KineticJS更改对象的坐标

我不明白为什么会有微分位移结果。多边形和文本均匀移动，线相对误差多边形移动。

    function setNewPosition(x, y) {
                var lines = stage.find('Line');
                if (lines.length > 0) {
                    lines.forEach(function inLines(line) {
                        var points = line.getPoints();
                        if (points.length > 0) {
                            points.forEach(function pSet(p) {
                                p.x += x;
                                p.y += y;
                            });
                        }
                    });
                };
                polygons = stage.find('Polygon');
                if (polygons.length > 0) {
                    polygons.forEach(function inPoly(polygon) {
                        var points = polygon.getPoints();
                        if (points.length > 0) {
                            points.forEach(function pSet(p) {
                                p.x += x;
                                p.y += y;
                            });
                        }
                    });
                };
                texts = stage.find('Text');
                if (texts.length > 0)
                    texts.forEach(function inText(text) {
                        oX = text.getX();
                        oY = text.getY();
                        text.setX(oX + x);
                        text.setY(oY + y);
                    }
                );
               layer.draw();
            }