ELEC2645 (2019/20)
Owen Cavender 201159294
Diff: snake.cpp
- Revision:
- 14:7fb3c93343b6
- Parent:
- 13:b37dde18bfdc
- Child:
- 16:9500059ad5d8
--- a/snake.cpp Fri May 29 16:27:29 2020 +0000
+++ b/snake.cpp Sat May 30 02:31:43 2020 +0000
@@ -11,9 +11,9 @@
-void Snake::init()
+void Snake::init()//int x, int y)
{
- _x0 = 48;
+ _x0 = 48; //initialises the snake and apple position
_x1 = 48;
_x2 = 48;
_x3 = 48;
@@ -26,14 +26,15 @@
_y3 = 17;
_y4 = 16;
_y5 = 15;
-
- _apx = 48;
+
+ _apx = 48; //initial apple position - directly in front of snake
_apy = 25;
- _gameover = false;
+ _gameover = false; //when _gameover = true, game cannot be played
_reset_apple = false;
_score = 0;
_direction = up;
- _countdown = 30;
+ _countdown = 12; //initial number of moves is lower than the reset value in order to keep the number of moves low to increase difficulty
+
// Vector2D *_snakebody = new Vector2D [_length];
}
@@ -55,89 +56,95 @@
{
//need to code clear apple and make sure apple isnt spawning every time
- if((_x0 == _apx) && (_y0 == _apy)) {
+ if((_x0 == _apx) && (_y0 == _apy)) { // directly comparing position of the apple and the Snakehead - if they are the same: the score increases, countdown timer is reset, a new apple position is generated, LEDS and Speaker are triggered
// _countdown = _reset_value;
_score++;
- _reset_apple = true;
- _countdown = 30; //causes new apple position to be generated
- pad.tone(1500.0,0.5);
- pad.led(2, 1);
+ _reset_apple = true; //causes new apple position to be generated - _reset _apple is compared to a bool true - when an apple is collected a new apple position is generated
+ _countdown = _countdown + 38; //38 is added to the current countdown timer - this larger _countdown is, the further the snake can travel to collect apples.
+ pad.tone(1500.0,0.5); //if the counter is reset to just 38, there will be some distances the snake cannot as it is further than 38 pixels away - unless the player collects accumulates their available moves
+ pad.led(2, 1); //
pad.led(4, 1);
-
- //pad.led(2, 0);
- //pad.led(4, 0);
+ wait(0.1);
+ pad.led(2, 0);
+ pad.led(4, 0);
} else {
- _countdown = _countdown - 1;
- printf(" countdown = %d score %d ", _countdown ,_score);
+ _countdown = _countdown - 1; //for each change in position, counter decreases by 1
}
}
int Snake::get_countdown()
{
+ //allows _countdown value to be called from other classes
return _countdown;
}
-void Snake::check_gameover(N5110 &lcd) //code where it hits itself
+void Snake::check_gameover(N5110 &lcd)
{
- if (_x0 == 0 ||_x0 == 84 || _y0 == 32 || _y0 == 0) { //how do i access snakehead.headx
-
- _gameover = true;
- }
- if ((_x0 == _x1 && _y0 == _y1) || (_x0 == _x2 && _y0 == _x2) || (_x0 == _x2 && _y0 == _y2) || (_x0 == _x3 && _y0 == _y3) || (_x0 == _x4 && _y0 == _y4)|| (_x0 == _x5 && _y0 == _y5)) {
- _gameover = true;
- }
- if(_countdown == 0) {
- _gameover = true; //|| (_x0 == _x4 && _y0 == _y4))
-
- }
+ if (_x0 == 15 ||_x0 == 69 || _y0 == 32 || _y0 == 0) { // the snakehead coordinate is on any edge of the rectangle, it is gameover
+ //the second condition is the game is over if the snake head cooroinate is equal to one of the snake body bits coordinate
+ _gameover = true; // the third conditios is game is over if the counter = 0, indicating you've ran out of moves.
