no-reply@allegro.cc (V T) — Fri, 19 Sep 2014 23:12:36 +0000

Hello all,

I'm using a sprite sheet to hold my main players graphics. The last frame is the sprite for when the player is falling / in air. My code checks the direction of the player and flips the bitmap accordingly. However when flipping the frame for falling, the x location where the player is drawn gets flipped as well. Example, the frame on the sprite sheet starts at x = 102, and y = 0. When facing right (unflipped) the sprite draws at the correct location (the players x location). When facing left (the sprite is flipped) the sprite draws at the x location + 102. I feel like I have had this problem before and can't remember how it was fixed. I know I can just make a separate frame, and I will if I need to, but I'm curious what could be causing this. Anyone have any suggestions? My code is below:

#SelectExpand
   1
   2#define P_FALL_X      102
   3#define P_FALL_Y      0
   4#define P_FALL_W      133
   5#define P_FALL_H      32
   6
   7
   8void player::load_graphics(const char * file_name)
   9{
graphics = al_load_bitmap(file_name);
  11
al_convert_mask_to_alpha(graphics,al_map_rgb(255,0,255));
  13

g_standing = al_create_sub_bitmap(graphics,P_STAND_X,P_STAND_Y,P_STAND_W,P_STAND_H);
g_st = al_create_sub_bitmap(graphics,P_STAND_X,P_STAND_Y,P_STAND_W,P_STAND_H);
  17
g_falling = al_create_sub_bitmap(graphics,P_FALL_X,P_FALL_Y,P_FALL_W,P_FALL_H);

g_walking[0] = al_create_sub_bitmap(graphics,P_WALK1_X,P_WALK1_Y,P_WALK1_W,P_WALK1_H);
g_walking[1] = al_create_sub_bitmap(graphics,P_WALK2_X,P_WALK2_Y,P_WALK2_W,P_WALK2_H);
g_walking[2] = al_create_sub_bitmap(graphics,P_WALK3_X,P_WALK3_Y,P_WALK3_W,P_WALK3_H);
g_walking[3] = al_create_sub_bitmap(graphics,P_WALK4_X,P_WALK4_Y,P_WALK4_W,P_WALK4_H);
  24
curFrame = NULL;
  26}
  27
  28void player::draw_player()
  29{
int x_adjust = 0;
int y_adjust = 1;
  32
x_adjust = P_STAND_W - al_get_bitmap_width(curFrame);
  34
if (x_adjust < 0)
  x_adjust = 0;
  37
if(jumping)
  x_adjust = 0;
  40
if(d_y > 0)
{
  y_adjust += d_y;
}
  45
if(is_facing == LEFT)
{
  //al_draw_bitmap_region(graphics,d_x,d_y,d_w,d_h,(x + x_adjust),(y+y_adjust),ALLEGRO_FLIP_HORIZONTAL);
  al_draw_bitmap(curFrame,(x + x_adjust),(y + y_adjust),ALLEGRO_FLIP_HORIZONTAL);
  
}
else if(is_facing == RIGHT)
{
  //al_draw_bitmap_region(graphics,d_x,d_y,d_w,d_h,(x + x_adjust),(y+y_adjust),0);
  al_draw_bitmap(curFrame,(x + x_adjust),(y + y_adjust),0);
}
  57}
  58
  59void player::set_curFrame()
  60{
if(velx == 0)
{
  curFrame = g_st;
  frame = 0;
}
else
{
  frame++;
  if(frame >= 1)
  {
    if(frame < 5)
    {
      curFrame = g_walking[0];
    }
    else if(frame < 10)
    {
      curFrame = g_walking[1];
    }
    else if(frame < 15)
    {
      curFrame = g_walking[2];
    }
    else if(frame < 20)
    {
      curFrame = g_walking[3];
    }
    else if (frame < 25)
    {
      frame = 5;
    }
  }
}
if(jumping || lockjump || is_falling)
{
  curFrame = g_falling;
}
  97}

Also, I tried removing the parts in the draw function where x_adjust is set, changing it so x_adjust is always = 0, and this didn't change anything. Any suggestions or ideas would be welcome.

no-reply@allegro.cc (beoran) — Mon, 22 Sep 2014 09:09:24 +0000

I assume something is wrong with the x coordinate of player? Perhaps debgugging o a few printfs could clarify this.

no-reply@allegro.cc (Arthur Kalliokoski) — Mon, 22 Sep 2014 11:03:26 +0000

I didn't look very closely at it, but it seems to me that line 33 should be:

x_adjust = P_STAND_W - al_get_bitmap_width(curFrame)/2;

no-reply@allegro.cc (Edgar Reynaldo) — Mon, 22 Sep 2014 19:47:57 +0000

Shouldn't they both be divided by 2? To center the player?

Problem with ALLEGRO_FLIP_HORIZONTAL and spritesheet