/*

  Forum: https://forum.arduino.cc/t/best-way-to-print-letters-with-strikethrough/1355282
  Wokwi: https://wokwi.com/projects/423427538942706689

  2025-02-20
  ec2021

  Realization of a simple "Strike Through" function for TFT displays
  Text can wrap at the borders

*/

#include "SPI.h"
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9341.h"

#define TFT_DC 9
#define TFT_CS 10
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);


void setup() {
  tft.begin();
  tft.setRotation(0);
}


void loop() {
  for (int i = 1; i < 6; i++) {
    Print("Strike Through Strike Through", 10, 10, i, ILI9341_RED);
    delay(2000);
    tft.fillScreen(ILI9341_BLACK);
  }
}

void Print(char * txt, int atX, int atY, int tSize, uint16_t col) {
  tft.setCursor(atX, atY);
  tft.setTextColor(col);
  tft.setTextSize(tSize);
  tft.println(txt);
  int charHeight = getCharHeight();
  int height = getTotalTxtHeight(txt, atX, atY);
  int width  = getTotalTxtWidth(txt, atX, atY);
  int noOfLines = (height + 1) / charHeight;
  int i = 0;
  while (width > 0) {
    tft.drawFastHLine(atX, atY + charHeight / 2 + i * charHeight, width, col);
    width = width - (tft.width() - atX);
    atX = 0;
    i++;

  }
};


int getCharHeight() {
  int x, y, width, height;
  tft.getTextBounds("C", 0, 0, &x, &y, &width, &height);
  return height;
}

int getTotalTxtWidth(char * txt, int atX, int atY) {
  int boxX, boxY, width, height;
  tft.setTextWrap(false);
  tft.getTextBounds(txt, atX, atY, &boxX, &boxY, &width, &height);
  tft.setTextWrap(true);
  return width;
}

int getTotalTxtHeight(char * txt, int atX, int atY) {
  int boxX, boxY, width, height;
  tft.getTextBounds(txt, atX, atY, &boxX, &boxY, &width, &height);
  return height;
}