Kinga Magyar / snake

snake game from https://github.com/lancaster-university/microbit-samples/tree/master/source/examples/snake

Dependencies:   microbit

main.cpp@0:59c42b44cf60, 2017-01-19 (annotated)

Committer:
kinga
Date:
Thu Jan 19 11:38:22 2017 +0000
Revision:
0:59c42b44cf60
Version 1.0 of the popular snake game

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kinga 0:59c42b44cf60 1 #include "MicroBit.h"
kinga 0:59c42b44cf60 2
kinga 0:59c42b44cf60 3 #define SNAKE_EMPTY 0
kinga 0:59c42b44cf60 4 #define SNAKE_UP 1
kinga 0:59c42b44cf60 5 #define SNAKE_LEFT 2
kinga 0:59c42b44cf60 6 #define SNAKE_RIGHT 3
kinga 0:59c42b44cf60 7 #define SNAKE_DOWN 4
kinga 0:59c42b44cf60 8
kinga 0:59c42b44cf60 9 #define SNAKE_FRAME_DELAY 350
kinga 0:59c42b44cf60 10 #define GROWTH_SPEED 3
kinga 0:59c42b44cf60 11
kinga 0:59c42b44cf60 12 struct Point
kinga 0:59c42b44cf60 13 {
kinga 0:59c42b44cf60 14 int x;
kinga 0:59c42b44cf60 15 int y;
kinga 0:59c42b44cf60 16 };
kinga 0:59c42b44cf60 17
kinga 0:59c42b44cf60 18 MicroBit uBit;
kinga 0:59c42b44cf60 19 Point head; // Location of the head of our snake.
kinga 0:59c42b44cf60 20 Point tail; // Location of the tail of our snake.
kinga 0:59c42b44cf60 21 Point food; // Location of food.
kinga 0:59c42b44cf60 22 MicroBitImage map(5,5);
kinga 0:59c42b44cf60 23
kinga 0:59c42b44cf60 24 void place_food()
kinga 0:59c42b44cf60 25 {
kinga 0:59c42b44cf60 26 int r = uBit.random(24);
kinga 0:59c42b44cf60 27 int x = 0; int y = 0;
kinga 0:59c42b44cf60 28
kinga 0:59c42b44cf60 29 while (r > 0)
kinga 0:59c42b44cf60 30 {
kinga 0:59c42b44cf60 31 x = (x+1) % 5;
kinga 0:59c42b44cf60 32 if (x == 0)
kinga 0:59c42b44cf60 33 y = (y+1) % 5;
kinga 0:59c42b44cf60 34
kinga 0:59c42b44cf60 35 if(map.getPixelValue(x,y) == SNAKE_EMPTY)
kinga 0:59c42b44cf60 36 r--;
kinga 0:59c42b44cf60 37 }
kinga 0:59c42b44cf60 38
kinga 0:59c42b44cf60 39 food.x = x;
kinga 0:59c42b44cf60 40 food.y = y;
kinga 0:59c42b44cf60 41 }
kinga 0:59c42b44cf60 42
kinga 0:59c42b44cf60 43 void snake()
kinga 0:59c42b44cf60 44 {
kinga 0:59c42b44cf60 45 Point newHead; // Calculated placement of new head position based on user input.
kinga 0:59c42b44cf60 46 int hdirection; // Head's direction of travel
kinga 0:59c42b44cf60 47 int tdirection; // Tail's direction of travel
kinga 0:59c42b44cf60 48 int snakeLength; // number of segments in the snake.
kinga 0:59c42b44cf60 49 int growing; // boolean state indicating if we've just eaten some food.
kinga 0:59c42b44cf60 50 int score;
kinga 0:59c42b44cf60 51
kinga 0:59c42b44cf60 52 // Start in the middle of the screen.
kinga 0:59c42b44cf60 53 tail.x = tail.y = 2;
