/*
BY ARVIND PATIL INDIUA USING  CUSTAM CHIP  18/10/23
 The code you provided appears to be using the "Ucglib" library to control a graphics display. It sets colors and draws a gradient box, and then it prints some text. Let me break down the code step by step:

1. `ucg.setColor(0, 0, 40, 80);`
   - This line sets the color for "color index 0" to have RGB values (0, 40, 80). In this library, it's common to set a color palette with different indices.

2. `ucg.setColor(1, 80, 0, 40);`
   - This line sets the color for "color index 1" to have RGB values (80, 0, 40).

3. `ucg.setColor(2, 255, 0, 255);`
   - This line sets the color for "color index 2" to have RGB values (255, 0, 255).

4. `ucg.setColor(3, 0, 255, 255);`
   - This line sets the color for "color index 3" to have RGB values (0, 255, 255).

5. `ucg.drawGradientBox(0, 0, ucg.getWidth(), ucg.getHeight());`
   - This line draws a gradient box on the graphics display. The box appears to fill the 
   entire screen, as it uses `ucg.getWidth()` and `ucg.getHeight()` for its dimensions.
    The gradient might use the colors set in the previous lines.

6. `ucg.setColor(255, 168, 0);`
   - This line sets the current color to RGB (255, 168, 0), but it doesn't specify an 
   index. This means it sets the default color for subsequent operations.

7. `ucg.setPrintDir(0);`
   - This sets the print direction to 0, which likely means horizontal text.

8. `ucg.setPrintPos(2,18);`
   - This sets the print position to (2, 18), indicating where the next text will 
   be printed on the screen.

9. `ucg.print("Ucglib");`
   - This line prints the text "Ucglib" at the specified position (2, 18).

10. `ucg.setPrintPos(2, 18 + 20);`
    - This line sets a new print position, shifted vertically by 20 units from 
    the previous position.

11. `ucg.print("GraphicsTest");`
    - This line prints the text "GraphicsTest" at the new position, which is 20 units
     below the previous text.

12. `DLY();`
    - It seems like this is a function call, possibly a delay function, but without 
    the full context of your code, it's challenging to determine its exact purpose.

In summary, this code sets colors, draws a gradient box on the screen, and prints 
two lines of text with specific colors and positions on a graphics display controlled
 by the Ucglib library. The code is part of a broader program, and its exact behavior 
 may depend on the
 overall context.


*/

#include <SPI.h>
#include "Ucglib.h"

/*
  Hardware SPI Pins:
    Arduino Uno		sclk=13, data=11
    
    
  >>> Please uncomment (and update) one of the following constructors. <<<  
*/

//Ucglib_ILI9163_18x128x128_SWSPI ucg(/*sclk=*/ 7, /*data=*/ 6, /*cd=*/ 5, /*cs=*/ 3, /*reset=*/ 4);
//Ucglib_ILI9163_18x128x128_HWSPI ucg(/*cd=*/ 9, /*cs=*/ 10, /*reset=*/ 8);	/* HW SPI Adapter */

//Ucglib_ILI9341_18x240x320_SWSPI ucg(/*sclk=*/ 7, /*data=*/ 6, /*cd=*/ 5, /*cs=*/ 3, /*reset=*/ 4);
//Ucglib_ILI9341_18x240x320_SWSPI ucg(/*sclk=*/ 13, /*data=*/ 11, /*cd=*/ 9, /*cs=*/ 10, /*reset=*/ 8);
//Ucglib_ILI9341_18x240x320_HWSPI ucg(/*cd=*/ 9, /*cs=*/ 10, /*reset=*/ 8);
//Ucglib_ILI9341_18x240x320_SWSPI ucg(/*sclk=*/ 4, /*data=*/ 3, /*cd=*/ 6, /*cs=*/ 7, /*reset=*/ 5);	/* Elec Freaks Shield */



Ucglib_ILI9163_18x128x128_SWSPI ucg(/*sclk=*/ 13, /*data=*/ 11, /*cd=*/ 5, /*cs=*/ 4, /*reset=*/ 3);
//Ucglib_ILI9163_18x128x128_HWSPI ucg(/*cd=*/ 9, /*cs=*/ 10, /*reset=*/ 8);	/* HW SPI Adapter */


#define T 4000
#define DLY() delay(2000)

