🚀 go-pugleaf

On Mon, 2 Aug 1999 19:59:44 +0200, "Pierre Fenkart" <Falke2@gmx.de>
wrote:

>Hi!
>
>I know, how i can calculate the position of the mouse in x and y
>coordinates, but I don't know, how i can get information wether the colour
>is blue, red or green about the picture on this x and y coordinates.
>
>Also I don't know, how I can make around the Mouse a circle, and calculate
>all the pixels (in the picture) wether the colour is blue, red or green (how
>many pixels are in the circle)
>
>Does anybody know something how i can interrogate this?
>
>Thanks in advanced
>
>Pierre
>
>
>
>
POINT(X,Y) will give you the RGB value at the point.

As for the other, this should work:

'
' look at all pixels in the square containing the circle
'
for xx = x - r to x + r
for yy = y - r to y + r
'
' only use pixels that are in the circle
'
if sqr((xx-x)^2 + (yy-y)^2) <= r
'...do something with point(xx,yy)
'...and count the number of pixels
end if
next yy
next xx