#include "MD_MAXPanel.h"
const MD_MAX72XX::moduleType_t   HARDWARE_TYPE = MD_MAX72XX::PAROLA_HW;
MD_MAXPanel matrix = MD_MAXPanel(HARDWARE_TYPE, 11, 12, 10, 4, 1);
int X[64];          int Y[64];
int n=1;		        int xa,ya;  /*ябл*/    int d=0;
int newA() { xa=random(31);   ya=random(7);  } 

void setup() { Serial.begin(9600); matrix.begin(); newA(); X[0]=0; Y[0]=0; }   //нач.полож змеи       

unsigned long Time, Time1=0;    int i, x, y;
void loop() {
    x = analogRead(A1);      y = analogRead(A0);

    if (y < 100)  d=0;  //вниз   (по увеличению Y)
    if (y > 900)  d=1;  //вверх  (по уменьшению Y)
  
    if (x < 100)  d=2;  //влево  (по увеличению Х)
    if (x > 900)  d=3;  //вправо (по уменьшению Х)  // Serial.println(x);
    
    Time = millis();  
    if(Time-Time1>200)               
    { Time1 = Time;  
      if(Y[0]==ya && X[0]==xa)     { n++;       newA(); }   

      for(i=n-1; i>0; i--) { //сдвиг координат хвоста, с уменьшением индекса массива
       Y[i]=Y[i-1];       X[i]=X[i-1];         }
                                            
      if(d==0)  Y[0]=(Y[0]+1)%8;  // остаток от дел на 8
      if(d==1)  Y[0]=(Y[0]+7)%8;  // Serial.println(Y[0]);  
      if(d==2)  X[0]=(X[0]+31)%32;
      if(d==3)  X[0]=(X[0]+1)%32;
    
      for(i=n-1; i>=1; i--) 
      if(X[0]==X[i] && Y[0]==Y[i]) { n=1; Serial.println("YKYC XBOCTA"); }
      
      matrix.clear();
      for(i=0; i<n; i++)  matrix.setPoint(X[i], Y[i], true);    //змея
                          matrix.setPoint(xa,   ya,   true);    //яблоко
    }         }


Meteor.ino

diagram.json

# Wokwi Library List
# See https://docs.wokwi.com/guides/libraries
MD_MAX72XX


libraries.txt

MD_MAXPanel.h

/*  MD_MAXPanel - Library for MAX7219/7221 LED Panel
See header file for comments
This file contains class and hardware related methods.
Copyright (C) 2018-23 Marco Colli. All rights reserved.

This library 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 library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 <Arduino.h>
#include "MD_MAXPanel.h"
#include "MD_MAXPanel_lib.h"

/**
 * \file
 * \brief Implements class graphics methods
 */

MD_MAXPanel::MD_MAXPanel(MD_MAX72XX::moduleType_t mod, uint8_t dataPin, uint8_t clkPin, uint8_t csPin, uint8_t xDevices, uint8_t yDevices) :
_xDevices(xDevices), _yDevices(yDevices), _rotatedDisplay(false)
{
  _D = new MD_MAX72XX(mod, dataPin, clkPin, csPin, xDevices*yDevices);
  _killOnDestruct = true;
}

MD_MAXPanel::MD_MAXPanel(MD_MAX72XX::moduleType_t mod, uint8_t csPin, uint8_t xDevices, uint8_t yDevices) :
_xDevices(xDevices), _yDevices(yDevices), _rotatedDisplay(false)
{
  _D = new MD_MAX72XX(mod, csPin, xDevices*yDevices);
  _killOnDestruct = true;
}

MD_MAXPanel::MD_MAXPanel(MD_MAX72XX *D, uint8_t xDevices, uint8_t yDevices) :
_xDevices(xDevices), _yDevices(yDevices), _rotatedDisplay(false)
{
  _D = D;
  _killOnDestruct = false;
}

MD_MAXPanel::MD_MAXPanel(MD_MAX72XX::moduleType_t mod, SPIClass &spi, uint8_t csPin, uint8_t xDevices, uint8_t yDevices) :
_xDevices(xDevices), _yDevices(yDevices), _rotatedDisplay(false)
{
  _D = new MD_MAX72XX(mod, spi, csPin, xDevices*yDevices);
  _killOnDestruct = true;
}

bool MD_MAXPanel::begin(void)
{
  bool b = _D->begin();

