How to use the tailoring method of clip () function in canvas
This article mainly shows you "how to use clip () function tailoring method in canvas", the content is easy to understand, clear, hope to help you solve your doubts, the following let Xiaobian lead you to study and learn "how to use clip () function clipping method in canvas" this article.
Draw a circle without cropping
* {margin:0;padding:0;}
Html,body {width:100%;height:100%;overflow:hidden;background-color:#AFAFAF;}
Varcanvas=document.getElementById ('canvas')
Context=canvas.getContext ('2d')
Canvas.width=document.body.clientWidth
Canvas.height=document.body.clientHeight
Context.lineWidth=3
Context.strokeStyle='red'
Context.beginPath ()
Context.arc (200 ~ 200 ~ 100, (Math.PI/180) * 0, (Math.PI/180) * 360 ~ ~ false)
Context.stroke ()
Context.closePath ()
Effect.
Use clip () to crop a region
* {margin:0;padding:0;}
Html,body {width:100%;height:100%;overflow:hidden;background-color:#AFAFAF;}
Varcanvas=document.getElementById ('canvas')
Context=canvas.getContext ('2d')
Canvas.width=document.body.clientWidth
Canvas.height=document.body.clientHeight
Context.lineWidth=3
Context.strokeStyle='red'
Context.rect (0Pol 0200200)
Context.clip ()
Context.beginPath ()
Context.arc (200 ~ 200 ~ 100, (Math.PI/180) * 0, (Math.PI/180) * 360 ~ ~ false)
Context.stroke ()
Context.closePath ()
Effect.
You can also use arc to draw a clipped area of a circle
* {margin:0;padding:0;}
Html,body {width:100%;height:100%;overflow:hidden;background-color:#AFAFAF;}
Varcanvas=document.getElementById ('canvas')
Context=canvas.getContext ('2d')
Canvas.width=document.body.clientWidth
Canvas.height=document.body.clientHeight
Context.lineWidth=3
Context.strokeStyle='red'
Context.arc (100, 100, 150, (Math.PI/180) * 0, (Math.PI/180) * 360, false)
Context.clip ()
Context.beginPath ()
Context.arc (200 ~ 200 ~ 100, (Math.PI/180) * 0, (Math.PI/180) * 360 ~ ~ false)
Context.stroke ()
Context.closePath ()
Effect.
Using save and restore to crop only a single path
* {margin:0;padding:0;}
Html,body {width:100%;height:100%;overflow:hidden;background-color:#AFAFAF;}
Varcanvas=document.getElementById ('canvas')
Context=canvas.getContext ('2d')
Canvas.width=document.body.clientWidth
Canvas.height=document.body.clientHeight
Context.lineWidth=3
Context.strokeStyle='red'
Context.save ()
Context.rect (0Pol 0200200)
Context.clip ()
Context.beginPath ()
Context.arc (200 ~ 200 ~ 100, (Math.PI/180) * 0, (Math.PI/180) * 360 ~ ~ false)
Context.stroke ()
Context.closePath ()
Context.restore ()
Context.beginPath ()
Context.arc (250, 250, 250, 100, (Math.PI/180) * 0, (Math.PI/180) * 360, false)
Context.stroke ()
Context.closePath ()
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