void AppBody()
{
bool done = false;
bool redraw = false;
TileMap map("data/maps/test1.tmx");
Sprite sprt("data/sprites/demo.adf");
sprt.SendNewState(AnimState::IDLE, AnimDir::DOWN);
ALLEGRO_TRANSFORM camera;
int x_offset = 0, y_offset = 0;
int x_delta, y_delta;
int key_state[2] = {0, 0};
x_delta = applicationConfig.iDispW - al_get_bitmap_width(map.GetFullMap());
y_delta = applicationConfig.iDispH - al_get_bitmap_height(map.GetFullMap());
Vec2D playerPos {0, 0};
Vec2D playerVel {0, 0};
al_start_timer(timer);
while (!done)
{
ALLEGRO_EVENT ev;
al_wait_for_event(queue, &ev);
switch (ev.type)
{
case ALLEGRO_EVENT_TIMER:
al_identity_transform(&camera);
x_offset += key_state[0];
y_offset += key_state[1];
if (x_delta > 0)
{
x_offset = x_delta / 2;
} else
{
if (x_offset < x_delta) x_offset = x_delta;
if (x_offset > 0) x_offset = 0;
}
if (y_delta > 0)
{
y_offset = y_delta / 2;
} else
{
if (y_offset < y_delta) y_offset = y_delta;
if (y_offset > 0) y_offset = 0;
}
if (map.CanWalktoTileAt(playerPos, sprt.GetSize(), {0.0f, 32.0f}) == true)
{
playerPos = playerPos + playerVel;
} else
{
Vec2D backtracing = playerVel;
playerVel = {0, 0}; // we delete player velocitity to stop oscillating in place during collision.
if (backtracing == playerVel) // If for whatever reason we are stuck and cannot determine orig vector... MAGIC!
{
backtracing.x = 2.0f;
backtracing.y = 2.0f;
float angle = rand() % 359 + 1;
backtracing.rotate(angle * (ALLEGRO_PI / 180));
std::cerr << "Warning: Unknown velocity vector. Will use [" << backtracing.x << "," << backtracing.y
<< "] as direction to solve collision." << std::endl;
}
while (map.CanWalktoTileAt(playerPos, sprt.GetSize(), {0.0f, 32.0f}) == false)
{
playerPos = playerPos - backtracing;
}
}
sprt.Update();
redraw = true;
break;
case ALLEGRO_EVENT_DISPLAY_CLOSE:
done = true;
break;
case ALLEGRO_EVENT_KEY_DOWN:
if (ev.keyboard.keycode == ALLEGRO_KEY_ESCAPE)
{
done = true;
}
switch (ev.keyboard.keycode)
{
case ALLEGRO_KEY_LEFT: key_state[0] = 4; break;
case ALLEGRO_KEY_RIGHT: key_state[0] = -4; break;
case ALLEGRO_KEY_UP: key_state[1] = 4; break;
case ALLEGRO_KEY_DOWN: key_state[1] = -4; break;
case ALLEGRO_KEY_A:
playerVel.x = -2;
sprt.SendNewState(AnimState::MOVE, AnimDir::LEFT);
break;
case ALLEGRO_KEY_D:
playerVel.x = 2;
sprt.SendNewState(AnimState::MOVE, AnimDir::RIGHT);
break;
case ALLEGRO_KEY_W:
playerVel.y = -2;
sprt.SendNewState(AnimState::MOVE, AnimDir::UP);
break;
case ALLEGRO_KEY_S:
playerVel.y = 2;
sprt.SendNewState(AnimState::MOVE, AnimDir::DOWN);
break;
}
break;
case ALLEGRO_EVENT_KEY_UP:
switch (ev.keyboard.keycode)
{
case ALLEGRO_KEY_LEFT:
case ALLEGRO_KEY_RIGHT: key_state[0] = 0; break;
case ALLEGRO_KEY_UP:
case ALLEGRO_KEY_DOWN: key_state[1] = 0; break;
case ALLEGRO_KEY_A:
playerVel.x = 0;
sprt.SendNewState(AnimState::IDLE, AnimDir::LEFT);
break;
case ALLEGRO_KEY_D:
playerVel.x = 0;
sprt.SendNewState(AnimState::IDLE, AnimDir::RIGHT);
break;
case ALLEGRO_KEY_W:
playerVel.y = 0;
sprt.SendNewState(AnimState::IDLE, AnimDir::UP);
break;
case ALLEGRO_KEY_S:
playerVel.y = 0;
sprt.SendNewState(AnimState::IDLE, AnimDir::DOWN);
break;
}
break;
default:
break;
}
if (redraw && al_is_event_queue_empty(queue))
{
al_translate_transform(&camera, x_offset, y_offset);
al_use_transform(&camera);
redraw = false;
al_clear_to_color(styleConfig.colBackgroundColor);
map.DrawLayerMap("Background");
map.DrawLayerMap("Foreground");
/*
Playable characters should draw on this position
*/
sprt.Render(playerPos.x, playerPos.y);
map.DrawLayerMap("Top");
al_flip_display();
}
}
}
