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script.js
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const canvas = document.getElementById("game")
const ctx = canvas.getContext("2d");
const width = 640
const height = 480
function lerp(a, b, alpha) {
return a + alpha * ( b - a )
}
const server_ip = document.getElementById("server-ip")
const server_nick = document.getElementById("server-nick")
const connect_server = document.getElementById("connect-server")
const server_error = document.getElementById("server-error")
const allowed_key_to_send = [
"KeyR", "KeyW", "KeyE", "KeyQ", "KeyS",
"Numpad1", "Numpad2", "Numpad3", "Numpad4", "Numpad5",
"Numpad6", "Numpad7", "Numpad8", "Numpad9", "Numpad0",
"ShiftLeft", "ControlLeft", "Enter",
"F1", "F2", "KeyZ", "KeyX", "KeyC"
]
connect_server.onclick = () => {
let ip = server_ip.value
let nick = server_nick.value
server_error.innerText = ""
if (ip.length == 0) {
server_error.innerText = "введите айпи пж"
return
}
if (nick.length == 0) {
server_error.innerText = "введите ник пж"
return
}
if (!ip.includes(":")) {
ip += ":8000"
}
if (typeof player.socket !== "undefined") {
player.socket.close()
}
player.on_connect(nick)
blocks = []
try {
let socket = new WebSocket(
"ws://"+ip,
"cubic",
)
socket.onopen = e => {
socket.send("J"+nick);
player.socket = socket
}
socket.onmessage = e => {
player.recv_packet(e.data)
}
socket.onclose = e => {
player.socket = undefined
reset_world()
}
socket.onerror = () => {
server_error.innerText = "Connection closed due to error"
reset_world()
}
} catch (exception) {
server_error.innerText = exception
}
}
function wrapText(ctx, text, maxWidth) {
const lines = [];
let currentLine = '';
for (let i = 0; i < text.length; i++) {
const char = text[i];
const testLine = currentLine + char;
const testWidth = ctx.measureText(testLine).width;
if (testWidth > maxWidth && currentLine) {
lines.push(currentLine);
currentLine = char;
} else {
currentLine = testLine;
}
}
if (currentLine) {
lines.push(currentLine);
}
return lines;
}
var ticksAlive = 0
var debugMode = false
var camera = {
x: 0.0,
y: 0.0,
size: 1.5
}
var chatOpened = false
var chatMessages = []
var chatTyping = ""
class Block {
constructor(x, y, color, collides, type) {
this.x = x
this.y = y
this.color = color
this.collides = collides
this.type = type
}
render() {
let rect = this.translate_to_camera()
if (this.is_need_render(rect)) {
ctx.fillStyle = this.color
ctx.fillRect(...rect)
}
}
is_need_render(rect) {
return rect[0] + rect[2] > 0 || rect[1] + rect[3] > 0 || rect[0] < width || rect[1] < height
}
translate_to_camera() {
let size = camera.size * 16
return [
this.x * size - size / 2 + (width / 2 - camera.x * size),
height - (this.y + 1) * size + size / 2 - (height / 2 - camera.y * size),
size,
size
]
}
tick() {
}
tick_render() {
}
on_collide(player, x, y) {
if (x != 0) player.velocity_x = this.x + x - player.x
if (y != 0) player.velocity_y = this.y + y - player.y
}
text_render() {
}
}
class Player extends Block {
constructor(x, y, name, color, velocity_x, velocity_y) {
super(x, y, color, true, null)
this.velocity_x = velocity_x
this.velocity_y = velocity_y
this.name = name
}
on_collide(player, x, y) {
super.on_collide(player, x, y)
// if (x != 0) {
// player.vel_x *= 0.5
// this.vel_x = player.vel_x
// }
// if (y != 0) {
// player.vel_y *= 0.5
// this.vel_y = player.vel_y
// }
}
tick(collide=true) {
this.x = Math.round(this.x * 100) / 100
this.y = Math.round(this.y * 100) / 100
this.velocity_x = Math.round(this.velocity_x * 100) / 100
