Question

我正在使用惊人的raylib在C中制作一个简单的游戏，我尝试打印我的玩家坐标，但应该更新的x值保持在0，而y值应该保持在同样打印一个根据我的玩家的x值改变的垃圾值

我的代码如下：（here是评论版，抱歉如果帖子中嵌入的代码太多）

// WIP

#include "raylib.h"

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>

//#define PLATFORM_WEB
#define DEBUG

#if defined(PLATFORM_WEB)
    #include <emscripten/emscripten.h>
#endif

#define PLAYER_MAX_LIFE         5

typedef enum GameScreen { LOGO, TITLE, GAMEPLAY, ENDING } GameScreen;

typedef struct Player {
    Vector2 position;
    Vector2 size;
    int life;
} Player;

typedef struct Food {
    Vector2 position;
    int value;
} Food;

static int  screenWidth = 800;
static int  screenHeight = 450;

static int  framesCounter;
static bool gameOver;
static bool pause;

#if defined(DEBUG)
static char* debugText;
#endif

static Player player;

static void InitGame(void);         // Initialize game
static void UpdateGame(void);       // Update game (one frame)
static void DrawGame(void);         // Draw game (one frame)
static void UnloadGame(void);       // Unload game
static void UpdateDrawFrame(void);  // Update and Draw (one frame)

int main()
{
    InitWindow(screenWidth, screenHeight, "what should i name this piece of s##t game");

    InitGame();

#if defined(PLATFORM_WEB)
    emscripten_set_main_loop(UpdateDrawFrame, 0, 1);
#else

    // Main game loop
    while (!WindowShouldClose())    // Detect window close button or ESC key
    {
        UpdateGame();
        DrawGame();
    }
#endif

    UnloadGame();         // Unload loaded data (textures, sounds, models etc)

    CloseWindow();        // Close window and OpenGL context    
    return 0;
}

void InitGame(void)
{
    player.position = (Vector2){ screenWidth/2, screenHeight - screenHeight/8 };
    player.size = (Vector2){ screenWidth/10, 20 };
    player.life = PLAYER_MAX_LIFE;
    debugText = malloc(sizeof(char) * 20);
}

void UpdateGame(void)
{
    if (!gameOver)
    {
        if (IsKeyPressed('P')) pause = !pause;

        if (!pause)
        {
            if (IsKeyDown(KEY_LEFT))                                  player.position.x -= 5;
            if ((player.position.x - player.size.x/2) <= 0)           player.position.x = player.size.x/2;
            if (IsKeyDown(KEY_RIGHT))                                 player.position.x += 5;
            if ((player.position.x + player.size.x/2) >= screenWidth) player.position.x = screenWidth - player.size.x/2;

        #if defined(DEBUG)
            debugText = FormatText("screen: %dx%d\nx: %d\ny: %d", screenWidth, screenHeight, player.position.x, player.position.y);
        #endif    
            if (player.life <= 0) gameOver = true;
        }
    }
    else
    {
        if (IsKeyPressed(KEY_ENTER))
        {
            InitGame();
            gameOver = false;
        }
    }
}

void DrawGame(void)
{
    BeginDrawing();
        ClearBackground(RAYWHITE);

        if (!gameOver)
        {
        #if defined(DEBUG)
            DrawText(debugText, 50, 70, 20, BLACK);
        #endif
            DrawRectangle(0, screenHeight - screenHeight/8 + (screenHeight - screenHeight/8)/36, screenWidth, screenHeight/9, GREEN);

            DrawRectangle(player.position.x - player.size.x/2, player.position.y - player.size.y/2, player.size.x, player.size.y, BLACK);

            for (int i = 0; i < player.life; i++) DrawRectangle(20 + 40*i, screenHeight - 30, 35, 10, LIGHTGRAY);

            if (pause) DrawText("GAME PAUSED", screenWidth / 2 - MeasureText("GAME PAUSED", 40)/2, screenHeight/2 - 40, 40, GRAY);
        }
        else DrawText("PRESS [ENTER] TO PLAY AGAIN", screenWidth/2 - MeasureText("PRESS [ENTER] TO PLAY AGAIN", 20)/2, screenHeight/2 - 50, 20, GRAY);

    EndDrawing();
}

void UnloadGame(void)
{
    free(debugText);
}

void UpdateDrawFrame(void)
{
    UpdateGame();
    DrawGame();
}    

static void UpdateFood(void)
{
    //TODO: Implement logic
}

我认为有问题的部分是：

debugText = FormatText("screen: %dx%d\nx: %d\ny: %d", screenWidth, screenHeight, player.position.x, player.position.y);

访问player.position.x和player.position.y不起作用或者可能存在某种溢出？我真的不知道，所以任何帮助都会受到赞赏。

Answer 1

原来其中一个问题是溢出而另一个问题是使用了错误的格式说明符改变这两行修正了它：

-- debugText = malloc(sizeof(char) * 20);
++ debugText = malloc(sizeof(char) * 40);

-- debugText = FormatText("screen: %dx%d\nx: %d\ny: %d", screenWidth, screenHeight, player.position.x, player.position.y);
++ debugText = FormatText("screen: %dx%d\nx: %f\ny: %f", screenWidth, screenHeight, player.position.x, player.position.y);

我的调试文本显示垃圾

1 个答案: