// Test in Wokwi with 5110 display and U8glib library.
//
// Pin order on the display: 
//   RST, CS(SCE), DC(A0), Data(MOSI), CLK, Vcc, backlight, GND
// When using an Arduino Uno, resistors should be used.
//   From RST up to CLK with 10k resistor.
//   VCC to 3.3V.
//   GND to GND.
//   Backlight with 330 ohm to 3.3V.
//
// Both hardware SPI and software SPI are possible.
// SPI Com: SCK = 13, MOSI = 11, CS = 10, A0 = 9, Reset = 8
// U8GLIB_PCD8544 u8g(13, 11, 10, 9, 8);   
//
// Example from U8glib library

/*

  GraphicsTest.pde

  >>> Before compiling: Please remove comment from the constructor of the
  >>> connected graphics display (see below).

  Universal 8bit Graphics Library, http://code.google.com/p/u8glib/

  Copyright (c) 2012, olikraus@gmail.com
  All rights reserved.

  Redistribution and use in source and binary forms, with or without modification,
  are permitted provided that the following conditions are met:

    Redistributions of source code must retain the above copyright notice, this list
    of conditions and the following disclaimer.

    Redistributions in binary form must reproduce the above copyright notice, this
    list of conditions and the following disclaimer in the documentation and/or other
    materials provided with the distribution.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/


#include <U8glib.h>

U8GLIB_PCD8544 u8g(13, 11, 10, 9, 8); // SPI bus: SCK, MOSI, CS, A0, Reset

void u8g_prepare(void) {
  u8g.setFont(u8g_font_6x10);
  u8g.setFontRefHeightExtendedText();
  u8g.setDefaultForegroundColor();
  u8g.setFontPosTop();
}

void u8g_box_frame(uint8_t a) {
  u8g.drawStr( 0, 0, "drawBox");
  u8g.drawBox(5, 10, 20, 10);
  u8g.drawBox(10 + a, 15, 30, 7);
  u8g.drawStr( 0, 30, "drawFrame");
  u8g.drawFrame(5, 10 + 30, 20, 10);
  u8g.drawFrame(10 + a, 15 + 30, 30, 7);
}

void u8g_disc_circle(uint8_t a) {
  u8g.drawStr( 0, 0, "drawDisc");
  u8g.drawDisc(10, 18, 9);
  u8g.drawDisc(24 + a, 16, 7);
  u8g.drawStr( 0, 30, "drawCircle");
  u8g.drawCircle(10, 18 + 30, 9);
  u8g.drawCircle(24 + a, 16 + 30, 7);
}

void u8g_r_frame(uint8_t a) {
  u8g.drawStr( 0, 0, "drawRFrame/Box");
  u8g.drawRFrame(5, 10, 40, 30, a + 1);
  u8g.drawRBox(50, 10, 25, 40, a + 1);
}

void u8g_string(uint8_t a) {
  u8g.drawStr(30 + a, 31, " 0");
  u8g.drawStr90(30, 31 + a, " 90");
  u8g.drawStr180(30 - a, 31, " 180");
  u8g.drawStr270(30, 31 - a, " 270");
}

void u8g_line(uint8_t a) {
  u8g.drawStr( 0, 0, "drawLine");
  u8g.drawLine(7 + a, 10, 40, 55);
  u8g.drawLine(7 + a * 2, 10, 60, 55);
  u8g.drawLine(7 + a * 3, 10, 80, 55);
  u8g.drawLine(7 + a * 4, 10, 100, 55);
}

void u8g_triangle(uint8_t a)
{
  uint16_t offset = a;
  u8g.drawStr( 0, 0, "drawTriangle");
  u8g.drawTriangle(14, 7, 45, 30, 10, 40);
  u8g.drawTriangle(14 + offset, 7 - offset, 45 + offset, 30 - offset, 57 + offset, 10 - offset);
  u8g.drawTriangle(57 + offset * 2, 10, 45 + offset * 2, 30, 86 + offset * 2, 53);
  u8g.drawTriangle(10 + offset, 40 + offset, 45 + offset, 30 + offset, 86 + offset, 53 + offset);
}

