Bugs in code?

Hristo · 2015-07-09T10:03:36

Hello guys, I've tried making simple snake game with SDL 2, but..The code doesn't work in Visual Studio, I mean when I compile it, there is only black screen, but when I compile it in Code::Blocks, there is other result..Any ideas? #include <iostream> #include <SDL.h> #include <deque> using namespace std; static const int WINDOW_WIDTH = 800; static const int WINDOW_HEIGHT = 600; static const int GO_UP = 1; static const int GO_LEFT = 2; static const int GO_RIGHT = 3; static const int GO_DOWN = 4; static const int CELL_SIZE = 20; static const int CELL_WIDTH = WINDOW_WIDTH / CELL_SIZE; static const int CELL_HEIGHT = WINDOW_HEIGHT / CELL_SIZE; static const int START_X = CELL_WIDTH / 2; static const int START_Y = CELL_HEIGHT / 2; static const int START_LENGTH = 3; bool b[4] = { 0, 0, 0, 0 }; class SnakeParts { public: int x, y; SnakeParts(int x, int y) { this->x = x; this->y = y; } }; class Food { public: int x, y; Food() { newFood(); } void newFood() { x = 1 + rand() % (CELL_WIDTH - 2); y = 1 + rand() % (CELL_HEIGHT - 2); } }; class Snake { public: Snake(int headColor, int bodyColor, int appleColor) { this->headColor = headColor; this->bodyColor = bodyColor; this->appleColor = appleColor; restart(); } ~Snake() { snakeParts.clear(); } void restart() { snakeParts.clear(); for(int i = 0; i < START_LENGTH; i++) { addPart(START_X - i, START_Y); direction = GO_RIGHT; time = 0; timeOut = 6; eaten = false; } } void update() { if(eaten) { return; }; updateInputControls(); time++; if(time < timeOut) { return; } time = 0; if(isCollidingWithWall() == true || isCollidingWithSelf() == true) { eaten = true; } if(isCollidingWithApple() == true) { apple.newFood(); } else { snakeParts.pop_back(); } moveSnake(); } void render(SDL_Surface* screen) { if(eaten) { return; } renderRectangle.x = CELL_SIZE; renderRectangle.y = CELL_SIZE; renderApple(screen); renderSnake(screen); } inline bool isEaten() { return eaten; } private: deque<SnakeParts> snakeParts; Food apple; bool eaten; int direction; int time, timeOut; int headColor, bodyColor, appleColor; SDL_Rect renderRectangle; void updateInputControls() { if(b[0] == true && direction != GO_DOWN) { direction = GO_UP; } else { if(b[1] == true && direction != GO_DOWN) { direction = GO_DOWN; } } if(b[2] == true && direction != GO_LEFT) { direction = GO_LEFT; } else { if(b[3] == true && direction != GO_RIGHT) { direction = GO_RIGHT; } } } void renderSnake(SDL_Surface* screen) { renderRectangle.x = snakeParts[0].x * CELL_SIZE; renderRectangle.y = snakeParts[0].y * CELL_SIZE; SDL_FillRect(screen, &renderRectangle, SDL_MapRGB(screen->format, 33, 246, 39)); for(int i = 0; i < snakeParts.size(); i++) { renderRectangle.x = snakeParts[i].x * CELL_SIZE; renderRectangle.y = snakeParts[i].y * CELL_SIZE; SDL_FillRect(screen, &renderRectangle, SDL_MapRGB(screen->format, 93, 246, 39)); } } void renderApple(SDL_Surface* screen) { renderRectangle.x = apple.x * CELL_SIZE; renderRectangle.y = apple.y * CELL_SIZE; SDL_FillRect(screen, &renderRectangle, SDL_MapRGB(screen->format, 215, 37, 49)); } void addPart(int x, int y) { SnakeParts body(x, y); snakeParts.push_back(body); } void moveSnake() { static const int moveX[] = { 0, 0, -1, 1 }; static const int moveY[] = { -1, 1, 0, 0 }; int x = snakeParts[0].x + moveX[direction]; int y = snakeParts[0].y + moveY[direction]; SnakeParts nextPart(x, y); snakeParts.push_front(nextPart); } bool isCollidingWithWall() { int snakeHeadPositionX = snakeParts[0].x; int snakeHeadPositionY = snakeParts[0].y; return ((snakeHeadPositionX == 0) || (snakeHeadPositionY == 0) || (snakeHeadPositionX == CELL_WIDTH) || (snakeHeadPositionY == CELL_HEIGHT)); } bool isCollidingWithSelf() { int headPositionX = snakeParts[0].x; int headPositionY = snakeParts[0].y; for(int i = 0; i < snakeParts.size(); i++) { if(snakeParts[i].x == headPositionX && snakeParts[i].y == headPositionY) { return true; } } return false; } bool isCollidingWithApple() { return (snakeParts[0].x == apple.x && snakeParts[0].y == apple.y); } }; int main(int argc, char* argv[]) { SDL_Window* window = NULL; SDL_Surface* screen = NULL; bool appQuit = false; SDL_Event event; // bool b[4] = { 0, 0, 0, 0 }; Snake snake(1, 2, 3); if(SDL_Init(SDL_INIT_EVERYTHING) < 0) { cout << "Error, while initializing SDL - " << SDL_GetError() << endl; } window = SDL_CreateWindow("Snake Game", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, WINDOW_WIDTH, WINDOW_HEIGHT, SDL_WINDOW_SHOWN); if(window == NULL) { cout << "Error, while oppening the window! " << SDL_GetError() << endl; } while(appQuit != true) { if(SDL_PollEvent(&event)) { if(event.type == SDL_QUIT) { appQuit = true; } if(event.type == SDL_KEYUP) { if(event.type == SDL_KEYDOWN) { switch(event.key.keysym.sym) { case SDLK_UP: b[0] = 0; break; case SDLK_LEFT: b[1] = 0; break; case SDLK_RIGHT: b[2] = 0; break; case SDLK_DOWN: b[3] = 0; break; } } } if(event.type == SDL_KEYDOWN) { switch(event.key.keysym.sym) { case SDLK_UP: b[0] = 1; break; case SDLK_LEFT: b[1] = 1; break; case SDLK_RIGHT: b[2] = 1; break; case SDLK_DOWN: b[3] = 1; break; } } } screen = SDL_GetWindowSurface(window); // SDL_FillRect(screen, NULL, SDL_MapRGB(screen->format, 0x00, 0x00, 0x00)); // SDL_FillRect(screen, &boxRectangle, SDL_MapRGB(screen->format, 0x33, 0x99, 0xFF)); snake.render(screen); snake.update(); SDL_UpdateWindowSurface(window); } SDL_Quit(); return 0; }

For Beginners

Started by sn0k3 July 08, 2015 08:10 AM

10 comments, last by sn0k3 9 years, 5 months ago

Lactose

11,696

July 09, 2015 09:22 AM

They aren't moving

snake.update() is what's moving the snake. In the code you posted, you're not calling it.

Hello to all my stalkers.

sn0k3

Author

560

July 09, 2015 10:03 AM

Yes, I know added it later. There is strange thing, I think the snake is moving too fast, because when I add SDL_Delay(20) after snake.update()

there is snake, but after around 5 seconds it blinks and there is not snake..Maybe I should try making snake to move slower or there is something that I should add

for frames?

Bugs in code?

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