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This article "HTML5 how to achieve gradient background picture and automatically download" article most people do not understand, so the editor summarized the following content, detailed, clear steps, with a certain reference value, I hope you can get something after reading this article, let's take a look at this "HTML5 how to achieve gradient background picture and automatically download" article it.

The code is as follows:

Html5 draws a gradual background picture and downloads it automatically

/ / step 1: get the canvas object

Var c = document.getElementById ("c")

/ / step 2: get the context object of the canvas object

Var context = c.getContext ("2d")

/ *

* these are other graphic codes for drawing.

Context.beginPath ()

Context.lineWidth=10

Context.strokeStyle= "red"

Context.moveTo (50 and 50)

Context.lineTo (150,50,50,500)

Context.stroke ()

Context.closePath ()

/ / context.strokeRect (220, 50, 50, 50, 50)

Context.fillStyle= "blue"

Context.fillRect (220, 50, 50, 50)

Context.beginPath ()

Context.arc (1501501501505050500pm Math.PIZUBUR 180RHUT 180mm Math.PICUBUP 180 false)

Context.lineTo (150150)

Context.closePath ()

Context.stroke ()

Context.lineWidth=1

Context.font= "50px Song style"

Context.fillText ("briup", 0220)

Context.save ()

Context.translate (50 and 50)

Context.rotate (90*Math.PI/180)

Context.beginPath ()

Context.lineWidth=10

Context.strokeStyle= "red"

Context.moveTo (0Pol 0)

Context.lineTo (100pi 0)

Context.stroke ()

Context.closePath ()

Context.restore ()

, /

Var g = context.createLinearGradient (0je 0penol 0200)

G.addColorStop (0, "90BFFF")

G.addColorStop (1, "white")

Context.fillStyle = g

Context.fillRect (0d01,1200)

_ window.location = c.toDataURL ("image/jpeg") .replace ("image/jpeg", "image/octet-stream")

The above is about "HTML5 how to achieve gradient background pictures and automatically download" the content of this article, I believe we all have a certain understanding, I hope the content shared by the editor will be helpful to you, if you want to know more related knowledge, please pay attention to the industry information channel.

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