  _charSpacing = CHAR_SPACING_DEFAULT;
  _updateEnabled = true;

  return(b);
}

MD_MAXPanel::~MD_MAXPanel(void)
{
  if (_killOnDestruct) delete _D;
}

uint16_t MD_MAXPanel::getXMax(void)
{ 
  uint16_t m;

  if (_rotatedDisplay)
    m = (_yDevices * ROW_SIZE) - 1;
  else
    m = (_xDevices * COL_SIZE) - 1;

  return(m);
}

uint16_t MD_MAXPanel::getYMax(void) 
{ 
  uint16_t m;

  if (_rotatedDisplay)
    m = (_xDevices * COL_SIZE) - 1;
  else
    m = (_yDevices * ROW_SIZE) - 1;

  return(m);
}

bool MD_MAXPanel::drawHLine(uint16_t y, uint16_t x1, uint16_t x2, bool state)
// draw a horizontal line at row y between columns x1 and x2 inclusive
{
  bool b = true;

  _D->control(MD_MAX72XX::UPDATE, MD_MAX72XX::OFF);

  if (x1 > x2)      // swap x1/x2
  {
    uint16_t  t = x1;
    x1 = x2;
    x2 = t;
  }

  for (uint16_t i = x1; i <= x2; i++)
    b &= setPoint(i, y, state);

  update(_updateEnabled);

  return(b);
}

bool MD_MAXPanel::drawVLine(uint16_t x, uint16_t y1, uint16_t y2, bool state)
// draw a vertical line at column x between rows y1 and y2 inclusive
{
  bool b = true;

  _D->control(MD_MAX72XX::UPDATE, MD_MAX72XX::OFF);

  if (y1 > y2)      // swap y1/y2
  {
    uint8_t  t = y1;
    y1 = y2;
    y2 = t;
  }

  for (uint8_t i = y1; i <= y2; i++)
    b &= setPoint(x, i, state);

  update(_updateEnabled);

  return(b);
}

bool MD_MAXPanel::drawLine(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, bool state)
// draw an arbitrary line between two points using Bresentham's line algorithm
// Bresentham's line algorithm at https://rosettacode.org/wiki/Bitmap/Bresenham%27s_line_algorithm#C
{
  bool b = true;

  _D->control(MD_MAX72XX::UPDATE, MD_MAX72XX::OFF);

  PRINT("\n\nLine from ", x1); PRINT(",", y1);
  PRINT(" to ", x2); PRINT(",", y2);

  if (x1 > x2)    // swap direction for line
  {
    uint16_t t;

    t = x1; x1 = x2; x2 = t;
    t = y1; y1 = y2; y2 = t;
    //    PRINTS(" SWAP X");
  }

  //  PRINT("\nPlotting from ", x1); PRINT(",", y1);
  //  PRINT(" to ", x2); PRINT(",", y2);

  int16_t dx = x2 - x1;
  int16_t sx = 1;
  int16_t dy = y2 - y1;
  if (dy < 0) dy = -dy;
  int16_t sy = y1 < y2 ? 1 : -1;
  int16_t err = (dx > dy ? dx : -dy) / 2;
  int16_t e2;

  //  PRINT("\ndx=", dx);
  //  PRINT(" dy=", dy);
  //  PRINT(" ystep=", sy);
  //  PRINT(" xstep=", sx);

  for (;;)
  {
    //    PRINT("\nerror=", err);
    //    PRINT(" [", x1); PRINT(",", y1); PRINTS("]");

    b &= setPoint(x1, y1, state);
    if (x1 == x2 && y1 == y2) break;
    e2 = err;
    if (e2 >-dx) { err -= dy; x1 += sx; }
    if (e2 < dy) { err += dx; y1 += sy; }
  }

  update(_updateEnabled);

  return(b);
}

bool MD_MAXPanel::drawRectangle(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, bool state)
// draw a rectangle given the 2 diagonal vertices
{
  bool b = true;
  bool u = _updateEnabled;

