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mario.html
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mario.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>mario</title>
<style>
body {
position: relative;
width: 100%;
height: 100vh;
margin: 0;
background-color: #333;
}
#playground {
position: absolute;
left: 0;
right: 0;
top: 0;
bottom: 0;
margin: auto;
width: 800px;
height: 600px;
background-color: #81d9ff;
}
</style>
</head>
<body>
<canvas id="playground"></canvas>
<script>
/*
想法是，实现基本操作，并且能调整手感。已经有一个问题了，那些物理效果是放在全局好，还是放在操作实体上好？全都要|具体问题具体分析？——全局变量要不要再搞一个objects={}，像碰撞检测这种东西，会需要...嗯...
*/
// #region Constants
const GRAVITY = 0.5 // 重力加速度
const FRICTION = 0.8 // 摩擦系数
const RUN_MAX_SPEED = 10 // 最大跑动速度
const RUN_ACC = 1 // 跑动加速度
const RUN_DEC = 2 // 跑动减速度
const JUMP = 40 // 跳跃初速度
const FALL_MAX_SPEED = 20 // 最大下落速度
const STATES = ["idle", "run", "jump", "fall"]
// #endregion
// #region helpers
/*
class Vector2 {
constructor(x, y) {
this.x = x
this.y = y
}
add(v) {
return new Vector2(this.x + v.x, this.y + v.y)
}
sub(v) {
return new Vector2(this.x - v.x, this.y - v.y)
}
mul(v) {
return new Vector2(this.x * v.x, this.y * v.y)
}
length() {
return Math.sqrt(this.x * this.x + this.y * this.y)
}
normalize() {
let len = this.length()
return new Vector2(this.x / len, this.y / len)
}
}
*/
function Vector2(x, y) {
this.x = x
this.y = y
}
Vector2.prototype.add = function (v) {
return new Vector2(this.x + v.x, this.y + v.y)
}
Vector2.prototype.sub = function (v) {
return new Vector2(this.x - v.x, this.y - v.y)
}
Vector2.prototype.mul = function (v) {
return new Vector2(this.x * v.x, this.y * v.y)
}
// #endregion
// #region Variables
let position = new Vector2(0, 0)
let speed = new Vector2(0, 0)
let cameraAnchor = new Vector2(0, 0)
let objects = []
// #endregion
// #region Rendering
const playground = document.getElementById("playground")
const ctx = playground.getContext("2d")
const devicePixelRatio = 1
playground.width = playground.clientWidth * devicePixelRatio
playground.height = playground.clientHeight * devicePixelRatio
ctx.scale(devicePixelRatio, devicePixelRatio)
function render() {
ctx.clearRect(0, 0, playground.width, playground.height)
ctx.fillStyle = "#81d9ff"
ctx.fillRect(0, 0, playground.width, playground.height)
ctx.fillStyle = "#000000"
ctx.lineWidth = 1
ctx.strokeStyle = "#000000"
ctx.strokeRect(0 - cameraAnchor.x, 0 - cameraAnchor.y, 800, 600)
objects.forEach((obj) => {
ctx.fillRect(obj.position.x - cameraAnchor.x, obj.position.y - cameraAnchor.y, obj.size.x, obj.size.y)
})
}
// #endregion
// #region Updating
function update() {
applyMovement()
applyFriction()
applyCollision()
applyGravity()
applyCamera()
render()
// window.requestAnimationFrame(update)
}
// window.requestAnimationFrame(update)
let timer = setInterval(update, 1000 / 60)
// #endregion
// #region Controllers
/* 我在想这个 key 是不是应该放在 variables 那边... */
const key = {
left: false,
right: false,
up: false,
down: false,
/* 这两个的处理..也有点不一样，它只看按下的那一瞬，can jump can dash，然后在实行成功或被忽略后直接复位，不用管 keyup，另一个是，按键时间和组合问题... */
jump: false,
dash: false,
}
document.addEventListener("keydown", (e) => {
switch (e.key) {
case "ArrowLeft":
key.left = true
break
case "ArrowRight":
key.right = true
break
case "ArrowUp":
key.up = true
break
case "ArrowDown":
key.down = true
break
case "c":
if (e.repeat) break
key.jump = true
break
case "x":
if (e.repeat) break
key.dash = true
break
}
})
document.addEventListener("keyup", (e) => {
switch (e.key) {
case "ArrowLeft":
key.left = false
break
case "ArrowRight":
key.right = false
break
case "ArrowUp":
key.up = false
break
