Why rotating and translating a duplicated layers in a loop tend towards the center of the image?

Question

The code below should duplicate, rotate and translate layers at random positions on the screen each one in a loop with given iterations. Duplicating of layers is executed well, but rotation and translation is giving me very strange results, and that instead of rotating as well as translating randomly it tends to do that towards the center of the image:doc = app.activeDocument;

function random(min, max) {
	const num = Math.floor(Math.random() * (max - min + 1)) + min;
	return num;
};

function duplicateCurrentLayer(iter){
	for(i=0;i<iter;i++){
		doc.activeLayer.duplicate();
		doc.activeLayer.translate(random(-256,256),random(-256,256));
		doc.activeLayer.rotate(random(20,50),AnchorPosition.MIDDLECENTER);
	}
}

doc.suspendHistory("duplicate","duplicateCurrentLayer(30)");Please find the image belo as an example to see what I mean:  The first two duplicates are fine translated and rotated, but the others tend towards the center of the image. Thanks.

r-bin · Accepted Answer

You always move and rotate the same original layer. This spoils the image.

Also, according to the theory of probability (I cannot prove it), it will often return to its original position.

Units of measure are not specified for you. The behavior of the script also depends on this.

Check out this code.

doc = app.activeDocument;

function random(min, max) {
    const num = Math.floor(Math.random() * (max - min + 1)) + min;
    return num;
};

function duplicateCurrentLayer(iter){
    var layer0 = doc.activeLayer;    
    for(i=0;i<iter;i++){
        doc.activeLayer = layer0;
        var layer1 = doc.activeLayer.duplicate();
        doc.activeLayer = layer1;
        doc.activeLayer.translate(random(-256,256),random(-256,256));
        doc.activeLayer.rotate(random(20,50),AnchorPosition.MIDDLECENTER);
    }
}

doc.suspendHistory("duplicate","duplicateCurrentLayer(30)");

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