MapInfo Spatial Server Map Tiling Service - Product Documentation ...

1. Calculate the tile column:
col = (pixelX ÷ tileWidth) + 1
2. Calculate the tile row:
row = (pixelY ÷ tileHeight) + 1
It is important to remember that the pixel location is relative to the map's pixel space and not the screen
space. It may not be enough to directly feed a pixel coordinate from a mouse location on the screen.
For instance, you may have to convert the mouse location to a location in the map's pixel space. This
involves keeping track of the location in map pixels space of the upper right-hand corner of the image
control and offsetting the mouse location with that location.
Transforming a Map Coordinate to a Tile Coordinate
Using the information specified in the section Transforming a Pixel to a Map Coordinate on page 54,
instead, reverse the affine transform and create a transform that goes from map coordinates to pixels.
Feed a coordinate in the map's projection into the affine transform and the result is a coordinate in the
map's pixel space. Next, apply the steps from the section Transforming a Pixel to a Tile Coordinate
on page 54 to convert the pixels from map space to a tile coordinate.
Map Tiling Service Guide
Appendix C: How Pixels, Tiles, and Map Coordinates are Transformed
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