SCRIPT-8

README.md

This is a SCRIPT-8 cassette. Click here to boot it.

chains.json

{}

code.js

// title: Snake Game

initialState = {
  speed: 22,
  totalElapsed: 0,
  lastElapsed: 0,
  score: 0,
  direction: "left",
  snakeBody: [
    [20, 20],
    [21, 20],
    [22, 20],
    [23, 20],
    [24, 20],
  ],
  food: {
    x: 20,
    y: 30
  },
  box: {
    size: 100,
    x: 5,
    y: 13
  }
}

var directionOpposingMap = {
  up: "down",
  down: "up",
  left: "right",
  right: "left"
}

update = (state, input, elapsed) => {
  // speed control
  state.totalElapsed += elapsed;
  if ( state.totalElapsed - state.lastElapsed <= 1000 / state.speed){
    return;
  }
  state.lastElapsed = state.totalElapsed;
  
  // variables
  var head = state.snakeBody[0];
  var food = state.food;
  const {box} = state;
  var nextNode = null;
 
  // speed custom setting
  if (input.a){state.speed += 1};
  if (input.b){state.speed -= 1};

  // direction changing
  for (var key in input){
    if (key in directionOpposingMap &&
        input[key]===true &&
        key != state.direction &&
        key != directionOpposingMap[state.direction]) {
      state.direction = key;
      break;
    }
  }
  
  if (state.direction==="up"){ nextNode=[head[0],head[1]-1]};
  if (state.direction==="down"){nextNode=[head[0],head[1]+1]};
  if (state.direction==="left"){nextNode=[head[0]-1,head[1]]};
  if (state.direction==="right"){nextNode=[head[0]+1,head[1]]};
  
  // box detect
  if (nextNode[0] <= box.x ) {
    nextNode[0] = box.x + box.size - 1;
  }else if (nextNode[0] >= (box.x + box.size - 1) ) {
    nextNode[0] = box.x + 1;
  }else if (nextNode[1] <= box.y ) {
    nextNode[1] = box.y + box.size - 1;
  }else if (nextNode[1] >= (box.y + box.size - 1) ) {
    nextNode[1] = box.y + 1;
  }
  
  // snake body changing
  state.snakeBody.unshift(nextNode);
  if (head[0] == state.food.x && head[1] == state.food.y) {
    var randomNum = Math.floor(Math.random() * Math.floor(box.size - 1));
    food.x = box.x + 1 + randomNum;
    food.y = box.y + 1 + randomNum;
    state.score += 10;
    return;
  }
  state.snakeBody.pop();
}

draw = (state) => {
  clear();
  const {box, food} = state;
  print(0, 0, `score: ${state.score}`);
  print(76, 0, `speed: ${state.speed}`);
  print(0, 118, "press a, b to change speed");
  circStroke(food.x, food.y, 1);
  state.snakeBody.forEach(node => {
    var x = node[0], y = node[1];
    circStroke(x, y, 1);
  });
  rectStroke( box.x, box.y, box.size, box.size);
}

map.json

[]

phrases.json

{}

songs.json

{}

sprites.json

{}