[A5] Odds and Ends

[A5] Odds and Ends

Specter Phoenix

Member #1,425

July 2001

Just seeking help and advice for these last three issues.

I've hit some issues I'm trying to figure out and needed some advice on. I can't seem to do a splash screen that will display until space bar is pressed, at which point the game starts.

Trying to get a screenshot function working based off the A5 Wiki source and wanted to see if anyone had advice on that. ( http://wiki.allegro.cc/index.php?title=Allegro_5_Screenshot )

Trying to implement a high score and debating on the format and needing advice. Should I just do the custom 3 initials with high score with top 10 to 20 high scores?

I realize my code is terrible and rand() obsessed, so try not to rip me a new one too much:

#SelectExpand
   1#include "init.h"
   2#include "sprite.h"
   3#include "scrnshot.h"
   4#include <fstream>
   5#include <cstdio>
   6#include <cstdlib>
   7#include <ctime>
   8
   9const int SCREEN_H = 480;
  10const int SCREEN_W = 640;
  11#define SCREEN_WIDTH 640
  12#define SCREEN_HEIGHT 480
  13#define BLOCKSIZE 32
  14
  15enum MYKEYS{ KEY_SPACE, KEY_F1, KEY_F12 };
  16bool key[3] = { false, false, false };
  17
  18int main()
  19{
  /* initialize random seed: */
  srand(time(NULL));
  22
  // int iSecret = rand() % 608 + 16;
  int aiSprite = rand() % 5;
  int stragSpr = rand() % 5;
  int wolverSpr = rand() % 5;
  int mcbSprite = rand() % 5;
  int dpoolSpr = rand() % 5;
  // int randYVel = rand() % 6 + 1;
  30
  int ticks = 0;
  int score = 0;
  int misses = 0;
  34
  GAME game;
  init(&game);
  37
  SPRITE playerShip;
  SPRITE splashScreen;
  SPRITE help;
  SPRITE info;
  SPRITE aiShip, straggler, wolverine, mcbride, dpool;
  SPRITE explosion;
  44
  splashScreen.loadSpriteSheets("data/splash.png");
  splashScreen.setCoord(0, 0);
  splashScreen.setData(640, 480, 0, 0, 0);
  48
  help.loadSpriteSheets("data/help.png");
  help.setCoord(0, 0);
  help.setData(640, 480, 0, 0, 0);
  52
  info.loadSpriteSheets("data/dirSheet.png");
  info.setCoord(512, 448);
  info.setData(160, 32, 0, 0, 2);
  56
  playerShip.loadSpriteSheets("data/player.png");
  playerShip.setData(32, 32, 4, 4, 0);
  59
  60
  explosion.loadSpriteSheets("data/explSheet.png");
  explosion.setData(32, 32, 0, 0, 3);
  63
  aiShip.loadSpriteSheets("data/shipSheet.png");
  straggler.loadSpriteSheets("data/shipSheet.png");
  wolverine.loadSpriteSheets("data/shipSheet.png");
  mcbride.loadSpriteSheets("data/shipSheet.png");
  dpool.loadSpriteSheets("data/shipSheet.png");
  69
  aiShip.setCoord(rand() % 608 + 16, -20);
  straggler.setCoord(rand() % 608 + 16, -20);
  wolverine.setCoord(rand() % 608 + 16, -20);
  mcbride.setCoord(rand() % 608 + 16, -20);
  dpool.setCoord(rand() % 608 + 16, -20);
  75
  aiShip.setData(32, 32, 0, rand() % 6 + 1, 4);
  straggler.setData(32, 32, 0, rand() % 6 + 1, 4);
  wolverine.setData(32, 32, 0, rand() % 6 + 1, 4);
  mcbride.setData(32, 32, 0, rand() % 6 + 1, 4);
  dpool.setData(32, 32, 0, rand() % 6 + 1, 4);
  81
  aiShip.points(5);
  straggler.points(10);
  wolverine.points(15);
  mcbride.points(20);
  dpool.points(25);
  87
  al_hide_mouse_cursor(game.display);
  89
  bool redraw = true;
  bool doexit = false;
  92
  al_set_window_title(game.display,"Global Destruction");
  al_set_window_position(game.display, 20, 20);
  95
  al_register_event_source(game.event_queue, al_get_display_event_source(game.display));
al_register_event_source(game.event_queue, al_get_timer_event_source(game.timer));
al_register_event_source(game.event_queue, al_get_keyboard_event_source());
al_register_event_source(game.event_queue, al_get_mouse_event_source());
 100
al_clear_to_color(al_map_rgb(0, 0, 0));
al_flip_display();
al_start_timer(game.timer);
 104
while (!doexit)
{
  ALLEGRO_EVENT ev;
  al_wait_for_event(game.event_queue, &ev);
 109
 110
  if(ev.type == ALLEGRO_EVENT_TIMER)
  {
    ticks++;
    aiShip.movement();
    straggler.movement();
    wolverine.movement();
    mcbride.movement();
    dpool.movement();
 119
          if(Collision(playerShip, aiShip))
          {
            explosion.setCoord(aiShip.getX(), aiShip.getY());
            explosion.animate(ticks, 4.5);
            aiShip.setData(32, 32, 0, (rand() % 6 + 1), 4);
            aiShip.setCoord((rand() % 608 + 16), -20);
            aiSprite = rand() % 5;
            al_flip_display();
            score = score + aiShip.getScore();
          }
 130
          if(aiShip.getY() > SCREEN_H)
          {
              aiShip.setData(32, 32, 0, (rand() % 6 + 1), 4);
              aiShip.setCoord((rand() % 608 + 16), -20);
              al_flip_display();
              aiSprite = rand() % 5;
              misses++;
          }
 139
