add snake
This commit is contained in:
@@ -23,6 +23,7 @@
|
||||
<li><a href="move.html">Move demo</a></li>
|
||||
<li><a href="life.html">Game of life</a></li>
|
||||
<li><a href="ray.html">Ray</a></li>
|
||||
<li><a href="snake.html">Snake</a></li>
|
||||
</ul>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
Generated
+4
-4
@@ -9,13 +9,13 @@
|
||||
"version": "1.0.0",
|
||||
"license": "ISC",
|
||||
"devDependencies": {
|
||||
"typescript": "^5.7.3"
|
||||
"typescript": "^6.0.2"
|
||||
}
|
||||
},
|
||||
"node_modules/typescript": {
|
||||
"version": "5.7.3",
|
||||
"resolved": "https://registry.npmjs.org/typescript/-/typescript-5.7.3.tgz",
|
||||
"integrity": "sha512-84MVSjMEHP+FQRPy3pX9sTVV/INIex71s9TL2Gm5FG/WG1SqXeKyZ0k7/blY/4FdOzI12CBy1vGc4og/eus0fw==",
|
||||
"version": "6.0.2",
|
||||
"resolved": "https://registry.npmjs.org/typescript/-/typescript-6.0.2.tgz",
|
||||
"integrity": "sha512-bGdAIrZ0wiGDo5l8c++HWtbaNCWTS4UTv7RaTH/ThVIgjkveJt83m74bBHMJkuCbslY8ixgLBVZJIOiQlQTjfQ==",
|
||||
"dev": true,
|
||||
"bin": {
|
||||
"tsc": "bin/tsc",
|
||||
|
||||
+1
-1
@@ -5,6 +5,6 @@
|
||||
"author": "",
|
||||
"license": "ISC",
|
||||
"devDependencies": {
|
||||
"typescript": "^5.7.3"
|
||||
"typescript": "^6.0.2"
|
||||
}
|
||||
}
|
||||
|
||||
@@ -0,0 +1,37 @@
|
||||
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;700&display=swap');
|
||||
|
||||
:root {
|
||||
--bg-color: #0f172a;
|
||||
--canvas-color: #1e293b;
|
||||
--text-color: #f8fafc;
|
||||
}
|
||||
|
||||
body {
|
||||
margin: 0;
|
||||
display: flex;
|
||||
flex-direction: column;
|
||||
align-items: center;
|
||||
justify-content: center;
|
||||
min-height: 100vh;
|
||||
background-color: var(--bg-color);
|
||||
background-image:
|
||||
radial-gradient(at 0% 0%, rgba(30, 41, 59, 0.5) 0, transparent 50%),
|
||||
radial-gradient(at 100% 100%, rgba(15, 23, 42, 0.8) 0, transparent 50%);
|
||||
font-family: 'Outfit', sans-serif;
|
||||
color: var(--text-color);
|
||||
overflow: hidden;
|
||||
}
|
||||
|
||||
.canvas-wrapper {
|
||||
width: 90vmin; /* 90% of the smaller viewport dimension */
|
||||
height: 90vmin;
|
||||
aspect-ratio: 1 / 1;
|
||||
background-color: var(--canvas-color);
|
||||
border-radius: 16px;
|
||||
}
|
||||
|
||||
#game-canvas {
|
||||
display: block;
|
||||
width: 100%;
|
||||
height: 100%;
|
||||
}
|
||||
+16
@@ -0,0 +1,16 @@
|
||||
<!DOCTYPE html>
|
||||
<html lang="en">
|
||||
<head>
|
||||
<meta charset="UTF-8">
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1.0">
|
||||
<title>Game</title>
|
||||
<link rel="stylesheet" type="text/css" href="snake.css" />
|
||||
</head>
|
||||
<body>
|
||||
<h1>Game</h1>
|
||||
<div class="canvas-wrapper">
|
||||
<canvas id="game-canvas"></canvas>
|
||||
</div>
|
||||
<script type="module" src="/snake.js"></script>
|
||||
</body>
|
||||
</html>
|
||||
@@ -0,0 +1,188 @@
|
||||
class Vec2d {
|
||||
x: number;
|
||||
y: number;
|
||||
|
||||
constructor(x: number, y: number) {
|
||||
this.x = x;
|
||||
this.y = y;
|
||||
}
|
||||
|
||||
toString() {
|
||||
return `[${this.x}, ${this.y}]`;
|
||||
}
|
||||
|
||||
scale(scalar: number): Vec2d {
|
||||
return new Vec2d(this.x * scalar, this.y * scalar);
|
||||
}
|
||||
|
||||
add(other: Vec2d): Vec2d {
