Rotate the selected layer according to the layer below

Question

First fit the selected layer according to the layer below then rotate the selected layer according to the position the layer below is rotated.

// Set ruler units to pixels
var oldPref = app.preferences.rulerUnits;
app.preferences.rulerUnits = Units.PIXELS;

// Get active document and layers
var doc = activeDocument;
var iLayer = doc.activeLayer;

// Function to select the layer below
function layerDown() {
var idslct = charIDToTypeID("slct");
var desc2 = new ActionDescriptor();
var idnull = charIDToTypeID("null");
var ref1 = new ActionReference();
var idLyr = charIDToTypeID("Lyr ");
var idOrdn = charIDToTypeID("Ordn");
var idBckw = charIDToTypeID("Bckw");
ref1.putEnumerated(idLyr, idOrdn, idBckw);
desc2.putReference(idnull, ref1);
executeAction(idslct, desc2, DialogModes.NO);
}

// Call the function to select the layer below
layerDown();

// Get the bounds of the layer below
var mLayerB = doc.activeLayer.bounds;

// Fit the selected layer according to the layer below
var scale = Math.max((mLayerB[2] - mLayerB[0]) / (iLayer.bounds[2] - iLayer.bounds[0]), (mLayerB[3] - mLayerB[1]) / (iLayer.bounds[3] - iLayer.bounds[1]));
iLayer.resize(scale * 100, scale * 100);
iLayer.translate((mLayerB[0] + mLayerB[2]) / 2 - (iLayer.bounds[0] + iLayer.bounds[2]) / 2, (mLayerB[1] + mLayerB[3]) / 2 - (iLayer.bounds[1] + iLayer.bounds[3]) / 2);

// Function to get the rotation angle of a layer
function getLayerRotation(layer) {
var idslct = charIDToTypeID("slct");
var desc = new ActionDescriptor();
var ref = new ActionReference();
ref.putEnumerated(charIDToTypeID("Lyr "), charIDToTypeID("Ordn"), charIDToTypeID("Trgt"));
desc.putReference(charIDToTypeID("null"), ref);
var result = executeAction(charIDToTypeID("getd"), desc, DialogModes.NO);

var rotation = 0;
if (result.hasKey(stringIDToTypeID("transform"))) {
var transform = result.getObjectValue(stringIDToTypeID("transform"));
if (transform.hasKey(stringIDToTypeID("rotation"))) {
rotation = transform.getDouble(stringIDToTypeID("rotation"));
}
}
return rotation;
}

// Get the rotation of the layer below
var mLayerRotation = getLayerRotation(doc.activeLayer);

// Function to rotate the layer
function rotateLayer(layer, angle) {
var idtrns = charIDToTypeID("Trnf");
var desc = new ActionDescriptor();
var idnull = charIDToTypeID("null");
var ref = new ActionReference();
ref.putEnumerated(charIDToTypeID("Lyr "), charIDToTypeID("Ordn"), charIDToTypeID("Trgt"));
desc.putReference(idnull, ref);

var idtarg = charIDToTypeID("TlrP");
var desc2 = new ActionDescriptor();
desc2.putUnitDouble(charIDToTypeID("Angl"), charIDToTypeID("#Ang"), angle);
desc.putObject(idtarg, idtrns, desc2);

executeAction(idtrns, desc, DialogModes.NO);
}

// Rotate the selected layer to match the layer below
rotateLayer(iLayer, mLayerRotation);

// Restore the original ruler units
app.preferences.rulerUnits = oldPref;

c.pfaffenbichler · Accepted Answer

https://youtu.be/QZoYYLSABVs?si=kJf1onjcRinp007W

Sir this is a common problem. This problem occurs because the layer height size and layer width size are not fixed. Space is left above and below the level. The level does not fit. This space should not be left. The top and bottom layers should fit. It doesn't matter if the left and right sides of the side don't fit.