kinga 0:59c42b44cf60 54 head.x = head.y = 2;
kinga 0:59c42b44cf60 55 snakeLength = 1;
kinga 0:59c42b44cf60 56 growing = 0;
kinga 0:59c42b44cf60 57 score = 0;
kinga 0:59c42b44cf60 58 map.clear();
kinga 0:59c42b44cf60 59
kinga 0:59c42b44cf60 60 uBit.display.image.setPixelValue(head.x, head.y, 255);
kinga 0:59c42b44cf60 61
kinga 0:59c42b44cf60 62 // Add some random food.
kinga 0:59c42b44cf60 63 place_food();
kinga 0:59c42b44cf60 64
kinga 0:59c42b44cf60 65 while (1)
kinga 0:59c42b44cf60 66 {
kinga 0:59c42b44cf60 67 // Flash the food is necessary;
kinga 0:59c42b44cf60 68 uBit.display.image.setPixelValue(food.x, food.y, uBit.systemTime() % 1000 < 500 ? 0 : 255);
kinga 0:59c42b44cf60 69
kinga 0:59c42b44cf60 70 int dx = uBit.accelerometer.getX();
kinga 0:59c42b44cf60 71 int dy = uBit.accelerometer.getY();
kinga 0:59c42b44cf60 72
kinga 0:59c42b44cf60 73 newHead.x = head.x;
kinga 0:59c42b44cf60 74 newHead.y = head.y;
kinga 0:59c42b44cf60 75
kinga 0:59c42b44cf60 76 if (abs(dx) > abs(dy))
kinga 0:59c42b44cf60 77 {
kinga 0:59c42b44cf60 78 if(dx < 0)
kinga 0:59c42b44cf60 79 {
kinga 0:59c42b44cf60 80 hdirection = SNAKE_LEFT;
kinga 0:59c42b44cf60 81 newHead.x = newHead.x == 0 ? 4 : newHead.x-1;
kinga 0:59c42b44cf60 82 }
kinga 0:59c42b44cf60 83 else
kinga 0:59c42b44cf60 84 {
kinga 0:59c42b44cf60 85 hdirection = SNAKE_RIGHT;
kinga 0:59c42b44cf60 86 newHead.x = newHead.x == 4 ? 0 : newHead.x+1;
kinga 0:59c42b44cf60 87 }
kinga 0:59c42b44cf60 88 }
kinga 0:59c42b44cf60 89 else
kinga 0:59c42b44cf60 90 {
kinga 0:59c42b44cf60 91 if(dy < 0)
kinga 0:59c42b44cf60 92 {
kinga 0:59c42b44cf60 93 hdirection = SNAKE_UP;
kinga 0:59c42b44cf60 94 newHead.y = newHead.y == 0 ? 4 : newHead.y-1;
kinga 0:59c42b44cf60 95 }
kinga 0:59c42b44cf60 96 else
kinga 0:59c42b44cf60 97 {
kinga 0:59c42b44cf60 98 hdirection = SNAKE_DOWN;
kinga 0:59c42b44cf60 99 newHead.y = newHead.y == 4 ? 0 : newHead.y+1;
kinga 0:59c42b44cf60 100 }
kinga 0:59c42b44cf60 101 }
kinga 0:59c42b44cf60 102
kinga 0:59c42b44cf60 103 int status = map.getPixelValue(newHead.x, newHead.y);
kinga 0:59c42b44cf60 104 if (status == SNAKE_UP || status == SNAKE_DOWN || status == SNAKE_LEFT || status == SNAKE_RIGHT)
kinga 0:59c42b44cf60 105 {
kinga 0:59c42b44cf60 106 uBit.display.scroll("GAME OVER! SCORE: ");
kinga 0:59c42b44cf60 107 uBit.display.scroll(score);
kinga 0:59c42b44cf60 108
kinga 0:59c42b44cf60 109 return;
kinga 0:59c42b44cf60 110 }
kinga 0:59c42b44cf60 111
kinga 0:59c42b44cf60 112 // move the head.
kinga 0:59c42b44cf60 113 map.setPixelValue(head.x, head.y, hdirection);
kinga 0:59c42b44cf60 114 uBit.display.image.setPixelValue(newHead.x, newHead.y, 255);