this.velocity_y = Math.round(this.velocity_y * 100) / 100
if (collide) this.collide()
}
collide() {
this.on_ground = false
for (const block of blocks) {
if (!block.collides) continue
let collide_x = 0
let collide_y = 0
if (this.x > block.x-1 && this.x < block.x+1) {
if (this.y > block.y && this.y + this.velocity_y - 1 < block.y) {
this.on_ground = true
collide_y = 1
}
if (this.y < block.y && this.y + this.velocity_y > block.y - 1) collide_y = -1
}
if (this.y > block.y-1 && this.y < block.y+1) {
if (this.x > block.x && this.x + this.velocity_x - 1 < block.x) collide_x = 1
if (this.x < block.x && this.x + this.velocity_x > block.x - 1) collide_x = -1
}
block.on_collide(this, collide_x, collide_y)
}
}
tick_render() {
this.velocity_x *= 0.5
this.velocity_y *= 0.5
this.x += this.velocity_x
this.y += this.velocity_y
}
text_render() {
super.text_render()
let rect = this.translate_to_camera()
if (this.is_need_render(rect)) {
ctx.fillStyle = "#ddd"
ctx.font = "15px monospace";
let width = ctx.measureText(this.name).width
ctx.fillText(this.name,rect[0]+rect[2]/2-width/2, rect[1]-5);
}
}
teleport(x, y) {
this.velocity_x = x - this.x
this.velocity_y = y - this.y
}
force_teleport(x, y) {
this.x = x
this.y = y
this.velocity_x = 0
this.velocity_y = 0
}
}
class MainPlayer extends Player {
constructor() {
super(0.0, 0.0, "unnamed player", "#5e6", 0, 0)
this.init()
this.socket = undefined
}
init() {
this.walk_speed = 1
this.jump_speed = 2
this.gravity_speed = 0.5
this.controls_x = 0
this.controls_jump = 0
this.on_ground = false
this.block_type = null
this.all_block_types = [
"normal", "normal", "normal", "normal", "normal",
"normal", "normal", "normal", "normal", "normal"
]
this.ping = -1
}
on_connect(name) {
this.x = 0.0
this.y = 0.0
this.velocity_x = 0.0
this.velocity_y = 0.0
camera.x = 0.0
camera.y = 0.0
chatOpened = false
chatMessages = []
this.name = name
this.color = "#5e6"
this.init()
}
register() {
document.addEventListener("keydown", (e) => {
let key = e.code
if (chatOpened) {
if (key == "Backspace") {
chatTyping = chatTyping.slice(0, chatTyping.length-1)
} else if (key == "Enter") {
if (chatTyping == "") {
chatOpened = false
return
}
this.send_packet("M", chatTyping)
chatTyping = ""
chatOpened = false
} else if (key == "Escape") {
chatOpened = false
} else if (e.key.length == 1) {
chatTyping += e.key
e.preventDefault()
return false
}
} else {
if (key == "KeyD") {
this.controls_x = 1
} else if (key == "KeyA") {
this.controls_x = -1
} else if (key == "Space") {
this.controls_jump = true
e.preventDefault()
return false
} else if (key == "KeyR") {
if (typeof this.socket === "undefined") {
this.force_teleport(0, 1)
}
} else if (key == "KeyT") {
chatOpened = true
}
if (e.key == "0") this.block_type = null
if ("123456789".includes(e.key)) this.block_type = this.all_block_types[parseInt(e.key)-1]
if (allowed_key_to_send.includes(key)) {
this.send_packet("K",key,"1")
}
if (key == "Escape") {
if (typeof this.socket !== "undefined") {
this.socket.close()
}
}
}
if (key == "F3") {
debugMode = !debugMode
e.preventDefault()
return false
}
})
document.addEventListener("keyup", (e) => {
let key = e.code
if ((key == "KeyD" && this.controls_x == 1)
|| (key == "KeyA" && this.controls_x == -1)) {
this.controls_x = 0
} else if (key == "Space" && this.controls_jump) {
this.controls_jump = false
}
if (allowed_key_to_send.includes(key)) {
this.send_packet("K",key,"0")
}
})
canvas.addEventListener("wheel", e => {
if (e.deltaY > 0) {
camera.size *= 0.5 * (e.deltaY/114)
} else {
camera.size *= 2 * (e.deltaY/-114)