/*
  Linear Congruential Generator (LCG)
  z = (a*z + c) % m;  
  m = 256 (8 Bit)
  
  for period:
  a-1: dividable by 2
  a-1: multiple of 4
  c: not dividable by 2
  
  c = 17
  a-1 = 64 --> a = 65
*/
uint8_t z = 127;	// start value
uint32_t lcg_rnd(void) {
  z = (uint8_t)((uint16_t)65*(uint16_t)z + (uint16_t)17);
  return (uint32_t)z;
}


void ucglib_graphics_test(void)
{
  //ucg.setMaxClipRange();
  ucg.setColor(0, 0, 40, 80);
  ucg.setColor(1, 80, 0, 40);
  ucg.setColor(2, 255, 0, 255);
  ucg.setColor(3, 0, 255, 255);
  
  ucg.drawGradientBox(0, 0, ucg.getWidth(), ucg.getHeight());

  ucg.setColor(255, 168, 0);
  ucg.setPrintDir(0);
  ucg.setPrintPos(2,18);
  ucg.print("Ucglib");
  ucg.setPrintPos(2,18+20);
  ucg.print("GraphicsTest");

  DLY();
}

void gradient(void)
{  
  ucg.setColor(0, 0, 255, 0);
  ucg.setColor(1, 255, 0, 0);
  ucg.setColor(2, 255, 0, 255);
  ucg.setColor(3, 0, 255, 255);
  ucg.setColor(4, 0, 0, 255);

  ucg.drawGradientBox(0, 0, ucg.getWidth(), ucg.getHeight());
  
  ucg.setColor(255, 255, 255);
  ucg.setPrintPos(2,18);
  ucg.setPrintDir(0);
  ucg.print("GradientBox");

  ucg.setColor(0, 0, 255, 0);
  ucg.drawBox(2, 25, 8, 8);

  ucg.setColor(0, 255, 0, 0);
  ucg.drawBox(2+10, 25, 8, 8);

  ucg.setColor(0, 255, 0, 255);
  ucg.drawBox(2, 25+10, 8, 8);

  ucg.setColor(0, 0, 255, 255);
  ucg.drawBox(2+10, 25+10, 8, 8);

  DLY();
}

void box(void)
{
  ucg_int_t x, y, w, h;
  unsigned long m;
  
  ucg.setColor(0, 0, 40, 80);
  ucg.setColor(1, 60, 0, 40);
  ucg.setColor(2, 128, 0, 140);
  ucg.setColor(3, 0, 128, 140);  
  ucg.drawGradientBox(0, 0, ucg.getWidth(), ucg.getHeight());

  ucg.setColor(255, 255, 255);
  ucg.setPrintPos(2,18);
  ucg.setPrintDir(0);
  ucg.print("Box");

  m = millis() + T;

  while( millis() < m )
  {
    ucg.setColor((lcg_rnd()&127)+127, (lcg_rnd()&127)+64, lcg_rnd() & 31);
    w = lcg_rnd() & 31;
    h = lcg_rnd() & 31;
    w += 10;
    h += 10;
    x = (lcg_rnd()*(ucg.getWidth()-w))>>8;
    y = (lcg_rnd()*(ucg.getHeight()-h-20))>>8;
    
    ucg.drawBox(x, y+20, w, h);
  }

}

void pixel_and_lines(void)
{
  ucg_int_t mx;
  ucg_int_t x, xx;
  mx = ucg.getWidth() / 2;
  //my = ucg.getHeight() / 2;
  
  ucg.setColor(0, 0, 0, 150);
  ucg.setColor(1, 0, 60, 40);
  ucg.setColor(2, 60, 0, 40);
  ucg.setColor(3, 120, 120, 200);  
  ucg.drawGradientBox(0, 0, ucg.getWidth(), ucg.getHeight());

  ucg.setColor(255, 255, 255);
  ucg.setPrintPos(2,18);
  ucg.setPrintDir(0);
  ucg.print("Pix&Line");

  ucg.drawPixel(0, 0);
  ucg.drawPixel(1, 0);
  //ucg.drawPixel(ucg.getWidth()-1, 0);
  //ucg.drawPixel(0, ucg.getHeight()-1);
  
  ucg.drawPixel(ucg.getWidth()-1, ucg.getHeight()-1);
  ucg.drawPixel(ucg.getWidth()-1-1, ucg.getHeight()-1);

  
  for( x = 0; x  < mx; x++ )
  {
    xx = (((uint16_t)x)*255)/mx;
    ucg.setColor(255, 255-xx/2, 255-xx);
    ucg.drawPixel(x, 24);
    ucg.drawVLine(x+7, 26, 13);
  }

