html5通过canvas实现刮刮卡效果示例分享_html5教程技巧
修改img.src时涂层也会自动适应新图片的尺寸.
修改layer函数可更改涂层样式
以下是HTML源代码(已增加移动设备支持):
<script><br /> (function(bodyStyle) {<br /> bodyStyle.mozUserSelect = 'none';<br /> bodyStyle.webkitUserSelect = 'none';<br /> <br /> var img = new Image();<br /> var canvas = document.querySelector('canvas');<br /> canvas.style.backgroundColor='transparent';<br /> canvas.style.position = 'absolute';<br /> <br /> img.addEventListener('load', function(e) {<br /> var ctx;<br /> var w = img.width,<br /> h = img.height;<br /> var offsetX = canvas.offsetLeft,<br /> offsetY = canvas.offsetTop;<br /> var mousedown = false;<br /> <br /> function layer(ctx) {<br /> ctx.fillStyle = 'gray';<br /> ctx.fillRect(0, 0, w, h);<br /> }<br /> <br /> function eventDown(e){<br /> e.preventDefault();<br /> mousedown=true;<br /> }<br /> <br /> function eventUp(e){<br /> e.preventDefault();<br /> mousedown=false;<br /> }<br /> <br /> function eventMove(e){<br /> e.preventDefault();<br /> if(mousedown) {<br /> if(e.changedTouches){<br /> e=e.changedTouches[e.changedTouches.length-1];<br /> }<br /> var x = (e.clientX + document.body.scrollLeft || e.pageX) - offsetX || 0,<br /> y = (e.clientY + document.body.scrollTop || e.pageY) - offsetY || 0;<br /> with(ctx) {<br /> beginPath()<br /> arc(x, y, 5, 0, Math.PI * 2);<br /> fill();<br /> }<br /> }<br /> }<br /> <br /> canvas.width=w;<br /> canvas.height=h;<br /> canvas.style.backgroundImage='url('+img.src+')';<br /> ctx=canvas.getContext('2d');<br /> ctx.fillStyle='transparent';<br /> ctx.fillRect(0, 0, w, h);<br /> layer(ctx);<br /> <br /> ctx.globalCompositeOperation = 'destination-out';<br /> <br /> canvas.addEventListener('touchstart', eventDown);<br /> canvas.addEventListener('touchend', eventUp);<br /> canvas.addEventListener('touchmove', eventMove);<br /> canvas.addEventListener('mousedown', eventDown);<br /> canvas.addEventListener('mouseup', eventUp);<br /> canvas.addEventListener('mousemove', eventMove);<br /> });<br /> img.src = 'data:image/png;base64,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';<br /> })(document.body.style);<br /></script>
需要判断是否刮完时用这段代码替换原代码的eventUp事件处理函数:
e.preventDefault();
mousedown = false;
var data=ctx.getImageData(0,0,w,h).data;
for(var i=0,j=0;i
j++;
}
}
if(j alert('ok');
}
这段代码中的0.1是10%的意思,在涂层的面积小于等于10%时,就弹出窗口,表示刮完了,可以根据需求自行调整

Alat AI Hot

Undresser.AI Undress
Apl berkuasa AI untuk mencipta foto bogel yang realistik

AI Clothes Remover
Alat AI dalam talian untuk mengeluarkan pakaian daripada foto.

Undress AI Tool
Gambar buka pakaian secara percuma

Clothoff.io
Penyingkiran pakaian AI

AI Hentai Generator
Menjana ai hentai secara percuma.

Artikel Panas

Alat panas

Notepad++7.3.1
Editor kod yang mudah digunakan dan percuma

SublimeText3 versi Cina
Versi Cina, sangat mudah digunakan

Hantar Studio 13.0.1
Persekitaran pembangunan bersepadu PHP yang berkuasa

Dreamweaver CS6
Alat pembangunan web visual

SublimeText3 versi Mac
Perisian penyuntingan kod peringkat Tuhan (SublimeText3)

Topik panas



Panduan untuk Sempadan Jadual dalam HTML. Di sini kita membincangkan pelbagai cara untuk menentukan sempadan jadual dengan contoh Sempadan Jadual dalam HTML.

Ini ialah panduan untuk Nested Table dalam HTML. Di sini kita membincangkan cara membuat jadual dalam jadual bersama-sama dengan contoh masing-masing.

Panduan untuk HTML margin-kiri. Di sini kita membincangkan gambaran keseluruhan ringkas tentang HTML margin-left dan Contoh-contohnya bersama-sama dengan Pelaksanaan Kodnya.

Panduan untuk Susun Atur Jadual HTML. Di sini kita membincangkan Nilai Susun Atur Jadual HTML bersama-sama dengan contoh dan output n perincian.

Panduan kepada Senarai Tertib HTML. Di sini kami juga membincangkan pengenalan senarai dan jenis Tertib HTML bersama-sama dengan contoh mereka masing-masing

Panduan untuk Pemegang Tempat Input HTML. Di sini kita membincangkan Contoh Pemegang Tempat Input HTML bersama-sama dengan kod dan output.

Panduan untuk Memindahkan Teks dalam HTML. Di sini kita membincangkan pengenalan, cara teg marquee berfungsi dengan sintaks dan contoh untuk dilaksanakan.

Panduan untuk Butang onclick HTML. Di sini kita membincangkan pengenalan, kerja, contoh dan onclick Event masing-masing dalam pelbagai acara.