  _D->control(MD_MAX72XX::UPDATE, MD_MAX72XX::OFF);
  update(false);

  b &= drawHLine(y1, x1, x2, state);
  b &= drawHLine(y2, x1, x2, state);
  b &= drawVLine(x1, y1, y2, state);
  b &= drawVLine(x2, y1, y2, state);
  
  update(u);

  return(b);
}

bool MD_MAXPanel::drawFillRectangle(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, bool state)
{
  bool b = true;
  bool u = _updateEnabled;

  _D->control(MD_MAX72XX::UPDATE, MD_MAX72XX::OFF);
  update(false);

  for (uint8_t i = x1; i <= x2; i++)
    drawVLine(i, y1, y2, state);

  update(u);

  return(b);
};

bool MD_MAXPanel::drawQuadrilateral(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t x3, uint16_t y3, uint16_t x4, uint16_t y4, bool state)
// draw a arbitrary quadrilateral given the 4 corner vertices
{
  bool b = true;
  bool u = _updateEnabled;

  _D->control(MD_MAX72XX::UPDATE, MD_MAX72XX::OFF);
  update(false);

  b &= drawLine(x1, y1, x2, y2, state);
  b &= drawLine(x2, y2, x3, y3, state);
  b &= drawLine(x3, y3, x4, y4, state);
  b &= drawLine(x4, y4, x1, y1, state);

  update(u);

  return(b);
}

bool MD_MAXPanel::drawTriangle(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t x3, uint16_t y3, bool state)
// draw an arbitrary triangle given the 3 corner vertices
{
  bool b = true;
  bool u = _updateEnabled;

  _D->control(MD_MAX72XX::UPDATE, MD_MAX72XX::OFF);
  update(false);

  b &= drawLine(x1, y1, x2, y2, state);
  b &= drawLine(x2, y2, x3, y3, state);
  b &= drawLine(x3, y3, x1, y1, state);

  update(u);

  return(b);
}

/*
bool MD_MAXPanel::drawFillTriangle(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t x3, uint16_t y3, bool state)
// draw an arbitrary filled triangle given the 3 corner vertices
// Uses slope method, originally from Adafruit Industries
{
#define SWAP(a, b) { uint16_t t = a; a = b; b = t; }

  uint8_t a, b, y, last;
  bool r = true;
  bool u = _updateEnabled;

  _D->control(MD_MAX72XX::UPDATE, MD_MAX72XX::OFF);
  update(false);

  // Sort coordinates by Y order (y3 >= y2 >= y1)
  if (y1 > y2) { SWAP(y1, y2); SWAP(x1, x2); }
  if (y2 > y3) { SWAP(y3, y2); SWAP(x3, x2); }
  if (y1 > y2) { SWAP(y1, y2); SWAP(x1, x2); }

  if (y1 == y3) // All in same line
  {
    a = b = x1;
    if (x2 < a)      a = x2;
    else if (x2 > b) b = x2;

    if (x3 < a)      a = x3;
    else if (x3 > b) b = x3;

    r &= drawHLine(y1, a, b, state);
  }
  else
  {
    int8_t dx12 = x2 - x1;
    int8_t dy12 = y2 - y1;
    int8_t dx13 = x3 - x1;
    int8_t dy13 = y3 - y1;
    int8_t dx23 = x3 - x2;
    int8_t dy23 = y3 - y2;
    int16_t sa = 0, sb = 0;

    // For upper part of triangle, find scanline crossings for segment
    // 1-2 and 1-3.  If y2=y3 (flat-bottomed triangle), the scanline y
    // is included here (and second loop will be skipped, avoiding a /0
    // error there), otherwise scanline y2 is skipped here and handle
    // in the second loop...which also avoids a /0 error here if y1=y
    // (flat-topped triangle)
    if (y2 == y3) last = y2;   // Include y2 scanline
    else          last = y2 - 1; // Skip it

    for (y = y1; y <= last; y++)
    {
      a = x1 + sa / dy12;
      b = x1 + sb / dy13;
      sa += dx12;
      sb += dx13;
      // longhand a = x1 + (x2 - x1) * (y - y1) / (y2 - y1)
      //          b = x0 + (x3 - x1) * (y - y1) / (y3 - y1)
      r &= drawHLine(y, a, b, state);
    }

