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index.html
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<!DOCTYPE html>
<html>
<head>
<title>Raycaster</title>
</head>
<body>
<div>
<canvas id="screen">
</div>
<div>
<canvas id="canvas">
</div>
<div id="info">
<div id="FPS"></div>
<div id="xPos"></div>
<div id="yPos"></div>
<div id="rot"></div>
<div id="numRays"></div>
</div>
<script type="text/javascript">
window.onload = function() {
const app = new App
lastTime = Date.now()
setInterval(app.gameLoop, 1000/30)
}
class App {
constructor() {
this.canvas = new Canvas
this.screen = new Screen
this.player = this.canvas.player
this.frameTime
this.lastTime = Date.now()
document.addEventListener('keyup', this.handleUp.bind(this))
document.addEventListener('keydown', this.handleDown.bind(this))
this.gameLoop = this.gameLoop.bind(this)
}
handleDown(event) {
event.preventDefault()
switch (event.keyCode) {
case 87:
this.player.speed = 1
break
case 83:
this.player.speed = -1
break
case 65:
this.player.dir = -1
break
case 68:
this.player.dir = 1
break
case 82:
this.player.toggleRotate()
case 16:
this.player.running()
break
}
}
handleUp(event) {
event.preventDefault()
if (event.keyCode === 38 || event.keyCode === 40 || event.keyCode === 87 || event.keyCode === 83) {
this.player.speed = 0
} else if (event.keyCode === 37 || event.keyCode === 39 || event.keyCode === 65 || event.keyCode === 68) {
this.player.dir = 0
} else if (event.keyCode === 16) {
this.player.walking()
}
}
gameLoop() {
this.canvas.render()
this.screen.render(this.player, this.canvas)
this.logTime()
this.renderInfo()
}
logTime() {
let currTime = Date.now()
this.frameTime = (currTime - this.lastTime)
this.lastTime = currTime
}
renderInfo() {
this.screen.stx.font = '16px serif'
this.screen.stx.fillStyle = "black"
let degrees = (this.player.rot * (180/Math.PI)) % 360
this.screen.stx.fillText("FPS: " + this.frameTime, 5, 16)
this.screen.stx.fillText("xPos: " + Math.round(this.player.x * 100) / 100, 5, 32)
this.screen.stx.fillText("yPos: " + Math.round(this.player.y * 100) / 100, 5, 48)
this.screen.stx.fillText("rot: " + Math.round(degrees * 100) / 100 + '°', 5, 64)
this.screen.stx.fillText("numRays: " + this.player.numRays, 5, 80)
}
}
class Canvas {
constructor() {
this.canvas = document.getElementById('canvas')
this.ctx = this.canvas.getContext('2d')
this.matrix = ([
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
[1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],
[1, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],
[1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 0, 1],
[1, 0, 0, 0, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 1],
[1, 0, 0, 0, 2, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],
[1, 0, 0, 0, 2, 0, 0, 2, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 1],
[1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 1],
[1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],
[1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 1],
[1, 2, 2, 2, 2, 0, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],
[1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],
[1, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],
[1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],
[1, 0, 2, 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],
[1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 1],
[1, 0, 2, 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 1],
[1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 2, 0, 1],
[1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1],
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
])
this.mapDim = this.matrix[0].length
this.scale = 10
this.pixelSize = this.mapDim * this.scale
this.canvas.width = this.pixelSize
this.canvas.height = this.pixelSize
this.player = new Player(this)
}
drawMap() {
for (let y = 0; y < this.mapDim; y++) {
for (let x = 0; x < this.mapDim; x++) {
switch (this.matrix[y][x]) {
case 1:
this.ctx.fillStyle = "black"
this.ctx.fillRect(x * this.scale, y * this.scale, this.scale, this.scale)
break
case 2:
this.ctx.fillStyle = "grey"
this.ctx.fillRect(x * this.scale, y * this.scale, this.scale, this.scale)
break
}
}
}
}
render() {
this.ctx.clearRect(0, 0, this.pixelSize, this.pixelSize)
this.drawMap()
this.player.render()
}
}
class Player {
constructor(canvas) {
this.canvas = canvas
this.scale = canvas.scale
this.pixelSize = canvas.pixelSize
this.ctx = canvas.ctx
this.matrix = canvas.matrix
this.mapDim = canvas.mapDim
this.x = 12.5
this.y = 9.5
this.dir = 0
this.rot = 0
this.rotate = false
this.size = this.scale / 4
this.speed = 0
this.moveSpeed = 0.07
this.rotSpeed = 3.5 * Math.PI / 180
;
this.stripWidth = .05
this.fov = 80 * (Math.PI / 180)
