标签：creat sign sig url order title pre image baidu
在上一篇中实现一个icon + label的Marker需要使用两个Tangram的Marker， 今天分析了Tangram的源码后， 发现Tangram时支持单一Marker同时显示的， 这需要使用嵌套的Style。
上一篇使用的Style是两个：
style: points, color: white, size: [32px, 32px], order: 100, collide: false
和
text: text_source: function(){ return "label"}, priority: 100
但其实points style支持text属性， 两个合并后变成：
style: points, color: white, size: [32px, 32px], order: 100, collide: false, text: text_source: ‘function(){ return \"Title\"}‘, priority: 100
代码如下
void MarkerImpl::createMarker(const std::string &iconURI, const std::string &title) { QImage img(QString(iconURI.c_str())); int width = img.width(); int height = img.height(); auto argb = new unsigned int [width * height]; for(int h=height-1; h>-1; --h){ for(int w=0; w<width; ++w){ int pix = img.pixelColor(w, h).rgba(); int pb = (pix >> 16) & 0xff; int pr = (pix << 16) & 0x00ff0000; int pix1 = (pix & 0xff00ff00) | pr | pb; argb[w + h*width] = pix1; } } m_map->markerSetBitmap(m_ID, width, height, argb); delete[] argb; static const char* MARKER_STYLE_TEMPLATE = "{ style: ‘points‘," " color: ‘white‘," " size: [%1px, %2px]," " order: 100," " collide: false," " text: {" " text_source: ‘function(){ return \"%3\"}‘," " priority: 100 } }"; QString iconStyle = QString(MARKER_STYLE_TEMPLATE).arg(width).arg(height).arg(title.c_str()); m_map->markerSetStyling(m_ID, iconStyle.toStdString().c_str()); }
这里使用了单行YAML的写法， 详见http://baike.baidu.com/link?url=oZjxiBc2gjv6W4Kx3UpMIjzsBhmmY2MJ9VayYJx-1qAZZiN_R16J2H8mMXH0j2a-eYwjiOI5zkKcy1ehSF8WIK#2_2
标签：creat sign sig url order title pre image baidu
原文地址：http://www.cnblogs.com/btian/p/6143006.html
