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#include "SPI.h"
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9341.h"
#include "XPT2046_Touchscreen.h"
#include "Math.h"
 
// For the Adafruit shield, these are the default.
#define TFT_CS 10
#define TFT_DC 9
#define TFT_MOSI 11
#define TFT_CLK 13
#define TFT_RST 8
#define TFT_MISO 12
 
#define TS_CS 7
 
#define ROTATION 3
 
 
// Use hardware SPI (on Uno, #13, #12, #11) and the above for CS/DC/RST
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);
XPT2046_Touchscreen ts(TS_CS);
 
// calibration values
float xCalM = 0.0, yCalM = 0.0; // gradients
float xCalC = 0.0, yCalC = 0.0; // y axis crossing points
 
int8_t blockWidth = 20; // block size
int8_t blockHeight = 20;
int16_t blockX = 0, blockY = 0; // block position (pixels)
 
class ScreenPoint {
public:
int16_t x;
int16_t y;
 
// default constructor
ScreenPoint(){
}
 
ScreenPoint(int16_t xIn, int16_t yIn){
x = xIn;
y = yIn;
}
};
 
ScreenPoint getScreenCoords(int16_t x, int16_t y){
int16_t xCoord = round((x * xCalM) + xCalC);
int16_t yCoord = round((y * yCalM) + yCalC);
if(xCoord < 0) xCoord = 0;
if(xCoord >= tft.width()) xCoord = tft.width() - 1;
if(yCoord < 0) yCoord = 0;
if(yCoord >= tft.height()) yCoord = tft.height() - 1;
return(ScreenPoint(xCoord, yCoord));
}
 
void calibrateTouchScreen(){
TS_Point p;
int16_t x1,y1,x2,y2;
 
tft.fillScreen(ILI9341_BLACK);
// wait for no touch
while(ts.touched());
tft.drawFastHLine(10,20,20,ILI9341_RED);
tft.drawFastVLine(20,10,20,ILI9341_RED);
while(!ts.touched());
delay(50);
p = ts.getPoint();
x1 = p.x;
y1 = p.y;
tft.drawFastHLine(10,20,20,ILI9341_BLACK);
tft.drawFastVLine(20,10,20,ILI9341_BLACK);
delay(500);
while(ts.touched());
tft.drawFastHLine(tft.width() - 30,tft.height() - 20,20,ILI9341_RED);
tft.drawFastVLine(tft.width() - 20,tft.height() - 30,20,ILI9341_RED);
while(!ts.touched());
delay(50);
p = ts.getPoint();
x2 = p.x;
y2 = p.y;
tft.drawFastHLine(tft.width() - 30,tft.height() - 20,20,ILI9341_BLACK);
tft.drawFastVLine(tft.width() - 20,tft.height() - 30,20,ILI9341_BLACK);
 
int16_t xDist = tft.width() - 40;
int16_t yDist = tft.height() - 40;
 
// translate in form pos = m x val + c
// x
xCalM = (float)xDist / (float)(x2 - x1);
xCalC = 20.0 - ((float)x1 * xCalM);
// y
yCalM = (float)yDist / (float)(y2 - y1);
yCalC = 20.0 - ((float)y1 * yCalM);
 
Serial.print("x1 = ");Serial.print(x1);
Serial.print(", y1 = ");Serial.print(y1);
Serial.print("x2 = ");Serial.print(x2);
Serial.print(", y2 = ");Serial.println(y2);
Serial.print("xCalM = ");Serial.print(xCalM);
Serial.print(", xCalC = ");Serial.print(xCalC);
Serial.print("yCalM = ");Serial.print(yCalM);
Serial.print(", yCalC = ");Serial.println(yCalC);
 
}
int backLight = 4;
 
void setup() {
digitalWrite(backLight, LOW);
pinMode(backLight, OUTPUT);
Serial.begin(9600);
// avoid chip select contention
pinMode(TS_CS, OUTPUT);
digitalWrite(TS_CS, HIGH);
pinMode(TFT_CS, OUTPUT);
digitalWrite(TFT_CS, HIGH);
 
tft.begin();
tft.setRotation(ROTATION);
tft.fillScreen(ILI9341_BLACK);
ts.begin();
ts.setRotation(ROTATION);
digitalWrite(backLight, HIGH);
calibrateTouchScreen();
 
}
 
void moveBlock(){
int16_t newBlockX, newBlockY;
ScreenPoint sp = ScreenPoint();
if (ts.touched()) {
TS_Point p = ts.getPoint();
sp = getScreenCoords(p.x, p.y);
newBlockX = sp.x - (blockWidth / 2);
newBlockY = sp.y - (blockHeight / 2);
if (newBlockX < 0) newBlockX = 0;
if (newBlockX >= (tft.width() - blockWidth)) newBlockX = tft.width() - 1 - blockWidth;
if (newBlockY < 0) newBlockY = 0;
if (newBlockY >= (tft.height() - blockHeight)) newBlockY = tft.height() - 1 - blockHeight;
}
if ((abs(newBlockX - blockX) > 2) || (abs(newBlockY - blockY) > 2)){
tft.fillRect(blockX, blockY, blockWidth, blockHeight,ILI9341_BLACK);
blockX = newBlockX;
blockY = newBlockY;
tft.fillRect(blockX, blockY, blockWidth, blockHeight,ILI9341_RED);
}
}
 
unsigned long lastFrame = millis();
 
void loop(void) {
 
// limit frame rate
while((millis() - lastFrame) < 20);
lastFrame = millis();
 
if (ts.touched()) {
moveBlock();
}
 
}