將HTML5 Canvas的內(nèi)容保存為圖片借助toDataURL實(shí)現(xiàn)

2024-08-26 00:15:59

字體：大中小

供稿：網(wǎng)友

點(diǎn)評(píng)：將HTML5 Canvas的內(nèi)容保存為圖片主要思想是借助Canvas自己的API - toDataURL()來(lái)實(shí)現(xiàn)，具體實(shí)現(xiàn)如下，感興趣的朋友可以參考下哈，希望對(duì)你有所幫助

主要思想是借助Canvas自己的API - toDataURL()來(lái)實(shí)現(xiàn)，整個(gè)實(shí)現(xiàn)
HTML + JavaScript的代碼很簡(jiǎn)單。

復(fù)制代碼

代碼如下:

<html>
<meta http-equiv="X-UA-Compatible" content="chrome=1">
<head>
<script>
window.onload = function() {
draw();
var saveButton = document.getElementById("saveImageBtn");
bindButtonEvent(saveButton, "click", saveImageInfo);
var dlButton = document.getElementById("downloadImageBtn");
bindButtonEvent(dlButton, "click", saveAsLocalImage);
};
function draw(){
var canvas = document.getElementById("thecanvas");
var ctx = canvas.getContext("2d");
ctx.fillStyle = "rgba(125, 46, 138, 0.5)";
ctx.fillRect(25,25,100,100);
ctx.fillStyle = "rgba( 0, 146, 38, 0.5)";
ctx.fillRect(58, 74, 125, 100);
ctx.fillStyle = "rgba( 0, 0, 0, 1)"; // black color
ctx.fillText("Gloomyfish - Demo", 50, 50);
}
function bindButtonEvent(element, type, handler)
{
if(element.addEventListener) {
element.addEventListener(type, handler, false);
} else {
element.attachEvent('on'+type, handler);
}
}
function saveImageInfo ()
{
var mycanvas = document.getElementById("thecanvas");
var image = mycanvas.toDataURL("image/png");
var w=window.open('about:blank','image from canvas');
w.document.write("<img src='"+image+"' />