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58 lines
2.2 KiB
58 lines
2.2 KiB
4 years ago
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const SIZE = 100
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const MAP = new Int8Array(SIZE * SIZE) // State of the Map
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const isFree = ({ x, y }) => MAP[y * SIZE + x] === 0 // 0 = block free
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const isOccupied = ({ x, y }) => MAP[y * SIZE + x] === 1 // 1 = block occupied
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// `inBounds` check if our coord (n) is an existing index in our MAP
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const inBounds = n => n < SIZE && n >= 0
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// `isInBounds` check that properties x and y of our argument are both in bounds
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const isInBounds = ({ x, y }) => inBounds(x) && inBounds(y)
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// `pickRandom` get a random element from an array
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const pickRandom = arr => arr[Math.floor(Math.random() * arr.length)]
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// `addToMap` save the new positions into the map
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const addToMap = ({ x, y }) => MAP[y * SIZE + x] = 1
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// `update` this function is called at each turn
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const update = state => {
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// update is called with a state argument that has 2 properties:
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// players: an array of all the players
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// player: the player for this AI
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// Each players contains:
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// color: A number that represent the color of a player
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// name: A string of the player name
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// score: A number of the total block collected by this player
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// x: The horizontal position of the player
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// y: The vertical position of the player
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// coords: An array of 4 coordinates of the nearest blocks
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// [ NORTH, EAST, SOUTH, WEST ]
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// N
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// W + E
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// S
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// Each coordinate contains:
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// x: The horizontal position
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// y: The vertical position
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// cardinal: A number between 0 and 3 that represent the cardinal
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// [ 0: NORTH, 1: EAST, 2: SOUTH, 3: WEST ]
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// direction: A number between 0 and 3 that represent the direction
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// [ 0: FORWARD, 1: RIGHT, 2: BACKWARD, 3: LEFT ]
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// Saving state between each updates:
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// I update the MAP with the new position of each players
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state.players.forEach(addToMap)
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// Actual AI logic:
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// I filter my array of coords to keep only those that are in bounds
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const coordsInBound = state.player.coords.filter(isInBounds)
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// I filter again to keep coords that are free
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const available = coordsInBound.filter(isFree)
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// And I return a random available coord
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return pickRandom(available)
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}
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