File content as of revision 15:90b6821bcf64:

#include "Map.h"

#define MAP_TERRAIN_Y_POSITION 42
#define MAP_TERRAIN_X_POSITION -84
#define MAP_TERRAIN_X_LENGTH 0

Map::Map() {
    
}
 
Map::~Map() {
    
}

void Map::init(Gamepad &pad) {
    map_length_ = MAP_TERRAIN_X_LENGTH;
    position_x_map_ = MAP_TERRAIN_X_POSITION;
    position_y_map_ = MAP_TERRAIN_Y_POSITION;
    
    // Initialises random arrays to make random map
    fill_random_arrays(pad);
}

void Map::fill_random_arrays(Gamepad &pad){
    srand(pad.read_adc()*64000);
    for(int i = 0; i < 11; i++){
        rand_heights_[i]= rand() % 8 + 5;
        rand_lengths_[i]= rand() % 16 + 15;
    }   
    
    //To to check random numbers generated are actaully random 
    #ifdef RANDOM_NUMBER_DEBUG   
    for (int i = 0; i < 11; i++){ 
       printf("map height random array = %d\n", rand_heights_[i]);
    }
    #endif
}

void Map::draw_triangle(N5110 &lcd,int triangle_height){ 
    // draws triangle by drawing two lines with one line having negative gadient 
    lcd.drawLine(position_x_map_, position_y_map_, position_x_map_ + triangle_height, position_y_map_ - triangle_height,1); 
    lcd.drawLine(position_x_map_ + triangle_height, position_y_map_ - triangle_height,position_x_map_ + 2*triangle_height,position_y_map_,1);
    
    // changes the position of the map next draw line starts at the end of the drawn triangle
    position_x_map_ = position_x_map_ + 2*triangle_height,position_y_map_;
}

void Map::draw_line(N5110 &lcd,int line_length){ 
    lcd.drawLine(position_x_map_, position_y_map_, position_x_map_ + line_length, position_y_map_,1);
    
    // changes the position of the map next draw triangle starts at the end of the drawn line
    position_x_map_ += line_length;
}

void Map::draw_map(N5110 &lcd, int move_map){
    //usb.printf("position_x_map_ = %d\n", position_x_map_);
    //usb.printf("move map = %d\n", move_map);

    reset_position_x_map_to_origonal_ = position_x_map_;
    int map_length_ = 0;
    
    //prints main part of map
    for(int i = 0; i < 11; i++){
        draw_triangle(lcd,rand_heights_[i]);
        draw_line(lcd,rand_lengths_[i]);
        final_random_element_used_ = i;
        
        // calculates the length of the random map produced
        map_length_ += rand_lengths_[i] + 2*rand_heights_[i];
        
        // stops random maps lengths being to large only want it about 3 screen widths
        if (map_length_ >252){ 
            break;
        }
    }
    
    //checks is map need duplicating on forward and backwards loop and fills gap 
    check_duplicates_map_forward(lcd);
    check_duplicates_map_backwards(lcd);
    
    // Resets postion of map and moves it 
    position_x_map_ = reset_position_x_map_to_origonal_ + move_map;
    
    // Moves map to different persition so make it look like its looping 
    if(position_x_map_+ map_length_ < 0){
       position_x_map_ = 0;
    } else if(position_x_map_ > 84){
        position_x_map_ = 84 - map_length_;
    }
}

void Map::check_duplicates_map_forward(N5110 &lcd){ 
    // Prints 1st part of map to fill gap wear map isn't present just befor its about to loop round it's self
    if(reset_position_x_map_to_origonal_ + map_length_ <84 ){
        for(int i = 0; i < 4; i++){
            draw_triangle(lcd,rand_heights_[i]);
            draw_line(lcd,rand_lengths_[i]);
        }
    }
    
}

void Map::check_duplicates_map_backwards(N5110 &lcd){
    // Prints last part of map to fill gap wear map isn't present just befor its about to loop round it's self
    if(reset_position_x_map_to_origonal_ > 0 ){
        int print_reverse_position = 0;
        
        // prints the last 4 parts of map to fill gap
        for(int i = final_random_element_used_ ; i > final_random_element_used_ - 4; i--){
            position_x_map_ = reset_position_x_map_to_origonal_ - rand_lengths_[i] - print_reverse_position;
            draw_line(lcd,rand_lengths_[i]);
            print_reverse_position += rand_lengths_[i];
            position_x_map_ = reset_position_x_map_to_origonal_ - 2*rand_heights_[i] - print_reverse_position;
            draw_triangle(lcd,rand_heights_[i]);
            print_reverse_position += 2*rand_heights_[i];
        }
    }
}

int Map::get_position_x_map(){
    return position_x_map_;
}