A simple example of top down movement using trigonometry for accurate spacing on the diagonal.
I can't do much about the jittery diagonal control, this is due to it being low resolution pixel perfect movement.
This idea for this upload is to help people have a simple base without relying on the xx/yy method which doesn't take into account pythagoras theorem.
Do with it as you wish, I would love to see it smoothed out without being too complicated to understand.
- Imp
Remember to change to _update60() if you prefer.
Change Notes:
V1.2 Released:
Replaced True/False with 1/_
V1.1 Released:
Now even more compact with a shorter method.
Hi, @imprimis. I know this post is 3yo already but I really liked your demo here, specially because you cared for keeping speed consistent in diagonal movement. Unfortunately it also puts fractional coordinates into the equation, which causes jittering.
I made a demo myself where I believe this is solved: https://www.lexaloffle.com/bbs/?tid=38130
The way I solved it was based on a tip that user @ianh posted here:
"To fix it, you could try rounding the x and y coordinates any time you're not moving. Then you always start from a whole number, and the rounding cutoffs are at the same place for both coordinates."
So, I wrote a basic round function:
function round(n)
return (n%1<0.5) and flr(n) or ceil(n)
end |
As the diagonal movement is 45º, the fractional parts that are accumulated for horizontal and vertical movement are basically the same, but only if you always round x and y when you stop or change direction. Finally, the sprite is always drawn to the rounded values of x and y.
This took me a few days but I am still learning PICO-8 and Lua. Please, let me know if you think there could be any improvements on my code.
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