Can someone help me with a code bit. I know its a bit difficult since you cant see the whole code bit. but we are doing coding in visual studio code and i try to understand this code part what it does. i know it something with opacity to do but i dont really understand how it works. like why the specific math like

for x $"50)/(600-50)""$ and for y $"-35)/(425-35)"$

function getNodeData$()\{$

var data $=[]$;

for $($let i $=0$; i $<$ circleArrayNode.length; i$+=4)\{//$The loop iterates through the circleArrayNode array in increments of $4,$ suggesting that each set of $4$ consecutive elements corresponds to a single node

console.log$(399,$i$)$; $//$ CONSOLE

let opacityStart $=[$Math$.$round$(255*($circleArrayNode$[$i$].$x$-50)/(600-50)),$ Math.round$(255*(1-($circleArrayNode$[$i$].$y $-35)/(425-35)))]$;

let opacityEnd $=[$Math$.$round$(255*($circleArrayNode$[$i$+1].$x$-50)/(600-50)),$ Math.round$(255*(1-($circleArrayNode$[$i$+1].$y $-35)/(425-35)))]$;

let start $=$ Math.round$(255*($circleArrayNode$[$i$+2].$x$-50)/(600-50))$;

let end $=$ Math.round$(255*($circleArrayNode$[$i$+3].$x$-50)/(600-50))$;

let color $=$ hexToRgb$($circleArrayNode$[$i$].$color$)$;

console.log$($opacityStart$)//$ CONSOLE

data.push$(\{$opacityStart: opacityStart, opacityEnd: opacityEnd, start: start, end: end, color: color$\})$;

$\}$

return data;

$\}$

Because above this function $($ this funtion is like on row $1000$ or something$)$ we have anotehr function $($ on row $400$ ish$)$ that calls on it within it like this :

var nodeData $=$ getNodeData$()$;