particles working a bit

1 files changed, 55 insertions, 16 deletions

diff --git a/src/objs/specks.lua b/src/objs/specks.lua
index a01e233..34bc342 100644
--- a/src/objs/specks.lua
+++ b/src/objs/specks.lua
@@ -1,7 +1,7 @@
 Speck_Sys = {}
 Speck_Sys.__index = Speck_Sys
 
-function Speck_Sys.new(texture)
+function Speck_Sys.new()
   local self = setmetatable({}, Speck_Sys)
 
   self.data = {
@@ -17,25 +17,49 @@ function Speck_Sys.new(texture)
   }
 
   self.scale_curve = lerp
-  self.scale_min = 1
-  self.scale_max = 1
+  self.scale_start_min = 1
+  self.scale_start_max = 1
 
-  self.scale_end_min = 1
-  self.scale_end_max = 1
+  self.scale_end_min = 0
+  self.scale_end_max = 0
 
-  self.texture = texture
+  self.lifetime_min = 1
+  self.lifetime_max = 5
+
+  self.interval = 0.1
+  self.spawn_timer = self.interval
+
+  self.texture = get_tex("res/img/speck.png")
 
   self.x = 0
   self.y = 0
+  return self
 end
 
-function Speck_Sys:process(dt)
+function Speck_Sys:update(dt)
   local data = self.data
 
+  self.spawn_timer = self.spawn_timer - dt
+  if self.spawn_timer <= 0 then
+    self.spawn_timer = self.interval
+
+    data.size = data.size + 1
+    data.pos[data.size] = { x = self.x, y = self.y }
+    data.vel[data.size] = { x = 0, y = 0 }
+
+    data.lifetime[data.size] = lmath.random(
+      self.lifetime_min, self.lifetime_max)
+    data.lifetime_max[data.size] = data.lifetime[data.size]
+
+    data.scale_start[data.size] = lmath.random(
+      self.scale_start_min, self.scale_start_max)
+    data.scale_end[data.size] = lmath.random(
+      self.scale_end_min, self.scale_end_max)
+  end
+
   for i = 1, data.size do
-    -- dead particles skip
     if data.lifetime[i] <= 0 then
-      goto next_speck_process
+      goto next_speck_update
     end
 
     data.pos[i].x = data.pos[i].x + data.vel[i].x * dt
@@ -43,7 +67,7 @@ function Speck_Sys:process(dt)
 
     data.lifetime[i] = data.lifetime[i] - dt
 
-    ::next_speck_process::
+    ::next_speck_update::
   end
 end
 
@@ -52,16 +76,31 @@ function Speck_Sys:draw()
   local data = self.data
 
   for i = 1, data.size do
-    local anim = data.lifetime[i] / data.lifetime_max[i]
-    local scale = scale_curve(self.scale_start, self.scale_end, anim)
+    if data.lifetime[i] <= 0 then
+      goto next_speck_draw
+    end
+
+    local anim = 1 - data.lifetime[i] / data.lifetime_max[i]
+    local scale = scale_curve(data.scale_start[i], data.scale_end[i], anim)
 
     lg.draw(
-      self.texture, data.pos[i].x, data.pos[i].y
+      self.texture, data.pos[i].x, data.pos[i].y, 0, scale
     )
+    ::next_speck_draw::
   end
 end
 
-register_comp("Specks", function (ent)
-  ent.specks = Speck_Sys.new("res/img/speck.png")
-
+register_comp("Speck_System", function(ent)
+  ent.speck_sys = Speck_Sys.new()
 end)
+
+function speck_update_sys(ent, dt)
+  ent.speck_sys.x = ent.x
+  ent.speck_sys.y = ent.y
+
+  ent.speck_sys:update(dt)
+end
+
+function speck_draw_sys(ent)
+  ent.speck_sys:draw()
+end