Tiled JS script - Snap objects to pixel coordinates

gistfile1.txt

/**
 * Snap everything in the map to integer positions automatically when a map is saved.
 */


const actionName = "Integer Position Snap";
var action = tiled.registerAction(actionName, function (action) {

    let map = tiled.activeAsset;
    map.macro("Integer Position Snap", function () {

        const snapObjectsOnLayer = function (objectLayer) {
            {
                if (!objectLayer.isObjectLayer) {
                    return;
                }

                objectLayer.objects.forEach(obj => {
                    obj.x = Math.round(obj.x);
                    obj.y = Math.round(obj.y);
                    if (obj.width) {
                        obj.width = Math.round(obj.width);
                    }
                    if (obj.height) {
                        obj.height = Math.round(obj.height);
                    }
                    obj.pos = Qt.point(Math.round(obj.pos.x), Math.round(obj.pos.y));

                    if (obj.polygon && obj.polygon.length >= 1) {
                        obj.polygon = obj.polygon.map(p => Qt.point(Math.round(p.x), Math.round(p.y)));
                    }
                })
            }
        }

        const snapRecursive = function (layer) {

            if (layer.isObjectLayer) {
                snapObjectsOnLayer(layer);
            } else if (layer.isGroupLayer) {
                layer.layers.forEach(snapRecursive);
            }

        }

        map.layers.forEach(snapRecursive);
    });
});

action.text = actionName;

function checkIfActionNeeded(savedAsset) {
    if (!savedAsset.isTileMap) {
        return;
    }
    tiled.trigger(actionName);
}

tiled.assetAboutToBeSaved.connect(checkIfActionNeeded);