Resize window

AleX-G Squadron

I am having problem catching the ALLEGRO_MESSAGEBOX_YES_NO return value.
How am i supposed to get its value, so when the user press yes, the window is resized?

Here is the code i have made.

#SelectExpand
  1int resize = ALLEGRO_MESSAGEBOX_YES_NO;
  2
  3  int box = al_show_native_message_box(display, "Change display", "Are you sure?", 
  4    "Do you want to change your display to 600x600?", "Of course|No", resize);
  5
  6  if(resize == 1)
  7  {
  8    al_resize_display(display, 600, 600);
  9  }

Arthur Kalliokoski

int resize;

  resize = al_show_native_message_box(display, "Change display", "Are you sure?", 
    "Do you want to change your display to 600x600?", "Of course|No", ALLEGRO_MESSAGEBOX_YES_NO);

  if(resize == 1)
  {
    al_resize_display(display, 600, 600);
  }

AleX-G Squadron

I tried it but i get this error on visual studio 2012

{"name":"606487","src":"\/\/djungxnpq2nug.cloudfront.net\/image\/cache\/0\/4\/0409376e1c55faeb0c7fcd20ac88a3b6.png","w":441,"h":319,"tn":"\/\/djungxnpq2nug.cloudfront.net\/image\/cache\/0\/4\/0409376e1c55faeb0c7fcd20ac88a3b6"}

Arthur Kalliokoski

Your 'display' pointer is bad, but you didn't get this error before because ALLEGRO_MESSAGEBOX_YES_NO isn't equal to 1, so the al_resize_display() was never called.

AleX-G Squadron

This is my display pointer. Is it bad?
ALLEGRO_DISPLAY *display = NULL;

Even if i change its parameters to
ALLEGRO_DISPLAY *display(int width = 300, int height = 200);

It will show an error on the first parameter
al_resize_display(display, 600, 600);

Arthur Kalliokoski

AleX-G Squadron said:

This is my display pointer. Is it bad?

ALLEGRO_DISPLAY *display = NULL;

It shouldn't be NULL after you've successfully created a display with it.

[EDIT]

You need to create a display to resize it.

#SelectExpand
  1#include <allegro5/allegro.h>
  2#include <allegro5/allegro_native_dialog.h>
  3
  4int main(int argc, char **argv)
  5{
ALLEGRO_DISPLAY *display = NULL;
ALLEGRO_DISPLAY_MODE desktop;
  8
ALLEGRO_EVENT_QUEUE *queue;
ALLEGRO_TIMER *timer;
ALLEGRO_EVENT event;
ALLEGRO_PATH *path;
int window_width = 100;
int window_height = 100;
int resize;
int quit = 0;

if(!al_init())
{
  al_show_native_message_box(display, "Error", "Failed to initialize Allegro", "", NULL, 0);
  return 1;
}
 23
//If user runs it from somewhere else...
path = al_get_standard_path(ALLEGRO_RESOURCES_PATH);
al_change_directory(al_path_cstr(path,ALLEGRO_NATIVE_PATH_SEP));
 27
al_install_keyboard();
al_get_display_mode(0, &desktop);
al_set_new_window_position((desktop.width-window_width)/2,(desktop.height-window_height)/2);

display = al_create_display(window_width,window_height);
if(!display)
{
  al_show_native_message_box(display, "Error", "Unable to set display mode", "", NULL, 0);
  return -1;
}

al_set_target_backbuffer(display);

al_install_mouse();
      
timer = al_create_timer(1. / 60.);
 44
queue = al_create_event_queue();
al_register_event_source(queue,al_get_keyboard_event_source());
al_register_event_source(queue,al_get_display_event_source(display));
al_register_event_source(queue,al_get_timer_event_source(timer));
al_register_event_source(queue, al_get_mouse_event_source());
al_hide_mouse_cursor(display);

resize = al_show_native_message_box(display, "Change display", "Are you sure?", 
  "Do you want to change your display to 600x600?", "Of course|No", ALLEGRO_MESSAGEBOX_YES_NO);
 54
if(resize == 1)
{
  window_width = 600;
  window_height = 600;
  al_set_new_window_position((desktop.width-window_width)/2,(desktop.height-window_height)/2);  //doesn't work here???!!
  al_resize_display(display, window_width,window_height);
}
al_start_timer(timer);
 63
while(quit == 0)
{
  al_wait_for_event(queue, &event);
  switch(event.type)
  {
    case ALLEGRO_EVENT_DISPLAY_CLOSE:
      quit = 1;
 71
    case ALLEGRO_EVENT_KEY_DOWN:
      if(event.keyboard.keycode == ALLEGRO_KEY_ESCAPE)
        quit = 1;
      break;
        
    case ALLEGRO_EVENT_TIMER:
    if(al_is_event_queue_empty(queue))
    {
      al_flip_display();
    }
    break;
  }
}

al_destroy_display(display);
display = 0;
 88
return 0;
 90}

AleX-G Squadron

I got it to work, but i get a weird thing in the display
This happens only after the screen is resized. Otherwise if i press no it wont happen.
As the screen shows it, they are the bounders of the smaller display i created it.

Edit: I didnt get this error with your code

{"name":"606488","src":"\/\/djungxnpq2nug.cloudfront.net\/image\/cache\/e\/e\/ee68b60bdb4ade90c9d5119dd2d2d1b9.png","w":301,"h":394,"tn":"\/\/djungxnpq2nug.cloudfront.net\/image\/cache\/e\/e\/ee68b60bdb4ade90c9d5119dd2d2d1b9"}

Arthur Kalliokoski

I edited my previous post just when you were posting. Save your code to something else temporarily and try what I posted. It worked OK for me except the window always went to lower right corner of desktop, whether the al_set_new_window_position() was above the resize or not. :-/

AleX-G Squadron

Very weird errors indeed. I will try to find what is the problem with the programs.

Also, when executing your code, it shows in the center of my screen, so it works perfect!

Still, i cannot understand why i get that white think

EDIT: i got it to work, but i used 2 times the al_flip_display();
Is that ok, or it is not recommended?

Here is my code

#SelectExpand
  1#include <allegro5\allegro.h>
  2#include <allegro5\allegro_native_dialog.h>
  3
  4int main (void)
  5{
  6  al_init();
  7  
  8  ALLEGRO_DISPLAY *window = al_create_display(200, 300);
  9
 10  al_flip_display(); // First time!
 11
 12  int resize = al_show_native_message_box(window, "Change display", "Are you sure?", 
 13    "Do you want to change your display to 600x600?", "Of course|No", ALLEGRO_MESSAGEBOX_YES_NO);
 14  
 15  if(resize == 1)
 16  {
 17  al_resize_display(window, 600, 600);
 18  al_flip_display(); // Second time!
 19  }
 20
 21  al_rest(3.0);
 22  
 23  al_destroy_display(window);
 24}

Actually, i was thinking if the user, can specify himself the resolution using a text box, or maybe two. Is it possible?

Thread #610884. Printed from Allegro.cc