My code uses a class that I made called SPRITE. Now SPRITE contains an array of BITMAP*s, the problem is that the first time I come to try and blit one of those BITMAP*s the whole programme crashes.
Now it didn't used to do this, so I don't know why it is doing it now.
This is the header and constructor for the SPRITE class:
| 1 | class SPRITE { |
| 2 | public: |
| 3 | int offset_x; //Draw offset x |
| 4 | int offset_y; //Draw offset y |
| 5 | int max_frames; //Frames in sprite (array bounds 0 - max_frames) |
| 6 | int width; //Sprite width (all frames) |
| 7 | int height; //Sprite height (all frames) |
| 8 | int id; //Individual sprite ID |
| 9 | bool operator == (SPRITE &class1); //Comparison (checks IDs) |
| 10 | BITMAP * spr_sheet(); //Returns a BITMAP of the entire sprite sheet, horizontally. |
| 11 | BITMAP ** frames; //The pointer to the array of BITMAP*s, the main point of this |
| 12 | SPRITE(BITMAP * load_sprite, int load_width, int load_height, int frame_num, int load_offset_x = 0, int load_offset_y = 0, int offset_x = 0, int offset_y = 0, bool debug_me = 0); //The constructor, self explanitory |
| 13 | SPRITE(); //Empty Constructor |
| 14 | ~SPRITE(); //Destructor |
| 15 | void draw(int x, int y, int frame, int alpha = 255, bool debug_me = 0); //Normal draw function |
| 16 | |
| 17 | }; |
| 1 | SPRITE::SPRITE(BITMAP* load_sprite, int load_width, int load_height, int frame_num, int load_offset_x, int load_offset_y, int draw_offset_x, int draw_offset_y, bool debug_me ) { |
| 2 | if (load_sprite != NULL){ |
| 3 | id = spr::get_safe_id(); |
| 4 | |
| 5 | frames = new BITMAP* [frame_num]; |
| 6 | width = (int)(std::abs((float)(load_width))); |
| 7 | height = load_height; |
| 8 | max_frames = frame_num; |
| 9 | offset_x = draw_offset_x; |
| 10 | offset_y = draw_offset_y; |
| 11 | for (int a = 0; a < frame_num; a++){ |
| 12 | frames[a] = create_bitmap(width, height); |
| 13 | blit(load_sprite, frames[a], load_offset_x + a*width, load_offset_y, 0, 0, width, height); |
| 14 | } |
| 15 | destroy_bitmap(load_sprite); |
| 16 | } |
| 17 | else allegro_message("Error loading a certain sprite"); |
| 18 | } |
This is the init() function, which is the first one called within main():
| 1 | |
| 2 | void init() { |
| 3 | int depth, res; |
| 4 | allegro_init(); |
| 5 | depth = desktop_color_depth(); |
| 6 | if (depth == 0) depth = 32; |
| 7 | set_color_depth(depth); |
| 8 | res = set_gfx_mode(GFX_AUTODETECT_WINDOWED, 480, 320, 0, 0); |
| 9 | if (res != 0) { |
| 10 | allegro_message(allegro_error); |
| 11 | exit(-1); |
| 12 | } |
| 13 | |
| 14 | install_timer(); |
| 15 | install_keyboard(); |
| 16 | install_mouse(); |
| 17 | load_bitmaps(); |
| 18 | install_sound( DIGI_AUTODETECT, MIDI_AUTODETECT, NULL); |
| 19 | load_sounds(); |
| 20 | /* add other initializations here */ |
| 21 | set_close_button_callback(End); |
| 22 | |
| 23 | link = OBJ_LINK(); //Construct link |
| 24 | helmaroc = OBJ_HELMAROC(); //Construct the helmaroc |
| 25 | heart_system = OBJ_HEARTS(8, 8); //Construct the heart system |
| 26 | SoundMeter = soundMeter(); //Construct the sound meter |
| 27 | rupees = rupeeSystem(8, 142); //construct the rupee system |
| 28 | rmtower = clROOM(tower); //create the tower room |
| 29 | } |
Now I cannot see any way that a BITMAP* could go astray and create a pointer error, unless it happens in one of those constructors (which I don't think it does, but if you want to see them you can).
The problem comes later when this code is run:
link.spr_link_right_walk.draw(105 + 0, 40, 0, 255, 1);
This calls the draw function in the SPRITE class, which simply draws a translucent copy of that frame.
I don't know what could be going wrong, so could someone please help me? I've been stuck on this bug for a while, and it completely stops the programme 
.