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Hi everyone! I know something about coding (very basics stuff) and I'm new to PICO-8.
I'm doing some tests, one of this consist in highlighting an object when the user switch between two objects.
I need some kind of switch, like: when you press 4 the first time highlight X, the second time Y, the following times switch to the other.
This is the code, sorry for bad english:

 
rect1_x1=5 rect1_y1=120
rect1_x2=20 rect1_y2=110

rect2_x1=5 rect2_y1=5
rect2_x2=20 rect2_y2=15

sex1=-1 sey1=-1
sex2=-1 sey2=-1

function _init()
	cls()
end

function _update()
 cls()
 if btn(4) then
 	sex1=rect2_x1-1
 	sey1=rect2_y1-1
 	sex2=rect2_x2+1
 	sey2=rect2_y2+1
 elseif btn(4) then
 	sex1=rect1_x1-1
 	sey1=rect1_y1-1
 	sex2=rect1_x2+1
 	sey2=rect1_y2+1
  else end
end

function _draw()

	--background-----------
	rectfill(0,0,127,127,1)

	--select---------------
	rectfill(sex1,sey1,
										sex2,sey2,10)

 --1--------------------
	rectfill(rect1_x1,rect1_y1,
										rect1_x2,rect1_y2,8)

	--2--------------------
		rectfill(rect2_x1,rect2_y1,
										rect2_x2,rect2_y2,8)
end



You need to separate drawing and updating game state (and a game state to start with!)
Something like:

 
— game state
local switch_state=true
function _update()
  — note: using btnp to avoid auto-repeat
 if btnp(4) then
  switch_state=not switch_state
 end
end
function _draw()
 if switch_state then
  — draw for X
 else
  — draw rect for Y
 end
end


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