|
||||
return new Vec2d(this.x + other.x, this.y + other.y);
|
||||
}
|
||||
|
||||
sub(other: Vec2d): Vec2d {
|
||||
return new Vec2d(this.x - other.x, this.y - other.y);
|
||||
}
|
||||
|
||||
length(): number {
|
||||
return Math.sqrt(this.x * this.x + this.y * this.y);
|
||||
}
|
||||
|
||||
distance(other: Vec2d): number {
|
||||
return this.sub(other).length();
|
||||
}
|
||||
|
||||
lerp(other: Vec2d, t: number): Vec2d {
|
||||
// (1-t)*A + B*t
|
||||
return this.scale(1 - t).add(other.scale(t));
|
||||
}
|
||||
|
||||
clamp(min: Vec2d, max: Vec2d): Vec2d {
|
||||
return new Vec2d(
|
||||
Math.min(Math.max(this.x, min.x), max.x),
|
||||
Math.min(Math.max(this.y, min.y), max.y)
|
||||
);
|
||||
}
|
||||
|
||||
wrap(bounds: Vec2d) {
|
||||
return new Vec2d(trueMod(this.x, bounds.x), trueMod(this.y, bounds.y));
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
function trueMod(v: number, max: number): number {
|
||||
return ((v % max) + max) % max;
|
||||
}
|
||||
|
||||
// constants
|
||||
const SNAKE_SIZE = 20;
|
||||
const SNAKE_PADDING = 10;
|
||||
const SEGMENT_SPACING = SNAKE_SIZE + SNAKE_PADDING;
|
||||
const HEAD_COLOR = 0xf43f5e;
|
||||
const TAIL_COLOR = 0xf4c3cc;
|
||||
const APPLE_COLOR = 0x58f474;
|
||||
|
||||
// state
|
||||
let snake_body = [new Vec2d(100, 100), new Vec2d(100 - SEGMENT_SPACING, 100), new Vec2d(100 - SEGMENT_SPACING * 2, 100)];
|
||||
let apple: Vec2d | undefined = undefined;
|
||||
let velocity: Vec2d = new Vec2d(1, 0); // unit vector. Start by moving right
|
||||
let speed = 200; // px/s
|
||||
|
||||
let interpolation_factor = 10;
|
||||
|
||||
function resizeCanvas(ctx: CanvasRenderingContext2D) {
|
||||
ctx.canvas.width = ctx.canvas.clientWidth;
|
||||
ctx.canvas.height = ctx.canvas.clientHeight;
|
||||
ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
|
||||
}
|
||||
|
||||
function drawCircle(ctx: CanvasRenderingContext2D, center: Vec2d, radius: number, color: string) {
|
||||
ctx.save();
|
||||
ctx.beginPath();
|
||||
ctx.arc(center.x, center.y, radius, 0, 2 * Math.PI);
|
||||
ctx.fillStyle = color;
|
||||
ctx.fill();
|
||||
ctx.restore();
|
||||
}
|
||||
|
||||
let lastTime: number | undefined = undefined;
|
||||
|
||||
function update(ctx: CanvasRenderingContext2D, t: number) {
|
||||
if (lastTime == null) lastTime = t;
|
||||
const dt = (t - lastTime) / 1000; // s
|
||||
lastTime = t;
|
||||
apple = apple as Vec2d;
|
||||
const bounds = new Vec2d(ctx.canvas.width, ctx.canvas.height);
|
||||
|
||||
// update head position
|
||||
snake_body[0] = snake_body[0].add(velocity.scale(speed * dt))
|
||||
// update body position by following the segment in front
|
||||
for (let i = 1; i < snake_body.length; i++) {
|
||||
const leader = snake_body[i - 1];
|
||||
const delta = leader.sub(snake_body[i]);
|
||||
const dist = delta.length();
|
||||
if (dist > SEGMENT_SPACING) {
|
||||
const unit = delta.scale(1 / dist); // unit vector in direction of delta
|
||||
snake_body[i] = leader.sub(unit.scale(SEGMENT_SPACING));
|
||||
}
|
||||
}
|
||||
|
||||
// collisions
|
||||
// convert snake_head coords to screen space
|
||||
//const head = wrapCoords(snake_body[0], bounds);
|
||||
const head = snake_body[0].wrap(bounds)
|
||||
