Python Code :

Thank you very much for your explanation! I still have a question about the same exercise, please kindly explain to me thanks a lot!

Write a program that performs a circular permutation of given shift in a text box.

The answer that I do not understand the rectangle part, can you please kindly help me here?

$```$

p$1=$ Picture$("$ImagesPython$/$HarryPotter$.$jpg$")$

p$2=$ copy$($p$1)$

$11=$ Entry$($width$=10)$

b$1=$ Button$($width$=10)$

borneX, borneY $=$ p$1.$uidth$(),$ p$1.$height$()$

nbPixels $=$ borneX $*$ borneY

def b$1\_$click$()$ :

decalage $=$ int$($i$1.$get$())$

for x in range$($borneX$)$ :

for y in range$($borneY$)$ :

coul $=$ RGB$(*$getRGB$($p$1,$ x$,$ y$))$

nb $=$ int$($borneX $*$ y $+$ x $+$ decalage$)\%$nbPixels

xn $=$ nb $\%$ borneX

yn$\}=\backslash$textrm$\{$nb $//$ bornex

pixel$($p$2,$ xn$,$ yn$,$ coul$)$

$```$

Your reply is below, and I still do not understand one area. Why borneX$*$ y and $+$ x $?$ Why $+$ x $?$ Why no borne $\backslash ($ Y$^\{\backslash$star$\}$ x$+$y $\backslash )?$ Can you please kindly help me and explain to me $?$ Step $1$: Calculate the Shifted Index $($nb$)$

$1|$ nb $=$ int$($borneX $*\backslash ($ y$+$x$+\backslash )$ decalage$)\backslash \%$ nbPixels

Explanation:

$1.$ Including Position and Shift: The following function calculates the linear index of a pixel located at position $(\backslash ($ x$,$ y $\backslash ))$ of an image: borneX$*\backslash ($ y$+$x $\backslash )$ :$.$Decalage is the planned displacement. Sum these to get the new, shifted index.