  DLY();
}

void color_test(void)
{
  ucg_int_t mx;
  uint16_t c, x;
  mx = ucg.getWidth() / 2;
  //my = ucg.getHeight() / 2;
  
  ucg.setColor(0, 0, 0, 0);
  ucg.drawBox(0, 0, ucg.getWidth(), ucg.getHeight());

  ucg.setColor(255, 255, 255);
  ucg.setPrintPos(2,18);
  ucg.setPrintDir(0);
  ucg.print("Color Test");

  ucg.setColor(0, 127, 127, 127);
  ucg.drawBox(0, 20, 16*4+4, 5*8+4);

  for( c = 0, x = 2; c <= 255; c+=17, x+=4 )
  {
    ucg.setColor(0, c, c, c);
    ucg.drawBox(x, 22, 4, 8);
    ucg.setColor(0, c, 0, 0);
    ucg.drawBox(x, 22+8, 4, 8);
    ucg.setColor(0, 0, c, 0);
    ucg.drawBox(x, 22+2*8, 4, 8);
    ucg.setColor(0, 0, 0, c);
    ucg.drawBox(x, 22+3*8, 4, 8);
    ucg.setColor(0, c, 255-c, 0);
    ucg.drawBox(x, 22+4*8, 4, 8);
    
  }

  DLY();
}



void cross(void)
{
  ucg_int_t mx, my;
  ucg.setColor(0, 250, 0, 0);
  ucg.setColor(1, 255, 255, 30);
  ucg.setColor(2, 220, 235, 10);
  ucg.setColor(3, 205, 0, 30);
  ucg.drawGradientBox(0, 0, ucg.getWidth(), ucg.getHeight());
  mx = ucg.getWidth() / 2;
  my = ucg.getHeight() / 2;

  ucg.setColor(0, 255, 255, 255);
  ucg.setPrintPos(2,18);
  ucg.print("Cross");

  ucg.setColor(0, 0, 0x66, 0xcc);
  ucg.setPrintPos(mx+15,my-5);
  ucg.print("dir0");
  ucg.setPrintPos(mx+5,my+26);
  ucg.print("dir1");
  ucg.setPrintPos(mx-40,my+20);
  ucg.print("dir2");
  ucg.setPrintPos(mx+5,my-25);
  ucg.print("dir3");

  ucg.setColor(0, 0, 0x66, 0xff);
  ucg.setColor(1, 0, 0x66, 0xcc);
  ucg.setColor(2, 0, 0, 0x99);

  ucg_Draw90Line(ucg.getUcg(), mx+2, my-1, 20, 0, 0);
  ucg_Draw90Line(ucg.getUcg(), mx+2, my, 20, 0, 1);
  ucg_Draw90Line(ucg.getUcg(), mx+2, my+1, 20, 0, 2);

  ucg_Draw90Line(ucg.getUcg(), mx+1, my+2, 20, 1, 0);
  ucg_Draw90Line(ucg.getUcg(), mx, my+2, 20, 1, 1);
  ucg_Draw90Line(ucg.getUcg(), mx-1, my+2, 20, 1, 2);

  ucg_Draw90Line(ucg.getUcg(), mx-2, my+1, 20, 2, 0);
  ucg_Draw90Line(ucg.getUcg(), mx-2, my, 20, 2, 1);
  ucg_Draw90Line(ucg.getUcg(), mx-2, my-1, 20, 2, 2);

  ucg_Draw90Line(ucg.getUcg(), mx-1, my-2, 20, 3, 0);
  ucg_Draw90Line(ucg.getUcg(), mx, my-2, 20, 3, 1);
  ucg_Draw90Line(ucg.getUcg(), mx+1, my-2, 20, 3, 2);

