how to read the rotation of layer?

[dogeFu]

I read the readme_psd.md，failed to find where to get to rotaion of a layer,can you help me?

[Agamnentzar]

I don't think this value is stored anywhere in PSD file, it's calculated back from the transform (placedLayer.transform) that specifies location of 4 corners of transformation cage.

[zms664011036]

hello, transform= [12391.430367826988, 1721.516648354885, 2447.364078652975, 8802.809486322956, -70.25686706304622, 5075.064425643115, 9873.809422110964, -2006.2284123249551];) The four corners, how to calculate the rotation Angle, can provide the code to calculate the Angle?

The following is my code, but the calculation will be a little error, can you help me to see what went wrong?

const angle = getAngle({
x: 0,
y: img.height,
}, {
x: transform[6] - transform[0],
y: transform[7] - transform[1],
});

function getAngle({x: x1, y: y1}, {x: x2, y: y2}) {
const dot = x1 * x2 + y1 * y2
const det = x1 * y2 - y1 * x2
const angle = Math.atan2(det, dot) / Math.PI * 180
return angle
}