          if(Collision(playerShip, straggler))
          {
              explosion.setCoord(straggler.getX(), straggler.getY());
              explosion.animate(ticks, 4.5);
              straggler.setData(32, 32, 0, (rand() % 6 + 1), 4);
              straggler.setCoord((rand() % 608 + 16), -20);
              stragSpr = rand() % 5;
              al_flip_display();
              score = score + straggler.getScore();
          }
 150
          if(straggler.getY() > SCREEN_H)
          {
              straggler.setData(32, 32, 0, (rand() % 6 + 1), 4);
              straggler.setCoord((rand() % 608 + 16), -20);
              al_flip_display();
              stragSpr = rand() % 5;
              misses++;
          }
 159
          if(Collision(playerShip, wolverine))
          {
              explosion.setCoord(wolverine.getX(), wolverine.getY());
              explosion.animate(ticks, 4.5);
              wolverine.setData(32, 32, 0, (rand() % 6 + 1), 4);
              wolverine.setCoord((rand() % 608 + 16), -20);
              wolverSpr = rand() % 5;
              al_flip_display();
              score = score + wolverine.getScore();
          }
 170
          if(wolverine.getY() > SCREEN_H)
          {
              wolverine.setData(32, 32, 0, (rand() % 6 + 1), 4);
              wolverine.setCoord((rand() % 608 + 16), -20);
              al_flip_display();
              wolverSpr = rand() % 5;
              misses++;
          }
 179
          if(Collision(playerShip, mcbride))
          {
              explosion.setCoord(mcbride.getX(), mcbride.getY());
              explosion.animate(ticks, 4.5);
              mcbride.setData(32, 32, 0, (rand() % 6 + 1), 4);
              mcbride.setCoord((rand() % 608 + 16), -20);
              mcbSprite = rand() % 5;
              al_flip_display();
              score = score + mcbride.getScore();
          }
 190
          if(mcbride.getY() > SCREEN_H)
          {
              mcbride.setData(32, 32, 0, (rand() % 6 + 1), 4);
              mcbride.setCoord((rand() % 608 + 16), -20);
              al_flip_display();
              mcbSprite = rand() % 5;
              misses++;
          }
 199
          if(Collision(playerShip, dpool))
          {
              explosion.setCoord(dpool.getX(), dpool.getY());
              explosion.animate(ticks, 4.5);
              dpool.setData(32, 32, 0, (rand() % 6 + 1), 4);
              dpool.setCoord((rand() % 608 + 16), -20);
              dpoolSpr = rand() % 5;
              al_flip_display();
              score = score + dpool.getScore();
          }
 210
          if(dpool.getY() > SCREEN_H)
          {
              dpool.setData(32, 32, 0, (rand() % 6 + 1), 4);
              dpool.setCoord((rand() % 608 + 16), -20);
              al_flip_display();
              dpoolSpr = rand() % 5;
              misses++;
          }
 219
          if(misses == 10)
              doexit = true;
 222
    redraw = true;
  }
  else if (ev.type == ALLEGRO_EVENT_DISPLAY_CLOSE)
  {
    break;
  }
  else if(ev.type == ALLEGRO_EVENT_MOUSE_AXES ||
               ev.type == ALLEGRO_EVENT_MOUSE_ENTER_DISPLAY)
      {
          playerShip.setCoord(ev.mouse.x - 16, ev.mouse.y - 16);
      }
      else if(ev.type == ALLEGRO_EVENT_KEY_DOWN)
  {
    switch(ev.keyboard.keycode)
    {
              case ALLEGRO_KEY_SPACE:
                  key[KEY_SPACE] = true;
                  break;
              case ALLEGRO_KEY_F1:
                  key[KEY_F1] = true;
                  break;
              case ALLEGRO_KEY_F12:
                  key[KEY_F12] = true;
                  break;
    }
  }
  else if(ev.type == ALLEGRO_EVENT_KEY_UP)
  {
    switch(ev.keyboard.keycode)
    {
        case ALLEGRO_KEY_SPACE:
                  key[KEY_SPACE] = false;
                  break;
              case ALLEGRO_KEY_F1:
                  key[KEY_F1] = false;
                  break;
              case ALLEGRO_KEY_F12:
                  key[KEY_F12] = false;
                  break;
      case ALLEGRO_KEY_ESCAPE:
        doexit = true;
      break;
    }
  }
 267
  if(redraw && al_is_event_queue_empty(game.event_queue))
  {
 270
    redraw = false;
    al_clear_to_color(al_map_rgb(0, 0, 0));
 273
    playerShip.draw();
          aiShip.randDraw(aiSprite);
          straggler.randDraw(stragSpr);
          wolverine.randDraw(wolverSpr);
          mcbride.randDraw(mcbSprite);
          dpool.randDraw(dpoolSpr);
 280
          // draw score over everything!!!
          al_draw_textf(game.font, al_map_rgb(255, 255, 255), SCREEN_W / 2, SCREEN_H - 20, ALLEGRO_ALIGN_CENTER, "%i", score);
 283
    al_flip_display();
  }
}
 287
al_clear_to_color(al_map_rgb(0, 0, 0));
al_flip_display();
al_destroy_display(game.display);
 291
  return 0;
 293}

