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POMy program displays empty surface, where it needs to display a map
 

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  1. POMy program displays empty surface, where it needs to display a map
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    <p>I have a problem with SDL. As you see, I have 3 files: include.h, map.h, source.cpp.</p> <p>In include.h I included all libraries. In map.h I wrote a class: getTileID reads a picture and slices it to tiles, getTilePosition reads .txt file, drawMap function makes a surface assigning sliced surface tiles to id values from text file.</p> <p>Then, in source.cpp I initiliaze SDL, SetVideoMode, and create a class A. After that, I call class A functions. After calling it, I A.mapSurface[0] variable to screen and flip it. </p> <p>Nothing happens. Screen loads, and, as I think it flips with empty surface, but it needs to display mapSurface variable.</p> <p>Please help.</p> <pre><code>//include.h //---------------------------------------------------------------------------------------------------- #include "headers\SDL.h" #include "headers\SDL_image.h" //---------------------------------------------------------------------------------------------------- #pragma comment(lib, "SDL.lib") #pragma comment(lib, "SDLmain.lib") #pragma comment(lib, "SDL_image.lib") //---------------------------------------------------------------------------------------------------- #include &lt;string&gt; #include &lt;fstream&gt; //---------------------------------------------------------------------------------------------------- #include "map.h" </code></pre> <p>-</p> <pre><code>//map.h //---------------------------------------------------------------------------------------------------- #pragma once //#include "include.h" //---------------------------------------------------------------------------------------------------- class map { public: //---------------------------------------------------------------------------------------------------- map(void); ~map(void); void getTileID(const char* mapFile); void getTilePosition(std::string mapFile); void drawMap(); //---------------------------------------------------------------------------------------------------- static const short int TILEMAP_WIDTH = 24; static const short int TILEMAP_HEIGHT = 24; static const short int TILE_WIDTH = 32; static const short int TILE_HEIGHT = 32; SDL_Surface* tileID[1025]; short int mapWidth; short int mapHeight; short int mapID[2][500][500]; short int graphicLayer; SDL_Surface* mapSurface[5]; }; //---------------------------------------------------------------------------------------------------- map::map(void) { } map::~map(void) { } //---------------------------------------------------------------------------------------------------- void map::getTileID(const char* mapFile) { IMG_Init(IMG_INIT_PNG); SDL_Surface *tileMap; tileMap = IMG_Load(mapFile); if(tileMap == NULL) { exit(1); } for(short int i = 0; i &lt; map::TILEMAP_WIDTH * map::TILEMAP_HEIGHT + 1; i++) { map::tileID[i] = (SDL_CreateRGBSurface(SDL_HWSURFACE | SDL_SRCALPHA, map::TILE_WIDTH, map::TILE_HEIGHT, 32, 0, 0, 0, 0)); if(map::tileID[i] == NULL) { exit(2); } } tileID[0] = NULL; short int id = 1; for(short int c = 0; c &lt; map::TILEMAP_WIDTH; c++) { for(short int r = 0; r &lt; map::TILEMAP_HEIGHT; r++) { short int sliceX = c * map::TILE_WIDTH; short int sliceY = r * map::TILE_HEIGHT; SDL_Rect srcRect; srcRect.x = sliceX; srcRect.y = sliceY; srcRect.w = map::TILE_WIDTH; srcRect.h = map::TILE_HEIGHT; SDL_Rect dstRect; dstRect.x = 0; dstRect.y = 0; dstRect.h = 32; dstRect.w = 32; if(SDL_BlitSurface(tileMap, &amp;srcRect, map::tileID[id], &amp;dstRect) != NULL) exit(3); id++; } } SDL_FreeSurface(tileMap); IMG_Quit(); } //---------------------------------------------------------------------------------------------------- void map::getTilePosition(std::string mapFile) { std::string tag, objType[10]; short int l = 0; float objX[10], objY[10], objWidth[10], objHeight[10]; std::ifstream data(mapFile); while(!data.eof()) { getline(data, tag); if(tag == "[header]") { data.ignore(256, '='); data &gt;&gt; map::mapWidth; data.ignore(256, '='); data &gt;&gt; map::mapHeight; data.ignore(256, '\n'); } map::graphicLayer = 0; if(tag == "[layer]") { data.ignore(256, '\n'); data.ignore(256, '\n'); for(short int c = 0; c &lt; map::mapHeight; c++) { for(short int r = 0; r &lt; map::mapWidth; r++) { data &gt;&gt; map::mapID[map::graphicLayer][c][r]; } } map::graphicLayer++; data.ignore(256, '\n'); } if(tag.substr(0, 7) == "[object") { objType[l] = tag.substr(8, tag.size() - 9); data.ignore(256, '\n'); data.ignore(256, '\n'); data.ignore(256, '='); data &gt;&gt; objX[l] &gt;&gt; objY[l] &gt;&gt; objWidth[l] &gt;&gt; objHeight[l]; l++; data.ignore(256, '\n'); } } data.close(); } //---------------------------------------------------------------------------------------------------- void map::drawMap() { map::mapSurface[0] = (SDL_CreateRGBSurface(SDL_HWSURFACE | SDL_SRCALPHA, 3200 ,3200 , 32, 255, 255, 255, 0)); for(short int gl = 0; gl &lt; map::graphicLayer; gl++) { for(short int c = 0; c &lt; map::mapWidth; c++) { for(short int r = 0; r &lt; map::mapHeight; r++) { for(short int id = 0; id &lt; map::TILEMAP_WIDTH * map::TILEMAP_HEIGHT; id++) { if(map::mapID[gl][c][r] == id) { SDL_Rect dstRect; dstRect.x = c * map::TILE_WIDTH; dstRect.y = r * map::TILE_HEIGHT; if(SDL_BlitSurface(map::tileID[id], NULL, map::mapSurface[gl], &amp;dstRect) != NULL) exit(4); } } } } } } </code></pre> <p>-</p> <pre><code>//source.cpp //---------------------------------------------------------------------------------------------------- #include "../libraries/include.h" //---------------------------------------------------------------------------------------------------- int main(int argc,char *argv[]) { if(SDL_Init(SDL_INIT_EVERYTHING) != NULL) exit(0); SDL_Surface *screen; screen = SDL_SetVideoMode(1024, 768, 32, SDL_HWSURFACE | SDL_DOUBLEBUF); map A; A.getTileID("map.png"); A.getTilePosition("map.txt"); A.drawMap(); screen = A.mapSurface[0]; SDL_Flip(screen); SDL_Delay(1000); SDL_FreeSurface(screen); SDL_Quit(); return 0; } </code></pre>
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      1. POMy program displays empty surface, where it needs to display a map
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    1. COyou dont need a loop or something?
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      1. POMy program displays empty surface, where it needs to display a map
      1. USrkmax
    2. COI just need to know, what I did wrong, becouse it displays me an emty surface...
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      1. USRokas
    3. COthe methods `IMG_Init(IMG_INIT_PNG)` and `IMG_Quit()` i thinks you should call it in the `Map::Map()` and `Map::~Map` respectively
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      1. POMy program displays empty surface, where it needs to display a map
      1. USrkmax
 

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