speck rotation

2 files changed, 22 insertions, 1 deletions

diff --git a/src/scenes/speck_editor.lua b/src/scenes/speck_editor.lua
index 8ed4df9..2598c34 100644
--- a/src/scenes/speck_editor.lua
+++ b/src/scenes/speck_editor.lua
@@ -23,6 +23,10 @@ local PROPERTY_CUSTOM = {
   spread           = { min = 0, max = 360 },
   lifetime_min     = { min = 0, max = 32 },
   lifetime_max     = { min = 0, max = 32 },
+  angle_min     = { min = -360, max = 360 },
+  angle_max     = { min = -360, max = 360 },
+  angle_vel_min     = { min = -720, max = 720 },
+  angle_vel_max     = { min = -720, max = 720 },
   interval         = { min = 0, max = 32, step = 0.01 },
   texture_path     = { is_file = true, directory = "res/img/" },
   gradient         = { is_file = true, directory = "res/img/" },
diff --git a/src/specks.lua b/src/specks.lua
index faaa69b..3cc4221 100644
--- a/src/specks.lua
+++ b/src/specks.lua
@@ -33,6 +33,9 @@ function Speck_Sys.new()
     lifetime = {},
     lifetime_max = {},
 
+    angle = {},
+    angle_vel = {},
+
     scale_start = {},
     scale_end = {}
   }
@@ -71,6 +74,11 @@ function Speck_Sys.new()
 
   self.interval = 0.1
 
+  self.angle_min = 0
+  self.angle_max = 0
+  self.angle_vel_min = 0
+  self.angle_vel_max = 0
+
   self.texture_path = "res/img/speck.png"
 
   self.x = 0
@@ -100,6 +108,10 @@ SPECK_EXPORTED_ARGS = {
   "initial_velx_max",
   "initial_vely_min",
   "initial_vely_max",
+  "angle_vel_min",
+  "angle_vel_max",
+  "angle_min",
+  "angle_max",
   "damping",
   "spread",
   "lifetime_min",
@@ -152,6 +164,9 @@ function Speck_Sys:spawn_particles()
       y = randf_range(self.initial_vely_min, self.initial_vely_max),
     }
 
+    data.angle[id] = randf_range(self.angle_min, self.angle_max)
+    data.angle_vel[id] = randf_range(self.angle_vel_min, self.angle_vel_max)
+
     local beta = self.spread * math.pi / 180
     beta = beta / 2
     beta = randf_range(-beta, beta)
@@ -209,6 +224,8 @@ function Speck_Sys:update(dt)
     data.vel[i].x = data.vel[i].x + (dampx + self.forcex) * dt
     data.vel[i].y = data.vel[i].y + (dampy + self.forcey) * dt
 
+    data.angle[i] = data.angle[i] + data.angle_vel[i] * dt
+
     -- move and bounce
     data.pos[i].x = data.pos[i].x + data.vel[i].x * dt
     if self:check_bounce(i) then
@@ -253,7 +270,7 @@ function Speck_Sys:draw()
     lg.setColor(gradient:getPixel(sample_pos, 0.5))
 
     lg.draw(
-      tex, data.pos[i].x, data.pos[i].y, 0, scale, scale, w / 2, h / 2
+      tex, data.pos[i].x, data.pos[i].y, math.rad(data.angle[i]), scale, scale, w / 2, h / 2
     )
     lg.setColor(1, 1, 1, 1)
     ::next_speck_draw::