In a spread, how can I use the center line as a boundary to determine whether an object is on the left or right page?

Question

Hello everyoneIn a spread, I want to use the center line as a boundary to distinguish between the following two cases:A. If the object’s left edge (sb[1]) is on the left side, regardless of sb[3], the object is considered to be on the left page.B. If the object’s left edge (sb[1]) is on the right side, regardless of sb[3], the object is considered to be on the right page.My ultimate goal is to decide whether they should move to the left or to the right.Thank you.var d = app.activeDocument;var s = d.selection[0]; p = s.parentPage;var sb = s.geometricBounds;var pb = p.bounds;lm = p.marginPreferences.left;rm = p.marginPreferences.right;

rob day · Accepted Answer

The reported geometricBounds of a selection depends on your rulerOrigin settings, so:

var d = app.activeDocument;
var s = d.selection[0]; 
d.viewPreferences.rulerOrigin = RulerOrigin.SPINE_ORIGIN
alert("Distance from spine: " + s.geometricBounds[1])
d.viewPreferences.rulerOrigin = RulerOrigin.PAGE_ORIGIN
alert("Distance from page start: " + s.geometricBounds[1])

rob day · Answer

Also, if you just want to know if the selection’s left edge is to the left of the spine then maybe:

var d = app.activeDocument;
//set rulers to spine origin
d.viewPreferences.rulerOrigin = RulerOrigin.SPINE_ORIGIN
var s = d.selection[0]; 
//left edge of selection
var l = s.geometricBounds[1]
//check left or right
if (l<0) {
	alert("Selection starts left of spine")
} else {
    alert("Selection starts right of spine")
}

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