How to put each record in the corresponding range

When compiling a program, you encounter a problem:

Draw a heat map: Calculate the thermal value---> Draw the grid, the cumulative count of Mac that is positioned within a certain range---> write a locator, but how to put each specific coordinate value into the corresponding range (GRID)---> Because the specific coordinates and grid selection coordinates (such as the center point of the grid) are linear corresponding, so you can do a modulo operation, the specific coordinates in the range of the remainder of the removal, you can correspond to the corresponding mesh, modulo operation is very critical.

How to put each record in the corresponding range