    // For lower part of triangle, find scanline crossings for segment
    // 1-3 and 2-3.  This loop is skipped if y2=y3
    sa = dx23 * (y - y2);
    sb = dx13 * (y - y1);
    for (; y <= y3; y++)
    {
      a = x2 + sa / dy23;
      b = x1 + sb / dy13;
      sa += dx23;
      sb += dx13;
      // longhand a = x2 + (x3 - x2) * (y - y2) / (y3 - y2)
      //          b = x1 + (x2 - x1) * (y - y1) / (y3 - y1)
      r &= drawHLine(y, a, b, state);
    }
  }

  update(u);

  return(r);
}
*/

bool MD_MAXPanel::drawFillTriangle(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t x3, uint16_t y3, bool state)
// Fill a triangle - Bresenham method
// Original from http://www.sunshine2k.de/coding/java/TriangleRasterization/TriangleRasterization.html
{
#define SWAP(a, b) { uint16_t t = a; a = b; b = t; }

  uint8_t t1x, t2x, y, minx, maxx, t1xp, t2xp;
  bool changed1 = false;
  bool changed2 = false;
  int8_t signx1, signx2, dx1, dy1, dx2, dy2;
  uint8_t e1, e2;
  bool b = true;
  bool u = _updateEnabled;

  _D->control(MD_MAX72XX::UPDATE, MD_MAX72XX::OFF);
  update(false);

  // Sort vertices
  if (y1>y2) { SWAP(y1, y2); SWAP(x1, x2); }
  if (y1>y3) { SWAP(y1, y3); SWAP(x1, x3); }
  if (y2>y3) { SWAP(y2, y3); SWAP(x2, x3); }

  t1x = t2x = x1; y = y1;   // Starting points

  dx1 = (int8_t)(x2 - x1); 
  if (dx1<0) { dx1 = -dx1; signx1 = -1; }
  else signx1 = 1;
  dy1 = (int8_t)(y2 - y1);

  dx2 = (int8_t)(x3 - x1); 
  if (dx2<0) { dx2 = -dx2; signx2 = -1; }
  else signx2 = 1;
  dy2 = (int8_t)(y3 - y1);

  if (dy1 > dx1) // swap values
  {
    SWAP(dx1, dy1);
    changed1 = true;
  }
  if (dy2 > dx2) // swap values
  {
    SWAP(dy2, dx2);
    changed2 = true;
  }

  e2 = (uint8_t)(dx2 >> 1);
  // Flat top, just process the second half
  if (y1 == y2) goto next;
  e1 = (uint8_t)(dx1 >> 1);

  for (uint8_t i = 0; i < dx1;) 
  {
    t1xp = 0; t2xp = 0;
    if (t1x<t2x) { minx = t1x; maxx = t2x; }
    else		     { minx = t2x; maxx = t1x; }
    // process first line until y value is about to change
    while (i<dx1) 
    {
      i++;
      e1 += dy1;
      while (e1 >= dx1) 
      {
        e1 -= dx1;
        if (changed1) t1xp = signx1;//t1x += signx1;
        else          goto next1;
      }
      if (changed1) break;
      else t1x += signx1;
    }
    // Move line
  next1:
    // process second line until y value is about to change
    while (1) 
    {
      e2 += dy2;
      while (e2 >= dx2) 
      {
        e2 -= dx2;
        if (changed2) t2xp = signx2;//t2x += signx2;
        else          goto next2;
      }
      if (changed2)     break;
      else              t2x += signx2;
    }
  next2:
    if (minx>t1x) minx = t1x; 
    if (minx>t2x) minx = t2x;
    if (maxx<t1x) maxx = t1x; 
    if (maxx<t2x) maxx = t2x;
    b &= drawHLine(y, minx, maxx, state); // Draw line from min to max points found on the y
    // Now increase y
    if (!changed1) t1x += signx1;
    t1x += t1xp;
    if (!changed2) t2x += signx2;
    t2x += t2xp;
    y += 1;
    if (y == y2) break;

