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Colorduino Library V1.1 (Compatible With Colors Shield)




  ColorduinoPlasma – Plasma demo using Colorduino Library for Arduino
  Copyright (c) 2011 Sam C. Lin ALL RIGHTS RESERVED

  based on  Color cycling plasma  
    Version 0.1 – 8 July 2009
    Copyright (c) 2009 Ben Combee.  All right reserved.
    Copyright (c) 2009 Ken Corey.  All right reserved.
    Copyright (c) 2008 Windell H. Oskay.  All right reserved.
    Copyright (c) 2011 Sam C. Lin All Rights Reserved

  This demo is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This demo is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

#include <Colorduino.h>

typedef struct
  unsigned char r;
  unsigned char g;
  unsigned char b;
} ColorRGB;

//a color with 3 components: h, s and v
typedef struct
  unsigned char h;
  unsigned char s;
  unsigned char v;
} ColorHSV;

unsigned char plasma[ColorduinoScreenWidth][ColorduinoScreenHeight];
long paletteShift;

//Converts an HSV color to RGB color
void HSVtoRGB(void *vRGB, void *vHSV)
  float r, g, b, h, s, v; //this function works with floats between 0 and 1
  float f, p, q, t;
  int i;
  ColorRGB *colorRGB=(ColorRGB *)vRGB;
  ColorHSV *colorHSV=(ColorHSV *)vHSV;

  h = (float)(colorHSV->h / 256.0);
  s = (float)(colorHSV->s / 256.0);
  v = (float)(colorHSV->v / 256.0);

  //if saturation is 0, the color is a shade of grey
  if(s == 0.0) {
    b = v;
    g = b;
    r = g;
  //if saturation > 0, more complex calculations are needed
    h *= 6.0; //to bring hue to a number between 0 and 6, better for the calculations
    i = (int)(floor(h)); //e.g. 2.7 becomes 2 and 3.01 becomes 3 or 4.9999 becomes 4
    f = h – i;//the fractional part of h

    p = (float)(v * (1.0 – s));
    q = (float)(v * (1.0 – (s * f)));
    t = (float)(v * (1.0 – (s * (1.0 – f))));

      case 0: r=v; g=t; b=p; break;
      case 1: r=q; g=v; b=p; break;
      case 2: r=p; g=v; b=t; break;
      case 3: r=p; g=q; b=v; break;
      case 4: r=t; g=p; b=v; break;
      case 5: r=v; g=p; b=q; break;
      default: r = g = b = 0; break;
  colorRGB->r = (int)(r * 255.0);
  colorRGB->g = (int)(g * 255.0);
  colorRGB->b = (int)(b * 255.0);


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