/********************************** TRI-FADE **********************************\
| This animation fades through the red green and blue colors of the leds       |
| creating different mixtures of each of the colors.                           |
|                                                                              |
| Written By: Asher Glick                                                      |
| Modified By: S. Dugre to use asynchronous timer                              |
\******************************************************************************/

//int animationSpeed = 100;
int loop_tf;

void trifade() {

  if (currentState != lastState) {
    
    lastState = currentState;
    Serial.print("New State = ");
    Serial.println(currentState);

    currentTimer = 0;
    maxTimer = 0.2 * 1000 * 1000 / 16; // 0.2 seconds
    loop_tf = 1;
  }
  
  if ( timerReset) {

    switch(loop_tf){
        
      case 0 ... 7:   
        drawBox(blue,8-loop_tf,0,0,0,3,3,3);
        drawBox(red,loop_tf+1,0,0,0,3,3,3);
        flushBuffer();
        clearBuffer();
        loop_tf++;
        timerReset = false;
        break;

      case 8 ... 15:
    // red fade out, green fade in
        drawBox(red,8-(loop_tf % 8),0,0,0,3,3,3);
        drawBox(green,(loop_tf % 8)+1,0,0,0,3,3,3);
        flushBuffer();
        clearBuffer();
        loop_tf++;
        timerReset = false;
        break;

      case 16 ... 23:
    // green fade out, blue fade in
        drawBox(green,8-(loop_tf % 8),0,0,0,3,3,3);
        drawBox(blue,(loop_tf % 8)+1,0,0,0,3,3,3);
        flushBuffer();
        clearBuffer();
        loop_tf++;
        timerReset = false;
        break;

      default:
        loop_tf = 0;
        break;
    }
  }
}