Jittery Rotation When Altering Position

Solar2D General Questions/Discussion
#1 
for i=1,enemyGroup.numChildren do enemyGroup[i].x = enemyGroup[i].x + (enemyGroup[i].previousEnemyX - shipx) \* 0.3 enemyGroup[i].previousEnemyX = ships end

I run this code every frame to move my enemy ships in my game based on the movement of the player. I recently implemented the enemy ships “flying” on a bezier curve:

local function translate (object, vx, vy, time, ease) local t = 0 local curve = bezier:curve(vx, vy) local proxy = setmetatable({}, { \_\_index = function() return t end, \_\_newindex = function(\_, \_, v) t = v tempx, tempy = curve(t) object.rotation = angleBetween( object.x, object.y, tempx, tempy ) object.x, object.y = curve(t) end}) return transition.to(proxy, {t = 1, time = time, transition = ease}) end

with a transition.to call and use this code:

local function angleBetween( srcX, srcY, dstX, dstY ) local angle = ( math.deg( math.atan2( dstY-srcY, dstX-srcX ) )+90 ) return angle % 360 end

to make the ship face the direction it is flying.

The issue is that the enemy ships freak out and get all kinds of jittery rotation while they are both flying and I move the player’s ship. Does anyone know what might be going on here?

#2

EDIT: I figured out my issue, the bezier movement is hard coded to exact pixels, so the jittering I am seeing is just the ships trying to fight that motion.

#3

Could anyone suggest how to dynamically change the value of the bezier curve along with the ship movement?

#4

EDIT: I figured out my issue, the bezier movement is hard coded to exact pixels, so the jittering I am seeing is just the ships trying to fight that motion.

#5

Could anyone suggest how to dynamically change the value of the bezier curve along with the ship movement?