形状内文本环绕的算法

Question

我正在寻找一种算法来将文本包装在非矩形形状内,最好是基于Knuth和Plass算法.最难的部分是由于文本中的字体大小不同,线条可能具有不同的高度.下图是算法应该能够生成的示例.

Answer 1

编辑,更新

尝试

text/html

    
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JS

var text =  "Lorem ipsum dolor sit amet," // `string` , `array` 
, i = -1
, elem = document.querySelector("pre");
elem.innerText = elem.innerText.replace(/[^\n|\r|\t|\s+]/g, function() {
                   return text[++i] 
                 });

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     consectetur adipisci         ng elit. Vivamus b
   landit nisl eu posuere s     uscipit. Etiam at quam
  sed nulla consequat finibu   s et eget ligula. Nam sit
 amet imperdiet eros. Ut a congue nibh. Sed ac arcu non r
isus commodo lobortis et at lorem. Pellentesque pulvinar v
enenatis pellentesque. Praesent sed pulvinar justo. Ut nec
 turpis lectus. Suspendisse porta ipsum orci, nec vestibul
um tellus luctus quis. Morbi eleifend vel nibh sed rutrum.
 Etiam feugiat, nunc et efficitur accumsan, quam magna lac
 inia neque, eu ullamcorper purus turpis eget urna. Etiam
   lacus mi, gravida vel mollis ut, viverra sed ipsum. M
   auris in augue turpis.Nulla facilisi. In tristique t
     ortor sit amet leo cursus, sit amet varius ligula
       sollicitudin. Mauris commodo et sapien id sce
        lerisque. Integer et diam eget arcu bibend
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var text = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus blandit nisl eu posuere suscipit. Etiam at quam sed nulla consequat finibus et eget ligula. Nam sit amet imperdiet eros. Ut a congue nibh. Sed ac arcu non risus commodo lobortis et at lorem. Pellentesque pulvinar venenatis pellentesque. Praesent sed pulvinar justo. Ut nec turpis lectus. Suspendisse porta ipsum orci, nec vestibulum tellus luctus quis. Morbi eleifend vel nibh sed rutrum. Etiam feugiat, nunc et efficitur accumsan, quam magna lacinia neque, eu ullamcorper purus turpis eget urna. Etiam lacus mi, gravida vel mollis ut, viverra sed ipsum. Mauris in augue turpis."

+ "Nulla facilisi. In tristique tortor sit amet leo cursus, sit amet varius ligula sollicitudin. Mauris commodo et sapien id scelerisque. Integer et diam eget arcu bibendum ornare a in tortor. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam vehicula diam ac laoreet tincidunt. Integer sed tellus sit amet lacus bibendum tristique a a nulla. Quisque venenatis suscipit est eget ultricies. Quisque ac orci convallis, interdum enim quis, dictum justo. Phasellus tincidunt nisi vitae justo fringilla, sit amet pellentesque enim dictum. Duis porttitor convallis feugiat. Sed lectus massa, consectetur et vestibulum a, egestas ac eros. Proin mollis ligula tellus, a dignissim eros placerat sed. Donec vel blandit magna. Etiam quis tortor rhoncus, porta ante et, pretium mi."

+ "Vestibulum ut risus convallis, sagittis orci sed, faucibus erat. Aliquam maximus suscipit lectus, vel pellentesque enim dictum nec. Sed et ex id mauris finibus molestie. Aliquam erat volutpat. Etiam nec ultricies est. Aenean vitae mi id neque vulputate suscipit vel vitae ante. Nam sit amet mi diam. Phasellus efficitur faucibus viverra. Proin cursus purus et tortor dictum elementum. Nunc vehicula erat volutpat, rutrum metus bibendum, blandit sem."

+ "Nam eu ante eros. Sed pellentesque accumsan neque, eu vulputate lectus luctus ac. In hac habitasse platea dictumst. Nulla vitae dictum diam. Sed eget mauris in felis luctus luctus. Mauris volutpat lacus in est dignissim, sit amet venenatis ipsum laoreet. Phasellus semper id velit ut tristique. Proin dictum erat at mauris lacinia blandit. Ut scelerisque mi ex, ut pretium elit commodo sit amet. Praesent faucibus turpis tellus, ac vulputate felis aliquet eget. Ut est urna, dignissim nec risus sit amet, eleifend lacinia enim. Donec non massa in purus efficitur placerat. Donec accumsan neque elit, eget vulputate metus finibus quis. Ut interdum sem vel felis imperdiet pretium. Integer erat neque, bibendum id egestas nec, facilisis sed massa."

+ "Curabitur sit amet mattis odio. Mauris mattis turpis eu lectus eleifend, semper ultrices elit malesuada. Mauris fringilla arcu sed sem vehicula vulputate. Donec semper nisl ut urna bibendum, quis eleifend tortor commodo. Pellentesque vehicula est et neque vulputate accumsan. Duis faucibus sodales lacus et suscipit. Pellentesque tortor enim, pulvinar scelerisque pretium non, aliquam sed risus. Vestibulum aliquam dolor ipsum, eget pretium ante fermentum a. Donec semper lectus pulvinar tellus hendrerit sagittis. Nunc blandit sed ligula vel consequat. Etiam sed est quis nulla blandit blandit. Sed in enim pulvinar elit accumsan faucibus sed sodales lorem. Aenean ac efficitur arcu, sed fringilla lectus."

, i = -1;
var elem = document.querySelector("pre");
elem.innerText = elem.innerText.replace(/[^\n|\r|\t|\s+]/g, function() {
                   return text[++i] 
                 });

<pre>    
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     gggggggggggggggggggg         gggggggggggggggggg
   gggggggggggggggggggggggg     gggggggggggggggggggggg
 ggggggggggggggggggggggggggg   ggggggggggggggggggggggggg
ggggggggggggggggggggggggggggggggggggggggggggggggggggggggg
gggggggggggggggggggggggggggggggggggggggggggggggggggggggggg
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</pre>

Answer 2

对于一个简单的算法，我们假设您可以计算每个单词周围的边界框，并且您有一个带有要填充的形状蒙版的图像。

从图像蒙版的顶部向下扫描，直到找到与第一个单词一样长的线。看看是否可以将其向下延伸成边界框大小的矩形。如果是这样，请删除第一个单词。如果没有，继续扫。

删除一个单词后，看看是否可以将边界框扩展为（第一个框 + 第二个框 + 空间）的宽度和 max（第一个框，第二个框）的高度。如果是这样，请删除第二个词。如果没有，请将第一个单词从左到右置于适合图像蒙版（从左到右）的边界框内，从蒙版中删除该边界框，然后继续。

您可以通过坚持线条具有相同的基线（即使被形状打破）（例如穿过心脏顶部小块的线条）来使这稍微花哨一些；然后，您需要有一个备用的“继续沿此基线”条件。但上面的基本想法，使用图像蒙版来尝试将矩形放入其中，完成后将其删除，就可以完成这项工作。

（使用几何运算比这里描述的基于像素的运算要快，但是人们必须担心所有情况来弄清楚边界框如何适合任意多边形，并且这里解释起来有点长。）