Edgar Reynaldo

Major Reynaldo

May 2007

void fn_wait_for_key(ALLEGRO_EVENT_QUEUE* queue) {
   ALLEGRO_EVENT e;
   do {
      al_wait_for_event(queue , &e);
   } while (e.type != ALLEGRO_EVENT_KEY_DOWN);
}


// in main

// oh need to wait for a key here :
fn_wait_for_key(my_event_queue);

Eagle and Allegro 5 binaries | Older Allegro 4 and 5 binaries | Allegro 5 compile guide
King Piccolo will make it so Then I could just flip it with some sweet, sweet matrix math. In either case, I’ll ride this wagon until the wheels fall off. Thanks to those that keep it running

Trent Gamblin

Member #261

April 2000

The simplest possible way to do a splash screen like that is like this (Oh come on, best practices don't really matter for such a small issue! But if you wanted to extend this somehow it would be bad...)

for (;;) {
   al_draw_bitmap(splash, 0, 0, 0);
   al_flip_display();
   ALLEGRO_KEYBOARD_STATE kbstate;
   al_get_keyboard_state(&kbstate);
   if (al_key_down(&kbstate, ALLEGRO_KEY_SPACE)) {
      break;
   }
   al_rest(1.0/60.0);
}

Kris Asick

Member #1,424

July 2001

Hmm... well, the way I code my games is to have a "system" variable which tracks which primary system to run code through. If the system variable changes, then the next time there's a system loop it will run completely different code. For a splash screen, the simplest thing to do is create an entirely separate code section just for it, then jump to your game code following. At the moment, everything you do is in main(), whereas my main() simply calls init code then runs a while() + switch() loop, accessing various system functions depending on the system variable state until I set the system variable to a shutdown state, which exits the while() loop and calls all the shutdown functions.

Kinda like this pseudocode:

while (system_state != SYS_SHUTDOWN) switch (system_state)
{
    case SYS_SPLASHSCREEN: RunSplashScreen(); break;
    case SYS_MAINMENU:     RunMainMenu(); break;
    case SYS_OPTIONSMENU:  RunOptions(); break;
    case SYS_RUNGAME:      RunGame(); break;
}

For a screenshot function, just keep a numerical variable going to add onto your screenshot's filename and advance it every time you save a screen. Before you actually save the screenshot, check if the file exists. If it does, add the variable up by 1 and check again. Most screenshot functions are attached to the F12 Key, though the Print Screen key works too, keeping in mind that Windows will take a screenshot itself and put it in the clipboard when you press that key.

As for high scores, this is going to depend on a number of factors. If you want your game to have joystick/gamepad support you should show a screen of letter selectors that you can move through with the joystick/gamepad, or even the arrow keys on the keyboard, though you should still detect actual alphanumeric keypresses. I'd only go with initials if you intend this game to feel like an arcade game, otherwise have at least 8 characters allowed. Top 20 takes a lot of screen space and can actually look less impressive than a Top 10, but this is more a matter of preference really.

--- Kris Asick (Gemini)
--- http://www.pixelships.com

Specter Phoenix

Member #1,425

July 2001

Well I tried this method to no avail:

for(;;)
{
     splashScreen.draw();
     info.animate(ticks, 2);
     al_flip_display();
     if(key[KEY_SPACE])
           break;
}

playerShip.draw();
// ...draw other ships

Tried Trentg's code and it just made it so the button had to be held to play so it flashed. Could be putting the code in the wrong spot or missing something logic wise.