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我最近一直在用 allegro 学习一些游戏编程，但遇到了一个问题。我的“游戏”是我到目前为止所学的许多教程的编译类型。无论如何，我遇到了 Allegro 的功能问题。我的第一个代码是这样的：

#include <allegro.h>
#include <sstream>
#include <string>
#include <cstring>
#include <fstream>
volatile bool Close = false;
void handler(){
     Close = true;}
/*timer*/
volatile long speed_counter = 0;
void increment_speed_counter(){
     speed_counter++;
     }
END_OF_FUNCTION(increment_speed_counter);

using namespace std;


int main() 
{   
if(!allegro_init()){
                    fstream error;
                    error.open("error_log.txt", ios::ate);
                    error << "ERROR: Failed to initialized allegro!!\n";
                    error.close();
                    }
    install_keyboard();
    install_timer();

    LOCK_VARIABLE(speed_counter);
    LOCK_FUNCTION(increment_speed_counter);
 install_int_ex(increment_speed_counter, BPS_TO_TIMER(120));

    set_color_depth(24);
    set_gfx_mode(GFX_AUTODETECT_WINDOWED, 640, 480, 0, 0);

    BITMAP *buffer = create_bitmap(640, 480);
    BITMAP *spaceship = load_bitmap("ship.bmp", NULL); //up
    BITMAP *spaceship2 = load_bitmap("ship2.bmp", NULL); //down
    BITMAP *spaceship3 = load_bitmap("ship3.bmp", NULL); //right
    BITMAP *spaceship4 = load_bitmap("ship4.bmp", NULL); //left
    FONT *myriad = load_font("myriad.pcx", NULL, NULL);
    BITMAP *meteor = load_bitmap("meteor.bmp", NULL);
    BITMAP *options = create_bitmap(640, 480);

//srand(time(NULL));
LOCK_FUNCTION(handler);
//int mx = rand() % 100;
//int my = rand() % 100;
long int ship_x = 300;
long int ship_y = 200;
int Bx [1000];
int By [1000];
    bool done = false;
set_close_button_callback(handler);




    while(!Close){                 
  while(speed_counter > 0){
textprintf_ex(screen, font, 200,10, makecol(255,100,200), -1, "Space Void: Asonomia"); 

                 if(ship_x >= 620){
                           ship_x = 620;
                           }
                 if(ship_y >= 460){
                           ship_y = 460;
                           }
                 if(ship_x <= 0){
                           ship_x = 0;
                           }
                 if(ship_y <= 0){
                           ship_y = 0;
                           }

                 if(key[KEY_ESC]){
                                 Close = true;
                                  }
                 if(key[KEY_LEFT]){

                                   ship_x -=5;
                                 clear(buffer);
                                 draw_sprite(buffer, spaceship4, ship_x, ship_y);
                                 blit(buffer, screen, 0,0,0,0, 640, 480);
                                 rest(20);
                                   }
                 if(key[KEY_RIGHT]){
                                    ship_x +=5;
                                 clear(buffer);
                                 draw_sprite(buffer, spaceship3, ship_x, ship_y);
                                 blit(buffer, screen, 0,0,0,0, 640, 480);
                                 rest(20);
                                    }
                 if(key[KEY_UP]){
                                 ship_y -= 5;
                                 clear(buffer);
                                 draw_sprite(buffer, spaceship, ship_x, ship_y);
                                 blit(buffer, screen, 0,0,0,0, 640, 480);
                                 rest(20);
                                 }
                 if(key[KEY_DOWN]){
                                   ship_y += 5;
                                   clear(buffer);
                                 draw_sprite(buffer, spaceship2, ship_x, ship_y);
                                 blit(buffer, screen, 0,0,0,0, 640, 480);
                                 rest(20);
                                   }

speed_counter--;
                }
}



   destroy_bitmap(spaceship);
    destroy_bitmap(spaceship2);
    destroy_bitmap(spaceship3);
    destroy_bitmap(spaceship4);
    destroy_bitmap(buffer);

    return 0;
}
END_OF_MAIN()

它非常混乱，所以我决定通过添加功能来清理它。

所以现在是这样的：

#include <allegro.h>
#include <sstream>
#include <string>
#include <cstring>
#include <fstream>