  }
  next:
  // Second half
  dx1 = (int8_t)(x3 - x2); 
  if (dx1<0) { dx1 = -dx1; signx1 = -1; }
  else       signx1 = 1;
  dy1 = (int8_t)(y3 - y2);
  t1x = x2;

  if (dy1 > dx1) 
  {   // swap values
    SWAP(dy1, dx1);
    changed1 = true;
  }
  else changed1 = false;

  e1 = (uint8_t)(dx1 >> 1);

  for (uint8_t i = 0; i <= dx1; i++) 
  {
    t1xp = 0; t2xp = 0;
    if (t1x<t2x) { minx = t1x; maxx = t2x; }
    else		     { minx = t2x; maxx = t1x; }
    // process first line until y value is about to change
    while (i<dx1) 
    {
      e1 += dy1;
      while (e1 >= dx1) 
      {
        e1 -= dx1;
        if (changed1) { t1xp = signx1; break; }//t1x += signx1;
        else          goto next3;
      }
      if (changed1) break;
      else   	   	  t1x += signx1;
      if (i<dx1) i++;
    }
  next3:
    // process second line until y value is about to change
    while (t2x != x3) 
    {
      e2 += dy2;
      while (e2 >= dx2) 
      {
        e2 -= dx2;
        if (changed2) t2xp = signx2;
        else          goto next4;
      }
      if (changed2) break;
      else          t2x += signx2;
    }
  next4:

    if (minx>t1x) minx = t1x; 
    if (minx>t2x) minx = t2x;
    if (maxx<t1x) maxx = t1x; 
    if (maxx<t2x) maxx = t2x;
    b &= drawHLine(y, minx, maxx, state);    // Draw line from min to max points found on the y
    // Now increase y
    if (!changed1) t1x += signx1;
    t1x += t1xp;
    if (!changed2) t2x += signx2;
    t2x += t2xp;
    y += 1;
    if (y>y3) goto outtahere;
  }

outtahere:
  update(u);

  return(b);
}


bool MD_MAXPanel::drawCirclePoints(uint16_t xc, uint16_t yc, uint16_t x, uint16_t y, bool state)
// draw symmetrical circle points
{
  bool b = true;

  b &= setPoint(xc + x, yc + y, state);
  b &= setPoint(xc - x, yc + y, state);
  b &= setPoint(xc + x, yc - y, state);
  b &= setPoint(xc - x, yc - y, state);
  b &= setPoint(xc + y, yc + x, state);
  b &= setPoint(xc - y, yc + x, state);
  b &= setPoint(xc + y, yc - x, state);
  b &= setPoint(xc - y, yc - x, state);

  return(b);
}

bool MD_MAXPanel::drawCircle(uint16_t xc, uint16_t yc, uint16_t r, bool state)
// draw a circle given center and radius
// Bresenhams Algorith from http://www.pracspedia.com/CG/bresenhamcircle.html
{
  int x = 0, y = r;
  int pk = 3 - (2 * r);
  bool b = false;

  _D->control(MD_MAX72XX::UPDATE, MD_MAX72XX::OFF);

  PRINT("\n\nCircle center ", xc); PRINT(",", yc); PRINT(" radius ", r);

  b &= drawCirclePoints(xc, yc, x, y, state);

  while (x < y)
  {
    // check for decision parameter and correspondingly update pk, x, y
    if (pk <= 0)
    {
      pk = pk + (4 * x) + 6;
      b &= drawCirclePoints(xc, yc, ++x, y, state);
    }
    else
    {
      pk = pk + (4 * (x - y)) + 10;
      b &= drawCirclePoints(xc, yc, ++x, --y, state);
    }
  }

  update(_updateEnabled);

  return(b);
}

bool MD_MAXPanel::drawCircleLines(uint16_t xc, uint16_t yc, uint16_t x, uint16_t y, bool state)
// draw symmetrical circle lines for the filled circle
{
  bool b = true;

  b &= drawHLine(yc - y, xc - x, xc + x, state);
  b &= drawHLine(yc + y, xc - x, xc + x, state);
  b &= drawHLine(yc - x, xc - y, xc + y, state);
  b &= drawHLine(yc + x, xc - y, xc + y, state);

  return(b);
}

bool MD_MAXPanel::drawFillCircle(uint16_t xc, uint16_t yc, uint16_t r, bool state)
// Draw a filled circle given center and radius
// Bresenhams Algorith from http://www.pracspedia.com/CG/bresenhamcircle.html
{
  int x = 0, y = r;
  int pk = 3 - (2 * r);
  bool b = false;
  bool u = _updateEnabled;

