pixel drawing

i have the following 2 arrays. 
gfloat pixel[6000][1] = x[n]
gfloat pixel[6000][2] = y[n]
this 2 arrays contains the x/y values for 6000 rectangles
drawn on a pixmap. Now my problem ...
with button_press_event i catch the current x/y positions
from screen. What i want is to draw the given pixels from
my arrays in a different color when i'm close to it with my mouse.
i know my english is very confuse. but i hope you understand what i'm
Please hit me to the right way ;-)
thanx! Andreas

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