update todo list

todo.md

@@ -1,8 +1,8 @@
 ## 1. refine existing engine (knowing what I know now)
 
-- [ ] rewrite event queue as a linked list
+- [x] rewrite event queue as a linked list
-- [ ] rewrite animator stacks as linked lists
+- [x] rewrite animator stacks as linked lists
-- [ ] rewrite ship/bullet collections as linked lists
+- [x] rewrite ship/bullet collections as linked lists
 - [ ] update/draw mode switching system (high-efficiency version)
 - [ ] render ship shields (even for large ships)
 - [ ] duplicate file -- about to split away from Tyrian features

updatedshmup.p8

@@ -1789,21 +1789,10 @@ function boom(x,y,boominess,is_boss)
  return
 end
 
-function spark(sprs, x, y, butts, thrust, odds, fg)
+spark_particle={}
- if (sprs==nil or flr(rnd(odds)) ~= 0) return
+mknew(spark_particle)
- thrust *= 2.5
+
- local target = fg and intangibles_fg or intangibles_bg
+function spark_particle:move()
- target:push_back{
-  x = x + rnd(4) - 2,
-  y = y + rnd(4) - 2,
-  sprs = sprs,
-  sidx = 1,
-  dx = (butts[0] - butts[1]) * thrust + rnd(2) - 1,
-  dy = (butts[2] - butts[3]) * thrust + rnd(2) - 1,
-  draw = function(self)
-   pset(self.x, self.y, self.sprs[self.sidx])
-  end,
-  move = function(self)
  if (rnd(4) < 1) self.sidx += 1
  if (self.sidx > #self.sprs) return true
  self.x += self.dx
@@ -1811,7 +1800,22 @@ function spark(sprs, x, y, butts, thrust, odds, fg)
  self.dx -= mid(0.05,-0.05, self.dx)
  self.dy -= mid(0.05,-0.05, self.dy)
 end
- }
+function spark_particle:draw()
+ pset(self.x,self.y,self.sprs[self.sidx])
+end
+
+function spark(sprs, x, y, butts, thrust, odds, fg)
+ if (sprs==nil or flr(rnd(odds)) ~= 0) return
+ thrust *= 2.5
+ local target = fg and intangibles_fg or intangibles_bg
+ target:push_back(spark_particle.new{
+  x = x + rnd(4) - 2,
+  y = y + rnd(4) - 2,
+  sprs = sprs,
+  sidx = 1,
+  dx = (butts[0] - butts[1]) * thrust + rnd(2) - 1,
+  dy = (butts[2] - butts[3]) * thrust + rnd(2) - 1,
+ })
 end
 -->8
 -- powerups