Added Fader class.

main.lua

@@ -4,6 +4,7 @@
 
 local love = require 'love'
 local game_states = require 'src.states'
+local Fader = require 'src.fader'
 
 
 ------------------------------------------------------------------------------
@@ -11,27 +12,17 @@ local game_states = require 'src.states'
 ------------------------------------------------------------------------------
 
 Current_state = 1
-Fade_in = 0.0
-Fade_out = 1.0
+Fade = Fader()
 Change_state = false
 
 
-------------------------------------------------------------------------------
--- Game methods
-------------------------------------------------------------------------------
-
-local function lerp(a, b, t)
-    -- Linear interpolation between two values a and b, by a t between 0.0 and 1.0
-    return (a * t) + (b * (1.0 - t))
-end
-
-
 ------------------------------------------------------------------------------
 -- Game methods
 ------------------------------------------------------------------------------
 
 function love.load()
     game_states[Current_state]:load()
+    Fade:fade_in()
 end
 
 
@@ -39,66 +30,43 @@ function love.update(dt)
     local new_state = game_states[Current_state]:update(dt)
 
     -- If the game state changed then trigger a fade out.
-    if new_state ~= Current_state and Fade_out >= 1.0 then
-        Fade_out = 0.0
+    if new_state ~= Current_state and Fade.done then
+        Fade:fade_out()
         Change_state = true
     end
 
-    -- If there is a fade in going then update it.
-    if Fade_in < 1.0 then
-        Fade_in = Fade_in + (dt / 2)
-    end
-
-    -- If there is a fade out going then update it.
-    if Fade_out < 1.0 then
-        Fade_out = Fade_out + (dt / 2)
-    end
+    Fade:update(dt)
 
     -- Update the game state.
     if game_states[new_state] == nil then
         -- If the new state doesn't exist then wait for the fade out to end and quit.
-        if Fade_out >= 1.0 then
+        if Fade.done then
             game_states[Current_state]:unload(dt)
             love.event.quit()
         end
     else
         -- If the new state exists then unload it's data and set the new state.
-        if Change_state and Fade_out >= 1.0 then
+        if Change_state and Fade.done then
             game_states[Current_state]:unload(dt)
             Current_state = new_state
             game_states[Current_state]:load()
             Change_state = false
+            Fade:fade_in()
         end
     end
 end
 
 
 function love.draw()
-    -- Reset the drawing color and clear the screen.
     love.graphics.clear()
-
-    -- Render the current game state.
     game_states[Current_state]:draw()
-
-    -- If there is a fade in going then render it.
-    if Fade_in < 1.0 then
-        love.graphics.setColor(0, 0, 0)
-        love.graphics.circle('fill', -320, love.graphics.getHeight() / 2, lerp(0, 400 * 2, Fade_in))
-        love.graphics.setColor()
-    end
-
-    -- If there is a fade out going then render it.
-    if Fade_out < 1.0 then
-        love.graphics.setColor(0, 0, 0)
-        love.graphics.circle('fill', -320, love.graphics.getHeight() / 2, lerp(400 * 2, 0, Fade_out))
-        love.graphics.setColor()
-    end
+    Fade:draw()
 end
 
 
 function love.keypressed(key)
     -- Send events to the active game state if there is no fade active.
-    if Fade_in >= 1.0 and Fade_out >= 1.0 then
+    if Fade.done then
         game_states[Current_state]:keypressed(key)
     end
 end
@@ -106,7 +74,7 @@ end
 
 function love.mousemoved(x, y)
     -- Send events to the active game state if there is no fade active.
-    if Fade_in >= 1.0 and Fade_out >= 1.0 then
+    if Fade.done then
         game_states[Current_state]:mousemoved(x, y)
     end
 end
@@ -114,7 +82,7 @@ end
 
 function love.mousepressed(x, y, btn)
     -- Send events to the active game state if there is no fade active.
-    if Fade_in >= 1.0 and Fade_out >= 1.0 then
+    if Fade.done then
         game_states[Current_state]:mousemoved(x, y, btn)
     end
 end