Embedding time-stamp into color%

[Hassoun <hassoun.karam.1@agora.ulaval.ca>]

hi

i am trying to implement an algorithm that allows the identification of 
a graphical object (line, circle, etc...) through a mouse click on that 
object.

i have create a derived class of color% that has an attribute for 
time-stamp. then i drew, for instance, a blue rectangle object and 
embedded the time-stamp of its creation time into it. when i create a 
set of rectangles (all with the same color), i would like to be able to 
retrieve one of them by matching the time-stamp of the color (from my 
derived class) returned by "(send a-bitmap-dc get-pixel x y color)" with 
the time-stamp of the target rectangle.

i came to the conclusion (with my modest knowledge of DrScheme) that 
this cant be done. the identification of a color on my screen is 
exclusively dependant on the color of the pixel itself and cant be 
linked to another attribute. am i right? is there another way?

thanks

-- 
Hassoun Karam
hassoun.karam.1@agora.ulaval.ca