HTML5实现Word中文字全环绕图片效果
實現這個功能是當時看見數字報的展示出來的編排方式，就是圖片+熱點，而且下載打開還是PDF的，讓我這個WP用戶咋個看。想實現Word中的編排方式，也需要瀏覽器支持Word插件，火狐、谷歌、Opera這些都要另外弄插件，很麻煩的。
還好，H5出來了，用它就能辦很多事情，比如說文字環繞效果。
先上圖。
上圖是谷歌瀏覽器的實現效果，下圖為WP上的實現效果。
其實實現原理是每個文字在DIV中的定位，然后判斷字是否與像素點碰撞，就這么簡單。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>無標題文檔</title>
<style>
#paper{
position:relative;
top:30px;
left:40px;
border:1px #000 solid;
width:400px;
height:400px;
overflow:hidden;
}
.f{
font-family:Verdana, Geneva, sans-serif;
font-size:14px;
position:absolute;
overflow:hidden;
}
</style>
</head>
<body>
<div id="c" style="width:1px; height:1px; overflow:hidden; border:none;"><canvas id="canva" width="400" height="400" ></canvas></div>
<div id="paper"></div>
</body>
<script>
var cvs = document.getElementById('canva');
var ctx = cvs.getContext("2d");
var p = document.getElementById('paper');
p.style.width="350px";
p.style.height="400px";
var words = " ?河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹河蟹vv。";
var words2=' ?帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表帶三個表。';
var c_col = 0;
var c_row = 0;
var img = document.createElement('img');
img.style.width = "136px";
img.style.height = "99px";
//img.src='flag_1_b.png';
img.src='bg2.png';
img.style.top='35px';
img.style.left='150px';
img.style.position='absolute';
p.appendChild(img);
var p_w_picpath = new Image();
p_w_picpath.src = 'bg2.png';
p_w_picpath.οnlοad=function(){
ctx.fillStyle='#fff';
ctx.fillRect(0,0,getNum(p.style.width),getNum(p.style.height));
ctx.drawImage(p_w_picpath,150,35,136,99);
addWord(words,ctx);
addWord(words2,ctx);
}
function getNum(sw){
return parseInt(sw.substring(0,sw.split('').length-2));
};
function addWord(words,ctx){
var pix = 2;//像素容差3倍
var paper= document.getElementById('paper');
var wordwidth=16;
var wordheight = 16;
var sw = paper.style.width+"";
var w = getNum(sw);//寬
var sh = paper.style.height+"";
var h = getNum(sh);//高
var cols = parseInt(w/wordwidth);
var word = words.split('');
/*
*/
for(var i = 0 ; i < word.length ; i++){
if(c_col>=cols){
c_col=0;
c_row++;
}
//console.info("c_col:"+c_col+"#c_row:"+c_row);
var letter = document.createElement('div');
letter.appendChild(document.createTextNode(word[i]));
letter.setAttribute('class','f');
letter.style.width = wordwidth+"px";
letter.style.height = wordheight+"px";
var pos_c = 0;
var pos_r = 0;
var inner = false;
var canwrite = false;
while(!canwrite){
var count=0;
var imgdata = ctx.getImageData(wordwidth*(c_col+pos_c),wordheight*(c_row+pos_r),wordwidth,wordheight);
for(var ii = 0; ii < imgdata.data.length;ii++){
var r = imgdata.data[ii+0];
var g = imgdata.data[ii+1];
var b = imgdata.data[ii+2];
var a = imgdata.data[ii+3];
ii=ii+4;
/*
if(0+pix < r){
count++;
}else if(0+pix < g){
count++;
}else if(0+pix < b){
count++;
}
*/
if(255-pix > r){
count++;
}else if(255-pix > g){
count++;
}else if(255-pix > b){
count++;
}
}
var total = wordwidth*wordheight;
if(count/total<0.03){
