想了解下Tag云图，文本云图的的制作原理，所需技术。
像这两种图，都是在线网站生成的，可以设置各种图案，颜色，可以从URL分析网站关键字频率生成关键字图。等等
这些都是使用的什么技术呢，使用C和gtk+开发成桌面应用可行吗，还有就是还需要哪些技术，开发难度有多大。
先谢谢了。
github上在浏览器中实现的方案有很多，bower一搜就出来了。
做成桌面应用没必要吧，web兼容性又好，浏览器开小窗口或全屏之后效果一样。
推荐下各平台做数据可视化的工具:
Win下用vvvv连几根线就好了。
MAC下用MAX/MSP也很简单。
跨平台最方便的是processing。
bower search cloud
Search results:
d3cloud git://github.com/rajenms/d3-cloud.git
d3-cloud git://github.com/jasondavies/d3-cloud.git
awesomecloud git://github.com/rajenms/jQuery.awesomeCloud.plugin.git
cloudinary_js git://github.com/cloudinary/cloudinary_js.git
epixcloud git://github.com/BrandwatchLtd/epixcloud.git
soundcloud git://github.com/soundcloud/soundcloud-javascript.git
cloudkid-os git://github.com/CloudKidStudio/CloudKidOS.git
cloudinary_angular git://github.com/jbcpollak/cloudinary_angular.git
cloudkid-sound git://github.com/CloudKidStudio/CloudKidSound.git
angular-word-cloud git://github.com/Venturocket/angular-word-cloud.git
cloudkid-namespace git://github.com/CloudKidStudio/namespace.git
seaofclouds.tweet git://github.com/seaofclouds/tweet.git
cloudkid-debug git://github.com/CloudKidStudio/CloudKidDebug.git
cloudkid-audio git://github.com/CloudKidStudio/CloudKidAudio.git
cloudkid-states git://github.com/cloudkidstudio/CloudKidStates.git
cloudkid-animation git://github.com/CloudKidStudio/CloudKidAnimation.git
cloudkid-tasks git://github.com/CloudKidStudio/CloudKidTasks.git
cloudkid-captions git://github.com/CloudKidStudio/CloudKidCaptions.git
amd-d3-cloud git://github.com/Mirajjj/d3-cloud.git
cloudinary git://github.com/seba-1511/cloudinary_js.git
soundcloud.custom.player git://github.com/soundcloud/soundcloud-custom-player.git
jQCloud git://github.com/coron3r/jQCloud.git
cloudinary_ng git://github.com/cloudinary/cloudinary_angular.git
ti-cloudinary git://github.com/thoughtindustries/ti-cloudinary.git
happyclouds git://github.com/FlorianBaumgartl/HappyClouds.git
angular-cloud-storage git://github.com/maxs15/angular-cloud-storage.git
wordcloud2.js git://github.com/timdream/wordcloud2.js.git
ilanguage-cloud git://github.com/iLanguage/iLanguageCloud
threex.cloudgaming git://github.com/jeromeetienne/threex.cloudgaming.git
songlocator-soundcloud git://github.com/songlocator/songlocator-soundcloud
cloud-station git://github.com/rajahafify/cloud-station.git
ng-bubble-cloud git://github.com/paulmelnikow/ng-bubble-cloud.git
cloudkid-translate git://github.com/CloudKidStudio/CloudKidTranslate.git
fis-cloud-app-ppt git://github.com/wangcheng714/fis-cloud-app-ppt.git