--[[--

Mandulia -- Mandelbrot/Julia explorer
Copyright (C) 2010  Claude Heiland-Allen <claudiusmaximus@goto10.org>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

--]]--

require("defaults")

do

  local delta = { x = 0, y = 0, z = 0 }
  local speed = 0.01
  
  local phi  = (math.sqrt(5) + 1) / 2
  local phi1 = (math.sqrt(5) - 1) / 2
  
  local keys =
    { Escape   = function() mandulia.quit() end
    , F11      = function() mandulia.fullscreen = not mandulia.fullscreen end
    , Right    = function() delta.x = delta.x + 1 end
    , Left     = function() delta.x = delta.x - 1 end
    , Up       = function() delta.y = delta.y + 1 end
    , Down     = function() delta.y = delta.y - 1 end
    , PageUp   = function() delta.z = delta.z + 1 end
    , PageDown = function() delta.z = delta.z - 1 end
    , End      = function() delta         = { x = 0, y = 0, z = 0 } end
    , Home     = function() mandulia.view = { x = 0, y = 0, z = 0 } end
    , ["["]    = function() speed = speed * 0.95 end
    , ["]"]    = function() speed = speed / 0.95 end
    , ["#"]    = function() speed = 0.01 end
    }
  
  function mandulia.render()
    mandulia.view.x = mandulia.view.x + speed * delta.x * phi1 ^ mandulia.view.z
    mandulia.view.y = mandulia.view.y + speed * delta.y * phi1 ^ mandulia.view.z
    mandulia.view.z = mandulia.view.z + speed * delta.z 
  end
  
  function mandulia.keyboard(key)
    if type(keys[key]) == "function" then keys[key]() end
  end
  
end