canwrite = true;
}else{
if((getNum(img.style.width)+getNum(img.style.left)) + wordwidth < w){//如果圖片離右邊框還有間隙
pos_c++;
}else{//圖片離有邊框沒有間隙
pos_c=0;
c_col=0;
c_row=c_row+1;
}
}
}
/* ?只判斷正規矩形圖片
//判斷左上角
if(getNum(img.style.left)<=(wordwidth*c_col) && (wordwidth*c_col)<=(getNum(img.style.width)+getNum(img.style.left))){
if(getNum(img.style.top)<=(wordheight*c_row) && getNum(img.style.top)+getNum(img.style.height)>=(wordheight*c_row) ){
//在圖像區域內
inner = true;
if((getNum(img.style.width)+getNum(img.style.left)) + wordwidth < w){//如果圖片離右邊框還有間隙
pos_c = parseInt((getNum(img.style.width)+getNum(img.style.left))/wordwidth+0.5)-c_col;
}else{//圖片離有邊框沒有間隙
pos_c=0;
pos_r = parseInt((getNum(img.style.height)+getNum(img.style.top))/wordheight+0.5)-c_row;
}
}
}
//判斷右上角
if(!inner)
if(getNum(img.style.left)<=(wordwidth*c_col+wordwidth) && (wordwidth*c_col+wordwidth)<=(getNum(img.style.width)+getNum(img.style.left))){
if(getNum(img.style.top)<=(wordheight*c_row) && getNum(img.style.top)+getNum(img.style.height)>=(wordheight*c_row) ){
//在圖像區域內
inner = true;
if((getNum(img.style.width)+getNum(img.style.left)) + wordwidth < w){//如果圖片離右邊框還有間隙
pos_c = parseInt((getNum(img.style.width)+getNum(img.style.left))/wordwidth+0.5)-c_col;
}else{//圖片離有邊框沒有間隙
pos_c=0;
pos_r = parseInt((getNum(img.style.height)+getNum(img.style.top))/wordheight+0.5)-c_row;
}
}
}
//判斷左下角
if(!inner)
if(getNum(img.style.left)<=(wordwidth*c_col) && (wordwidth*c_col)<=(getNum(img.style.width)+getNum(img.style.left))){
if(getNum(img.style.top)<=(wordheight*c_row+wordheight) && getNum(img.style.top)+getNum(img.style.height)>=(wordheight*c_row+wordheight) ){
//在圖像區域內
inner = true;
if((getNum(img.style.width)+getNum(img.style.left)) + wordwidth < w){//如果圖片離右邊框還有間隙
pos_c = parseInt((getNum(img.style.width)+getNum(img.style.left))/wordwidth+0.5)-c_col;
}else{//圖片離有邊框沒有間隙
pos_c=0;
pos_r = parseInt((getNum(img.style.height)+getNum(img.style.top))/wordheight+0.5)-c_row;
}
}
}
//判斷右下角
if(!inner)
if(getNum(img.style.left)<=(wordwidth*c_col+wordwidth) && (wordwidth*c_col+wordwidth)<=(getNum(img.style.width)+getNum(img.style.left))){
if(getNum(img.style.top)<=(wordheight*c_row+wordheight) && getNum(img.style.top)+getNum(img.style.height)>=(wordheight*c_row+wordheight) ){
//在圖像區域內
inner = true;
if((getNum(img.style.width)+getNum(img.style.left)) + wordwidth < w){//如果圖片離右邊框還有間隙
pos_c = parseInt((getNum(img.style.width)+getNum(img.style.left))/wordwidth+0.5)-c_col;
}else{//圖片離有邊框沒有間隙
pos_c=0;
pos_r = parseInt((getNum(img.style.height)+getNum(img.style.top))/wordheight+0.5)-c_row;
}
}
}
*/
letter.style.top=(wordheight*c_row)+"px";
letter.style.left=(wordwidth*(c_col+pos_c))+"px";
paper.appendChild(letter);
c_col=c_col+pos_c+1;
}
c_col=0;
c_row++;
}
</script>
</html>
上面代碼里面注釋掉的那判斷正規矩形代碼可以在IE8下面運行，之前我在IE8下可以運行canvas，但現在不知道怎么就跑不了咯。。汗。。
永遠不支持IE6!!
歡迎交流。。。
轉載于:https://blog.51cto.com/zwkpc/1343373
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