103 lines
2.3 KiB
TypeScript
103 lines
2.3 KiB
TypeScript
/// <reference lib="dom" />
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export const game = true
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import type { GameContext, InputState } from "@/shared/game"
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import { rng } from "@/shared/utils.ts"
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const CELL = 20
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const WIDTH = 30
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const HEIGHT = 20
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const TICK = 5
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let snake: { x: number; y: number }[] = [{ x: 5, y: 5 }]
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let dir = { x: 1, y: 0 }
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let food = { x: rng(WIDTH) - 1, y: rng(HEIGHT) - 1 }
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let dead = false
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let tick = 0
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export function init() {
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snake = [{ x: 5, y: 5 }]
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dir = { x: 1, y: 0 }
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food = { x: rng(WIDTH) - 1, y: rng(HEIGHT) - 1 }
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dead = false
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tick = 0
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}
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export function update(_delta: number, input: InputState) {
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if (dead) return
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const keys = input.pressed
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if (keys.has("ArrowUp") || keys.has("w")) dir = { x: 0, y: -1 }
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if (keys.has("ArrowDown") || keys.has("s")) dir = { x: 0, y: 1 }
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if (keys.has("ArrowLeft") || keys.has("a")) dir = { x: -1, y: 0 }
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if (keys.has("ArrowRight") || keys.has("d")) dir = { x: 1, y: 0 }
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// move every $TICK ticks
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if (++tick % TICK !== 0) return
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const head = { x: snake[0]!.x + dir.x, y: snake[0]!.y + dir.y }
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// death checks
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dead = head.x < 0 || head.x >= WIDTH || head.y < 0 || head.y >= HEIGHT ||
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snake.some(s => s.x === head.x && s.y === head.y)
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if (dead) return
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snake.unshift(head)
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// eat
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if (head.x === food.x && head.y === food.y) {
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food = { x: rng(WIDTH) - 1, y: rng(HEIGHT) - 1 }
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} else {
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snake.pop()
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}
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}
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export function draw(game: GameContext) {
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game.clear()
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game.rectfill(0, 0, game.width, game.height, "black")
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const boardW = WIDTH * CELL
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const boardH = HEIGHT * CELL
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// move board center → canvas center
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const offsetX = (game.width - boardW) / 2
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const offsetY = (game.height - boardH) / 2
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console.log("X", offsetX)
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console.log("Y", offsetY)
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const c = game.ctx
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c.save()
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c.translate(offsetX, offsetY)
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// board background (now local 0,0 is board top-left)
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game.rectfill(0, 0, boardW, boardH, "green")
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// food
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game.rectfill(
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food.x * CELL, food.y * CELL,
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(food.x + 1) * CELL, (food.y + 1) * CELL,
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"lime"
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)
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// snake
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for (const s of snake) {
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game.rectfill(
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s.x * CELL, s.y * CELL,
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((s.x + 1) * CELL) + .5, ((s.y + 1) * CELL) + .5,
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"magenta"
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)
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}
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// score!
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game.text(`Score: ${snake.length - 1}`, 5, boardH - 18, "cyan", 12)
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c.restore()
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if (dead) {
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game.centerText("GAME OVER", "red", 50)
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}
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}
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