demos/shine_on/scripts/DarkLine.lua

   1 --default values
   2 DarkLine = Object:new()
   3 DarkLine.type = "DarkLine"
   4
   5 DarkLine.image, DarkLine.w, DarkLine.h = get_image("images/darkline.png")
   6 DarkLine.fallspeed = 0
DarkLine.y_accel = -0.03
   7 DarkLine.lerp = nil -- will hold the transparency lerp
   8
   9 function DarkLine:new(o)
  10   o = o or {}
  11   setmetatable(o, self)
  12   self.__index = self
  13   o.anim_func = create_animation_iterator(8, 200, 1)
  14   o.lerp = create_relative_lerp(60, 255, 0)
  15   return o
  16 end
  17
  18
  19 function DarkLine:update(delta)
  20   Object.update(self, delta)
  21
  22   self.y_accel = self.y_accel - 0.002
  23
  24   self.fallspeed = self.fallspeed + self.y_accel
  25
  26   --gravity
  27   self.y = self.y + self.fallspeed
  28
  29   --bounds checking (ensure it's inside the game screen)
  30   if self.x > s_width or self.y > s_height or self.x + self.w < 0 or self.y + self.h < 0 or self.alpha == 0 then
  31     self.collect = true
  32   end
  33
  34   self.alpha = self.lerp(1)
  35
  36 end
  37
  38
  39 function DarkLine:collide(ids, object)
  40   self.collect = true
  41 end
  42
  43
  44 function DarkLine:draw()
  45   local frame, playing = self.anim_func()
  46   if playing == false then frame = 7 end
  47   display_frame(self.image, self.x-self.x_offset, self.y-self.y_offset, 8, frame,0,1,1, self.alpha)
  48 end