/* Derived from Adafruit RGB_matrix_Panel library */
#include <SPI.h>
#include <Adafruit_GFX.h> // Core graphics library
#include <P3RGB64x32MatrixPanel.h>

// constructor with default pin wiring
P3RGB64x32MatrixPanel matrix;

// use this constructor for custom pin wiring instead of the default above
// these pins are an example, you may modify this according to your needs
//P3RGB64x32MatrixPanel matrix(25, 26, 27, 21, 22, 23, 15, 32, 33, 12, 16, 17, 18);
uint16_t Wheel(byte WheelPos)
{
    if (WheelPos < 8)
    {
        return matrix.color444(15 - WheelPos * 2, WheelPos * 2, 0);
    }
    else if (WheelPos < 16)
    {
        WheelPos -= 8;
        return matrix.color444(0, 15 - WheelPos * 2, WheelPos * 2);
    }
    else
    {
        WheelPos -= 16;
        return matrix.color444(0, WheelPos * 2, 7 - WheelPos * 2);
    }
}

void setup()
{

    matrix.begin();
    // whew!
}

void loop()
{
    // do nothing
    for (int i = 0; i < matrix.height(); i++)
    {
        matrix.drawLine(0,i,64,i,matrix.color444(i,15,15));
        delay(100);
    }
    matrix.fillRect(0, 0, matrix.width(), matrix.height(), matrix.color444(0, 0, 0));
}

// Input a value 0 to 24 to get a color value.
// The colours are a transition r - g - b - back to r.