// rotate, scale and move layer according to smart object immediately below;
// 2024, use it at your own risk;
if (app.documents.length > 0) {
var originalRulerUnits = app.preferences.rulerUnits;
app.preferences.rulerUnits = Units.PIXELS;
// check for background layer;
var ref = new ActionReference();
ref.putEnumerated( charIDToTypeID("Dcmn"), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") );
var desc = executeActionGet(ref);
if (desc.getBoolean(stringIDToTypeID("hasBackgroundLayer")) == true) {var theAdd = -1}
else {var theAdd = 0};
// get the index;
var ref = new ActionReference();
ref.putEnumerated( charIDToTypeID("Lyr "), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") ); 
var layerDesc = executeActionGet(ref);
var theIndex = layerDesc.getInteger(stringIDToTypeID('itemIndex'));
var theID = layerDesc.getInteger(stringIDToTypeID('layerID'));
// the angles;
var currentAngle = getAngleOfLayer ();
selectLayerByIndex(theIndex + theAdd - 1, false);
var theAngle = getAngleOfLayer ();
selectLayerByIndex(theIndex + theAdd, false);
if (currentAngle != undefined && theAngle != undefined) {
// determine scale:
if (theAngle[3]/theAngle[4] > currentAngle[3]/currentAngle[4]) {
var theScale = theAngle[3]/currentAngle[3]*100
} else {
var theScale = theAngle[4]/currentAngle[4]*100
};
// rotate;
layerDuplicateScaleRotate (theID, false, theAngle[1] - currentAngle[1], theAngle[2] - currentAngle[2], theScale, theScale, theAngle[0] - currentAngle[0]);
};
// reset;
app.preferences.rulerUnits = originalRulerUnits;
};
////////////////////////////////////
////// get angle //////
function getAngleOfLayer () {
try {
var ref = new ActionReference();
ref.putEnumerated( charIDToTypeID("Lyr "), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") ); 
var layerDesc = executeActionGet(ref);
var theName = layerDesc.getString(stringIDToTypeID('name'));
var soDesc = layerDesc.getObjectValue(stringIDToTypeID('smartObject'));
var soMoreDesc = layerDesc.getObjectValue(stringIDToTypeID('smartObjectMore'));
var placedDesc = soDesc.getEnumerationValue(stringIDToTypeID('placed'));
var theFileRef = soDesc.getString(stringIDToTypeID('fileReference'));
var theDocID = soDesc.getString(stringIDToTypeID('documentID'));
var size = soMoreDesc.getObjectValue(stringIDToTypeID('size'));
var transform = soMoreDesc.getList(stringIDToTypeID("transform"));
var xx = new Array;
for (var m = 0; m < transform.count; m++) {
xx.push(transform.getDouble(m))
};
var nonAffineTransform = soMoreDesc.getList(stringIDToTypeID("nonAffineTransform"));
var yy = new Array;
for (var n = 0; n < nonAffineTransform.count; n++) {
yy.push(nonAffineTransform.getDouble(n))
};
var theX = yy[0] + (yy[4] - yy[0])/2;
var theY = yy[1] + (yy[5] - yy[1])/2;
var theWidth = getDistance([yy[0], yy[1]], [yy[2], yy[3]]);
var theHeight = getDistance([yy[0], yy[1]], [yy[6], yy[7]]);
return [getAngle([yy[6], yy[7]], [yy[4], yy[5]]), theX, theY, theWidth, theHeight]
} catch (e) {return undefined}
};
////// radians //////
function radiansOf (theAngle) {
return theAngle * Math.PI / 180
};
////// get an angle, 3:00 being 0˚, 6:00 90˚, etc. //////
function getAngle (pointOne, pointTwo) {
// calculate the triangle sides;
var width = pointTwo[0] - pointOne[0];
var height = pointTwo[1] - pointOne[1];
var sideC = Math.sqrt(Math.pow(width, 2) + Math.pow(height, 2)); 
// calculate the angles;
