Hey! So for a C++ assignment I have, I need to create a snake game along with ad
ID: 664214 • Letter: H
Question
Hey! So for a C++ assignment I have, I need to create a snake game along with adding a couple of my own features. I'm able to run the game perfectly, but I'm having a little trouble with the features I want to add. So when the program is run, there's a welcome screen that gives two options, 1. is to start the game, and 2. is to exit the program. I'm able to do 1, but I'm having trouble with 2. It seems simple but for some reason I can't get it so I was hoping someone could help with that. The other feature I want to add is for the program to output the score (aka how many times the snake reaches the "food") before it dies. The code I'm including is the main .cpp file where these changes would be made. This code by itself won't run the game as there are other .h and .cpp files to go along with this, but I think this will be enough. If you feel you need to see the rest of the files let me know and I will find a way to show you. Thanks in advance!
Code:
#include "game.h"
#include <thread>
//get_key will return the key user typed
char Game::get_key()
{
int n;
char buf[3];
n = read(0,buf,sizeof(buf));
if(3 == n && buf[0] == 27 && buf[1] == 91)
{
return buf[2];
}
else if(1 == n)
{
return buf[0];
}
return 0;
}
//need to implement end funtion()
int Game::end() //exit game function
{
pen.goto_xy(ROW + 3,1);
system("stty echo icanon"); //restart cache
pen.show_cur();
//need to make cursor goto the bottom
//need to show cursor
exit(0); //exit
}
int Game::getKey() //key control function
{
//TODO
//need to implement this function
int quit = 0;
int flag = 1;
while(!quit){
char key;
key = get_key();
switch(key)
{
case UP:
snake.head.direction = UP;
break;
case DOWN:
snake.head.direction = DOWN;
break;
case RIGHT:
snake.head.direction = RIGHT;
break;
case LEFT:
snake.head.direction = LEFT;
default:
break;
}
}
return 0;
}
//function use to draw a box
void Game::drawBox() //draw the outer range
{
pen.clr_scrn();
pen.draw_box(1,20,ROW,COL,44,34,'#');
}
void Game::drawSnake(void) // draw snake
{
int i;
pen.draw_rect(snake.head.pos.x,snake.head.pos.y + 20,1,1,43,33, 'x');
for(i=0; i<= snake.body.count() - 1; i++){
pen.draw_rect(snake.body.body_[i].x,snake.body.body_[i].y+20,1,1,3,32,'@');
}
}
void Game::snakeMove(void) //move snake
{
int i;
if(snake.head.pos.x<=1 || snake.head.pos.x >= ROW+1 || snake.head.pos.y <=0 || snake.head.pos.y >= COL){
end();
}
//for when the snake hits itself
for(i=0; i<snake.body.count();i++){
if(snake.head.pos.x==snake.body.body_[i].x && snake.head.pos.y==snake.body.body_[i].y){
std::cout<<snake.head.pos.x<<" "<<snake.head.pos.y<<std::endl;
std::cout<<snake.body.body_[i].x<<" "<<snake.body.body_[i].y<<std::endl;
std::cout<<"Don't hit yourself!!!"<<std::endl;
end();
}
}
//for when the snake hits the food
if(snake.head.pos.x==food.pos.x && snake.head.pos.y==food.pos.y){
food.update(snake.body.body_,snake.head.pos.x,snake.head.pos.y);
snake.body.add(0,0);
}
snake.body.move(snake.head.pos.x,snake.head.pos.y);
switch(snake.head.direction){
case UP:
if(fkey!='d'){
snake.head.pos.x -= 1;
fkey='u';
}
else{
snake.head.pos.x += 1;
}
break;
case DOWN:
if(fkey!='u'){
snake.head.pos.x += 1;
fkey='d';
}
else{
snake.head.pos.x -= 1;
}
break;
case RIGHT:
if(fkey!='l'){
snake.head.pos.y += 1;
fkey='r';
}
else{
snake.head.pos.y -= 1;
}
break;
case LEFT:
if(fkey!='r'){
snake.head.pos.y -= 1;
fkey='l';
}
else{
snake.head.pos.y += 1;
}
break;
}
}
void Game::start(){
int quit = 0;
while(!quit)
{
system("stty -echo -icanon"); //cancel cache
pen.hide_cur();
pen.clr_scrn();
drawBox();
//need to draw a welcome page
//need to add more feature in the switch below
pen.goto_xy(8,33);
pen.putstr(31,1," Snake");
pen.goto_xy(10,33);
pen.putstr(31,1,"1. New Game");
pen.goto_xy(11,33);
pen.putstr(31,1,"2. Exit");
fflush(stdout); //flush the buffer
int back = 0;
while(!back)
{
int ret;
char key = '0';
int i;
key = get_key(); //get key
switch(key)
{
case 49: // start game,??? is the key you use to start game
gameStart();
std::thread f1([&](){
while(true){
drawBox();
pen.draw_rect(food.pos.x,food.pos.y + 20,1,1,46,36,'#');
snakeMove();
drawSnake();
fflush(stdout);
usleep(200000);
}
});
std::thread f2([&](){
getKey();
});
f1.join();
f2.join();
back = 1; // note for end
break;
}
}
}
end(); // end of game
}
void Game::gameStart(){
snake.head.pos.x = 10; //init the head position
snake.head.pos.y = 20;
snake.body.add(10,19); //init the body position
snake.body.add(10,18);
snake.body.add(10,17);
fkey = 'r'; //direction
snake.head.direction = RIGHT; //head direction
speed=401;
food.update(snake.body.body_,snake.head.pos.x,snake.head.pos.y); //init food position
}
Explanation / Answer
Try to use terminate() or abort(). They may not clean up memory, and are mostly used when data is corrupted. However, if you don't want to use this then make logical changes to your program to exit instead of calling some built in function.
In the snake move function, increment a count where snake hits the food.
if(snake.head.pos.x==food.pos.x && snake.head.pos.y==food.pos.y){
foodCount++;
food.update(snake.body.body_,snake.head.pos.x,snake.head.pos.y);
snake.body.add(0,0);
}
Display this foodCount when game ends