// demonstrates drawing and touch operations.
//
#include <Adafruit_GFX.h>
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_ILI9341.h>
#include <Adafruit_FT6206.h>
#define red_pot A0
#define green_pot A1
#define blue_pot A2
// The FT6206 uses hardware I2C (SCL/SDA)
Adafruit_FT6206 ts = Adafruit_FT6206();

#define TFT_CS 10
#define TFT_DC 9
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);
 
void setup(void)
{
  Serial.begin(9600);
  tft.begin();
  if (!ts.begin(40)) { 
    Serial.println("Unable to start touchscreen.");
  } 
  else { 
    Serial.println("Touchscreen started."); 
  }
  tft.fillScreen(ILI9341_WHITE);
  tft.setTextSize(2);
  
  // origin = left,top landscape (USB left upper)
 


}
//x 16bit       5bit    6bit      5bit
//color         red     green     blue  
uint32_t x = 0;

uint16_t temp = 0;
uint16_t last_x = 1;
void loop()
{

  temp = ((uint16_t)analogRead(red_pot))>>5;
  x = temp ;
  temp = ((uint16_t)analogRead(green_pot))>>4;
  x = (x<<6) + temp;
  temp = ((uint16_t)analogRead(blue_pot))>>5;
  x = (x<<5) + temp;
  if(x != last_x) // so not to waist time in these slow functions 
  {
    tft.setCursor( 0,20 );
    tft.setTextColor(x);
    tft.println("Drawing Color: ");
    tft.fillCircle(180, 22, 7, x);
    last_x = x;
  }

 

  
  
for(temp = 0 ; temp < 1000 ; temp++) // spend more time here than reading analog
{
  if (ts.touched())
  {   
    // Retrieve a point  
    TS_Point p = ts.getPoint(); 
    // rotate coordinate system
    // 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("touched");
    tft.fillCircle(p.x, p.y, 5, x);
  }
  delayMicroseconds(10);
}

  
}