  _D->control(MD_MAX72XX::UPDATE, MD_MAX72XX::OFF);
  update(false);

  PRINT("\n\nFilled Circle center ", xc); PRINT(",", yc); PRINT(" radius ", r);
  b &= drawCircleLines(xc, yc, x, y, state);
  while (x < y)
  {
    // check for decision parameter and correspondingly update pk, x, y
    if (pk <= 0)
    {
      pk = pk + (4 * x) + 6;
      b &= drawCircleLines(xc, yc, ++x, y, state);
    }
    else
    {
      pk = pk + (4 * (x - y)) + 10;
      b &= drawCircleLines(xc, yc, ++x, --y, state);
    }
  }

  update(u);

  return(b);
}

uint16_t MD_MAXPanel::Y2Row(uint16_t x, uint16_t y)
// Convert y coord to linear coord
{
  uint16_t Y;

  if (_rotatedDisplay)
  {
    x = getXMax() - x;
    Y = (ROW_SIZE - (x % ROW_SIZE) - 1);
  }
  else
    Y = (ROW_SIZE - (y % ROW_SIZE) - 1);

  return(Y);
}

uint16_t MD_MAXPanel::X2Col(uint16_t x, uint16_t y)
// Convert x coord to linear coord
{
  uint16_t X;

  if (_rotatedDisplay)
  {
    x = getXMax() - x;
    X = ((x / ROW_SIZE) * (_xDevices * COL_SIZE) + (_xDevices * COL_SIZE) - 1 - (y % (_xDevices * COL_SIZE)));
  }
  else
    X = ((y / ROW_SIZE) * (_xDevices * COL_SIZE) + (_xDevices * COL_SIZE) - 1 - (x % (_xDevices * COL_SIZE)));

  return(X);
}

bool MD_MAXPanel::getPoint(uint16_t x, uint16_t y)
{
  if (x > getXMax() || y > getYMax())
    return(false);

  return(_D->getPoint(Y2Row(x,y), X2Col(x,y)));
}

bool MD_MAXPanel::setPoint(uint16_t x, uint16_t y, bool state)
{
  if (x > getXMax() || y > getYMax())
    return(false);

  //PRINT("[", x); PRINT(",", y); PRINTS("]");

  return(_D->setPoint(Y2Row(x,y), X2Col(x,y), state));
}

MD_MAXPanel.cpp

/*
MD_MAXPanel - Library for panels of MAX72xx LED matrix controllers

See header file for comments

This file contains library related definitions and is not visible
to user code.

Copyright (C) 2018 Marco Colli. All rights reserved.

This library 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 library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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
 */
#pragma once

/**
 * \file
 * \brief Includes library only definitions
 */

#define MP_DEBUG 0   ///< Enable or disable (default) debugging output from the MD_MAX72xx library

#if MP_DEBUG
#define PRINT(s, v)   { Serial.print(F(s)); Serial.print(v); }      ///< Print a string followed by a value (decimal)
#define PRINTX(s, v)  { Serial.print(F(s)); Serial.print(v, HEX); } ///< Print a string followed by a value (hex)
#define PRINTB(s, v)  { Serial.print(F(s)); Serial.print(v, BIN); } ///< Print a string followed by a value (binary)
#define PRINTS(s)     { Serial.print(F(s)); }                       ///< Print a string
#else
#define PRINT(s, v)   ///< Print a string followed by a value (decimal)
#define PRINTX(s, v)  ///< Print a string followed by a value (hex)
#define PRINTB(s, v)  ///< Print a string followed by a value (binary)
#define PRINTS(s)     ///< Print a string
#endif

#define X2COL(x, y) (((y / ROW_SIZE) * (getXMax() + 1)) + (getXMax() - (x % (getXMax() + 1)))) ///< Convert x coord to linear coord
#define Y2ROW(x, y) (ROW_SIZE - (y % ROW_SIZE) - 1)    ///< Convert y coord to linear coord

#define CHAR_SPACING_DEFAULT 1  ///< Default number of pixels between characters