/*
   There are four different methods of plotting anti-aliased fonts to the screen.
 
   This sketch uses method 3, the font characters are first plotted in a Sprite, then the
   Sprite is pushed to the screen. This method is very flexible and the Sprite can be
   created, deleted, resized as needed. To render anti-aliased fonts well the Sprite
   needs to be 16 bit.  The fonts will render in 1 bit per pixel sprites but there
   will then be no anti-aliasing. Using 1 bit per pixel Sprites is however useful
   to use the extended Unicode range in fonts on mono displays like ePaper.
 
   A single Sprite can be re-used for plotting different values and graphics to
   different positions on the screen. This makes this method a very powerful display tool,
   for example round buttons can be created, making use of transparent colour plotting.
   
 */
 //  The fonts used are in the sketch data folder, press Ctrl+K to view.
 
 //  Upload the fonts and icons to SPIFFS (must set at least 1M for SPIFFS) using the
 //  "Tools"  "ESP8266 (or ESP32) Sketch Data Upload" menu option in the IDE.
 //  To add this option follow instructions here for the ESP8266:
 //  https://github.com/esp8266/arduino-esp8266fs-plugin
 //  or for the ESP32:
 //  https://github.com/me-no-dev/arduino-esp32fs-plugin
 
 //  Close the IDE and open again to see the new menu option.
 
 // A processing sketch to create new fonts can be found in the Tools folder of TFT_eSPI
 // https://github.com/Bodmer/TFT_eSPI/tree/master/Tools/Create_Smooth_Font/Create_font
 
 // This sketch uses font files created from the Noto family of fonts:
 // https://www.google.com/get/noto/
 
 #define AA_FONT_SMALL "NotoSansBold15"
 #define AA_FONT_LARGE "NotoSansBold36"
 #define AA_FONT_MONO  "NotoSansMonoSCB20" // NotoSansMono-SemiCondensedBold 20pt
 // Font files are stored in SPIFFS, so load the library
 #include <FS.h>
 
 #include <SPI.h>
 #include <TFT_eSPI.h>       // Hardware-specific library
 
 TFT_eSPI    tft = TFT_eSPI();
 TFT_eSprite spr = TFT_eSprite(&tft); // Sprite class needs to be invoked
 
 void setup(void) {
 
   Serial.begin(250000);
 
   tft.begin();
 
   tft.setRotation(1);
 
   spr.setColorDepth(16); // 16 bit colour needed to show anti aliased fonts
 
   if (!SPIFFS.begin()) {
     Serial.println("SPIFFS initialisation failed!");
     while (1) yield(); // Stay here twiddling thumbs waiting
   }
   Serial.println("\r\nSPIFFS available!");
 
   // ESP32 will crash if any of the fonts are missing
   bool font_missing = false;
   if (SPIFFS.exists("/NotoSansBold15.vlw")    == false) font_missing = true;
   if (SPIFFS.exists("/NotoSansBold36.vlw")    == false) font_missing = true;
   if (SPIFFS.exists("/NotoSansMonoSCB20.vlw") == false) font_missing = true;
 
   if (font_missing)
   {
     Serial.println("\r\nFont missing in SPIFFS, did you upload it?");
     while(1) yield();
   }
   else Serial.println("\r\nFonts found OK.");
 }
 
 void loop() {
 
   tft.fillScreen(TFT_DARKGREY);
 
   int xpos = tft.width() / 2; // Half the screen width
   int ypos = 50;
 
 
   // >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
   // Small font
   // >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
 
   spr.loadFont(AA_FONT_SMALL); // Must load the font first into the sprite class
 
   spr.createSprite(100, 50);   // Create a sprite 100 pixels wide and 50 high
 
   spr.fillSprite(TFT_BLUE);
 
   spr.drawRect(0, 0, 100, 50, TFT_WHITE); // Draw sprite border outline (so we see extent)
 
   spr.setTextColor(TFT_YELLOW, TFT_DARKGREY); // Set the sprite font colour and the background colour
 
   spr.setTextDatum(MC_DATUM); // Middle Centre datum
   
   spr.drawString("15pt font", 50, 25 ); // Coords of middle of 100 x 50 Sprite
 
   spr.pushSprite(10, 10); // Push to TFT screen coord 10, 10
 
   spr.pushSprite(10, 70, TFT_BLUE); // Push to TFT screen, TFT_BLUE is transparent
  
   spr.unloadFont(); // Remove the font from sprite class to recover memory used
 
   delay(4000);
 
