game_map.cpp

#include<stdio.h>
#include "game_map.h"

void GameMap::LoadMap(char* name)
{
    FILE* fp = fopen(name, "rb");
    if(!fp)
    {
        return ;
    }

    game_map_.max_x_ = 0;
    game_map_.max_y_ = 0;

    for(int i=0;i < MAX_MAP_Y;i++)
    {
        for(int j =0; j<MAX_MAP_X;j++)
        {
            fscanf(fp,"%d", &game_map_.tile[i][j]);
            int val = game_map_.tile[i][j];
            if(val > 0)
            {
                if(j > game_map_.max_x_)
                {
                    game_map_.max_x_ = j;
                }

                if(i > game_map_.max_y_)
                {
                    game_map_.max_y_ = i;
                }
            }
        }
    }

    game_map_.max_x_ = (game_map_.max_x_ + 1)*TILE_SIZE;
    game_map_.max_y_ = (game_map_.max_y_ + 1)*TILE_SIZE;

    game_map_.start_x_ = 0;
    game_map_.start_y_ = 0;

    game_map_.file_name_ = name;
    fclose(fp);
}

void GameMap::LoadTiles(SDL_Renderer*screen)
{
    char file_img[30];
    for(int i=0;i < MAX_TILES;i++)
    {
        sprintf(file_img,"map/%d.png",i);

     FILE *fp = fopen(file_img,"rb");
        if(fp == NULL)
            continue;
        fclose(fp);

        tile_mat[i].LoadImg(file_img,screen);
    }
}

void GameMap::DrawMap(SDL_Renderer*screen)
{
    int x1 = 0;
    int x2 = 0;
    int y1 = 0;
    int y2 = 0;
    int map_x = 0;
    int map_y = 0;

    map_x = game_map_.start_x_/TILE_SIZE;
    x1 = (game_map_.start_x_%TILE_SIZE)*-1;
    x2 = x1 + SCREEN_WIDTH +(x1==0 ? 0 : TILE_SIZE);

    map_y = game_map_.start_y_/TILE_SIZE;
    y1 = (game_map_.start_y_%TILE_SIZE)*-1;
    y2 = y1 + SCREEN_HEIGHT +(y1==0 ? 0 : TILE_SIZE);

    for(int i= y1;i<y2;i+= TILE_SIZE)
    {
        map_x = game_map_.start_x_/TILE_SIZE;
        for(int j=x1;j<x2;j += TILE_SIZE)
        {
            int val = game_map_.tile[map_y][map_x];
            if (val > 0)
            {
                tile_mat[val].SetRect(j,i);
                tile_mat[val].Render(screen);
            }
            map_x++;
        }
        map_y++;
    }
}