想一些文字抹去自身在遊戲

Question

好了，所以只是有點想知道一個訣竅來解決這個問題。

所以我想文本「窗口將在10秒內關閉」通過循環抹去每次去的時間和下一個數字倒計時更換。但我現在得到的是重疊的。

我只是想爲它去它倒計時和顯示。

//FILE: Main.cpp 
//PROGR: Hank Bates 
//PURPOSE: To display text on screen for 10 seconds. 
//EXTRA ADD ON FILES: Slendermanswriting.ttf 
//     PrometheusSiren.wav 


#include <allegro5\allegro.h> 
#include <allegro5\allegro_font.h> 
#include <allegro5\allegro_ttf.h> 
#include <allegro5\allegro_native_dialog.h> 
#include <allegro5\allegro_audio.h> 
#include <allegro5\allegro_acodec.h> 


int main(void) 
{ 
    //summon the fonts and stuff 
    ALLEGRO_DISPLAY *display = NULL; 
    ALLEGRO_FONT *font50; 
    ALLEGRO_FONT *font36; 
    ALLEGRO_FONT *font18; 
    ALLEGRO_SAMPLE *song; 
    int a = 100; 


    if (!al_init()) 
    { 
     al_show_native_message_box(NULL, NULL, NULL, 
      "failed to initialize allegro!", NULL, NULL); 
     return -1; 
    } 

    //set up some of the display settings 
    al_set_new_display_flags(ALLEGRO_WINDOWED | ALLEGRO_RESIZABLE); 
    display = al_create_display(640, 480); 
    al_set_window_title(display, "A bad horror game"); 

    if (!display) 
    { 
     al_show_native_message_box(NULL, NULL, NULL, 
      "failed to initialize display!", NULL, NULL); 
     return -1; 
    } 

    al_init_font_addon(); 
    al_init_ttf_addon(); 

    //Install Slender Man font here 
    font50 = al_load_font("Slendermanswriting.ttf", 50, 0); 
    font36 = al_load_font("Slendermanswriting.ttf", 36, 0); 
    font18 = al_load_font("Slendermanswriting.ttf", 18, 0); 

    //set up music here 
    al_install_audio(); 
    al_init_acodec_addon(); 
    al_reserve_samples(1); 

    song = al_load_sample("PrometheusSiren.wav"); 

    //play song this will loop around and around like a record man! 
    al_play_sample(song, 1, 0, 1, ALLEGRO_PLAYMODE_LOOP, NULL); 

    int screen_w = al_get_display_width(display); 
    int screen_h = al_get_display_height(display); 

    al_clear_to_color(al_map_rgb(0, 0, 0)); 

    al_draw_text(font50, al_map_rgb(255, 0, 0), 12, 50, 0, "SLENDER MAN IS COMING"); 
    al_draw_text(font36, al_map_rgb(255, 5, 10), 200, 100, 0, "RUN AND HIDE"); 
    al_draw_text(font18, al_map_rgb(100, 15, 18), 150, 150, 0, "ENJOY THE PROMETHEUS SIREN MUSIC"); 

    int timer = 10; 
while (timer != 0) 
    { 


al_draw_textf(font18, al_map_rgb(255, 255, 255), screen_w/3, 300, ALLEGRO_ALIGN_CENTRE, 
     "TURN UP YOUR VOLUME TO %i PRECENT!", a); 

    al_draw_textf(font18, al_map_rgb(255, 255, 255), screen_w/2, 400, ALLEGRO_ALIGN_CENTRE, 
     "WINDOW WILL CLOSE IN %i seconds!", timer); 

    al_flip_display(); 


     al_rest(1.0); 
     timer = timer - 1; 
    } 



    al_rest(10.0); 

    //destroy stuff 
    al_destroy_font(font18); 
    al_destroy_font(font50); 
    al_destroy_font(font36); 
    al_destroy_display(display); 
    al_destroy_sample(song); 
    //pew pew pew, bang.... all destoryed :) 

    return 0; 
} 

Answer 1

將背景清晰和前三個文本輸出移動到主循環中。你需要重畫每一幀的所有內容。

Answer 2

//FILE: Main.cpp 
//PROGR: Hank Bates 
//PURPOSE: To display text on screen for 10 seconds. 
//EXTRA ADD ON FILES: Slendermanswriting.ttf 
//     PrometheusSiren.wav 


