Did you have a look at the demos/collide sample that ships with pico8?
Is that what you are trying to achieve?
1
Super simple example:
function _init()
x,y=0,0 -- actual sprite position
new_x,new_y=0,0 -- position to move sprite to
end
function _update()
if btnp(1) then -- 1 == right
new_x+=8
end
if new_x>x then
x+=1 -- moves one pixel per frame
end
end
function _draw()
cls()
spr(1,x,y)
end
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For more directions than one, make more if tests, or perhaps a lookup table with btnp() mask values to see where you want to move based on them. You'll need to make sure you can't change direction midways in a move, because then it won't keep to the grid anymore.
1
I posted a couple carts on doing this. Hope they help...
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