// check if snake head is overlapping apple
|
||||
if (head.distance(apple) < SNAKE_SIZE) {
|
||||
apple = getRandomPos(ctx.canvas.width, ctx.canvas.height);
|
||||
const { x: lastX, y: lastY } = snake_body[snake_body.length - 1];
|
||||
snake_body.push(new Vec2d(lastX, lastY));
|
||||
speed += 10;
|
||||
}
|
||||
|
||||
// draw apple
|
||||
ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
|
||||
drawCircle(ctx, apple, SNAKE_SIZE / 2, `#${APPLE_COLOR.toString(16)}`)
|
||||
|
||||
// draw snake
|
||||
for (let i = 0; i < snake_body.length - 1; ++i) {
|
||||
// draw a trail of overlapping circles by interpolating between the body positions
|
||||
for (let j = 0; j < interpolation_factor; ++j) {
|
||||
const pos = snake_body[i].lerp(snake_body[i + 1], j / interpolation_factor).wrap(bounds);
|
||||
const color = lerpColor(HEAD_COLOR, TAIL_COLOR, (i + interpolation_factor / 10) / snake_body.length)
|
||||
drawCircle(ctx, pos, SNAKE_SIZE / 2, `#${color.toString(16)}`)
|
||||
}
|
||||
}
|
||||
const tail = snake_body[snake_body.length - 1].wrap(bounds)
|
||||
drawCircle(ctx, tail, SNAKE_SIZE / 2, `#${TAIL_COLOR.toString(16)}`)
|
||||
|
||||
window.requestAnimationFrame((t) => update(ctx, t));
|
||||
}
|
||||
|
||||
function getRandomPos(maxX: number, maxY: number): Vec2d {
|
||||
return new Vec2d(Math.random() * maxX, Math.random() * maxY)
|
||||
}
|
||||
|
||||
function lerpColor(a: number, b: number, t: number) {
|
||||
const red = lerp(a >> 16, b >> 16, t)
|
||||
const green = lerp((a >> 8) & 0xff, (b >> 8) & 0xff, t)
|
||||
const blue = lerp(a & 0xff, b & 0xff, t)
|
||||
return (red << 16) | (green << 8) | blue
|
||||
}
|
||||
|
||||
function lerp(a: number, b: number, t: number) {
|
||||
return (1-t)*a + b*t
|
||||
}
|
||||
|
||||
function init() {
|
||||
const canvas = document.getElementById("game-canvas") as HTMLCanvasElement | null;
|
||||
if (!canvas) throw new Error("unable to get canvas HTML element");
|
||||
const ctx = canvas.getContext("2d") as CanvasRenderingContext2D | null;
|
||||
if (!ctx) throw new Error("unable to get canvas 2D context");
|
||||
|
||||
apple = getRandomPos(canvas.width, canvas.height)
|
||||
resizeCanvas(ctx);
|
||||
|
||||
canvas.onmousemove = () => {};
|
||||
|
||||
canvas.onclick = () => {};
|
||||
|
||||
window.onkeydown = (evt) => {
|
||||
let new_direction: Vec2d | undefined;
|
||||
switch (evt.key) {
|
||||
case "z": new_direction = new Vec2d(0, -1); break;
|
||||
case "s": new_direction = new Vec2d(0, 1); break;
|
||||
case "q": new_direction = new Vec2d(-1, 0); break;
|
||||
case "d": new_direction = new Vec2d(1, 0); break;
|
||||
case "j": interpolation_factor++; break;
|
||||
case "k": interpolation_factor = Math.max(1, interpolation_factor-1); break;
|
||||
}
|
||||
console.log(`interpolation_factor: ${interpolation_factor}`)
|
||||
if (!new_direction) return;
|
||||
if (new_direction.x === -velocity.x && new_direction.y === -velocity.y) return; // no 180° turns
|
||||
if (new_direction.x === velocity.x && new_direction.y === velocity.y) return; // no 180° turns
|
||||
velocity = new_direction;
|
||||
};
|
||||
|
||||
window.requestAnimationFrame((t) => update(ctx, t));
|
||||
}
|
||||
|
||||
init();
|
||||
Reference in New Issue
Block a user