This is interesting, isn't it?
(http://s12.postimg.org/szivo15ft/x_y_zoom.jpg) (http://postimg.org/image/szivo15ft/) (http://s15.postimg.org/cdzrs4a2f/quadkey.jpg) (http://postimg.org/image/cdzrs4a2f/)
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<name>Tile Number</name>
<mode>Type 0 : Spheric, Inverse Y</mode>
<url><![CDATA[http://chart.apis.google.com/chart?chs=256x256&chf=bg,lg,45,efefef80,0,bbbbbb80,1&chst=d_text_outline&chld=ff0000|22|h|ffffff|b||||Zoom%20{z}|X,Y%20%20:%20%20{x},%20{y}|||||_____________________]]></url>
<zoomPart>{z}-8</zoomPart>
<zoomMin>8</zoomMin>
<zoomMax>30</zoomMax>
<tileSize>256</tileSize>
<attribution><![CDATA[Type 0 - Mercator projection, Spheric, Inverse Y]]></attribution>
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<name>Tile Number</name>
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<url><![CDATA[http://chart.apis.google.com/chart?chs=256x256&chf=bg,lg,45,efefef80,0,bbbbbb80,1&chst=d_text_outline&chld=ff0000|22|h|ffffff|b||||Zoom%20{z}|X,Y%20%20:%20%20{x},%20{y}|||||_____________________]]></url>
<zoomPart>{z}-8</zoomPart>
<zoomMin>8</zoomMin>
<zoomMax>30</zoomMax>
<tileSize>256</tileSize>
<attribution><![CDATA[Type 1 - Mercator projection, Spheric, Normal Y]]></attribution>
<extraHeader><![CDATA[User-Agent#Mozilla/5.0 (Windows NT 6.1; WOW64; rv:7.0.1) Gecko/20100101 Firefox/7.0.1]]></extraHeader>
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<name>Tile Number</name>
<mode>Type 2 : Ellipsoid, Inverse Y</mode>
<url><![CDATA[http://chart.apis.google.com/chart?chs=256x256&chf=bg,lg,45,efefef80,0,bbbbbb80,1&chst=d_text_outline&chld=ff0000|22|h|ffffff|b||||Zoom%20{z}|X,Y%20%20:%20%20{x},%20{y}|||||_____________________]]></url>
<zoomPart>{z}-8</zoomPart>
<zoomMin>8</zoomMin>
<zoomMax>30</zoomMax>
<tileSize>256</tileSize>
<attribution><![CDATA[Type 2 - Mercator projection, Ellipsoid, Inverse Y]]></attribution>
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<provider id="11803" type="3" visible="true" background="-1">
<name>Tile Number</name>
<mode>Type 3 : Ellipsoid, Normal Y</mode>
<url><![CDATA[http://chart.apis.google.com/chart?chs=256x256&chf=bg,lg,45,efefef80,0,bbbbbb80,1&chst=d_text_outline&chld=ff0000|22|h|ffffff|b||||Zoom%20{z}|X,Y%20%20:%20%20{x},%20{y}|||||_____________________]]></url>
<zoomPart>{z}-8</zoomPart>
<zoomMin>8</zoomMin>
<zoomMax>30</zoomMax>
<tileSize>256</tileSize>
<attribution><![CDATA[Type 3 - Mercator projection, Ellipsoid, Normal Y]]></attribution>
<extraHeader><![CDATA[User-Agent#Mozilla/5.0 (Windows NT 6.1; WOW64; rv:7.0.1) Gecko/20100101 Firefox/7.0.1]]></extraHeader>
</provider>
<provider id="11804" type="4" visible="true" background="-1">
<name>Tile Number</name>
<mode>Type 4 : Spheric, Y from Center</mode>
<url><![CDATA[http://chart.apis.google.com/chart?chs=256x256&chf=bg,lg,45,efefef80,0,bbbbbb80,1&chst=d_text_outline&chld=ff0000|22|h|ffffff|b||||Zoom%20{z}|X,Y%20%20:%20%20{x},%20{y}|||||_____________________]]></url>
<zoomPart>{z}-8</zoomPart>
<zoomMin>8</zoomMin>
<zoomMax>30</zoomMax>
<tileSize>256</tileSize>
<attribution><![CDATA[Type 4 - Mercator projection, Spheric, Y from Center]]></attribution>
<extraHeader><![CDATA[User-Agent#Mozilla/5.0 (Windows NT 6.1; WOW64; rv:7.0.1) Gecko/20100101 Firefox/7.0.1]]></extraHeader>
</provider>
<provider id="11805" type="5" visible="true" background="-1">
<name>Tile Number</name>
<mode>Type 5 : Spheric, Quadkey</mode>
<url><![CDATA[http://chart.apis.google.com/chart?chs=256x256&chf=bg,lg,45,efefef80,0,bbbbbb80,1&chst=d_text_outline&chld=ff0000|22|h|ffffff|b||||Quadkey|{c}|||||_____________________]]></url>
<zoomPart>{z}-8</zoomPart>
<zoomMin>8</zoomMin>
<zoomMax>30</zoomMax>
<tileSize>256</tileSize>
<attribution><![CDATA[Type 5 - Mercator projection, Spheric, Quadkey]]></attribution>
<extraHeader><![CDATA[User-Agent#Mozilla/5.0 (Windows NT 6.1; WOW64; rv:7.0.1) Gecko/20100101 Firefox/7.0.1]]></extraHeader>
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To understand the parameters for background color/transparency/gradation and font size/color/position, please refer the links below.
http://imagecharteditor.appspot.com/ (http://imagecharteditor.appspot.com/) -> Editor tab -> Fills -> Background
https://developers.google.com/chart/image/docs/gallery/dynamic_icons#outlined_text (https://developers.google.com/chart/image/docs/gallery/dynamic_icons#outlined_text)
Quote from: ta-kaThis is interesting, isn't it?
nope ;D
:-X
sad... :'(
but it's ok. ;D