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img2txt.html
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<!DOCTYPE HTML>
<html>
<head>
<meta charset="UTF-8">
<title>img2txt：基于canvas的图片转字符画工具</title>
</head>
<body>
<style type="text/css">
#hananBackgroundColorOpacity{margin:10px 0;}
#hananBackgroundColorOpacity span{margin-left:10px; color:#8a8c8e;}
#hananBackgroundColorOpacity textarea{width:650px; height:120px; padding:5px; color:#fff; background:#000;}
#hananBackgroundColorOpacity strong{color:#000;}
#hananBackgroundColorOpacity h3{color:#000; border-bottom:1px solid #ccc; line-height:57px;}
#hananBackgroundColorOpacity h3 a{ color: #000; text-decoration: none; float:right; font-family: "MICROSOFT YAHEI"; font-size: 22px;}
#hananBackgroundColorOpacity h3 .c{ clear:both; height:0px;margin:0;padding:0;}
#hananBackgroundColorOpacity .hanan_introduction,
#hananBackgroundColorOpacity .hanan_introduction a{ font-size:12px; color:#6E6E6E; }
#hananBackgroundColorOpacity img{border:none;}
/* contnet */
* {margin: 0;padding: 0;}
body {font-size: 12px; margin: 10px; font-family: simsun; background: #fff;}
p { height: 12px;}
p.ts { margin: 10px 0 0 0; width: 500px; float: left;}
span {width: 12px;}
#cv, #txt {float: left;}
#cv { margin-right: 5px;}
.bt{ height: 37px; }
form, input {width: 73px;height: 27px;}
form {
position: relative;
float: left;
margin: 0 10px 0 0;
}
#up-button{
position: absolute;
right: 0;
top: 0;
cursor: pointer;
opacity: 0;
filter: alpha(opacity=0);
outline: none;
}
#button{
}
iframe {display: none;}
</style>
<div id="hananBackgroundColorOpacity">
<h3><a href="http://www.cssha.com/">前端手记</a> img2txt：基于canvas的图片转字符画工具
<div class="c"></div>
</h3>
</div>
<div class="bt">
<form id="uf">
<input type="file" name="file" id="up-button"/>
<input type="button" id="button" value="选择图片"/>
</form>
</div>
<canvas id="cv">fuck ie</canvas>
<div id="txt"></div>
<script type="text/javascript">
var cv = document.getElementById('cv');
var c = cv.getContext('2d');
var txtDiv = document.getElementById('txt');
var fileBtn = document.getElementById("up-button");
var img = new Image();
img.src = 'a.jpg';
img.onload = init; // 图片加载完开始转换
fileBtn.onchange = getImg;
// 根据灰度生成相应字符
function toText(g) {
if (g <= 30) {
return '#';
} else if (g > 30 && g <= 60) {
return '&';
} else if (g > 60 && g <= 120) {
return '$';
} else if (g > 120 && g <= 150) {
return '*';
} else if (g > 150 && g <= 180) {
return 'o';
} else if (g > 180 && g <= 210) {
return '!';
} else if (g > 210 && g <= 240) {
return ';';
} else {
return ' ';
}
}
// 根据rgb值计算灰度
function getGray(r, g, b) {
return 0.299 * r + 0.578 * g + 0.114 * b;
}
// 转换
function init() {
txtDiv.style.width = img.width + 'px';
cv.width = img.width;
cv.height = img.height;
c.drawImage(img, 0, 0);
var imgData = c.getImageData(0, 0, img.width, img.height);
var imgDataArr = imgData.data;
var imgDataWidth = imgData.width;
var imgDataHeight = imgData.height;
var html = '';
for (h = 0; h < imgDataHeight; h += 12) {
var p = '<p>';
for (w = 0; w < imgDataWidth; w += 6) {
var index = (w + imgDataWidth * h) * 4;
var r = imgDataArr[index + 0];
var g = imgDataArr[index + 1];
var b = imgDataArr[index + 2];
var gray = getGray(r, g, b);
p += toText(gray);
}
p += '</p>';
html += p;
}
txtDiv.innerHTML = html;
}
// 获取图片
function getImg(file) {
var reader = new FileReader();
reader.readAsDataURL(fileBtn.files[0]);
reader.onload = function () {
img.src = reader.result;
}
}
</script>
</body>
</html>