qt实现的地图浏览器，能对地图进行基本的操作如拖动，放大，缩小。有助于qt的学习,the realization of the map qt browser can map the basic operation such as dragging, zooming and narrow. Contribute to the learning qt

svg，自由拖动，矩形框与文本编组，形成拖动矩形时，文本同时移动的效果，如同文件就是矩形的内容。-svg, freedom dragging a rectangle with the text grouping to form a rectangle when you drag text while moving effect, as the file is rectangular content.