ClassicEngine.cpp

00001 #include "ClassicEngine.h"
00002 
00003 //constructor
00004 ClassicEngine::ClassicEngine(){
00005 }
00006 
00007 //destructor
00008 ClassicEngine::~ClassicEngine(){
00009 }
00010 
00011 //initialiser
00012 void ClassicEngine::init(Ball &ball, Map &map){
00013     _frames = 0;            //set frames counted to 0
00014     _ball_coord.x = 42;     //set ball to middle of screen
00015     _ball_coord.y = 24;
00016     _map_coord.x = 47;      //set map to the start area
00017     _map_coord.y = 25;
00018     ball.set_position(_ball_coord);
00019     map.set_map_display(_map_coord);
00020 }
00021 
00022 void ClassicEngine::classic_update(Ball &ball, FXOS8700CQ &accelerometer, Map &map){
00023     map.read_input(accelerometer, ball);
00024     map.update();                       //get map input from accelerometer and update region to display
00025     ball.set_position(_ball_coord);     //keep ball fixed to middle
00026     _frames++;                          //increment frames count for timer
00027     _map_coord = map.get_map_display();
00028     _abs_ball_pos.x = _ball_coord.x + _map_coord.x;     //update the ball's position in relation to the map
00029     _abs_ball_pos.y = _ball_coord.y + _map_coord.y;     //(even though it's fixed on the screen)
00030 }
00031 
00032 void ClassicEngine::classic_draw(N5110 &lcd, Map &map, Ball &ball){
00033     map.draw(lcd);      //draw map
00034     ball.draw(lcd);     //draw ball
00035 }
00036 
00037 bool ClassicEngine::finished(){
00038     bool finished = false;
00039     if(_abs_ball_pos.x > 402   &&       //these are the range of coords the ball
00040        _abs_ball_pos.x < 403   &&       //can have as it crosses the finish line
00041        _abs_ball_pos.y > 101   &&       //must be given as a range rather than an
00042        _abs_ball_pos.y < 141   ){       //exact number as .x and .y are floats so 
00043            finished = true;             //will never exactly equal 402
00044     }
00045     else{ finished = false; }
00046     return finished;        //tell the game mode that the ball's reached the end of the course
00047 }
00048 
00049 void ClassicEngine::mode_complete(N5110 &lcd, Gamepad &gamepad, int fps){
00050     float time_taken;
00051     while(!(gamepad.check_event(gamepad.A_PRESSED))){       //check for user advancing
00052         time_taken = _frames / fps;     //calculate time taken from no. of frames that passed
00053         char buffer[6];
00054         sprintf(buffer, "%4.f", time_taken);        //write the time taken into a buffer
00055         lcd.clear();
00056         lcd.printString("You win!", 18, 1);         //win message
00057         lcd.printString("Your time:", 12, 3);
00058         lcd.printString(buffer, 18,4);              //print the time taken
00059         lcd.printChar('s',54,4);
00060         lcd.printString("(A = back)", 24, 5);
00061         lcd.refresh();
00062         wait(0.2);          //slower frame rate to reduce button bounce effects
00063     }
00064     write_high_scores(time_taken);      //check if high score, and update leaderboard if so
00065 }
00066 
00067 bool ClassicEngine::mode_failed(N5110 &lcd, Gamepad &gamepad, Ball &ball, Map &map){
00068     bool back_to_start_menu = false;        //bool to store whether restarting or going to main menu
00069     while(1){
00070               wait(0.2);
00071               lcd.clear();
00072               lcd.printString("Game over!", 12, 1);         //display potential options
00073               lcd.printString("Back = A", 18, 3);
00074               lcd.printString("Replay = B", 12, 4);
00075               lcd.refresh();
00076         if(gamepad.check_event(gamepad.A_PRESSED)){
00077             back_to_start_menu = true;          //return to start menu
00078             break; }                                    //use of break commands as while(!(a pressed || b pressed)) was buggy in run time
00079         if(gamepad.check_event(gamepad.B_PRESSED)){
00080             back_to_start_menu = false;         //restart
00081             break; }
00082     }
00083     return back_to_start_menu;
00084 }
00085 
00086 void ClassicEngine::read_high_scores(){
00087     FILE *fp;                                           //open file stream
00088     fp = fopen("/sd/classichighscores.txt", "r");       //open classic high scores file in read mode
00089     
00090     if(fp == NULL){
00091         printf("Error: Could not open file");           //check open
00092     } else {
00093         int i = 0;
00094         rewind(fp);         //go back to start of file
00095         
00096         while(fscanf(fp, "%d,%f", &_index_array[i], &_array_of_values[i]) != EOF){      //read into index and value arrays until end of file
00097             i++;        //increment which array row to read into
00098         }
00099         fclose(fp);     //close file stream
00100     }
00101 }
00102 
00103 void ClassicEngine::check_high_score(int time_taken){
00104     read_high_scores();
00105     for(int i = 4; i >= 0; i--){                        //algorithm to reorder high scores if new
00106         if(_array_of_values[i] > time_taken){           //high score achieve or discard if not
00107             _array_of_values[i+1] = _array_of_values[i];
00108             _array_of_values[i] = time_taken;           //note: must seed high scores with ascending numbers when file made for first time
00109         }
00110     }
00111 }
00112 
00113 void ClassicEngine::write_high_scores(int time_taken){
00114     check_high_score(time_taken);
00115     FILE *fp;                                       //open file stream
00116     fp = fopen("/sd/classichighscores.txt", "w");   //open classic high score file in write mode
00117     if(fp == NULL){
00118         printf("Error: Could not open file");       //check open
00119     } else {
00120         for(int i = 0; i < 5; i++){
00121             fprintf(fp, "%d, %f\n", _index_array[i], _array_of_values[i]);  //write 5 highest values of high score array into file
00122         }
00123         fclose(fp);     //close file stream
00124     }
00125 }