   // >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
   // Large font
   // >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
 
   tft.fillScreen(TFT_BLACK);
 
   // Beware: Sprites are a different "class" to TFT, so different fonts can be loaded
   // in the tft and sprite instances, so load the font in the class instance you use!
   // In this example this means the spr. instance.
 
   spr.loadFont(AA_FONT_LARGE); // Load another different font into the sprite instance
 
   // 100 x 50 sprite was created above and still exists...
 
   spr.fillSprite(TFT_GREEN);
 
   spr.setTextColor(TFT_BLACK, TFT_GREEN); // Set the font colour and the background colour
 
   spr.setTextDatum(MC_DATUM); // Middle Centre datum
 
   spr.drawString("Fits", 50, 25); // Make sure text fits in the Sprite!
   spr.pushSprite(10, 10);         // Push to TFT screen coord 10, 10
 
   spr.fillSprite(TFT_RED);
   spr.setTextColor(TFT_WHITE, TFT_RED); // Set the font colour and the background colour
 
   spr.drawString("Too big", 50, 25); // Text is too big to all fit in the Sprite!
   spr.pushSprite(10, 70);            // Push to TFT screen coord 10, 70
 
   // Draw changing numbers - no flicker using this plot method!
 
   // >>>> Note: it is best to use drawNumber() and drawFloat() for numeric values <<<<
   // >>>> this reduces digit position movement when the value changes             <<<<
   // >>>> drawNumber() and drawFloat() functions behave like drawString() and are <<<<
   // >>>> supported by setTextDatum() and setTextPadding()                        <<<<
 
   spr.setTextDatum(TC_DATUM); // Top Centre datum
 
   spr.setTextColor(TFT_WHITE, TFT_BLUE); // Set the font colour and the background colour
 
   for (int i = 0; i <= 200; i++) {
     spr.fillSprite(TFT_BLUE);
     spr.drawFloat(i / 100.0, 2, 50, 10); // draw with 2 decimal places at 50,10 in sprite
     spr.pushSprite(10, 130); // Push to TFT screen coord 10, 130
     delay (20);
   }
 
   spr.unloadFont(); // Remove the font to recover memory used
 
   spr.deleteSprite(); // Recover memory
   
   delay(1000);
 
   // >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
   // Mono spaced font
   // >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
   
   spr.loadFont(AA_FONT_MONO); // Mono spaced fonts have fixed inter-character gaps to
                               // aid formatting
   int bnum = 1;
 
   // Example of drawing buttons
   for (int j = 0; j < 4; j++)
   {
     for (int k = 0; k < 4; k++)
     {
       int x = 120 + k * 45;
       int y = 40  + j * 30;
       button(x, y, bnum++);
     }
   }
 
   for (int i = 0; i < 100; i++)
   {
     button(120, 160, i);
     delay(50);
   }
   
   spr.unloadFont();
 
   delay(8000);
 }
 
 // #########################################################################
 // Draw a number in a rounded rectangle with some transparent pixels
 // Load the font before calling
 // #########################################################################
 void button(int x, int y, int num )
 {
 
   // Size of sprite
   #define IWIDTH  40
   #define IHEIGHT 25
 
   // Create a 16 bit sprite 40 pixels wide, 25 high (2000 bytes of RAM needed)
   spr.setColorDepth(16);
   spr.createSprite(IWIDTH, IHEIGHT);
 
   // Fill it with black (this will be the transparent colour this time)
   spr.fillSprite(TFT_BLACK);
 
   // Draw a background for the numbers
   spr.fillRoundRect(  0, 0,  IWIDTH, IHEIGHT, 8, TFT_RED);
   spr.drawRoundRect(  0, 0,  IWIDTH, IHEIGHT, 8, TFT_WHITE);
 
   // Set the font parameters
 
   // Set text coordinate datum to middle centre
   spr.setTextDatum(MC_DATUM);
 
   // Set the font colour and the background colour
   spr.setTextColor(TFT_WHITE, TFT_RED);
 
   // Draw the number
   spr.drawNumber(num, IWIDTH/2, 1 + IHEIGHT/2);
 
   // Push sprite to TFT screen CGRAM at coordinate x,y (top left corner)
   // All black pixels will not be drawn hence will show as "transparent"
   spr.pushSprite(x, y, TFT_BLACK);
 
   // Delete sprite to free up the RAM
   spr.deleteSprite();
 }

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