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</o:shapelayout></xml><![endif]--></head><body lang=ZH-CN link=blue vlink=purple style='text-justify-trim:punctuation'><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black;background:white'>I'm using QGIS-2.4.0 API to develop application.<span class=apple-converted-space> </span></span><span lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:black'><br><br><span style='background:white'>I need a map that composed of several vector layers. If only this, it can be done by merge in QGIS, but I need more for that: the map(or project?) I want is composed of several layers, each layer has its own attributes, such as style: color/labels, the visibility of scale dependent. For example, the map MYMAP I made is composed of city.shp layer, river.shp layer, road.shp layer. When scale is changed, it displays different from city to river,road. I don't think this can be done by merge only.<span class=apple-converted-space> </span></span><br><br><span style='background:white'>It can be done by the software QGIS, but in API development, it is difficult to do such things. So I think there got be a better way, for now I think it can be done by:<span class=apple-converted-space> </span></span><br><br><span style='background:white'> 1.A composed map. A map that composed by several .shp maps, and their attributes, make it in QGIS software and use the map in apps. In apps, it can load the map and the rest things are same as a single map.<span class=apple-converted-space> </span></span><br><span style='background:white'> 2.A project. A project that composed by these things, this also be done in QGIS software. In apps, it can load project, but at the same time, the .shp maps used in project will be needed too.<span class=apple-converted-space> </span></span><br><br><span style='background:white'>I don't know if I make my point clear, and I don't know how to do it for my point, or if there is a better way to do it, any advice appreciated!<span class=apple-converted-space> </span></span></span><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:14.0pt'>Regards,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:14.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:14.0pt'>Bob<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>