}
e.preventDefault()
return false
})
canvas.addEventListener("mousedown", e => {
let rect = canvas.getBoundingClientRect()
let size = 16 * camera.size
let x = Math.round((e.clientX - rect.x) / size - (width / size / 2) + camera.x)
let y = Math.round((height - (e.clientY - rect.y)) / size - (height / size / 2) + camera.y)
if (e.buttons == 2 && this.block_type != null) {
if (typeof this.socket === "undefined") {
placeBlock(new Block(x,y,"#555",true,this.block_type))
}
this.send_packet("P",x,y,this.block_type)
} else if (e.buttons == 1) {
if (typeof this.socket === "undefined") {
removeBlock(x, y)
}
this.send_packet("D",x,y)
}
})
}
recv_packet(packet) {
let packet_id = packet[0]
let packet_data = packet.slice(1).split("\n")
console.log(packet_id, packet_data)
// console.log(packet_id, packet_data)
if (packet_id == "K") {
server_error.innerText = packet_data[0]
this.socket.close()
this.socket = null
}
if (packet_id == "N") {
this.name = packet_data[0]
}
if (packet_id == "C") {
this.color = packet_data[0]
}
if (packet_id == "M") {
chatMessages.unshift(...packet_data)
}
if (packet_id == "R") {
this.velocity_x = parseFloat(packet_data[0]) - this.x + parseFloat(packet_data[2])
this.velocity_y = parseFloat(packet_data[1]) - this.y + parseFloat(packet_data[3])
}
if (packet_id == "P") {
let x = parseFloat(packet_data[0])
let y = parseFloat(packet_data[1])
this.x = x
this.y = y
}
if (packet_id == "V") {
let x = parseFloat(packet_data[0])
let y = parseFloat(packet_data[1])
this.velocity_x = x
this.velocity_y = y
}
if (packet_id == "S") {
let speed_type = packet_data[0]
let speed = parseFloat(packet_data[1])
if (speed_type == "W") {
this.walk_speed = speed
} else if (speed_type == "J") {
this.jump_speed = speed
} else if (speed_type == "G") {
this.gravity_speed = speed
}
}
if (packet_id == "W") {
for (const data of packet_data) {
let type = data[0]
let create = data[1] == "1"
let params = data.slice(2).split(",")
if (type == "B") {
let x = parseFloat(params[0])
let y = parseFloat(params[1])
if (create) {
let collides = params[2] == "1"
let type = params[3]
let color = params[4]
let block = getBlock(x, y)
if (block != null) {
block.x = x
block.y = y
block.color = color
block.collides = collides
block.type = type
} else {
placeBlock(new Block(x,y,color,collides,type))
}
} else {
removeBlock(x, y)
}
} else if (type == "P") {
let name = params[0]
if (create) {
let x = parseFloat(params[1])
let y = parseFloat(params[2])
let vel_x = parseFloat(params[3])
let vel_y = parseFloat(params[4])
let color = params[5]
let player = getPlayer(name)
if (player != null) {
player.x = x
player.y = y
player.color = color
player.velocity_x = vel_x
player.velocity_y = vel_y
} else {
placeBlock(new Player(x,y,name,color,vel_x,vel_y))
}
} else {
removePlayer(name)
}
}
}
}
if (packet_id == "B") {
this.all_block_types = packet_data.slice(0, 9)
this.block_type = null
}
}
send_packet(id, ...params) {
if (typeof this.socket === "undefined") {
return
}
this.socket.send(id+params.join("\n"))
}
send_velocity_packet(x, y) {
if (x == 0 && y == 0) return
this.send_packet("V", x, y)
}
tick() {
super.tick(false)
let vel_x = this.velocity_x
let vel_y = this.velocity_y
this.velocity_x += this.controls_x * this.walk_speed
if (this.controls_jump && this.on_ground) {
this.velocity_y += this.jump_speed
this.on_ground = false
} else {
this.velocity_y -= this.gravity_speed
}
this.collide()
ticksAlive++
this.send_velocity_packet(this.velocity_x-vel_x, this.velocity_y-vel_y)
}
render() {
super.render()
