/**
  First demo for FT6206 Capactive Touch Screen on Wokwi. Enjoy!

  https://wokwi.com/arduino/projects/311598148845830720
 */

/***************************************************
  This is our touchscreen painting example for the Adafruit ILI9341
  captouch shield
  ----> http://www.adafruit.com/products/1947

  Check out the links above for our tutorials and wiring diagrams

  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing
  products from Adafruit!

  Written by Limor Fried/Ladyada for Adafruit Industries.
  MIT license, all text above must be included in any redistribution
 ****************************************************/


#include <Adafruit_GFX.h>    // Core graphics library
#include <SPI.h>       // this is needed for display
#include <Adafruit_ILI9341.h>
#include <Wire.h>      // this is needed for FT6206
#include <Adafruit_FT6206.h>

// The FT6206 uses hardware I2C (SCL/SDA)
Adafruit_FT6206 ctp = Adafruit_FT6206();

// The display also uses hardware SPI, plus #9 & #10
#define TFT_CS 10
#define TFT_DC 9
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);



void setup(void) {
  while (!Serial);     // used for leonardo debugging
 
  Serial.begin(115200);
  Serial.println(F("Cap Touch Paint!"));
  
  tft.begin();

  if (! ctp.begin(40)) {  // pass in 'sensitivity' coefficient
    Serial.println("Couldn't start FT6206 touchscreen controller");
    while (1);
  }

  Serial.println("Capacitive touchscreen started");
  
  tft.fillScreen(ILI9341_BLACK);
}

void loop() {
  delay(10);
  swipe_RL();


  // Wait for a touch
 /* if (! ctp.touched()) {
    return;
  }*/

  // Retrieve a point  
  TS_Point p = ctp.getPoint();
  
 /*
  // Print out raw data from screen touch controller
  Serial.print("X = "); Serial.print(p.x);
  Serial.print("\tY = "); Serial.print(p.y);
  Serial.print(" -> ");
 */
  /*if (ctp.touched()) {
    // flip it around to match the screen.
    p.x = map(p.x, 0, 240, 240, 0);
    p.y = map(p.y, 0, 320, 320, 0);
    Serial.println(p.x);
    //Serial.println(p.y);
  }*/
}

byte swipe_RL() {
  TS_Point p;
  uint8_t x_touch;
  static bool swipe_flag = false;
  static uint8_t start_touch;
  static uint8_t end_touch;
  static unsigned long startMillis = 0; 
  if(ctp.touched()) {
    p = ctp.getPoint();
    p.x = map(p.x, 0, 240, 240, 0);
    p.y = map(p.y, 0, 320, 320, 0);
    x_touch = p.x;
  }
  if(!swipe_flag && ctp.touched()) {
    startMillis = millis(); 
    swipe_flag = true;
    start_touch = x_touch;
    //Serial.print("start_touch:");
    //Serial.println(start_touch);
  }
  if (!ctp.touched()) {
    end_touch = x_touch;
    if(swipe_flag) {
      //Serial.print("end_touch:");
      //Serial.println(end_touch);
      bool cmp_R = start_touch < end_touch;
      bool cmp_L = start_touch > end_touch;
      bool min_len = abs((start_touch - end_touch)) > 10;
      if(cmp_R && min_len) {
        start_touch = NULL;
        end_touch = NULL;
        swipe_flag = false;
        Serial.println("swipe right");
        return 1;
      }
      if(cmp_L && min_len) {
        start_touch = NULL;
        end_touch = NULL;
        swipe_flag = false;
        Serial.println("swipe left");
        return 2;
      }
      startMillis = millis();
    }
    swipe_flag = false;
    return 0;
  }
  if((millis() - startMillis) > 2000) {
        start_touch = NULL;
        end_touch = NULL;
        swipe_flag = false;
        startMillis = millis();
  }
}