[Qgis-developer] requesting local map tiles with qgis

[mini circuit]

hello all;

i have the map tiles according to zoom level x and y coordinates as shown
below:

*-5-(zoom level 5)*
*-->20 (x)
    -->18.png (y)
-->21 (x)
   -->18.png (y)*

*-6-(zoom level 6)*
*-->41 (x)
    -->36.png (y)
-->42 (x)
   -->36.png (y)*
*-7-* *(zoom level 7)*
 .
 .
 .
*-13- **(zoom level 13)*

i want to do three things:

*1) *i want to request these tiles according to zoom level x and y
specified by the user.
i am not sure if i can do that with wms xml file since the tiles are
available locally.
so for example if the user double click on the screen i will increase the
zoom level and i will request the appropriate tiles according to x and y

*2) *i want to show the exact coordinates system (lat, log) on the tile
when the user moves the mouse cursor

*3) *i want to add a new layer on top of my map to create markers on a
specific lat and log position

am using c++ language with qtcreator,

i appreciate any directions or help since am totally new to qgis and gis
programming ..
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