Calculator_TFT_Arduino.ino

#include <Adafruit_GFX.h> 
#include <MCUFRIEND_kbv.h>
MCUFRIEND_kbv tft; 
#include <TouchScreen.h>
#define MINPRESSURE 200
#define MAXPRESSURE 1000
//#include <Fonts/FreeSans9pt7b.h>

// ALL Touch panels and wiring is DIFFERENT
// copy-paste results from TouchScreen_Calibr_native.ino
const int XP = 6, XM = A2, YP = A1, YM = 7; //ID=0x9341
const int TS_LEFT=915,TS_RT=157,TS_TOP=914,TS_BOT=232;
TouchScreen ts = TouchScreen(XP, YP, XM, YM, 300);

#define BLACK 0x0000
#define BLUE 0x001F
#define RED 0xF800
#define GREEN 0x07E0
#define CYAN 0x07FF
#define MAGENTA 0xF81F
#define YELLOW 0xFFE0
#define WHITE 0xFFFF
#define BUTTON_X 30
#define BUTTON_Y 123
#define BUTTON_W 51
#define BUTTON_H 50
#define BUTTON_SPACING_X 07
#define BUTTON_SPACING_Y 07
#define BUTTON_TEXTSIZE 2

char buttonlabels[16][5] = { "1", "2", "3","+", "4", "5", "6","-", "7", "8", "9","/","=","0","DEL","x"};
uint16_t buttoncolors[16] = { CYAN,CYAN,CYAN,MAGENTA,CYAN,CYAN,CYAN,MAGENTA,CYAN,CYAN,CYAN,MAGENTA,GREEN,CYAN,RED,MAGENTA };
Adafruit_GFX_Button buttons[16];
int col=0,row=0,z=0, i, j;
#define TEXT_X 5
#define TEXT_Y 25
#define TEXT_W (tft.width()-10)
#define TEXT_H 70
#define TEXT_TSIZE 3
#define TEXT_TCOLOR BLUE
char q;
int presskey;
int pass;
float num1,num2;

int operator_type=0;
#define TEXT_LEN 10
char textfield[TEXT_LEN+1] = "";
uint8_t textfield_i=0;
float result=0;

TSPoint tp;
boolean n=false;
int nc;
float fn; //final number
#define TS_MINX 138
#define TS_MINY 236
#define TS_MAXX 772
#define TS_MAXY 869

void setup() {
Serial.begin(9600);
tft.reset();
uint16_t ID = tft.readID();
Serial.print("TFT ID = 0x");
Serial.println(ID, HEX);
Serial.println("Calibrate for your Touch Panel");
if (ID == 0xD3D3) ID = 0x9486; // write-only shield
tft.begin(ID);
tft.setRotation(0); //PORTRAIT
tft.fillScreen(WHITE);

//welcome screen
uint16_t width = tft.width() - 1;
uint16_t height = tft.height() - 1;
uint8_t border = 10;
tft.fillScreen(YELLOW);
tft.fillRect(border, border, (width - border * 2), (height - border * 2), WHITE); 
tft.setTextSize (3);
tft.setTextColor(RED);
tft.setCursor ((tft.width()/2)-85, 85);
tft.println("CALCULATOR");
tft.setCursor ((tft.width()/2)-85, 130);
tft.setTextSize (2);
tft.setTextColor(BLACK);
tft.println("Welcome Pranay");
tft.setCursor ((tft.width()/2)-95, 250);
tft.println("Touch to Proceed");
//wait for touch

do {
tp= ts.getPoint(); 
pinMode(XM, OUTPUT); //Pins configures again for TFT control
pinMode(YP, OUTPUT);
} while((tp.z < MINPRESSURE )|| (tp.z > MAXPRESSURE));

tp.x = map(tp.x, TS_LEFT, TS_RT, 0, tft.width());
tp.y = map(tp.y, TS_TOP, TS_BOT, 0, tft.height());

// round box calculator output screen
tft.fillScreen(WHITE);
tft.setCursor ((tft.width()/2)-60, 5);
tft.setTextSize (2);
tft.setTextColor(BLACK);
tft.println("CALCULATOR");
tft.drawRoundRect(TEXT_X, TEXT_Y, TEXT_W, TEXT_H, 10, BLACK);

// Button initialize
for(int i=0;i<4;i++)
{ for(int j=0;j<4;j++) {
row=i;col=j;

buttons[z].initButton(&tft, BUTTON_X+col*(BUTTON_W+BUTTON_SPACING_X), 
BUTTON_Y+row*(BUTTON_H+BUTTON_SPACING_Y), // x, y, w, h, outline, fill, text
BUTTON_W, BUTTON_H, BLACK, buttoncolors[z],BLACK,
buttonlabels[z], BUTTON_TEXTSIZE); 
buttons[z].drawButton();
z++; }
}