kinga 0:59c42b44cf60 115
kinga 0:59c42b44cf60 116 if (growing == GROWTH_SPEED)
kinga 0:59c42b44cf60 117 {
kinga 0:59c42b44cf60 118 growing = 0;
kinga 0:59c42b44cf60 119 snakeLength++;
kinga 0:59c42b44cf60 120 }
kinga 0:59c42b44cf60 121 else
kinga 0:59c42b44cf60 122 {
kinga 0:59c42b44cf60 123 // move the tail.
kinga 0:59c42b44cf60 124 tdirection = map.getPixelValue(tail.x,tail.y);
kinga 0:59c42b44cf60 125 map.setPixelValue(tail.x, tail.y, SNAKE_EMPTY);
kinga 0:59c42b44cf60 126 uBit.display.image.setPixelValue(tail.x, tail.y, 0);
kinga 0:59c42b44cf60 127
kinga 0:59c42b44cf60 128 // Move our record of the tail's location.
kinga 0:59c42b44cf60 129 if (snakeLength == 1)
kinga 0:59c42b44cf60 130 {
kinga 0:59c42b44cf60 131 tail.x = newHead.x;
kinga 0:59c42b44cf60 132 tail.y = newHead.y;
kinga 0:59c42b44cf60 133 }
kinga 0:59c42b44cf60 134 else
kinga 0:59c42b44cf60 135 {
kinga 0:59c42b44cf60 136 if (tdirection == SNAKE_UP)
kinga 0:59c42b44cf60 137 tail.y = tail.y == 0 ? 4 : tail.y-1;
kinga 0:59c42b44cf60 138
kinga 0:59c42b44cf60 139 if (tdirection == SNAKE_DOWN)
kinga 0:59c42b44cf60 140 tail.y = tail.y == 4 ? 0 : tail.y+1;
kinga 0:59c42b44cf60 141
kinga 0:59c42b44cf60 142 if (tdirection == SNAKE_LEFT)
kinga 0:59c42b44cf60 143 tail.x = tail.x == 0 ? 4 : tail.x-1;
kinga 0:59c42b44cf60 144
kinga 0:59c42b44cf60 145 if (tdirection == SNAKE_RIGHT)
kinga 0:59c42b44cf60 146 tail.x = tail.x == 4 ? 0 : tail.x+1;
kinga 0:59c42b44cf60 147 }
kinga 0:59c42b44cf60 148 }
kinga 0:59c42b44cf60 149
kinga 0:59c42b44cf60 150 // Update our record of the head location and away we go!
kinga 0:59c42b44cf60 151 head.x = newHead.x;
kinga 0:59c42b44cf60 152 head.y = newHead.y;
kinga 0:59c42b44cf60 153
kinga 0:59c42b44cf60 154 // if we've eaten some food, replace the food and grow ourselves!
kinga 0:59c42b44cf60 155 if (head.x == food.x && head.y == food.y)
kinga 0:59c42b44cf60 156 {
kinga 0:59c42b44cf60 157 growing++;
kinga 0:59c42b44cf60 158 score++;
kinga 0:59c42b44cf60 159 place_food();
kinga 0:59c42b44cf60 160 }
kinga 0:59c42b44cf60 161
kinga 0:59c42b44cf60 162 uBit.sleep(SNAKE_FRAME_DELAY);
kinga 0:59c42b44cf60 163 }
kinga 0:59c42b44cf60 164 }
kinga 0:59c42b44cf60 165
kinga 0:59c42b44cf60 166 int main()
kinga 0:59c42b44cf60 167 {
kinga 0:59c42b44cf60 168 // Initialise the micro:bit runtime.
kinga 0:59c42b44cf60 169 uBit.init();
kinga 0:59c42b44cf60 170
kinga 0:59c42b44cf60 171 // Insert your code here!
kinga 0:59c42b44cf60 172 uBit.display.scroll("SNAKE v1.0");
kinga 0:59c42b44cf60 173
kinga 0:59c42b44cf60 174 while(1)
kinga 0:59c42b44cf60 175 snake();
kinga 0:59c42b44cf60 176 }
kinga 0:59c42b44cf60 177