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Viewing changes to enemy.lua

  • Committer: Josh C
  • Date: 2013-06-16 20:20:20 UTC
  • Revision ID: josh@9ix.org-20130616202020-dcra09dhl5bdx8lc
rotate enemy ship slower

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enemy.lua
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local accelLimit = 300 * 2 -- same as the player, yes?
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local velLimit = 600 -- same as player
 
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-- player = 300 accel, 400 velLimit
 
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local accelLimit = 150
 
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local velLimit = 200
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Enemy = Tile:extend {
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   image = 'data/enemy.png',
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   maxVelocity = {x=velLimit,y=velLimit},
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   minVelocity = {x=-velLimit, y=-velLimit},
 
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   lastFired = 0,
 
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   onNew = function (self)
 
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              self.thrust = Tile:new{image = 'data/thrust.png'}
 
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              --the.app.view:add(self.thrust)
 
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           end,
 
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   onStartFrame = function (self)
 
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                     local pvec = vector.new(the.player.x - self.x,
 
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                                             the.player.y - self.y)
 
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                     local pAngle = math.atan2(pvec.y, pvec.x)
 
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                     local aDiff = self.rotation - pAngle
 
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                     while aDiff < (-math.pi) do
 
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                        --print(aDiff .. ' < -π')
 
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                        aDiff = aDiff + 2 * math.pi
 
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                     end
 
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                     while aDiff > math.pi do
 
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                        --print(aDiff .. ' > π')
 
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                        aDiff = aDiff - 2 * math.pi
 
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                     end
 
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                     if math.abs(aDiff) > 0.1 then
 
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                        -- rotation really shouldn't be negative.  I
 
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                        -- don't understand why that is.  :\
 
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                        self.velocity.rotation = -2 * util.signOf(aDiff)
 
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                     else
 
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                        --print('not rotating')
 
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                        self.velocity.rotation = 0
 
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                     end
 
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                     local pdist2 = pvec:len2()
 
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                     if pdist2 > 400^2 then -- ... if player dist > 64?
 
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                        self.acceleration = vector.new(300, 0)
 
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                        self.acceleration:rotate_inplace(self.rotation)
 
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                        self.thrust.visible = true
 
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                     else
 
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                        self.acceleration = {x=0, y=0}
 
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                        self.thrust.visible = false
 
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                     end
 
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                     if math.abs(aDiff) < 0.5 * math.pi and
 
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                       pdist2 < 400^2 and
 
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                       love.timer.getTime() - self.lastFired > 0.25 then
 
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                       --print('pew')
 
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                         b = Bullet:new{
 
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                            x = self.x + self.width / 2,
 
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                            y = self.y + self.height / 2,
 
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                            rotation = self.rotation
 
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                         }
 
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                         self.lastFired = love.timer.getTime()
 
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                     end
 
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                  end,
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   onUpdate = function(self)
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                 -- find where player is relative to us
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                 local dx = the.player.x - self.x
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                 local dy = the.player.y - self.y
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                 local ax, ay = dx, dy
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                 if math.abs(dx) > math.abs(accelLimit) then
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                    ax = accelLimit * util.signOf(dx)
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                    ay = accelLimit * math.abs(dx) / dy
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                 elseif math.abs(dy) > math.abs(accelLimit) then
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                    ay = accelLimit * util.signOf(dy)
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                    ax = accelLimit * math.abs(dy) / dx
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                 end
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                 self.acceleration.x = ax
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                 self.acceleration.y = ay
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                 self.rotation = math.atan2(self.velocity.y, self.velocity.x)
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              end
 
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                 self.thrust.x = self.x - self.width
 
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                 self.thrust.y = self.y
 
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                 self.thrust.rotation = self.rotation
 
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              end,
 
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}
 
 
b'\\ No newline at end of file'