SMART datagrid v.1 > Classes > BarCellRenderer
显示竖条的起始位置。 
共有"top"、"bottom"、"left"、"right"等4种位置。
默认值为"left".
    var columns = [{
            name: "Quantity",
            fieldName: "quantity",
            width: 60,
            header: {
                "text": "Quantity"
            },
            renderer: {
                type: "bar",
                minimum: 0,
                maximum: 1000,
                origin: "right"
            }
        },
        ...
    ];
    grid.setColumns(columns);
}