case "ArrowDown":
key.down = false
break
case "c":
// End the jump early if button released
key.jump = false
objects[0].speed.y = 0
break
}
})
if (window.DeviceOrientationEvent) {
window.addEventListener(
"deviceorientation",
function (event) {
const gamma = event.gamma
const beta = event.beta
if (gamma > 15) key.right = true
else if (gamma < -15) key.left = true
else {
key.right = false
key.left = false
}
},
false
)
window.addEventListener(
"touchstart",
function (event) {
key.jump = true
},
false
)
window.addEventListener(
"touchend",
function (event) {
key.jump = false
objects[0].speed.y = 0
},
false
)
}
// #endregion
// #region constructor
class RigidObject {
constructor(position, size) {
this.position = position
this.size = size
}
}
class Mario extends RigidObject {
constructor(position, size) {
super(position, size)
this.speed = new Vector2(0, 0)
this.state = STATES[0]
}
}
class Block extends RigidObject {
constructor(position, size) {
super(position, size)
}
}
// #endregion
// #region SetWorld
let mario = new Mario(new Vector2(0, 0), new Vector2(10, 10))
objects.push(mario)
for (let i = 0; i < 20; i++) {
objects.push(new Block(new Vector2((i - 1) * 20, i * 30), new Vector2(30, 10)))
}
// #endregion
// #region Physics & Movement
function applyGravity() {
if (mario.position.y + mario.size.y < playground.height) {
if (mario.speed.y < FALL_MAX_SPEED) {
mario.speed.y += GRAVITY * 0.1
} else {
mario.speed.y = FALL_MAX_SPEED
}
}
}
function applyMovement() {
if (key.left) {
mario.speed.x -= RUN_ACC * 0.05
}
if (key.right) {
mario.speed.x += RUN_ACC * 0.05
}
if (key.jump) {
mario.speed.y = -JUMP * 0.05
key.jump = false
}
if (key.dash) {
mario.speed.x *= 2
key.dash = false
}
mario.position = mario.position.add(mario.speed)
}
function applyFriction() {
if (mario.speed.x > 0) {
mario.speed.x -= FRICTION * 0.03
} else if (mario.speed.x < 0) {
mario.speed.x += FRICTION * 0.03
}
}
function applyCollision() {
// collision detection
objects.forEach((obj) => {
if (obj === mario) return
if (mario.position.x < obj.position.x + obj.size.x && mario.position.x + mario.size.x > obj.position.x && mario.position.y < obj.position.y + obj.size.y && mario.position.y + mario.size.y > obj.position.y) {
// collision detected!
let overlap = new Vector2(Math.min(mario.position.x + mario.size.x, obj.position.x + obj.size.x) - Math.max(mario.position.x, obj.position.x), Math.min(mario.position.y + mario.size.y, obj.position.y + obj.size.y) - Math.max(mario.position.y, obj.position.y))
if (overlap.x > overlap.y) {
// collision on y axis
if (mario.position.y < obj.position.y) {
// collision on top
mario.position.y -= overlap.y
mario.speed.y = 0
} else {
// collision on bottom
mario.position.y += overlap.y
mario.speed.y = 0
}
} else {
// collision on x axis
if (mario.position.x < obj.position.x) {
// collision on left
mario.position.x -= overlap.x
mario.speed.x = 0
} else {
// collision on right
mario.position.x += overlap.x
mario.speed.x = 0
}
}
}
})
// edge detection
if (mario.position.x < 0) {
mario.position.x = 0
mario.speed.x = 0
}
if (mario.position.x + mario.size.x > playground.width) {
mario.position.x = playground.width - mario.size.x
mario.speed.x = 0
}
if (mario.position.y < 0) {
mario.position.y = 0
mario.speed.y = 0
}
if (mario.position.y + mario.size.y > playground.height) {
mario.position.y = playground.height - mario.size.y
mario.speed.y = 0
}
}
function applyCamera() {
cameraAnchor = mario.position.add(new Vector2(-playground.width / 2, -playground.height / 2))
}
// #endregion
// #region States
// #endregion
</script>
</body>
</html>