camera.x = Math.round(lerp(camera.x, this.x, 0.075) * 1000) / 1000
camera.y = Math.round(lerp(camera.y, this.y, 0.075) * 1000) / 1000
}
text_render() {
super.text_render()
if (this.block_type != null) {
ctx.fillStyle = "#76d"
ctx.font = "15px monospace";
ctx.fillText("selected: "+this.block_type, 0, 15);
}
if (debugMode) {
ctx.fillStyle = "#de7"
ctx.font = "20px monospace";
ctx.fillText("x: "+this.x, 0, 20);
ctx.fillText("y: "+this.y, 0, 40);
ctx.fillText("velocity_x: "+this.velocity_x, 0, 60);
ctx.fillText("velocity_y: "+this.velocity_y, 0, 80);
ctx.fillText("camera.x: "+camera.x, 0, 100);
ctx.fillText("camera.y: "+camera.y, 0, 120);
}
if (!chatOpened) {
ctx.fillStyle = "#22222288"
ctx.fillRect(5, height - 35, width * 0.4, 30)
ctx.fillStyle = "#aaaaaa88"
ctx.font = "15px monospace";
ctx.fillText("Нажмите T для чата", 15, height - 15);
} else {
ctx.fillStyle = "#22222288"
ctx.fillRect(5, height - 35, width -10, 30)
ctx.save();
ctx.beginPath();
ctx.moveTo(5, height - 35);
ctx.lineTo(width - 5 , height - 35);
ctx.lineTo(width - 5, height - 5);
ctx.lineTo(5, height - 5);
ctx.lineTo(5, height - 35);
ctx.closePath();
ctx.clip();
ctx.font = "15px monospace"
if (chatTyping.length == 0) {
ctx.fillStyle = "#aaaaaa88"
ctx.fillText("Напишите сообщение...", 15, height - 15);
} else {
ctx.fillStyle = "#ffffff"
let text_width = ctx.measureText(chatTyping).width
ctx.fillText(chatTyping, Math.min(10, width - text_width - 10), height - 15)
}
ctx.restore();
}
if (chatMessages.length > 0) {
let draw_message = (message) => {
let lines = wrapText(ctx, message, message_width - 20)
let height = lines.length * 20 + 5 + 5
let top = message_bottom - height
ctx.fillStyle = "#22222288"
ctx.fillRect(5, top, message_width, height)
let y = 5
for (let line of lines) {
ctx.fillStyle = "#ffffff"
ctx.fillText(line, 15, top+y+15);
y += 5 + 20
}
message_bottom -= height + 5
}
let message_width = width * 0.4
let message_bottom = height - 35 - 5
if (chatOpened) {
chatMessages.forEach(draw_message)
} else {
draw_message(chatMessages[0])
}
}
}
}
var player = new MainPlayer()
player.register()
var blocks = []
blocks.push(new Block(-1, -1, "#555", true));
blocks.push(new Block(0, -1, "#a67", true));
blocks.push(new Block(1, -1, "#555", true));
function reset_world() {
player.on_connect("unnamed player")
blocks = []
blocks.push(new Block(-1, -1, "#555", true));
blocks.push(new Block(0, -1, "#a67", true));
blocks.push(new Block(1, -1, "#555", true));
}
function getBlock(x, y) {
let value = blocks.find(o => !(o instanceof Player) && o.x == x && o.y == y)
if (typeof value === "undefined") {
return null
} else {
return value
}
}
function placeBlock(block) {
blocks.push(block);
}
function removeBlock(x, y) {
blocks = blocks.filter(o => o instanceof Player || o.x != x || o.y != y)
}
function getPlayer(name) {
let value = blocks.find(o => o instanceof Player && o.name == name)
if (typeof value === "undefined") {
return null
} else {
return value
}
}
function removePlayer(name) {
blocks = blocks.filter(o => !(o instanceof Player) || o.name != name)
}
setInterval(() => {
for (const block of blocks)
block.tick()
player.tick()
}, 1000 / 20)
setInterval(() => {
for (const block of blocks)
block.tick_render()
player.tick_render()
}, 1000 / 60)
let renderTimer = () => {
ctx.fillStyle = "#333";
ctx.fillRect(0, 0, width, height);
for (const block of blocks)
block.render()
for (const block of blocks)
block.text_render()
player.render()
player.text_render()
requestAnimationFrame(renderTimer)
}
requestAnimationFrame(renderTimer)