After Effectsで画像を等間隔に配置｜グリッドと端のすき間の違い

var names = ["画像_1", "画像_2", "画像_3", "画像_4", "画像_5", "画像_6"];
var control = thisComp.layer("adjust");
var columns = control.effect("列数")(1).value;
var pitchX = control.effect("横間隔")(1).value;
var pitchY = control.effect("縦間隔")(1).value;
var result = value;
var order = -1;
for (var i = 0; i < names.length; i++) if (names[i] == thisLayer.name) order = i;
if (order >= 0 && isFinite(columns) && columns >= 1 &&
        isFinite(pitchX) && pitchX > 0 && isFinite(pitchY) && pitchY > 0) {
    columns = Math.min(names.length, Math.floor(columns));
    var rows = Math.ceil(names.length / columns);
    var col = order % columns;
    var row = Math.floor(order / columns);
    var x = thisComp.width / 2 + (col - (columns - 1) / 2) * pitchX;
    var y = thisComp.height / 2 + (row - (rows - 1) / 2) * pitchY;
    result = [x, y];
}
result;

var names = ["画像_1", "画像_2", "画像_3", "画像_4", "画像_5", "画像_6"];
var gap = 40;
var result = value;
var order = -1;
var widths = [];
var total = gap * (names.length - 1);
for (var i = 0; i < names.length; i++) {
    if (names[i] == thisLayer.name) order = i;
    var layer = thisComp.layer(names[i]);
    widths[i] = layer.width * Math.abs(layer.scale[0]) / 100;
    total += widths[i];
}
if (order >= 0 && gap >= 0) {
    var x = thisComp.width / 2 - total / 2;
    for (var j = 0; j < order; j++) x += widths[j] + gap;
    result = [x + widths[order] / 2, thisComp.height / 2];
}
result;