Pixel "Drag and Drop" within a Canvas

[Dan Danger <DanDangerSDL gmx de>]

Hi there,

i want to "Drag and Drop" a Pixel within a Canvas.

If the User clicks on "white Space" within the Canvas, a new Pixel should be 
Created.
If the User clicks on a Pixel, he must be able, to "Drag and Drop" that Pixel 
with the Mouse within that Canvas.

My Question: Does anyone have any sugestions, how to implement this ????
Is it "possible" ???

Greetings
DanDanger

DanDangerSDL gmx de