if (width+width > width) {theAngle = Math.asin(height / sideC) * 360 / 2 / Math.PI}
else {theAngle = 180 - (Math.asin(height / sideC) * 360 / 2 / Math.PI)};
if (theAngle < 0) {theAngle = (360 + theAngle)};
//	if (theAngle > 180) {theAngle = (360 - theAngle) * (-1)};
return theAngle
};
// by mike hale, via paul riggott;
function selectLayerByIndex(index,add){ 
try{
add = undefined ? add = false:add 
var ref = new ActionReference();
ref.putIndex(charIDToTypeID("Lyr "), index);
var desc = new ActionDescriptor();
desc.putReference(charIDToTypeID("null"), ref );
if(add) desc.putEnumerated( stringIDToTypeID( "selectionModifier" ), stringIDToTypeID( "selectionModifierType" ), stringIDToTypeID( "addToSelection" ) ); 
desc.putBoolean( charIDToTypeID( "MkVs" ), false ); 
//try{
executeAction(charIDToTypeID("slct"), desc, DialogModes.NO );
}catch(e){
alert(e.message); 
}
};
////// duplicate layer (id, xOffset, yOffset, theXScale, theYScale, theAngle) //////
function layerDuplicateScaleRotate (theID, theDuplicate, xOffset, yOffset, theXScale, theYScale, theAngle) {
// based on code by mike hale, via paul riggott;
var ref = new ActionReference();
ref.putIdentifier(charIDToTypeID("Lyr "), theID);
var desc = new ActionDescriptor();
desc.putReference(charIDToTypeID("null"), ref );
desc.putBoolean( charIDToTypeID( "MkVs" ), false ); 
try{
executeAction(charIDToTypeID("slct"), desc, DialogModes.NO );
}catch(e){
alert(e.message); 
};
// =======================================================
var desc23 = new ActionDescriptor();
var idnull = charIDToTypeID( "null" );
var ref2 = new ActionReference();
ref2.putIdentifier ( charIDToTypeID( "Lyr " ), theID );
//        ref2.putEnumerated( charIDToTypeID( "Lyr " ), charIDToTypeID( "Ordn" ), charIDToTypeID( "Trgt" ) );
desc23.putReference( idnull, ref2 );
desc23.putEnumerated( charIDToTypeID( "FTcs" ), charIDToTypeID( "QCSt" ), charIDToTypeID( "Qcsa" ) );
var idOfst = charIDToTypeID( "Ofst" );
var desc24 = new ActionDescriptor();
var idPxl = charIDToTypeID( "#Pxl" );
desc24.putUnitDouble( charIDToTypeID( "Hrzn" ), idPxl, xOffset );
desc24.putUnitDouble( charIDToTypeID( "Vrtc" ), idPxl, yOffset );
var idOfst = charIDToTypeID( "Ofst" );
desc23.putObject( idOfst, idOfst, desc24 );
var idPrc = charIDToTypeID( "#Prc" );
desc23.putUnitDouble( charIDToTypeID( "Wdth" ), idPrc, theXScale );
desc23.putUnitDouble( charIDToTypeID( "Hght" ), idPrc, theYScale );
desc23.putUnitDouble( charIDToTypeID( "Angl" ), charIDToTypeID( "#Ang" ), theAngle );
desc23.putEnumerated( charIDToTypeID( "Intr" ), charIDToTypeID( "Intp" ), stringIDToTypeID( "bicubicAutomatic" ) );
desc23.putBoolean( charIDToTypeID( "Cpy " ), theDuplicate );
executeAction( charIDToTypeID( "Trnf" ), desc23, DialogModes.NO );
};
////// get a distance between two points //////
function getDistance (pointOne, pointTwo) {
// calculate the triangle sides;
var width = pointTwo[0] - pointOne[0];
var height = pointTwo[1] - pointOne[1];
var sideC = Math.sqrt(Math.pow(width, 2) + Math.pow(height, 2)); 
return sideC
};

c.pfaffenbichler · Answer

Could you please post screenshots with the pertinent Panels (Toolbar, Layers, Options Bar, …) visible?

Is the lower Layer a Smart Object? If it is not, but rather a plain pixel Layer, the concept of »rotation« would not apply because the Bounds define a rectangle with vertical and horicontal sides.

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