}

void loop() {
// wait for button press
do {
tp= ts.getPoint(); 
pinMode(XM, OUTPUT); //Pins configures again for TFT control
pinMode(YP, OUTPUT);
} while((tp.z < MINPRESSURE )|| (tp.z > MAXPRESSURE));

tp.x = map(tp.x, TS_LEFT, TS_RT, 0, tft.width());
tp.y = map(tp.y, TS_TOP, TS_BOT, 0, tft.height());

// clear results
if (n == true){
tft.setCursor(TEXT_X + 2, TEXT_Y+40);
tft.setTextColor(TEXT_TCOLOR, WHITE);
tft.setTextSize(TEXT_TSIZE);
tft.print(" ");
tft.setCursor(TEXT_X + 2, TEXT_Y+10);
tft.print(" ");
n = false;
}

//get the button
for (uint8_t b=0; b<16; b++) 
{ 
if (buttons[b].contains(tp.x, tp.y)) 
{
buttons[b].press(true); // tell the button it is pressed
q=b;
} 
else 
{
buttons[b].press(false); // tell the button it is NOT pressed
}
}
Serial.print("value of q: ");
Serial.println(q);

//which button is pressed & what to do
if(q == 3 || q==7 || q==11 || q== 12 || q==14 || q==15 ){ 
switch (q)
{
case 3: operator_type = 1; pressed_button();animate();display_text(); break;
case 7: operator_type = 2; pressed_button();animate();display_text(); break;
case 11: operator_type = 3; pressed_button();animate();display_text(); break;
case 12: pressed_button();animate(); break;
case 14: pressed_button();animate();clr_button(); break;
case 15: operator_type = 4; pressed_button();animate();display_text(); break;
}
}
else{
switch (q)
{
case 0: nc = 1; pressed_button();animate();display_text(); break;
case 1: nc = 2; pressed_button();animate();display_text(); break;
case 2: nc = 3; pressed_button();animate();display_text(); break;
case 4: nc = 4; pressed_button();animate();display_text(); break;
case 5: nc = 5; pressed_button();animate();display_text(); break;
case 6: nc = 6; pressed_button();animate();display_text(); break;
case 8: nc = 7; pressed_button();animate();display_text(); break;
case 9: nc = 8; pressed_button();animate();display_text(); break;
case 10: nc = 9; pressed_button();animate();display_text(); break;
case 13: nc = 0; pressed_button();animate();display_text(); break;
}
}

if (nc > 0 || q==13){
switch (presskey)
{ // you can add single number (num1/num2) upto 4 digits
case 0: fn = nc; break;
case 1: fn = fn*10 + nc; break;
case 2: fn = fn*10 + nc; break;
case 3: fn = fn*10+ nc; break;
}
Serial.print("presskey: ");
Serial.println (presskey);
nc=0;
presskey++;
delay(200);
}
if(q == 3 || q==7 || q==11 || q== 12 || q==15 ){
if (pass == 0){
presskey=0;
num1 = fn;
pass++;}
else if(pass == 1){
presskey=0;
num2 = fn;
} 
}

if (q==12){ 
switch (operator_type)
{
case 1:result=num1+num2;break;
case 2:result=num1-num2;break;
case 3:result=num1/num2;break;
case 4:result=num1*num2;break;

}
//display result
tft.setCursor(TEXT_X + 2, TEXT_Y+40);
tft.setTextColor(TEXT_TCOLOR, WHITE);
tft.setTextSize(TEXT_TSIZE);
tft.print('=');
tft.print(result);

q=0;
num1 = 0;
num2 = 0;
pass =0;
nc=0; 
fn=0;
result=0;
operator_type=0; 
char textfield[TEXT_LEN+1] = "";
textfield_i=0;
n=true; 
} Serial.print("pass: ");
Serial.println (pass);
Serial.print("fn: ");
Serial.println (fn);
Serial.print("num1: ");
Serial.println (num1);
Serial.print("num2: ");
Serial.println (num2);
Serial.print("operator: ");
Serial.println (operator_type);
Serial.print("result: ");
Serial.println (result);
delay(100);

}

// pressed button
void pressed_button()
{
textfield[textfield_i] = buttonlabels[q][0]; 
textfield_i++; 
textfield[textfield_i] = 0; // zero terminate
}

//Animate
void animate()
{
if (buttons[q].justPressed()) 
{
buttons[q].drawButton(true); // draw invert!
delay(300);
buttons[q].drawButton(); 
} 
}

//text display
void display_text()
{
tft.setCursor(TEXT_X + 2, TEXT_Y+10);
tft.setTextColor(TEXT_TCOLOR, WHITE);
tft.setTextSize(TEXT_TSIZE);
tft.print(textfield);
}

//clr button

void clr_button()
{ 
q=0;
num1 = 0;
num2 = 0; 
nc=0;
fn=0;
pass =0;
result=0;
char textfield[TEXT_LEN+1] = "";
textfield_i=0;
operator_type=0; 
n=true;
}