add acceleration to player

data/scripts/classes/feed.lua

@@ -1,5 +1,4 @@
 local Vector3 = require "types.vector3"
-local util    = require "util"
 
 local TEXTURE = "images/tongue.png"
 

data/scripts/classes/player.lua

@@ -1,5 +1,4 @@
 local Vector3 = require("types.vector3")
-local util = require("util")
 local Signal = require("types.signal")
 
 local Player = {
@@ -12,6 +11,8 @@ local Player = {
   yaw = 0,
   yaw_speed = 0.05,
   
+  accel = 0.3,
+
   ThrowPressed = Signal.new(),
 }
 
@@ -21,7 +22,7 @@ function Player:tick(ctx)
   input_action{name = "forward", control = "W"}
   input_action{name = "back", control = "S"}
 
-  input_action{name = "throw", control = "SPACE"}
+  input_action{name = "throw", control = "LCLICK"}
 
   local camera_forward = Vector3(draw_camera_from_principal_axes(self).direction)
   camera_forward.y = 0
@@ -32,7 +33,9 @@ function Player:tick(ctx)
   local strafe_input = util.b2n(input_action_pressed{name = "right"}) - util.b2n(input_action_pressed{name = "left"})
 
   local direction = ((camera_forward * forward_input) + (camera_right * strafe_input)):normalized()
-  self.velocity = direction * self.speed
+  local target_vel = direction * self.speed
+  self.velocity = self.velocity:lerp(target_vel, self.accel)
+  -- self.velocity = target_vel
 
   if input_action_just_pressed{name = "throw"} then
     self.ThrowPressed:emit(self.position:copy(), camera_forward:copy())

data/scripts/game.lua

@@ -1,8 +1,8 @@
+util = require "util"
 local player = require "classes.player"
-local util = require "util"
 local Vector3 = require "types.vector3"
-local Feed = require "classes.feed"
 
+local Feed = require "classes.feed"
 local feed = {}
 
 local function create_feed(position, direction)

data/scripts/types/signal.lua

@@ -3,8 +3,6 @@ local Signal = {
   _connections = {}
 }
 
-local util = require "util"
-
 Signal.__index = Signal
 
 ---Connects f to this signal. When the signal is emmitted, this function will be called.

data/scripts/types/vector3.lua

@@ -216,6 +216,25 @@ end
 function Vector3:copy()
   return Vector3(self)
 end
+
+---Returns a new vector as a linear interpolation between self and b.
+---@param b vectorlike
+---@param t number
+---@return Vector3
+function Vector3:lerp(b, t)
+  -- return self:copy()
+  if not is_weak_vector3(b) then
+    error("Vector3: b must be a Vector3-like table. Returning copy of self.")
+    return self:copy()
+  end
+  local w = Vector3(b)
+  return Vector3{
+    util.lerp(self.x, w.x, t),
+    util.lerp(self.y, w.y, t),
+    util.lerp(self.z, w.z, t),
+  }
+end
+
 ---- CONSTANTS
 
 Vector3.UP = Vector3(0, 1, 0)

data/scripts/util.lua

@@ -97,4 +97,24 @@ function util.list_insert_once(t, value)
   if util.list_find(t, value) ~= -1 then return end
   table.insert(t, value)
 end
+
+---linear interpolation
+---@param a number
+---@param b number
+---@param t number in [0, 1]
+---@return number
+function util.lerp(a, b, t)
+  return a + t * (b - a)
+end
+
+---constrains v between min and max
+---@param v number
+---@param min number
+---@param max number
+---@return number
+function util.clamp(v, min, max)
+  return math.max(math.min(v, max), min)
+end
+
+
 return util