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This article introduces the relevant knowledge of "how to achieve HTML5 Canvas rotation animation". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Effect picture:

Method 1:

The code is as follows:

Your browser does not support the canvas tag

Var deg = 0

Var r = 30

Var rl = 100

Function drawTaiji () {

Var canvas = document.getElementById ('myCanvas')

Var context = canvas.getContext ('2d')

Var colorA = "rgb (0,0,0)"

Var colorB = "red"

Var px = Math.sin (deg) * r

Var py = Math.cos (deg) * r

Context.clearRect (0,0,300,300)

Context.beginPath ()

Context.fillStyle = colorA

Context.arc (rl, rl, 60,0.5 * Math.PI + deg, 1.5 * Math.PI + deg, true)

Context.closePath ()

Context.fill ()

Context.fillStyle = colorB

Context.beginPath ()

Context.arc (rl, rl, 60,1.5 * Math.PI + deg, 0.5 * Math.PI + deg, true)

Context.closePath ()

Context.fill ()

Context.fillStyle = colorB

Context.beginPath ()

Context.arc (rl+px, rl-py, 30,0.5 * Math.PI + deg, 1.5 * Math.PI + deg, true)

Context.closePath ()

Context.fill ()

Context.fillStyle = colorA

Context.beginPath ()

Context.arc (rl-px, rl+py, 30,1.5 * Math.PI + deg, 0.5 * Math.PI + deg, true)

Context.closePath ()

Context.fill ()

Context.fillStyle = colorA

Context.beginPath ()

Context.arc (rl+px, rl-py, 8, 0, 2 * Math.PI, true)

Context.closePath ()

Context.fill ()

Context.fillStyle = colorB

Context.beginPath ()

Context.arc (rl-px, rl+py, 8, 0, 2 * Math.PI, true)

Context.closePath ()

Context.fill ()

Deg + = 0.1

}

SetInterval (drawTaiji, 100)

Method 2:

The code is as follows:

Your browser does not support the canvas tag

Var canvas = document.getElementById ('myCanvas')

Var ctx = canvas.getContext ("2d")

Var angle = 0

Var count = 360

Var clrA ='# 000'

Var clrB = 'red'

Function taiji (x, y, radius, angle, wise) {

Angleangle = angle | | 0

Wisewise = wise? 1:-1

Ctx.save ()

Ctx.translate (x, y)

Ctx.rotate (angle)

Ctx.fillStyle = clrA

Ctx.beginPath ()

Ctx.arc (0,0, radius, 0, Math.PI, true)

Ctx.fill ()

Ctx.beginPath ()

Ctx.fillStyle = clrB

Ctx.arc (0,0, radius, 0, Math.PI, false)

Ctx.fill ()

Ctx.fillStyle = clrB

Ctx.beginPath ()

Ctx.arc (wise *-0.5 * radius, 0, radius / 2,0, Math.PI * 2, true)

Ctx.fill ()

Ctx.beginPath ()

Ctx.fillStyle = clrA

Ctx.arc (wise * + 0.5 * radius, 0, radius / 2,0, Math.PI * 2, false)

Ctx.arc (wise *-0.5 * radius, 0, radius / 10,0, Math.PI * 2, true)

Ctx.fill ()

Ctx.beginPath ()

Ctx.fillStyle = clrB

Ctx.arc (wise * + 0.5 * radius, 0, radius / 10,0, Math.PI * 2, true)

Ctx.fill ()

Ctx.restore ()

}

Loop = setInterval (function () {

BeginTag = true

Ctx.clearRect (0,0, canvas.width, canvas.height)

Taiji (200,200,50, Math.PI * (angle / count) * 2, true)

/ taiji (350,350,50, Math.PI * ((count-angle) / count) * 2, false)

Angle = (angle + 5)% count

}, 50)

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