  DLY();
}

void triangle(void)
{
  unsigned long m;
  
  ucg.setColor(0, 0, 80, 20);
  ucg.setColor(1, 60, 80, 20);
  ucg.setColor(2, 60, 120, 0);
  ucg.setColor(3, 0, 140, 30);  
  ucg.drawGradientBox(0, 0, ucg.getWidth(), ucg.getHeight());

  ucg.setColor(255, 255, 255);
  ucg.setPrintPos(2,18);
  ucg.print("Triangle");

  m = millis() + T;

  while( millis() < m )
  {
    ucg.setColor((lcg_rnd()&127)+127, lcg_rnd() & 31, (lcg_rnd()&127)+64);
    
    ucg.drawTriangle(
      (lcg_rnd()*(ucg.getWidth()))>>8,
      ((lcg_rnd()*(ucg.getHeight()-20))>>8)+20,
      (lcg_rnd()*(ucg.getWidth()))>>8,
      ((lcg_rnd()*(ucg.getHeight()-20))>>8)+20,
      (lcg_rnd()*(ucg.getWidth()))>>8,
      ((lcg_rnd()*(ucg.getHeight()-20))>>8)+20
    );
    
  }

}

void text(void)
{
  ucg_int_t x, y, w, h, i;
  unsigned long m;
  
  ucg.setColor(0, 80, 40, 0);
  ucg.setColor(1, 60, 0, 40);
  ucg.setColor(2, 20, 0, 20);
  ucg.setColor(3, 60, 0, 0);  
  ucg.drawGradientBox(0, 0, ucg.getWidth(), ucg.getHeight());

  ucg.setColor(255, 255, 255);
  ucg.setPrintPos(2,18);
  ucg.setPrintDir(0);
  ucg.print("Text");

  m = millis() + T;
  i = 0;
  while( millis() < m )
  {
    ucg.setColor(lcg_rnd() & 31, (lcg_rnd()&127)+127, (lcg_rnd()&127)+64);
    w = 40;
    h = 22;
    x = (lcg_rnd()*(ucg.getWidth()-w))>>8;
    y = (lcg_rnd()*(ucg.getHeight()-h))>>8;
    
    ucg.setPrintPos(x,y+h);
    ucg.setPrintDir((i>>2)&3);
    i++;
    ucg.print("Ucglib");
  }
  ucg.setPrintDir(0);

}

void fonts(void)
{
  ucg_int_t d = 5;
  ucg.setColor(0, 0, 40, 80);
  ucg.setColor(1, 150, 0, 200);
  ucg.setColor(2, 60, 0, 40);
  ucg.setColor(3, 0, 160, 160);
  
  ucg.drawGradientBox(0, 0, ucg.getWidth(), ucg.getHeight());

  ucg.setColor(255, 255, 255);
  ucg.setPrintDir(0);
  ucg.setPrintPos(2,18);
  ucg.print("Fonts");

  ucg.setFontMode(UCG_FONT_MODE_TRANSPARENT);

  ucg.setColor(255, 200, 170);
  ucg.setFont(ucg_font_helvB08_hr);
  ucg.setPrintPos(2,30+d);
  ucg.print("ABC abc 123");
  ucg.setFont(ucg_font_helvB10_hr);
  ucg.setPrintPos(2,45+d);
  ucg.print("ABC abc 123");
  ucg.setFont(ucg_font_helvB12_hr);
  //ucg.setPrintPos(2,62+d);
  //ucg.print("ABC abc 123");
  ucg.drawString(2,62+d, 0, "ABC abc 123"); // test drawString
  
  ucg.setFontMode(UCG_FONT_MODE_SOLID);

  ucg.setColor(255, 200, 170);
  ucg.setColor(1, 0, 100, 120);		// background color in solid mode
  ucg.setFont(ucg_font_helvB08_hr);
  ucg.setPrintPos(2,75+30+d);
  ucg.print("ABC abc 123");
  ucg.setFont(ucg_font_helvB10_hr);
  ucg.setPrintPos(2,75+45+d);
  ucg.print("ABC abc 123");
  ucg.setFont(ucg_font_helvB12_hr);
  ucg.setPrintPos(2,75+62+d);
  ucg.print("ABC abc 123");

  ucg.setFontMode(UCG_FONT_MODE_TRANSPARENT);

