Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
1.1k views
in Technique[技术] by (71.8m points)

canvas 怎么实现为ajax返回的图片添加水印?

axse (

    function (data) {
        var str = data.d;
        var obj = JSON.parse(str);
        var banNum = obj.data[0].ImageView;
        console.log(banNum);
        var canvas=document.getElementById("myCanvas");
        for (var i=0;i < banNum.length;i++) {
            var img_url = banNum[i].ImgUrl;
            $("<img class='my_img"+i+"' id='img"+i+"' style='display: none;' src='"+img_url+"'></img>").appendTo('body');
            var img_height = $('.my_img'+i+'').css('height');
            var img_width = $('.my_img'+i+'').css('width');
            $("#myCanvas").attr({'width':img_height,'height':img_height});
            var img_id = document.getElementById('img'+i+'');    
            var ctx=canvas.getContext("2d");
               // 绘制图片
               ctx.drawImage(img_id,0,0);
               // 绘制水印
               ctx.font="15px microsoft yahei";
               ctx.fillStyle = "rgba(255,255,255,.5)";
              ctx.fillText("my images",100,100);
            $("#imga").attr('src',canvas.toDataURL());
        }
    }
)

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)
等待大神答复

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...