Why don't appear window created by ncurses? - c

Question

A new window with input must appear. But instead just a standard ncurses's window displays.
#define _POSIX_C_SOURCE 200201L
#include <stdlib.h>
#include <curses.h>
#include <time.h>
int main () {
srand(time(NULL));
initscr();
cbreak();
noecho();
// get screen sizes
int yMax, xMax;
getmaxyx(stdscr, yMax, xMax);
//create a new window for input
int height = 10;
int width = 120;
WINDOW * inputwin = newwin(height, width, yMax/2 - 5, (xMax/2 - width/2));
box(inputwin, 0, 0);
refresh();
wrefresh(inputwin);
// get amount roads
echo();
mvwprintw(inputwin, 4, width/2 - 38, "Press key left to choose beginner level, key right - intermediate, key up - advanced.");
int amount_roads = 0;
keypad(inputwin, TRUE);
int a;
while (a != KEY_DOWN) {
int c = mvwgetch(inputwin, 5, 50);
if (c == KEY_LEFT) {
mvwprintw(inputwin, 5, 50, "You chose beginner ");
amount_roads = 2;
} else if (c == KEY_RIGHT) {
mvwprintw(inputwin, 5, 50, "You chose intermediate ");
amount_roads = 3;
} else if (c == KEY_UP) {
mvwprintw(inputwin, 5, 50, "You chose advanced ");
amount_roads = 4;
} else mvwprintw(inputwin, 5, 50, "INCORRECT INPUT. TRY AGAIN");
wrefresh(inputwin);
mvwprintw(inputwin, 6, 47, "Press key down to continue");
a = mvwgetch(inputwin, 7, 60);
}
delwin(inputwin);
wrefresh(stdscr);
//create win for game
height = yMax - 4;
width = xMax - 10;
WINDOW * gamewin = newwin(height, width, 2, 5);
box(gamewin, 0, 0);
refresh();
wrefresh(gamewin);
// draw roads
int road_width = (width - 2) / amount_roads;
for (int i = road_width; i < width - 2; i += road_width + 1) {
for (int j = 1; j < height - 1; j ++) {
mvwprintw(gamewin, j, i, "|");
}
}
//draw car
char car[8][12] =
{
{' ', ' ', ' ', '_', '_', '_', '_', '_', ' ', ' ', ' ', '\0'},
{' ', '(', ')', ' ', '|', '|', '|', ' ', '(', ')', ' ', '\0'},
{'/', ' ', '_', '_', '_', '_', '_', '_', '_', ' ', '\\', '\0'},
{'|', '/', '_', '_', '_', '_', '_', '_', '_', '\\', '|', '\0'},
{'|', ' ', ' ', '_', '_', '_', '_', '_', ' ', ' ', '|', '\0'},
{'|', ' ', ' ', '\\', '_', '_','_', '/', ' ', ' ', '|', '\0'},
{'\\', '#', '#', ' ', '|', ' ', '|', ' ', '#', '#', '/', '\0'},
{' ', ' ', '#', '_', '|', '_', '|', '_', '#', ' ', ' ', '\0'}
};
int y = height - 9; //y position
for (int i = 0; i < 8; i ++) {
int x = (road_width/2) - (11/2); // x position
for (int j = 0; j < 12; j ++) {
mvwprintw(gamewin, y, x, "%c", car[i][j]);
x ++;
}
y ++;
}
wrefresh(gamewin);
// let car moves
void delete_car() {
int yCurr, xCurr;
getyx(gamewin, yCurr, xCurr);
int yPos = height - 9; //y position
for (int i = 0; i < 8; i ++) {
int xPos = xCurr - 13; // x position
for (int j = 0; j < 12; j ++) {
mvwprintw(gamewin, yPos, xPos, "%c", ' ');
xPos ++;
}
yPos ++;
}
wrefresh(gamewin);
}
int move_car(const char direction) {
// let to move at given side
int add;
if (direction == 'l') add = -road_width;
else if (direction == 'r') add = road_width;
else return 0;
//defines a start position for car from left side
int yCurr, xCurr;
getyx(gamewin, yCurr, xCurr);
int yPos = height - 9;
for (int i = 0; i < 8; i ++) {
int xPos = (xCurr - 13) + add; // x position
for (int j = 0; j < 12; j ++) {
mvwprintw(gamewin, yPos, xPos, "%c", car[i][j]);
xPos ++;
}
yPos ++;
}
wrefresh(gamewin);
getyx(gamewin, yCurr, xCurr);
return xCurr;
}
int attempt = 0;
while (attempt < 20) {
keypad(gamewin, TRUE);
int move = mvwgetch(gamewin, y - 1, ((road_width/2) - (11/2)) + 13);
if (move == KEY_RIGHT) {
int yCurr, xCurr; // check is the road on the right
getyx(gamewin, yCurr, xCurr);
if ((xCurr - 13) > (road_width * amount_roads + (amount_roads - 1))) {
wprintw(gamewin, "There is no the road");
}
delete_car();// clear current road
move_car('r');// add car to next road
} else if (move == KEY_LEFT) {
int yCurr, xCurr; // check is the road on the left
getyx(gamewin, yCurr, xCurr);
if ((xCurr - 13) < road_width) wprintw(gamewin, "There is no the road");
delete_car(); // clear current road
move_car('l'); // add car to next road
}
}
wrefresh(gamewin);
getch();
endwin();
return EXIT_SUCCESS;
}
I'm writing a small game using ncurses, first I create a user login window, then a window for the game itself. Literally yesterday, everything was working fine, today nothing is displayed except for the standard window with the input at the very beginning. I don't understand what the matter is, maybe I accidentally deleted something, I don't know. I have read the entire code several times, and I have not found where the error is, please tell me what is wrong

