/* Project: 3x3x3 Mono LED Cube (r3).
 * File: MVJitter.cpp
 * Description:
 *     Movie -- mv_Jitter
 *         A single LED moves quickly and randomly around the
 *         cube.
 *
 * Copyright (C) 2014 Marc Symonds
 * All rights reserved.
 *
 * This software may be used and redistributed, with or without
 * modification, as long as it is understood that this software
 * is provided as-is without any explicit or implied warranties
 * of merchantablity or fitness of purpose.
 */

#include "Arduino.h"
#include "Movies.h"
#include "DisplayFrame.h"

void mv_Jitter()
{
  unsigned long ts, t;
  byte x, y, z, nx, ny, nz;
  
  ts = millis() + DEF_MOVIE_TIME;

  x = random(0, 3);
  y = random(0, 3);
  z = random(0, 3);
  nx = x;
  ny = y;
  nz = z;

  displayFrame[POS(x, y, z)] = MAXBRIGHTNESSLEVEL;
  
  while (millis() < ts)
  {
    t = millis() + 80;
        
    do
    {
      // Work out the next LED to light, adjacent to the current LED.
      
      switch(random(0, 3))
      {
        case 0:
          switch(random(0, 3))
          {
            case 0:
              if (nx > 0)
                --nx;
               break;
            case 2:
              if (nx < 2)
                ++nx;
              break;
          }
          break;
    
        case 1:
          switch(random(0, 3))
          {
            case 0:
              if (ny > 0)
                --ny;
              break;
            case 2:
              if (ny < 2)
                ++ny;
              break;
          }
          break;
          
        default:
          switch(random(0, 3))
          {
            case 0:
              if (nz > 0)
                --nz;
              break;
            case 2:
              if (nz < 2)
                ++nz;
              break;
          }
          break;
      }
    } while ( x == nx && y == ny && z == nz);
    
    while (millis() < t)
      ;
      
    displayFrame[POS(x,y,z)] = 0;
    displayFrame[POS(nx,ny,nz)] = MAXBRIGHTNESSLEVEL;
    
    x = nx;
    y = ny;
    z = nz;
  }

  displayFrame[POS(nx,ny,nz)] = 0;
}

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