}
-
-void Snake::gameover_true(N5110 &lcd)
-{
+ if ((_x0 == _x1 && _y0 == _y1) || (_x0 == _x2 && _y0 == _x2) || (_x0 == _x2 && _y0 == _y2) || (_x0 == _x3 && _y0 == _y3) || (_x0 == _x4 && _y0 == _y4)|| (_x0 == _x5 && _y0 == _y5)|| (_x0 == _x6 && _y0 == _y6)|| (_x0 == _x7 && _y0 == _y7)) {
+ _gameover = true;
+ }
+ if(_countdown == 0) {
+ _gameover = true;
- while (_gameover == true) {
-
- lcd.printString( " Game Over L ", 0, 2 );
- char buffer1[14];
- sprintf(buffer1,"%2d",_score);
- lcd.printString(buffer1,0 ,48); // font is 8 wide, so leave 4 pixel gape from middle assuming two digits
-
-
- if (_score <= 7) {
- lcd.printString(" Loser ", 0,10);
- }
- if (7< _score <= 25) {
- lcd.printString(" Good Job! ", 0,10);
- } else {
- lcd.printString(" SNAKE PRO ", 0,10);
- lcd.printString(" ~.~.~.~.<8>~ ", 0, 5);
-
- }
- lcd.refresh();
}
}
-void Snake::render(N5110 &lcd)
+void Snake::gameover_true(N5110 &lcd, Gamepad &pad)
{
+ while (_gameover == true) { //As _gameover is a member variable, if the condition is the previous function is met, the true value will be stored in _gameover and can be accessed in this function
+ lcd.clear();
+ pad.tone(500,1);
+ lcd.printString( " Game Over ", 0, 1 );
+ lcd.printString( " ~~~~~~~<:>-<", 0, 3 );
+ char buffer1[14];
+ sprintf(buffer1," Score: %2d", _score); //prints your score - cannot simply use N5110::printString as we need to output a value and the No. of inputs wouldnt match up to the function declaration
+ lcd.printString(buffer1,0,4); // font is 8 wide, so leave 4 pixel gape from middle assuming two digits ///print score
+
+ lcd.refresh();
+ }
+}
+
+void Snake::render(N5110 &lcd) //final function in the main function's while loop as the screen updatesbased on all any changes which occur in the functions
+{
+ lcd.clear();
//apple
- lcd.setPixel(_apx, _apy,1); //apple
+ lcd.setPixel(_apx, _apy,1); //plot apple position -whether it is a new position or the same position
- lcd.drawRect(0, 0, 84, 40, FILL_TRANSPARENT); //game
- lcd.setPixel(_x0, _y0,1); //snake
+ lcd.drawRect(15, 0, 54, 32, FILL_TRANSPARENT); //plots border of snake map
+
+ lcd.setPixel(_x0, _y0,1); //plots snake body's new position changed by move_snake() function
lcd.setPixel(_x1, _y1,1);
lcd.setPixel(_x2, _y2,1);
lcd.setPixel(_x3, _y3,1);
lcd.setPixel(_x4, _y4,1);
lcd.setPixel(_x5, _y5,1);
- }
+ lcd.setPixel(_x6, _y6,1);
+ lcd.setPixel(_x7, _y7,1); //new position of the end bit of the snake is plotted - its old position cleared
+ //NOTES CHANGLE LED VALUES SO IT IS TOP RIHGT OF THE BOX NOT TOP HALF OF THE SCREEN //CHANGE APPLE POSITION COORDINATES SO ITS IN BOX // GET SCORE IN THE SAME PLACE WHEN IT PRINTS AT END
+
+ char buffer1[14];
+ sprintf(buffer1," %2d %2d",_score, _countdown); //prints score and counter on the same line
+ lcd.printString(buffer1,0,5); // font is 8 wide, so leave 4 pixel gape from middle assuming two digits
+
+
+// char buffer2[14];
+ // sprintf(buffer2,"%2d",_score);
+ // lcd.printString(buffer2,0,3); // font is 8 wide, so leave 4 pixel gape from middle assuming two digits
+
+ lcd.refresh(); //applies plotting commands togeher
+}
@@ -145,27 +152,27 @@
void Snake::get_direction(Gamepad &pad)
{
- // int x;
- Directions direction = _direction;
- if(direction != left) {
+ // int x;
+ Directions direction = _direction; //"direction" stores the previous value of _direction to stop the snake going in the opposite direction to the way its travelling
+
+ if(direction != left) { //if current direction is left, the not statement is false blocking access to the next command from the 'A' button preventing _direction being set to right
if (pad.A_pressed()) {
_direction = right;
- // x=1;
+ // x=1;
}
}
if(direction != right) {
if (pad.Y_pressed()) {
_direction = left;
- // x=2;
+ // x=2;
}
- //check these are orrecrt
}
if(direction != down) {
if (pad.B_pressed()) {
- // x=3;
+ // x=3;
_direction = up;
}
}
@@ -173,35 +180,47 @@
if (pad.X_pressed()) {
_direction = down;
- // x=4;
+ // x=4;
}
} else {
- _direction = _direction;
