Tecnicas de IA - Patrulha
#include "SDL.h"
const int WIDTH = 800; const int HEIGHT = 600; const int FRAME_RATE = 60; const int SPEED = 10; const int SPEED_NPC = 8; const int WALK = 150; const int DISTANCE = 150;
void init(); void input(); void npc(); void draw(); void update(); void close(); Uint32 wait(Uint32 t0); SDL_Surface *changeState();
enum Direction { UP, DOWN, LEFT, RIGHT };
enum StateMachine { PATROL, PURSUIT };
SDL_Surface *screen, *player, *enemy01, *red_box, *green_box; SDL_Rect src_player, dest_player, src_enemy01, dest_enemy01; bool quit; int x, y; Direction walk_dir; StateMachine state_npc;
int main(int argc, char *argv[]) { // Inicializa a SDL init();
// Variaveis
Uint32 t0 = SDL_GetTicks();
// Main Loop
while (!quit)
{
// Input
input();
npc();
// Draw
draw();
// Update
update();
// Fixed Rate
t0 = wait(t0);
}
// Finaliza a SDL
close();
// Sai do programa
exit(0);
}
void init() { if (SDL_Init(SDL_INIT_VIDEO) == -1) { exit(-1); }
screen = SDL_SetVideoMode(WIDTH, HEIGHT, 32, SDL_HWSURFACE|SDL_DOUBLEBUF);
if (screen == NULL)
{
SDL_Quit();
exit(-1);
}
player = SDL_LoadBMP("blue.bmp");
red_box = SDL_LoadBMP("red.bmp");
green_box = SDL_LoadBMP("green.bmp");
if ((player == NULL) || (red_box == NULL) || (green_box == NULL))
{
SDL_Quit();
exit(-1);
}
enemy01 = green_box;
x = 0;
y = 0;
src_player.x = 0;
src_player.y = 0;
src_player.w = player->w;
src_player.h = player->h;
dest_player.x = (screen->w / 2) - player->w;
dest_player.y = (screen->h / 2) - player->h;
dest_player.w = player->w;
dest_player.h = player->h;
src_enemy01.x = 0;
src_enemy01.y = 0;
src_enemy01.w = enemy01->w;
src_enemy01.h = enemy01->h;
dest_enemy01.x = WALK;
dest_enemy01.y = WALK;
dest_enemy01.w = enemy01->w;
dest_enemy01.h = enemy01->h;
walk_dir = RIGHT;
state_npc = PATROL;
}
void input() { SDL_Event e; while(SDL_PollEvent(&e)) { if (e.type == SDL_KEYDOWN) { switch(e.key.keysym.sym) { case SDLK_ESCAPE: quit = true; break; case SDLK_UP: y -= SPEED; break; case SDLK_DOWN: y += SPEED; break; case SDLK_LEFT: x -= SPEED; break; case SDLK_RIGHT: x += SPEED; break; } } else if (e.type == SDL_KEYUP) { switch(e.key.keysym.sym) { case SDLK_ESCAPE: quit = true; break; case SDLK_UP: y = 0; break; case SDLK_DOWN: y = 0; break; case SDLK_LEFT: x = 0; break; case SDLK_RIGHT: x = 0; break; } } }
if ((x != 0) && ((dest_player.x + x) > 0) && ((dest_player.x + x) < (screen->w - player->w)))
{
dest_player.x += x;
}
if ((y != 0) && ((dest_player.y + y) > 0) && ((dest_player.y + y) < (screen->h - player->h)))
{
dest_player.y += y;
}
}
void npc() { if (((dest_player.x - dest_enemy01.x) < DISTANCE) && ((dest_player.y - dest_enemy01.y) < DISTANCE)) { state_npc = PURSUIT; } else { state_npc = PATROL; }
//TODO: O movimento deve ser circular em qualquer lugar
if (state_npc == PATROL)
{
if (walk_dir == RIGHT)
{
if (dest_enemy01.x + SPEED_NPC > WALK)
{
walk_dir = DOWN;
}
else
{
dest_enemy01.x += SPEED_NPC;
}
}
else if (walk_dir == DOWN)
{
if (dest_enemy01.y + SPEED_NPC > WALK)
{
walk_dir = LEFT;
}
else
{
dest_enemy01.y += SPEED_NPC;
}
}
else if (walk_dir == LEFT)
{
if (dest_enemy01.x - SPEED_NPC <= 0)
{
walk_dir = UP;
}
else
{
dest_enemy01.x -= SPEED_NPC;
}
}
else if (walk_dir == UP)
{
if (dest_enemy01.y - SPEED_NPC <= 0)
{
walk_dir = RIGHT;
}
else
{
dest_enemy01.y -= SPEED_NPC;
}
}
}
else if (state_npc == PURSUIT)
{
if (dest_enemy01.x > (dest_player.x + 4))
{
dest_enemy01.x -= SPEED_NPC;
}
else if (dest_enemy01.x < (dest_player.x - 4))
{
dest_enemy01.x += SPEED_NPC;
}
if (dest_enemy01.y > (dest_player.y + 4))
{
dest_enemy01.y -= SPEED_NPC;
}
else if (dest_enemy01.y < (dest_player.y - 4))
{
dest_enemy01.y += SPEED_NPC;
}
}
}
void draw() { SDL_FillRect(screen, NULL, 0); SDL_BlitSurface(player, &src_player, screen, &dest_player); enemy01 = changeState(); SDL_BlitSurface(enemy01, &src_enemy01, screen, &dest_enemy01); }
void update() { SDL_Flip(screen); }
void close() { SDL_FreeSurface(screen); SDL_FreeSurface(player); SDL_FreeSurface(enemy01); SDL_Quit(); }
Uint32 wait(Uint32 t0) { Uint32 t1 = SDL_GetTicks();
if ((t1 - t0) < FRAME_RATE)
SDL_Delay(FRAME_RATE - (t1 - t0));
return t1;
}
SDL_Surface *changeState() { if (state_npc == PATROL) { return green_box; } else if (state_npc == PURSUIT) { return red_box; } else { return NULL; } }
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