how to prevent user from dragging google map to gray area - google-maps-api-3

I am using Google maps API to show country.
If I move the map up or down it is possible to get to gray area. ( not matter to the size of the zoom )
Is it possible to prevent the option to get to the gray area meaning to control on the move of the user and when the gray area should appear to prevent from him to do the move of the map to this area ?

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Add marker/dot on image at accurate pixel with zoom in/out functionality

I'am using reactJS and want to design a component with following functionality :
Display pixelated image which is able to zoom in and zoom out at pixel level.
When clicked on image , display a marker- which can be a dot or icon at specific position.
When image is zoomIn/zoomOut, marker size and position should not change.
Even after zoomIn/zoomOut when clicked on image, marker should get repositioned at proper pixel on the image.
I am thinking of applying same logic as used in the maps/ leaflet. Like they maintain separate layers for map and markers on the map. If we zoomIn/out maps it won't affect the marker position or size, same functionality I want for the image.
Anyone with the solution or related library will be welcomed !
(For reference, I want this design for marking GCP(Ground Control Points) on the image, which requires very precise marking at pixel level)

How to set a LocationRectangle on Universal Windows Platform map control?

I am developing an app in which I have a Map control! On this map, I am adding custom pushpins via map.Children property. How can I set a LocationRectangle and then zoom on it? Because I want my pushpins not to be out of the screen size. I want the map to zoom on a level in which all of the pins will be on the screen!
You can use the MapControl's TrySetViewBoundsAsync method. This method allows you to specify a bounding box of the area you want to display (which you can calculate by finding the the farthest pushpins in all directions, which will give you the north-west and south-east corner of the area), a potential margin and a map animation to use while the view is being changed.
You can find more details about the method in the documentation.

show previous loaded tiles while loading(zoom in or zoom out) map

Friends..
How can we remove the white tile part(map loading area)..
While zoom in and zoom out white tile part is appearing on the map(map loading area).
How can we fill that area with the history image of that area?
And is there any better method to fast load maps than GeoWebCache.
Use transitionEffect configuration option for the layer
http://dev.openlayers.org/releases/OpenLayers-2.13.1/doc/apidocs/files/OpenLayers/Layer/Grid-js.html#OpenLayers.Layer.Grid.transitionEffect

How do i show a country map and make cities separate by changing color of mouseover

How do i show a country map and make cities separate by changing color of mouseover
I need an Idea how to do it like www.mudah.my site.
Basically how they (http://www.mudah.my/) do is by having 1 normal map image with no country highlighted (actually it looks like they use a couple images but make it like 1 image by placing a transparent div over the top of them).
They have a standard image map applied to this '1' image to define the separate areas and when the user mouses over a relevant part of the map they display a specify section of the highlight image (http://www.mudah.my/img/map_highlight.png) in a specific place on top the the existing image, but behind the 1 main transparent div. Presumably so the links associated with the image map) continues to work.
Hope this helps.

How can i set size of openInfoWindowHtml in google Map

Please help me to change size of openInfoWindowHtml in google map and plez tell me can i make it popup out of map area also..? i mean my map area is very small but i want that when user click on Marker this openInfoWindowHtml should show popup and if its crossing size of map than its should show beyond the boundary of google map. ( i am working in asp.net)
There are 2 ways that you can influence the size of the InfoWindow. First, you can pass a GInfoWindowOptions object when you call openInfoWindowHtml (see: http://code.google.com/apis/maps/documentation/reference.html#GInfoWindowOptions) Second, you can wrap the contents of the InfoWindow in a div and use CSS to set the size of that div.
Regardless of which method you use to set the size of the InfoWindow, it can never exceed the bounds of the map canvas (area).

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