I can't think of right now.

I've never played Little Big Planet, so I haven't got an idea of what this welding tool is supposed to do, could you explain it?

My attempt to create a point&click adventure with C2:

Leaving Nic's Vegas

Never finished this and it was made when I knew a lot less about programming with construct2. Hope to someday get back to it if time permits.