void u8g_ascii_1()
{
  char s[2] = " ";
  uint8_t x, y;
  u8g.drawStr( 0, 0, "ASCII page 1");
  for ( y = 0; y < 6; y++ )
  {
    for ( x = 0; x < 16; x++ )
    {
      s[0] = y * 16 + x + 32;
      u8g.drawStr(x * 7, y * 10 + 10, s);
    }
  }
}

void u8g_ascii_2() {
  char s[2] = " ";
  uint8_t x, y;
  u8g.drawStr( 0, 0, "ASCII page 2");
  for ( y = 0; y < 6; y++ ) {
    for ( x = 0; x < 16; x++ ) {
      s[0] = y * 16 + x + 160;
      u8g.drawStr(x * 7, y * 10 + 10, s);
    }
  }
}

void u8g_extra_page(uint8_t a)
{
  if ( u8g.getMode() == U8G_MODE_HICOLOR || u8g.getMode() == U8G_MODE_R3G3B2)
  {
    /* draw background (area is 128x128) */
    u8g_uint_t r, g, b;
    b = a << 5;
    for ( g = 0; g < 64; g++ )
    {
      for ( r = 0; r < 64; r++ )
      {
        u8g.setRGB(r << 2, g << 2, b );
        u8g.drawPixel(g, r);
      }
    }
    u8g.setRGB(255, 255, 255);
    u8g.drawStr( 66, 0, "Color Page");
  }
  else if ( u8g.getMode() == U8G_MODE_GRAY2BIT )
  {
    u8g.drawStr( 66, 0, "Gray Level");
    u8g.setColorIndex(1);
    u8g.drawBox(0, 4, 64, 32);
    u8g.drawBox(70, 20, 4, 12);
    u8g.setColorIndex(2);
    u8g.drawBox(0 + 1 * a, 4 + 1 * a, 64 - 2 * a, 32 - 2 * a);
    u8g.drawBox(74, 20, 4, 12);
    u8g.setColorIndex(3);
    u8g.drawBox(0 + 2 * a, 4 + 2 * a, 64 - 4 * a, 32 - 4 * a);
    u8g.drawBox(78, 20, 4, 12);
  }
  else
  {
    u8g.drawStr( 0, 12, "setScale2x2");
    u8g.setScale2x2();
    u8g.drawStr( 0, 6 + a, "setScale2x2");
    u8g.undoScale();
  }
}

uint8_t draw_state = 0;

void draw(void)
{
  u8g_prepare();
  switch (draw_state >> 3)
  {
    case 0: u8g_box_frame(draw_state & 7); break;
    case 1: u8g_disc_circle(draw_state & 7); break;
    case 2: u8g_r_frame(draw_state & 7); break;
    case 3: u8g_string(draw_state & 7); break;
    case 4: u8g_line(draw_state & 7); break;
    case 5: u8g_triangle(draw_state & 7); break;
    case 6: u8g_ascii_1(); break;
    case 7: u8g_ascii_2(); break;
    case 8: u8g_extra_page(draw_state & 7); break;
  }
}

void setup(void)
{
  // flip screen, if required
  //u8g.setRot180();

  pinMode(13, OUTPUT);
  digitalWrite(13, HIGH);

  u8g.setContrast(142);
}

void loop(void)
{
  u8g.firstPage();
  do {
    // simple grid
    for (int i = 0; i < 48; i += 5) {
      u8g.drawLine(0, i, 84, i);
    }
    for (int i = 0; i < 84; i += 5) {
      u8g.drawLine(i, 0, i, 48);
    }
  } while ( u8g.nextPage() );

  // rebuild the picture after some delay
  delay(5000);
}