this.numRays = Math.ceil(this.pixelSize / this.stripWidth)
this.viewDist = (this.pixelSize / 2) / Math.tan(this.fov / 2)
this.rays = []
}
running() {
this.moveSpeed = 0.12
}
walking() {
this.moveSpeed = 0.05
}
toggleRotate() {
this.rotate = !this.rotate
}
checkCollision(xx, yy){
if (xx < 0 || xx > this.mapDim || yy < 0 || yy > this.mapDim) {
return
}
if (this.matrix[Math.floor(yy + this.size/this.scale)][Math.floor(xx + this.size/this.scale)] !== 0 || this.matrix[Math.floor(yy)][Math.floor(xx)] !== 0) {
return
}
if(this.rotate) { this.rot += 1 * .005 }
this.x = xx
this.y = yy
}
castRays() {
this.rays = []
for (let i = 0; i < this.numRays; i++) {
this.rays.push(new Ray(this, i))
}
}
render() {
this.ctx.fillStyle = "red"
this.ctx.fillRect(this.x * this.scale, this.y * this.scale, this.size, this.size)
let step = this.speed * this.moveSpeed
this.rot += (this.dir * this.rotSpeed)
let xx = this.x + Math.cos(this.rot) * step
let yy = this.y + Math.sin(this.rot) * step
this.checkCollision(xx, yy)
this.castRays()
}
}
class Ray {
constructor(player, idx) {
this.player = player
this.scale = player.scale
this.size = player.size
this.ctx = player.ctx
this.mapDim = player.mapDim
this.matrix = player.matrix
this.screenPos = (-this.player.numRays / 2 + idx) * this.player.stripWidth
this.viewDist = Math.sqrt(Math.pow(this.screenPos, 2) + Math.pow(this.player.viewDist, 2))
this.angle = Math.asin(this.screenPos / this.viewDist)
this.xHit = 0
this.yHit = 0
this.dist = 0
this.block = null
this.cast(this.player.rot + this.angle)
}
cast(ang) {
let angMod = ang % (Math.PI * 2)
const angle = angMod < 0 ? angMod + Math.PI * 2 : angMod
const right = angle > Math.PI * 2 * 0.75 || angle < Math.PI * 2 * 0.25
const up = angle > Math.PI
this.checkHoriz(angle, right)
this.checkVert(angle, up)
this.draw(this.xHit, this.yHit)
}
checkHoriz(angle, right) {
const slope = Math.sin(angle) / Math.cos(angle)
const dx = right ? 1 : -1
const dy = dx * slope
let x = right ? Math.ceil(this.player.x) : Math.floor(this.player.x)
let y = this.player.y + (x - this.player.x) * slope
while (x >= 0 && x < this.mapDim && y >= 0 && y < this.mapDim) {
let mapX = x + (right ? 0 : -1)
let mapY = Math.floor(y)
if (this.matrix[mapY][mapX] !== 0) {
this.block = this.matrix[mapY][mapX]
this.dist = (Math.pow(x - this.player.x, 2) + Math.pow(y - this.player.y, 2))
this.xHit = x
this.yHit = y
break
}
x += dx
y += dy
}
}
checkVert(angle, up) {
const slope = Math.cos(angle) / Math.sin(angle)
const dy = up ? -1 : 1
const dx = dy * slope
let y = up ? Math.floor(this.player.y) : Math.ceil(this.player.y)
let x = this.player.x + (y - this.player.y) * slope
while (x >= 0 && x < this.mapDim && y >= 0 && y < this.mapDim) {
let mapY = y + (up ? -1 : 0)
let mapX = Math.floor(x)
if (this.matrix[mapY][mapX] !== 0) {
let dist = Math.pow(x - this.player.x, 2) + Math.pow(y - this.player.y, 2)
if (!this.dist || dist < this.dist) {
this.block = this.matrix[mapY][mapX]
this.dist = dist
this.xHit = x
this.yHit = y
}
break
}
x += dx
y += dy
}
}
draw(x, y) {
this.ctx.strokeStyle = 'green'
this.ctx.beginPath()
this.ctx.moveTo(this.player.x * this.scale + this.size / 2 , this.player.y * this.scale + this.size/2)
this.ctx.lineTo(x * this.scale, y * this.scale)
this.ctx.closePath()
this.ctx.stroke()
}
}
class Screen {
constructor() {
this.screen = document.getElementById('screen')
this.stx = this.screen.getContext('2d')
this.screen.width = 1200
this.screen.height = 800
this.width = this.screen.width
this.height = this.screen.height
this.minDist = 1
this.rayNum = null
this.sliceWidth = null
}
colHeight(dist, angle) {
if (dist <= this.minDist) {
return this.height
} else {
return this.height / (Math.sqrt(dist) * Math.cos(angle))
}
}
color(ray) {
var r_a = (Math.sqrt(ray.dist) * 18) / 100
if (r_a > 1) r_a = 1
if (r_a < .1) r_a = .1
switch (ray.block) {
case 1:
return `rgba(100,100,100,${r_a})`
break
case 2:
return `rgba(0, 80, 80, ${r_a})`
break
}
}
drawSky() {
var my_gradient = this.stx.createLinearGradient(0,0,0,this.height/2)
my_gradient.addColorStop(0,"#ADD8E6")
my_gradient.addColorStop(1,"white")
this.stx.fillStyle = my_gradient
this.stx.fillRect(0,0,this.width,this.height/2)
}
render(player, canvas) {
this.rayNum = player.rays.length
this.sliceWidth = this.width / this.rayNum
this.stx.clearRect(0, 0, this.width, this.height)
this.drawSky()
player.rays.forEach((ray, idx) => this.renderSlice(ray, idx))
}
renderSlice(ray, idx) {
const height = this.colHeight(ray.dist, ray.angle)
const startX = idx * this.sliceWidth
const startY = (this.height - height) / 2
const endX = this.sliceWidth
const endY = height
const color = this.color(ray)
this.stx.fillStyle = color
this.stx.fillRect(startX, startY, endX, endY)
}
}
</script>
</body>
</html>