Pixel Question

jbv jbv.silences at club-internet.fr
Thu Mar 23 16:22:15 EST 2006


great job Scott.

BTW I didn't know that chartonum also worked on binary data...

JB

> Recently, Bob Warren wrote:
>
> > Suppose I have 2 cards in a stack and I am moving the mouse over the top
> > card (naturally). I want to know what colour is under the mouse pointer
> > in a corresponding position on the 2nd card which is hidden underneath.
>
> I believe this function will retrieve the pixel color of a pixel in any
> image using the X,Y position of the pixel as measured from the topleft of
> the image.  Pass the long ID of the image and the X,Y coordinates as
> follows:
>
> on mouseUp
>   answer retrievePixelColor(long id of myImage,5,5)
> end mouseUp
>
> function retrievePixelColor pObj,X,Y
>   put imageData of pObj into tData
>   put ((Y-1) * width of pObj * 4) + ((X-1)*4) into P
>   repeat with N = 2 to 4
>     put charToNum(char (P+N) of tData) & "," after tColor
>   end repeat
>   delete last char of tColor
>   return tColor
> end retrievePixelColor
>
> Let me know if this works for you.
>
> Regards,
>
> Scott Rossi
> Creative Director
> Tactile Media, Multimedia & Design
> -----
> E: scott at tactilemedia.com
> W: http://www.tactilemedia.com
>
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