//X Button
volatile bool Close = false;
void handler(){
     Close = true;}
//FPS 
volatile long speed_counter = 0;
void increment_speed_counter(){
    speed_counter++;
}

void initialize(){
    if(!allegro_init()){
    allegro_message("Error Initializing Allegro");
    }
    install_keyboard();
    install_timer();
    LOCK_VARIABLE(speed_counter);
    LOCK_FUNCTION(increment_speed_counter);
    install_int_ex(increment_speed_counter, BPS_TO_TIMER(60));

    //Video Mode

    set_color_depth(24);
    set_gfx_mode(GFX_AUTODETECT_WINDOWED, 640, 480, 0,0);

}


void load_externs(){
    BITMAP *buffer = create_bitmap(640, 480);
    BITMAP *spaceship = load_bitmap("ship.bmp", NULL); //up
    BITMAP *spaceship2 = load_bitmap("ship2.bmp", NULL); //down
    BITMAP *spaceship3 = load_bitmap("ship3.bmp", NULL); //right
    BITMAP *spaceship4 = load_bitmap("ship4.bmp", NULL); //left
    BITMAP *meteor = load_bitmap("meteor.bmp", NULL);
    BITMAP *options = create_bitmap(640, 480);
}

int main(){
initialize();
load_externs();

    long int ship_x = 300;
    long int ship_y = 200;
    bool done = false;
    set_close_button_callback(handler);

    while(!Close){                 
while(speed_counter > 0){
textprintf_ex(screen, font, 200,10, makecol(255,100,200), -1, "Space Void: Asonomia"); 

                 if(ship_x >= 620){
                           ship_x = 620;
                           }
                 if(ship_y >= 460){
                           ship_y = 460;
                           }
                 if(ship_x <= 0){
                           ship_x = 0;
                           }
                 if(ship_y <= 0){
                           ship_y = 0;
                           }

                 if(key[KEY_ESC]){
                                 Close = true;
                                  }
                 if(key[KEY_LEFT]){

                                   ship_x -=5;
                                 clear(buffer);
                                 draw_sprite(buffer, spaceship4, ship_x, ship_y);
                                 blit(buffer, screen, 0,0,0,0, 640, 480);
                                 rest(20);
                                   }
                 if(key[KEY_RIGHT]){
                                    ship_x +=5;
                                 clear(buffer);
                                 draw_sprite(buffer, spaceship3, ship_x, ship_y);
                                 blit(buffer, screen, 0,0,0,0, 640, 480);
                                 rest(20);
                                    }
                 if(key[KEY_UP]){
                                 ship_y -= 5;
                                 clear(buffer);
                                 draw_sprite(buffer, spaceship, ship_x, ship_y);
                                 blit(buffer, screen, 0,0,0,0, 640, 480);
                                 rest(20);
                                 }
                 if(key[KEY_DOWN]){
                                   ship_y += 5;
                                   clear(buffer);
                                 draw_sprite(buffer, spaceship2, ship_x, ship_y);
                                 blit(buffer, screen, 0,0,0,0, 640, 480);
                                 rest(20);
                                   }

speed_counter--;
                }
}



   destroy_bitmap(spaceship);
    destroy_bitmap(spaceship2);
    destroy_bitmap(spaceship3);
    destroy_bitmap(spaceship4);
    destroy_bitmap(buffer);
    return 0;

}
END_OF_MAIN()

我添加了两个新函数，它们是“load_externs”，它们将加载位图和“initialize”，它将初始化 allegro、图形等。现在，当我编译它时，我发现没有定义 BITMAP 的错误，如宇宙飞船、缓冲区等.虽然，我在int main中添加了函数：load_externs(); 最重要的是，它没有初始化 allegro，这意味着它没有读取我在 int main() 中添加的函数，但为什么呢？我可能在这里遗漏了一些东西，我会很感激一些帮助，谢谢。:)

编辑：我不能在 allegro.cc 上问这个问题，因为我已经在那里开了一个帐户，但我无法用它登录，当我创建另一个帐户时也发生了同样的情况。我不断收到登录错误......：/但是......我知道stackoverflow的优秀成员总是在这里提供帮助。:D

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1 回答 1

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您已经在 中创建了位图局部变量load_externs，它们在其他函数中将不可见，例如main.

最快的解决方案是 makebuffer等spaceship全局。

于 2013-10-29T15:00:33.580 回答