how to create input(like cin) under allegro?

how to create input(like cin) under allegro?

xboxut

Member #4,290

February 2004

hi,
my leveleditor use many script and i must use a text input to write my maps event.i don't know how to create one.can you help me to make a string input under allegro graphic mode (like era of magic when u choose your name)?
thank u very much and sorry for my english

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sorry for my poor english :p

23yrold3yrold

Member #1,134

March 2001

In C++:

1/ edittext.cpp
2#include <allegro.h>
3#include <string>
4using namespace std;
5 
6#define WHITE makecol(255, 255, 255)
7 
8int main()
9{
 // typical Allegro initialization
 allegro_init();
 install_keyboard();
 set_gfx_mode(GFX_AUTODETECT, 320, 240, 0, 0);
14 
 // all variables are here
 BITMAP* buffer = create_bitmap(320, 240); // initialize the double buffer
 string  edittext;                         // an empty string for editting
 string::iterator iter = edittext.begin(); // string iterator
 int     caret  = 0;                       // tracks the text caret
 bool    insert = true;                    // true of should text be inserted
 
 // the game loop
 do
 {
    while(keypressed())
    {
       int  newkey   = readkey();
       char ASCII    = newkey & 0xff;
       char scancode = newkey >> 8;
30 
       // a character key was pressed; add it to the string
       if(ASCII >= 32 && ASCII <= 126)
       {
          // add the new char, inserting or replacing as need be
          if(insert || iter == edittext.end())
             iter = edittext.insert(iter, ASCII);
          else
             edittext.replace(caret, 1, 1, ASCII);
39 
          // increment both the caret and the iterator
          caret++;
          iter++;
       }
       // some other, "special" key was pressed; handle it here
       else
          switch(scancode)
          {
             case KEY_DEL:
                if(iter != edittext.end()) iter = edittext.erase(iter);
             break;
51 
             case KEY_BACKSPACE:
                if(iter != edittext.begin())
                {
                   caret--;
                   iter--;
                   iter = edittext.erase(iter);
                }
             break;
          
             case KEY_RIGHT:
                if(iter != edittext.end())   caret++, iter++;
             break;
          
             case KEY_LEFT:
                if(iter != edittext.begin()) caret--, iter--;
             break;
          
             case KEY_INSERT:
                if(insert) insert = 0; else insert = 1;
             break;
72 
             default:
74 
             break;
          }
    }
    
    // clear screen
    clear(buffer);
81 
    // output the string to the screen
    textout(buffer, font, edittext.c_str(), 0, 10, WHITE);
84 
    // output some stats using Allegro's printf functions
    textprintf(buffer, font,  0, 20, WHITE, "length:   %d", edittext.length());
    textprintf(buffer, font,  0, 30, WHITE, "capacity: %d", edittext.capacity());
    textprintf(buffer, font,  0, 40, WHITE, "empty?:   %d", edittext.empty());
    if(insert)
       textout(buffer, font, "Inserting", 0, 50, WHITE);
    else
       textout(buffer, font, "Replacing", 0, 50, WHITE);
93 
    // draw the caret
    vline(buffer, caret * 8, 8, 18, WHITE);
96 
    // blit to screen
    blit(buffer, screen, 0, 0, 0, 0, 320, 240);
99 
 }while(!key[KEY_ESC]); // end of game loop
 
 // clean up
 destroy_bitmap(buffer);
 set_gfx_mode(GFX_TEXT, 0, 0, 0, 0);
 
 return 0;
107}
108END_OF_MAIN()

In C:

1// edittext.c
2#include <allegro.h>
3 
4#define BUFFERSIZE 128
5 
6int main()
7{
 BITMAP* buffer = NULL;
 char    edittext[BUFFERSIZE];
 int     caret  = 0;
11 
 /* typical Allegro initialization */
 allegro_init();
 install_keyboard();
 set_gfx_mode(GFX_AUTODETECT, 320, 240, 0, 0);
16 
 buffer = create_bitmap(320, 240);
18 
 do
 {
    if(keypressed())
    {
       int  newkey   = readkey();
       char ASCII    = newkey & 0xff;
       char scancode = newkey >> 8;
26 
       /* a character key was pressed; add it to the string */
       if(ASCII >= 32 && ASCII <= 126)
       {
      if(caret < BUFFERSIZE - 1)
      {
        edittext[caret] = ASCII;
        caret++;
        edittext[caret] = '\0';
      }
       }
       else if(scancode == KEY_BACKSPACE)
       {
          if (caret > 0) caret--;
          edittext[caret] = '\0';
       }
    }
    
    /* all drawing goes here */
    clear(buffer);
    textout(buffer, font, edittext, 0, 10, makecol(255, 255, 255));
    vline(buffer, caret * 8, 8, 18, makecol(255, 255, 255));
    blit(buffer, screen, 0, 0, 0, 0, 320, 240);
49 
 }
 while(!key[KEY_ESC]);
 
 destroy_bitmap(buffer);
54 
 return 0;
56}
57END_OF_MAIN()

--
Software Development == Church Development
Step 1. Build it.
Step 2. Pray.

ReyBrujo

Moderator

January 2001

You usually setup a dialog structure, with a d_edit_proc procedure that will allow the user edit it, like:

DIALOG dlg[] =
    { d_clear_proc,      0,    0,    0,    0,    255,  0,    0,    0,       0,                      0,    NULL,             NULL, NULL  },
    { d_edit_proc,       80,   32,   512,  48,   255,  0,    0,    0,       sizeof(the_string)-1,   0,    the_string,       NULL, NULL  },
    { NULL,              0,    0,    0,    0,    0,    0,    0,    0,       0,                      0,    NULL,             NULL, NULL  }
};

(Edited: fixed error, code).

--
RB
光子「あたしただ…奪う側に回ろうと思っただけよ」
Mitsuko's last words, Battle Royale

xboxut

Member #4,290

February 2004

thank you very much.i try the 2 method.i post my level editor when i finish it.i add you in credits

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sorry for my poor english :p