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Resize window
AleX-G Squadron
Member #13,593
October 2011
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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 }

www.anothergames.com

Arthur Kalliokoski
Second in Command
February 2005
avatar

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);
  }

“Throughout history, poverty is the normal condition of man. Advances which permit this norm to be exceeded — here and there, now and then — are the work of an extremely small minority, frequently despised, often condemned, and almost always opposed by all right-thinking people. Whenever this tiny minority is kept from creating, or (as sometimes happens) is driven out of a society, the people then slip back into abject poverty. This is known as "bad luck.”

― Robert A. Heinlein

AleX-G Squadron
Member #13,593
October 2011
avatar

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"}606487

www.anothergames.com

Arthur Kalliokoski
Second in Command
February 2005
avatar

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.

“Throughout history, poverty is the normal condition of man. Advances which permit this norm to be exceeded — here and there, now and then — are the work of an extremely small minority, frequently despised, often condemned, and almost always opposed by all right-thinking people. Whenever this tiny minority is kept from creating, or (as sometimes happens) is driven out of a society, the people then slip back into abject poverty. This is known as "bad luck.”

― Robert A. Heinlein

AleX-G Squadron
Member #13,593
October 2011
avatar

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);

www.anothergames.com

Arthur Kalliokoski
Second in Command
February 2005
avatar

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{ 6 ALLEGRO_DISPLAY *display = NULL; 7 ALLEGRO_DISPLAY_MODE desktop; 8 9 ALLEGRO_EVENT_QUEUE *queue; 10 ALLEGRO_TIMER *timer; 11 ALLEGRO_EVENT event; 12 ALLEGRO_PATH *path; 13 int window_width = 100; 14 int window_height = 100; 15 int resize; 16 int quit = 0; 17 18 if(!al_init()) 19 { 20 al_show_native_message_box(display, "Error", "Failed to initialize Allegro", "", NULL, 0); 21 return 1; 22 } 23 24 //If user runs it from somewhere else... 25 path = al_get_standard_path(ALLEGRO_RESOURCES_PATH); 26 al_change_directory(al_path_cstr(path,ALLEGRO_NATIVE_PATH_SEP)); 27 28 al_install_keyboard(); 29 al_get_display_mode(0, &desktop); 30 al_set_new_window_position((desktop.width-window_width)/2,(desktop.height-window_height)/2); 31 32 display = al_create_display(window_width,window_height); 33 if(!display) 34 { 35 al_show_native_message_box(display, "Error", "Unable to set display mode", "", NULL, 0); 36 return -1; 37 } 38 39 al_set_target_backbuffer(display); 40 41 al_install_mouse(); 42 43 timer = al_create_timer(1. / 60.); 44 45 queue = al_create_event_queue(); 46 al_register_event_source(queue,al_get_keyboard_event_source()); 47 al_register_event_source(queue,al_get_display_event_source(display)); 48 al_register_event_source(queue,al_get_timer_event_source(timer)); 49 al_register_event_source(queue, al_get_mouse_event_source()); 50 al_hide_mouse_cursor(display); 51 52 resize = al_show_native_message_box(display, "Change display", "Are you sure?", 53 "Do you want to change your display to 600x600?", "Of course|No", ALLEGRO_MESSAGEBOX_YES_NO); 54 55 if(resize == 1) 56 { 57 window_width = 600; 58 window_height = 600; 59 al_set_new_window_position((desktop.width-window_width)/2,(desktop.height-window_height)/2); //doesn't work here???!! 60 al_resize_display(display, window_width,window_height); 61 } 62 al_start_timer(timer); 63 64 while(quit == 0) 65 { 66 al_wait_for_event(queue, &event); 67 switch(event.type) 68 { 69 case ALLEGRO_EVENT_DISPLAY_CLOSE: 70 quit = 1; 71 72 case ALLEGRO_EVENT_KEY_DOWN: 73 if(event.keyboard.keycode == ALLEGRO_KEY_ESCAPE) 74 quit = 1; 75 break; 76 77 case ALLEGRO_EVENT_TIMER: 78 if(al_is_event_queue_empty(queue)) 79 { 80 al_flip_display(); 81 } 82 break; 83 } 84 } 85 86 al_destroy_display(display); 87 display = 0; 88 89 return 0; 90}

“Throughout history, poverty is the normal condition of man. Advances which permit this norm to be exceeded — here and there, now and then — are the work of an extremely small minority, frequently despised, often condemned, and almost always opposed by all right-thinking people. Whenever this tiny minority is kept from creating, or (as sometimes happens) is driven out of a society, the people then slip back into abject poverty. This is known as "bad luck.”

― Robert A. Heinlein

AleX-G Squadron
Member #13,593
October 2011
avatar

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"}606488

www.anothergames.com

Arthur Kalliokoski
Second in Command
February 2005
avatar

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. :-/

“Throughout history, poverty is the normal condition of man. Advances which permit this norm to be exceeded — here and there, now and then — are the work of an extremely small minority, frequently despised, often condemned, and almost always opposed by all right-thinking people. Whenever this tiny minority is kept from creating, or (as sometimes happens) is driven out of a society, the people then slip back into abject poverty. This is known as "bad luck.”

― Robert A. Heinlein

AleX-G Squadron
Member #13,593
October 2011
avatar

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 :o

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?

www.anothergames.com

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