  /* big fonts removed, some trouble with the Arduino IDE */
  /*
  ucg.setFont(ucg_font_helvB14_hr);
  ucg.setPrintPos(2,79+d);
  ucg.print("ABC abc 123");
  ucg.setFont(ucg_font_helvB18_hr);
  ucg.setPrintPos(2,79+22+d);
  ucg.print("ABC abc 123");
  */
  
  ucg.setFont(ucg_font_ncenR14_hr);
  DLY();
}

void clip(void)
{
  ucg.setColor(0, 0x00, 0xd1, 0x5e);		// dark green
  ucg.setColor(1, 0xff, 0xf7, 0x61);		// yellow
  ucg.setColor(2, 0xd1, 0xc7, 0x00);			// dark yellow
  ucg.setColor(3, 0x61, 0xff, 0xa8);		// green
  
  ucg.drawGradientBox(0, 0, ucg.getWidth(), ucg.getHeight());

  ucg.setColor(255, 255, 255);
  ucg.setPrintPos(2,18);
  ucg.setPrintDir(0);
  ucg.print("ClipRange");
  
  ucg.setColor(0xd1, 0x00, 0x073);
  
  ucg.setFont(ucg_font_helvB18_hr);
  
  ucg.setPrintPos(25,45);
  ucg.setPrintDir(0);
  ucg.print("Ucg");
  ucg.setPrintDir(1);
  ucg.print("Ucg");
  ucg.setPrintDir(2);
  ucg.print("Ucg");
  ucg.setPrintDir(3);
  ucg.print("Ucg");
  
  
  ucg.setMaxClipRange();
  ucg.setColor(0xff, 0xff, 0xff);
  ucg.drawFrame(20-1,30-1,15+2,20+2);  
  ucg.setClipRange(20, 30, 15, 20);
  ucg.setColor(0xff, 0x61, 0x0b8);
  ucg.setPrintPos(25,45);
  ucg.setPrintDir(0);
  ucg.print("Ucg");
  ucg.setPrintDir(1);
  ucg.print("Ucg");
  ucg.setPrintDir(2);
  ucg.print("Ucg");
  ucg.setPrintDir(3);
  ucg.print("Ucg");
  

  ucg.setMaxClipRange();
  ucg.setColor(0xff, 0xff, 0xff);
  ucg.drawFrame(60-1,35-1,25+2,18+2);  
  ucg.setClipRange(60, 35, 25, 18);
  ucg.setColor(0xff, 0x61, 0x0b8);
  ucg.setPrintPos(25,45);
  ucg.setPrintDir(0);
  ucg.print("Ucg");
  ucg.setPrintDir(1);
  ucg.print("Ucg");
  ucg.setPrintDir(2);
  ucg.print("Ucg");
  ucg.setPrintDir(3);
  ucg.print("Ucg");

  ucg.setMaxClipRange();
  ucg.setColor(0xff, 0xff, 0xff);
  ucg.drawFrame(7-1,58-1,90+2,4+2);  
  ucg.setClipRange(7, 58, 90, 4);
  ucg.setColor(0xff, 0x61, 0x0b8);
  ucg.setPrintPos(25,45);
  ucg.setPrintDir(0);
  ucg.print("Ucg");
  ucg.setPrintDir(1);
  ucg.print("Ucg");
  ucg.setPrintDir(2);
  ucg.print("Ucg");
  ucg.setPrintDir(3);
  ucg.print("Ucg");

  ucg.setFont(ucg_font_ncenR14_hr);
  ucg.setMaxClipRange();
  DLY();
  
}

void setup(void)
{
  delay(1000);
  ucg.begin(UCG_FONT_MODE_TRANSPARENT);
  ucg.setFont(ucg_font_ncenR14_hr);
  ucg.clearScreen();
}

void set_clip_range(void)
{
  ucg_int_t x, y, w, h;
  w = lcg_rnd() & 31;
  h = lcg_rnd() & 31;
  w += 25;
  h += 25;
  x = (lcg_rnd()*(ucg.getWidth()-w))>>8;
  y = (lcg_rnd()*(ucg.getHeight()-h))>>8;
  
  ucg.setClipRange(x, y, w, h);
}


uint8_t r = 0;
void loop(void)
{
  switch(r&3)
  {
    case 0: ucg.undoRotate(); break;
    case 1: ucg.setRotate90(); break;
    case 2: ucg.setRotate180(); break;
    default: ucg.setRotate270(); break;
  }
  
  if ( r > 3 )
  {
    ucg.clearScreen();
    set_clip_range();
  }
  
  r++;
  ucglib_graphics_test();
  cross();
  pixel_and_lines();
  color_test();
  triangle();
  fonts();  
  text();
  if ( r <= 3 )
    clip();
  box();
  gradient();
  //ucg.clearScreen();
  DLY();
  ucg.setMaxClipRange();
}