google-maps - Google 静态 map - 画一个圆圈

Question

尝试创建一个带圆圈的静态 map ，如 this

在path参数中，我不明白如何获取enc部分。这似乎是一些编码路径，包括圆的纬度/经度和大小。

https://maps.googleapis.com/maps/api/staticmap?
center=51.44208,5.47308&
zoom=14&
size=693x648&
path=color:blue|fillcolor:0x00d2c196|weight:1|
enc%3Aad_yHofn%60%40JyFh%40sF%60AcFxAmElBqD~BoCnCiBtC_AzCUzCTvC~%40lChB~BnCnBpDxAlE%60AbFf%40rFLxFMxFg%40rFaAbFyAlEoBpD_CnCmChBwC~%40%7BCT%7BCUuC_AoCiB_CoCmBqDyAmEaAcFi%40sFKyF%3F%3F

Link to Google's documentation

**编辑:找到这些:

Drawing a circle Google Static Maps

Encoded Polyline Algorithm Format

Answer 1

这是我想出的:

function funcStaticMapWithCircle($lat, $lng) {

    //$lat & $lng are center of circle

    $mapCentLat =   $lat + 0.002;
    $mapCentLng =   $lng - 0.011;
    $mapW =         600;
    $mapH =         600;
    $zoom =         14;

    $circRadius =       0.75;         //Radius in km
    $circRadiusThick =  1;
    $circFill =         '00BFFF';
    $circFillOpacity =  '60';
    $circBorder =       'red';

    $encString = GMapCircle($lat,$lng,$circRadius); //Encoded polyline string


    $src =  'https://maps.googleapis.com/maps/api/staticmap?';
    $src .= 'center=' .$mapCentLat. ',' .$mapCentLng. '&';
    $src .= 'zoom=' .$zoom. '&';
    $src .= 'size=' .$mapW. 'x' .$mapH.'&';
    $src .= 'maptype=roadmap&';
    $src .= 'style=feature:water|element:geometry.fill|color:0x9bd3ff&';
    $src .= 'path=';
    $src .= 'color:0x' .$circBorder. '00|';
    $src .= 'fillcolor:0x' .$circFill.$circFillOpacity. '|';
    $src .= 'weight:' .$circRadiusThick. '|';
    $src .= 'enc:' .$encString;


    return $src;
}

GMapCircle 函数来自:Drawing a circle Google Static Maps