C和SFML中的Pacman冲突代码帮助

Question

所以，最近我开始用C和SFML制作一个Pacman克隆。开发游戏时一切都很顺利，直到我需要创建墙碰撞。我不擅长碰撞，所以我以为会有问题。

我想做的是检查你上方是否有一堵墙，除了你或其他什么，然后如果你与一堵墙相撞，阻止玩家。

问题是，当你撞到墙时，你很早就停下来了。有时你会陷入困境。这并不是要与代码混淆，因为代码使Pacman在你身上有一堵墙的时候不能转身，而是在遇到墙的时候停下来。

这是我刚才提到的关于翻转碰撞的代码（它也可以工作，所以不需要修复它）：

// All of the movement functions.
if (Keyboard::isKeyPressed(Keyboard::Up) && mapData[xtile + (ytile - 1) * 25] != 1 && mapData[xtile + (ytile - 1) * 25] != 2){
    direction = Directions{ Up };
    setVelocity(0.0, -2.5);
    source.x = 73;
}
if (Keyboard::isKeyPressed(Keyboard::Down) && mapData[xtile + (ytile + 1) * 25] != 1 && mapData[xtile + (ytile + 1) * 25] != 2){
    direction = Directions{ Down };
    setVelocity(0.0, 2.5);
    source.x = 110;
}
if (Keyboard::isKeyPressed(Keyboard::Left) && mapData[(xtile + 1) + ytile * 25] != 1 && mapData[(xtile - 1) + ytile * 25] != 2){
    direction = Directions{ Left };
    setVelocity(-2.5, 0.0);
    source.x = 0;
}
if (Keyboard::isKeyPressed(Keyboard::Right) && mapData[(xtile - 1) + ytile * 25] != 1 && mapData[(xtile + 1) + ytile * 25] != 2){
    direction = Directions{ Right };
    setVelocity(2.5, 0.0);
    source.x = 38;
}

消息来源。x thingy用于动画，因此这与手头的问题无关。setVelocity为玩家设置速度，方向就是玩家的方向。方向由枚举设置。

这是我的代码，如果你想看到所有其他文件和类（它们可能与问题无关）或其他信息，只要问我代码或解释，我就会发布！

但是废话够了，我们走！

main.cpp

// Headers for the program.
#include <iostream>
#include <vector>
#include <SFML/Graphics.hpp>

// Game headers.
#include "renderer.h"
#include "pacman.h"
#include "pellet.h"
#include "map.h"

using std::cout;
using namespace sf;

// All of theese functions will be used for doing things in the future.
void render();
void logic();

enum Directions{ Up = 1, Down = 2, Left = 3, Right = 4 }; // pacman's directions 

// Level data array. For the map.
int mapData[] =
{
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 1
1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, // 2
1, 3, 1, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 1, 3, 1, // 3
1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, // 4
1, 3, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 3, 1, // 5
1, 3, 3, 3, 3, 3, 1, 3, 3, 3, 3, 3, 1, 3, 3, 3, 3, 3, 1, 3, 3, 3, 3, 3, 1, // 6
1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, // 7
0, 0, 0, 0, 1, 3, 1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 3, 1, 0, 0, 0, 0, // 8
1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 2, 2, 2, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, // 9
3, 3, 3, 3, 3, 3, 3, 3, 1, 0, 0, 0, 0, 0, 0, 0, 1, 3, 3, 3, 3, 3, 3, 3, 3, // 10
1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, // 11
0, 0, 0, 0, 1, 3, 1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 3, 1, 0, 0, 0, 0, // 12
1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, // 13
1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, // 14
1, 3, 1, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 1, 3, 1, // 15
1, 3, 3, 3, 1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 3, 3, 3, 1, // 16
1, 1, 1, 3, 1, 3, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 3, 1, 3, 1, 1, 1, // 17
1, 3, 3, 3, 3, 3, 1, 3, 3, 3, 3, 3, 1, 3, 3, 3, 3, 3, 1, 3, 3, 3, 3, 3, 1, // 18
1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, // 19
1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, // 20
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 // 21
};

// The maze for the game.
Map maze{ mapData };

// Make the renderer.
Renderer renderer(Vector2u(800, 800), "Pac-man");

// Make our yellow friend
Pacman pacman(358, 353);

int main(){

while (renderer.window.isOpen()){ // As long as the window is open, do this loop.
    Event event; // A event var for only one thing, closing the window.

    while (renderer.window.pollEvent(event)){ // Poll a event...
        if (event.type == Event::Closed){ // Check if the event is a close event...
            renderer.window.close(); // ... and if it is a close event then close the window.
        }
    }

    logic(); // Doing our logic before the rendering.
    render(); // Rendering.

}
}

void render(){
for (int x = 0; x < maze.map.size(); x++){
    renderer.Render(maze.map[x]);
}

renderer.Render(pacman.sprite); // Render Pacman.

renderer.window.display(); // Display...
renderer.window.clear(); // ... And then clear the image.
}

void logic(){ // Here we are going to do all of our game logic.

pacman.update(mapData, maze.map);

pacman.sprite.move(pacman.xvel, pacman.yvel); // Move Pacman

// The problem most likely occurs with theese ifs:
if (pacman.direction == Up &&     !pacman.sprite.getGlobalBounds().intersects(maze.map[pacman.xtile  + (pacman.ytile - 1) * 25].getGlobalBounds()) && mapData[
    pacman.xtile + (pacman.ytile - 1) * 25] == 1){
    pacman.yvel = 0;
}
if (pacman.direction == Down && !pacman.sprite.getGlobalBounds().intersects(maze.map[pacman.xtile + (pacman.ytile + 1) * 25].getGlobalBounds()) && mapData[
    pacman.xtile + (pacman.ytile + 1) * 25] == 1){
    pacman.yvel = 0;
}
if (pacman.direction == Left && !pacman.sprite.getGlobalBounds().intersects(maze.map[(pacman.xtile - 1) + pacman.ytile * 25].getGlobalBounds()) && mapData[
    (pacman.xtile - 1) + pacman.ytile * 25] == 1){
    pacman.xvel = 0;
}
if (pacman.direction == Right && !pacman.sprite.getGlobalBounds().intersects(maze.map[(pacman.xtile + 1) + pacman.ytile * 25].getGlobalBounds()) && mapData[
    (pacman.xtile + 1) + pacman.ytile * 25] == 1){
    pacman.xvel = 0;
}

// pellet collision (fully working)
if (mapData[pacman.xtile + pacman.ytile * 25] == 3){
    mapData[pacman.xtile + pacman.ytile * 25] = 0;
    maze.map[pacman.xtile + pacman.ytile * 25].setColor(sf::Color(0, 0, 0, 0));
    pacman.addPoint();
}

}

好了。如果你对如何解决或绕过这个问题有任何建议，请随时发给我。记住，如果你需要更多的信息，尽管问我。提前谢谢！

Answer 1

如何移动这两条线：

pacman.update(mapData, maze.map);
pacman.sprite.move(pacman.xvel, pacman.yvel); // Move Pacman

检查后：

if (pacman.direction == Right ...

好像你先更新然后检查。