#include <allegro5\allegro.h> 
#include <allegro5\allegro_font.h> 
#include <allegro5\allegro_ttf.h> 
#include <allegro5\allegro_native_dialog.h> 
#include <allegro5\allegro_audio.h> 
#include <allegro5\allegro_acodec.h> 




int main(void) 
{ 
    //summon the fonts and stuff 
    ALLEGRO_DISPLAY *display = NULL; 
    ALLEGRO_FONT *font50; 
    ALLEGRO_FONT *font36; 
    ALLEGRO_FONT *font18; 
    ALLEGRO_SAMPLE *song; 
    int a = 100; 
    int time_left = 10; 

    //test redaw 
    ALLEGRO_EVENT_QUEUE *event_queue = NULL; 
    ALLEGRO_TIMER *timer = NULL; 
    bool redraw = true; 

    if (!al_init()) 
    { 
     al_show_native_message_box(NULL, NULL, NULL, 
      "failed to initialize allegro!", NULL, NULL); 
     return -1; 
    } 

    //set up some of the display settings 
    al_set_new_display_flags(ALLEGRO_WINDOWED | ALLEGRO_RESIZABLE); 
    display = al_create_display(640, 480); 
    al_set_window_title(display, "A bad horror game"); 

    if (!display) 
    { 
     al_show_native_message_box(NULL, NULL, NULL, 
      "failed to initialize display!", NULL, NULL); 
     return -1; 
    } 

    al_init_font_addon(); 
    al_init_ttf_addon(); 

    //Install Slender Man font here 
    font50 = al_load_font("Slendermanswriting.ttf", 50, 0); 
    font36 = al_load_font("Slendermanswriting.ttf", 36, 0); 
    font18 = al_load_font("Slendermanswriting.ttf", 18, 0); 

    //set up music here 
    al_install_audio(); 
    al_init_acodec_addon(); 
    al_reserve_samples(1); 

    //upload the song here 
    song = al_load_sample("PrometheusSiren.wav"); 

    //play song this will loop around and around like a record man! 
    al_play_sample(song, 1, 0, 1, ALLEGRO_PLAYMODE_LOOP, NULL); 

    int screen_w = al_get_display_width(display); 
    int screen_h = al_get_display_height(display); 

    al_clear_to_color(al_map_rgb(0, 0, 0)); 

    while (time_left != 0) 
    { 
     al_flip_display(); 
     al_clear_to_color(al_map_rgb(0, 0, 0)); 

     al_draw_text(font50, al_map_rgb(255, 0, 0), 12, 50, 0, "SLENDER MAN IS COMING"); 
     al_draw_text(font36, al_map_rgb(255, 5, 10), 200, 100, 0, "RUN AND HIDE"); 
     al_draw_text(font18, al_map_rgb(100, 15, 18), 150, 150, 0, "ENJOY THE PROMETHEUS SIREN MUSIC"); 

     al_draw_textf(font18, al_map_rgb(255, 255, 255), screen_w/3, 300, ALLEGRO_ALIGN_CENTRE, 
     "TURN UP YOUR VOLUME TO %i PRECENT!", a); 

     al_draw_textf(font18, al_map_rgb(255, 255, 255), screen_w/2, 400, ALLEGRO_ALIGN_CENTRE, 
      "WINDOW WILL CLOSE IN %i seconds!", time_left); 

     al_rest(1.0); 
     time_left = time_left - 1; 
    } 

    al_flip_display(); 
    al_rest(0.0); 

    //destroy stuff 
    al_destroy_font(font18); 
    al_destroy_font(font50); 
    al_destroy_font(font36); 
    al_destroy_display(display); 
    al_destroy_sample(song); 
    al_destroy_timer(timer); 
    //pew pew pew, bang.... all destoryed :) 

    return 0; 
} 

喲我明白了。感謝您的正確問題。