+ _direction = _direction; // setting the direction equal to itself if no button is pressed means the snake will move automatically once direction is set
}
- // printf("direction %d ", x);
+ // printf("direction %d ", x); //printf statements used in CoolTerm to check whether the input commands where working correctly
}
void Snake::move_snake()
{
- if (_direction == up) {
- _x5 = _x4;
- _x4 = _x3;
+ if (_direction == up) { //shifting the snake position bit by bit, with respect to _x0 and _y0;
+ _x7 = _x6; //coordinate _x[i], _y[i] = _x[i-1], _y[i-1]
+ _y7 = _y6;
+ _x6 = _x5;
+ _y6 = _y5;
+ _x5 = _x4;
+ _y5 = _y4;
+ _x4 = _x3;
+ _y4 = _y3;
_x3 = _x2;
_y3 = _y2;
_x2 = _x1;
_y2 = _y1;
_x1 = _x0;
- _y1 = _y0;
+ _y1 = _y0; //_x1 ,_y1 and must be assingned to _x0,_y0 before its own position updates otherwise bit 0 and bit 1 would be plotted as 1 pixel
_x0 = _x0;
- _y0 = _y0 + 1;
+ _y0 = _y0 + 1; //changes the position one bit at a time so the snake can only move horizontally or vertically
}
if (_direction == down) {
+ _x7 = _x6;
+ _y7 = _y6;
+ _x6 = _x5;
+ _y6 = _y5;
_x5 = _x4;
+ _y5 = _y4;
_x4 = _x3;
+ _y4 = _y3;
_x3 = _x2;
_y3 = _y2;
_x2 = _x1;
@@ -214,8 +233,14 @@
}
if (_direction == left) {
+ _x7 = _x6;
+ _y7 = _y6;
+ _x6 = _x5;
+ _y6 = _y5;
_x5 = _x4;
_y5 = _y4;
+ _x4 = _x3;
+ _y4 = _y3;
_x3 = _x2;
_y3 = _y2;
_x2 = _x1;
@@ -223,7 +248,7 @@
_x1 = _x0;
_y1 = _y0;
- _x0 = _x0 - 1;
+ _x0 = _x0 - 1; //changes x=x-1 , y remains the same to move left
_y0 = _y0;
@@ -231,8 +256,14 @@
}
if (_direction == right) {
+ _x7 = _x6;
+ _y7 = _y6;
+ _x6 = _x5;
+ _y6 = _y5;
_x5 = _x4;
_y5 = _y4;
+ _x4 = _x3;
+ _y4 = _y3;
_x3 = _x2;
_y3 = _y2;
_x2 = _x1;
@@ -244,18 +275,17 @@
_y0 = _y0;
- } else
- _direction = _direction;
+ }
}
void Snake::render_clear_tail(N5110 &lcd)
{
- lcd.setPixel(_x5, _y5, false);
+ lcd.setPixel(_x7, _y7, false); //sets the end pixel to 0. it must be set to 0 before its position updates otherwise the snakebody will grow continually from _x7, _y7 coordinate
}
-bool Snake::get_gameover()
+bool Snake::get_gameover() //methods to access member variables of the class
{
return _gameover;
}
@@ -263,70 +293,21 @@
{
return _score;
}
-int Snake::get_oldscore()
-{
- return _oldscore;
-}
-int Snake::get_reset_value()
-{
- return _reset_value;
-}
+
+
void Snake::get_Apple_position(N5110 &lcd)
{
- if(_reset_apple == true)
- {
- lcd.setPixel(_apx, _apy,0);
- _apx = rand()%82+1;
- _apy = rand()%30+1;
+ if(_reset_apple == true) { // _reset_apple is a triggered when an apple is collected and causes a new Apple position to be randomly generated
+ _reset_apple = false; // returned to false immediately so another position can be generated function can be triggered again in the next loop
+ lcd.setPixel(_apx, _apy,0); //sets the exisiting apple position to 0 to remove it from lcd.
+ _apx = rand()%52+16; //54 = width of the rectangle on the lcd. - the x value of the apple has a range of 52 so it cannot spawn in either side of the wall
+ // the range is from 16 to 69 as the lowest x coordinate of the rectangle is 15 and the highest is 69
+ _apy = rand()%28+2;
+ }
- _reset_apple = false;
- } else {
- _apx = _apx;
- _apy = _apy;
- }
}
-/*
-void Snake::get_time(Timer &timer)
-{
- ticker.attach(&flip, 2.0);
- _realtime = timer.read();
- _display_time = (Reset_value - _realtime);
- int x = _realtime;
- int y = _display_time;
- printf("12-T = %d t = %d ", y, x);
-*/
-
-int Snake::set_reset_value()
-{
-
- if (0 <= _score && _score < 10) {
- _reset_value = 12;
- }
- if (10 <= _score && _score < 15) {
- _reset_value = 10;
- }
- if (15 <= _score && _score < 20) {
- _reset_value = 8;
- } else {
- _reset_value = 6;
- }
-
- return _reset_value;
-}
-
-
-//void Snake::print_display_time(N5110 &lcd)
-//{
- // int countdown = _realtime;
-
- // char buffer1[14];
- //sprintf(buffer1,"%2d",countdown);
- //lcd.printString(buffer1,WIDTH/2,30); // font is 8 wide, so leave 4 pixel gape from middle assuming two digits
- //char buffer2[14];
-
-//}
\ No newline at end of file