how to draw a flowchart for showSpectrum & showRGB

how draw flowchart showspectrum & showrgb

can show me start before can contiune

void showspectrum()
{
  int x;
 
  for(x = 0; x < 768; x++)
  {
    showrgb(x);
    delay(10);
  }
} 
 
void showrgb(int color)
{
  int redintensity;
  int greenintensity;
  int blueintensity;
 
  if (color <= 255) // zone 1
  {
    redintensity = 255 - color; // redgoes on off
    greenintensity = color;    //  green goes fromoff on
    blueintensity = 0;         //  blue off
  } 
  else if (color <= 511) //zone 2
  {
    redintensity = 0;                     // red off
    greenintensity = 255 - (color - 256); // green on off
    blueintensity = (color - 256);        // blue off on
  }
  else // color >= 512    //  zone3
  {
     redintensity = (color - 512);        // red if off on
    greenintensity = 0;                  // green off
    blueintensity = 255 - (color - 512); // blue off on
  }

    analogwrite(red_pin, redintensity);
    analogwrite(green_pin, greenintensity);
    analogwrite(blue_pin, blueintensity);
}   

what need understand?

the code has value varying between 0 , 767

when value between 0 , 255 there inversely correlated mix between red , green full red , no green full green , no red

then 256 511 green , blue mixed - go full green (so continuation of previous color) full blue

then 512 767 mix blue , red full blue full red


this pretty crude because human eyes not perceive r, g or b same way inverse correlation of mix not deliver superbly looking rainbow spectrum.

also make sure wire rgb led right way current limiting resistors, colors don't have same forward voltage still send 0 5v each pin (blue , green have same specs same resistor, red needs higher resistor). remember max current ability of arduino when defining resistor values.

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