Answer 1

A single function can be used to erase or print the car.
Use the xMax and yMax as a base for the window dimensions so the window fits in the terminal.
#include <stdlib.h>
#include <ncurses.h>
#include <time.h>
#define CAR_HEIGHT 8
#define CAR_WIDTH 12
void draw_car ( WINDOW *gamewin, char car[][CAR_WIDTH], int y, int x, int show) {
for ( int i = 0; i < CAR_HEIGHT; i ++) {
for ( int j = 0; j < CAR_WIDTH; j ++) {
if ( show) {
mvwprintw ( gamewin, y + i, x + j, "%c", car[i][j]);
} else {
mvwprintw ( gamewin, y + i, x + j, " ");
}
}
}
}
int main ( void) {
initscr ( );
cbreak ( );
noecho ( );
srand ( time ( NULL));
// get screen sizes
int yMax = 0, xMax = 0;
getmaxyx ( stdscr, yMax, xMax);
//create a new window for input
int height = yMax - 2;
int width = xMax - 2;
WINDOW *inputwin = newwin ( height, width, 1, 1);
box ( inputwin, 0, 0);
refresh ( );
wrefresh ( inputwin);
// get amount roads
echo ( );
mvwprintw ( inputwin, 1, 1, "Press key left to choose beginner level.");
mvwprintw ( inputwin, 2, 7, "key right - intermediate.");
mvwprintw ( inputwin, 3, 7, "key up - advanced.");
int amount_roads = 0;
keypad ( inputwin, TRUE);
int a = 0;
do {
a = mvwgetch ( inputwin, 7, 60);
switch ( a) {
case KEY_LEFT:
mvwprintw ( inputwin, 5, width / 2, "You chose beginner ");
amount_roads = 2;
break;
case KEY_RIGHT:
mvwprintw ( inputwin, 5, width / 2, "You chose intermediate ");
amount_roads = 3;
break;
case KEY_UP:
mvwprintw ( inputwin, 5, width / 2, "You chose advanced ");
amount_roads = 4;
break;
case KEY_DOWN:
break;
default:
amount_roads = 0;
}
if ( amount_roads) {
mvwprintw ( inputwin, 6, width / 2, "Press key down to continue");
} else {
mvwprintw ( inputwin, 5, width / 2, "INCORRECT INPUT. TRY AGAIN");
mvwprintw ( inputwin, 6, width / 2, " ");
}
wrefresh ( inputwin);
} while ( ! amount_roads || a != KEY_DOWN);
wrefresh ( inputwin);
delwin ( inputwin);
refresh ( );
//create win for game
height = yMax - 4;
width = xMax - 4;
WINDOW *gamewin = newwin ( height, width, 2, 2);
box ( gamewin, 0, 0);
keypad ( gamewin, TRUE);
refresh ( );
wrefresh ( gamewin);
// draw roads
int road_width = ( width - amount_roads) / amount_roads;
for ( int i = road_width; i < width - 2; i += road_width + 1) {
for ( int j = 2; j < height - 1; j ++) {
mvwprintw ( gamewin, j, i, "|");
}
}
char car[CAR_HEIGHT][CAR_WIDTH] = {
{ " _____ "},
{ " () ||| () "},
{ "/ _______ \\"},
{ "|/_______\\|"},
{ "| _____ |"},
{ "| \\___/ |"},
{ "\\## | | ##/"},
{ " #_|_|_# "}
};
int y = height - 9; //y position
int road_lane = 0;
int show = 1;
int x = road_lane * road_width + ( road_width / 2 - 5); // x position
draw_car ( gamewin, car, y, x, show);
wrefresh ( gamewin);
int attempt = 0;
int change = 0;
do {
change = mvwgetch ( gamewin, 1, 1);
draw_car ( gamewin, car, y, x, ! show);
switch ( change) {
case KEY_RIGHT:
if ( road_lane == amount_roads - 1) {
mvwprintw ( gamewin, 1, 2, "There is no the road");
} else {
mvwprintw ( gamewin, 1, 2, " ");
++road_lane;
x += road_width + 1; // x position
}
break;
case KEY_LEFT:
if ( road_lane == 0) {
mvwprintw ( gamewin, 1, 2, "There is no the road");
} else {
mvwprintw ( gamewin, 1, 2, " ");
--road_lane;
x -= road_width + 1; // x position
}
break;
case KEY_DOWN:
if ( y == height - 9) {
mvwprintw ( gamewin, 1, 2, "There is no the road");
} else {
mvwprintw ( gamewin, 1, 2, " ");
++y;
}
break;
case KEY_UP:
if ( y == 2) {
mvwprintw ( gamewin, 1, 2, "There is no the road");
} else {
mvwprintw ( gamewin, 1, 2, " ");
--y;
}
break;
}
draw_car ( gamewin, car, y, x, show);
} while ( attempt < 20 && change != '\n');
wrefresh ( gamewin);
// getch();
delwin ( gamewin);
endwin ( );
return EXIT_SUCCESS;
}