16x16px/enemy.cpp at master · eBrnd/16x16px · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
#include "enemy.hpp"

Enemy::Enemy(SDL_Surface* display, Foreground* foreground)
{
  this->display = display;
  this->foreground = foreground;
  this->sprite = NULL;
  px = 0;
  py = 0;
  vy = 0;
  vx = 16;
  width = height = 0;
  animation_time = 0;
  death_animation = 0;
}

Enemy::~Enemy()
{
  if(sprite != NULL)
    SDL_FreeSurface(sprite);
}

bool Enemy::loadSprite(std::string filename, int width, int height)
{
  this->width = width;
  this->height = height;
  if(sprite != NULL)
    SDL_FreeSurface(sprite);
  if((sprite = IMG_Load(filename.c_str())) != NULL)
    return true;
  else
    return false;
}

void Enemy::setMapPosition(int x, int y)
{
  px = x * 256;
  py = y * 256;
}

int Enemy::update()
{
  if(!death_animation)
  {
    // gravity
    vy = vy >= 64 ? 64 : vy + 16;
    while(foreground->collision(px/16, (py+vy)/16, width, height))
    {
      if(vy > 0)
      {
        vy--;
      } else {
        vy = 8;
      }
    }
    py += vy;

    // horizontal movement
    if(foreground->collision((px+vx)/16, py/16, width, height))
      vx = -vx;
    px += vx;
  } else {
    if(death_animation-- == 1)
      return -1;
    else
      return 1;
  }
  return 0;
}

void Enemy::draw(int x, int y)
{
  if(animation_time++ > 15)
    animation_time = 0;
  SDL_Rect src = { death_animation ? 64 : (animation_time > 7 ? 16 : 0) + (vx > 0 ? 32 : 0), 0, 16, 16 };
  SDL_Rect dst = { px/16 - x, py/16 - y, 16, 16 };
  SDL_BlitSurface(sprite, &src, display, &dst);
}

void Enemy::hit()
{
  death_animation = 32;
}

Box Enemy::getBbox()
{
  return Box(px / 16, px / 16 + width, py / 16, py / 16 + height);
}