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Snek/Snek.cpp@17:2a909f7da973, 2018-05-08 (annotated)

Committer:
Andrew_M
Date:
Tue May 08 14:52:29 2018 +0000
Revision:
17:2a909f7da973
Parent:
15:130900e5c268 
More comments and debugging tools added

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Andrew_M 1:a14415de3ad5 1 #include "Snek.h"
Andrew_M 1:a14415de3ad5 2
Andrew_M 1:a14415de3ad5 3 // nothing doing in the constructor and destructor
Andrew_M 1:a14415de3ad5 4 Snek::Snek()
Andrew_M 1:a14415de3ad5 5 {
Andrew_M 1:a14415de3ad5 6
Andrew_M 1:a14415de3ad5 7 }
Andrew_M 1:a14415de3ad5 8
Andrew_M 1:a14415de3ad5 9 Snek::~Snek()
Andrew_M 1:a14415de3ad5 10 {
Andrew_M 1:a14415de3ad5 11
Andrew_M 1:a14415de3ad5 12 }
Andrew_M 1:a14415de3ad5 13
Andrew_M 2:9ca5e1c221c3 14 void Snek::init(int x, int y)
Andrew_M 1:a14415de3ad5 15 {
Andrew_M 15:130900e5c268 16 memset(_x, 0, sizeof(_x)); //clears the x coordinate array
Andrew_M 15:130900e5c268 17 memset(_y, 0, sizeof(_y)); //clears the y coordinate array
Andrew_M 17:2a909f7da973 18
Andrew_M 1:a14415de3ad5 19 //Inital values for variables
Andrew_M 4:6353f829c56c 20 _length = 3;
Andrew_M 7:c1e0593bfc99 21
Andrew_M 5:a3a9e0417e04 22 _oldDirection = 'N';
Andrew_M 4:6353f829c56c 23
Andrew_M 15:130900e5c268 24 for (int i = 0; i < _length; i++) { //sets the starting values for the snake coordinates
Andrew_M 15:130900e5c268 25 _x[i] = x; //all have the same X coordinate
Andrew_M 17:2a909f7da973 26 _y[i] = y + i; //the Y coordinate is incremmented for each tail segment
Andrew_M 4:6353f829c56c 27 }
Andrew_M 17:2a909f7da973 28
Andrew_M 17:2a909f7da973 29 printf("Snake Initialised\n");
Andrew_M 1:a14415de3ad5 30 }
Andrew_M 1:a14415de3ad5 31
Andrew_M 2:9ca5e1c221c3 32 void Snek::update(Direction d)
Andrew_M 2:9ca5e1c221c3 33 {
Andrew_M 5:a3a9e0417e04 34 for (int i = _length-1; i >= 1; i--) {
Andrew_M 7:c1e0593bfc99 35 _x[i] = _x[i-1];
Andrew_M 7:c1e0593bfc99 36 _y[i] = _y[i-1];
Andrew_M 5:a3a9e0417e04 37 }
Andrew_M 7:c1e0593bfc99 38
Andrew_M 15:130900e5c268 39 if (d == N && _oldDirection != 'S') { //checks the new direction so the snake cannot go back on itself
Andrew_M 15:130900e5c268 40 _y[0] -= 1; //changes a coordinate of the snake's head
Andrew_M 15:130900e5c268 41 _oldDirection = 'N'; //updates the _oldDirection so the snake will travel in the new direction with no play input
Andrew_M 17:2a909f7da973 42 printf("Snake has changed North\n");
Andrew_M 5:a3a9e0417e04 43 } else if (d == S && _oldDirection != 'N') {
Andrew_M 4:6353f829c56c 44 _y[0] += 1;
Andrew_M 3:6253a2d374fa 45 _oldDirection = 'S';
Andrew_M 17:2a909f7da973 46 printf("Snake has changed South\n");
Andrew_M 5:a3a9e0417e04 47 } else if (d == E && _oldDirection != 'W') {
Andrew_M 4:6353f829c56c 48 _x[0] += 1;
Andrew_M 3:6253a2d374fa 49 _oldDirection = 'E';
Andrew_M 17:2a909f7da973 50 printf("Snake has changed East\n");
Andrew_M 5:a3a9e0417e04 51 } else if (d == W && _oldDirection != 'E') {
Andrew_M 4:6353f829c56c 52 _x[0] -= 1;
Andrew_M 3:6253a2d374fa 53 _oldDirection = 'W';
Andrew_M 17:2a909f7da973 54 printf("Snake has changed West\n");
Andrew_M 15:130900e5c268 55 } else { //if there is no player input (new direction)...
Andrew_M 15:130900e5c268 56 if (_oldDirection == 'N') { //checks the old direction...
Andrew_M 15:130900e5c268 57 _y[0] -= 1; //and changes a coordinate of the snake's head depending on the _oldDirection
Andrew_M 3:6253a2d374fa 58 } else if (_oldDirection == 'S') {
Andrew_M 4:6353f829c56c 59 _y[0] += 1;
Andrew_M 3:6253a2d374fa 60 } else if (_oldDirection == 'E') {
Andrew_M 4:6353f829c56c 61 _x[0] += 1;
Andrew_M 3:6253a2d374fa 62 } else if (_oldDirection == 'W') {
Andrew_M 4:6353f829c56c 63 _x[0] -= 1;
Andrew_M 3:6253a2d374fa 64 }
Andrew_M 17:2a909f7da973 65 printf("Snake hasn't changed direction\n");
Andrew_M 7:c1e0593bfc99 66 }
Andrew_M 2:9ca5e1c221c3 67 }
Andrew_M 2:9ca5e1c221c3 68
Andrew_M 4:6353f829c56c 69 int Snek::getX(int ref)
Andrew_M 1:a14415de3ad5 70 {
Andrew_M 4:6353f829c56c 71 return _x[ref];
Andrew_M 2:9ca5e1c221c3 72 }
Andrew_M 1:a14415de3ad5 73
Andrew_M 4:6353f829c56c 74 int Snek::getY(int ref)
Andrew_M 2:9ca5e1c221c3 75 {
Andrew_M 4:6353f829c56c 76 return _y[ref];
Andrew_M 2:9ca5e1c221c3 77 }
Andrew_M 4:6353f829c56c 78
Andrew_M 4:6353f829c56c 79 int Snek::getLength()
Andrew_M 4:6353f829c56c 80 {
Andrew_M 4:6353f829c56c 81 return _length;
Andrew_M 4:6353f829c56c 82 }
Andrew_M 5:a3a9e0417e04 83
Andrew_M 5:a3a9e0417e04 84 void Snek::grow()
Andrew_M 5:a3a9e0417e04 85 {
Andrew_M 15:130900e5c268 86 _length+=1; //increments the length of the snake
Andrew_M 17:2a909f7da973 87 printf("Snake has grown\n");
Andrew_M 5:a3a9e0417e04 88 }
Andrew_M 7:c1e0593bfc99 89