Re: Embedding time-stamp into color%

[Robert Bruce Findler <robby@cs.rice.edu>]

I believe that it is possible to do what you want, but only by copying a
separate copy of the entire bitmap on the side with the additional
information you need. This is probably not a good approach.

Instead, consider using a pasteboard%. The circles, rectangles, etc.
become snip%s.

Hope that helps,
Robby

Hassoun wrote:
> 
> 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