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This article mainly introduces how to use html to make a dynamic fireworks, the article is very detailed, has a certain reference value, interested friends must finish!

Code structure

1. HTML code

Var ctx = document.querySelector ('canvas'). GetContext (' 2d')

Ctx.canvas.width = window.innerWidth

Ctx.canvas.height = window.innerHeight

Var sparks = []

Var fireworks = []

Var I = 20; while (iMurt -) {

Fireworks.push (

New Firework (Math.random () * window.innerWidth, window.innerHeight*Math.random ())

)

}

Render ()

Function render () {

SetTimeout (render, 1000 Universe 60)

Ctx.fillStyle = 'rgba (0,0,0,0.1)'

Ctx.fillRect (0,0, ctx.canvas.width, ctx.canvas.height)

For (var firework of fireworks) {

If (firework.dead) continue

Firework.move ()

Firework.draw ()

}

For (var spark of sparks) {

If (spark.dead) continue

Spark.move ()

Spark.draw ()

}

If (Math.random ()

< 0.05) { 　　fireworks.push(new Firework()) 　　} 　　} 　　function Spark(x, y, color) { 　　this.x = x 　　this.y = y 　　this.dir = Math.random() * (Math.PI*2) 　　this.dead = false 　　this.color = color 　　this.speed = Math.random() * 3 + 3; 　　this.walker = new Walker({ radius: 20, speed: 0.25 }) 　　this.gravity = 0.25 　　this.dur = this.speed / 0.1 　　this.move = function() { 　　this.dur-- 　　if(this.dur < 0) this.dead = true 　　if(this.speed < 0) return 　　if(this.speed >

0) this.speed-= 0.1

Var walk = this.walker.step ()

This.x + = Math.cos (this.dir + walk) * this.speed

This.y + = Math.sin (this.dir + walk) * this.speed

This.y + = this.gravity

This.gravity + = 0.05

}

This.draw = function () {

DrawCircle (this.x, this.y, 3, this.color)

}

}

Function Firework (x, y) {

This.xmove = new Walker ({radius: 10, speed: 0.5})

This.x = x | | Math.random () * ctx.canvas.width

This.y = y | | ctx.canvas.height

This.height = Math.random () * ctx.canvas.height/2

This.dead = false

This.color = randomColor ()

This.move = function () {

This.x + = this.xmove.step ()

If (this.y > this.height) this.y-= 1

Else this.burst ()

}

This.draw = function () {

DrawCircle (this.x, this.y, 1, this.color)

}

This.burst = function () {

This.dead = true

Var I = 100; while (iMurt -) sparks.push (new Spark (this.x, this.y, this.color))

}

}

Function drawCircle (x, y, radius, color) {

Color = color | |'# FFF'

Ctx.fillStyle = color

Ctx.fillRect (x-radius/2, y-radius/2, radius, radius)

}

Function randomColor () {

Return ['# 6ae5abe1'] [Math.floor (Math.random () * 5)]

}

Function Walker (options) {

This.step = function () {

This.direction = Math.sign (this.target) * this.speed

This.value + = this.direction

This.target

? This.target-= this.direction

: (this.value)

? (this.wander)

? This.target = this.newTarget ()

: this.target =-this.value

: this.target = this.newTarget ()

Return this.direction

}

This.newTarget = function () {

Return Math.round (Math.random () * (this.radius*2)-this.radius)

}

This.start = 0

This.value = 0

This.radius = options.radius

This.target = this.newTarget ()

This.direction = Math.sign (this.target)

This.wander = options.wander

This.speed = options.speed | | 1

}

The above is all the contents of the article "how to make a dynamic fireworks with html". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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