Re: How to get pixel values along a line?

[Andrew Sobala <aes gnome org>]

That's a simple maths question, not GTK. If the user picks (x1,y1) and 
(x2,y2), then the points along that line conform to y = (y2 - y1)/(x2 - 
x1) * (x - x1) + y1. (I think!)

So plug in values for x from x1 to x2, and pull out y (with appropriate 
whole-number rounding.)

Hope that's vaguely helpful!
--
Andrew

Fredrik Persson wrote:
> I writing a gtk application where I need to do the following; let the user
> mark two pixels in a drawingarea (as you would if you were to draw a line
> in, for example, the gimp) and then, somehow, have the pixel values along
> that line be returned to me in some form. The goal is to present a graph to
> the user with those pixel values.
>
> The problem at hand is; how do I get those pixel values?
>
> (And I'm writing this in pyhon, so if someone wants to provide code 
> examples
> in python, that would be great.)
>
> TIA!
>
> /Fredrik Persson
>
>
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