# ZOOMWHEEL System Variable [GstarCAD 2021](Help%20System/GSTARCAD/2021/Index.md) → [System Variables](Help%20System/GSTARCAD/2021/System%20Variables/(System%20Variables).md) → [Z](Help%20System/GSTARCAD/2021/System%20Variables/Z/(Z).md) **Function Description:** The ZOOMWHEEL system variable is used to switch the transparently zoom direction when scrolling the middle mouse wheel. | | | | --- | --- | | Type | Integer | | Saved in | Registry | | Initial value | 0 | | Range | 0,1 | **System Variable Value:** **0:** move wheel forward to zoom in; move wheel backwards to zoom out **1:** move wheel forward to zoom out; move wheel backwards to zoom in --- ## Other versions with matching text [GstarCAD 2016](../../../2016/System%20Variables/Z/ZOOMWHEEL%20System%20Variable--2ae88ab06979.md) · [GstarCAD 2017](Help%20System/GSTARCAD/2017/System%20Variables/Z/ZOOMWHEEL%20System%20Variable--2ae88ab06979.md) · [GstarCAD 2018](../../../2018/System%20Variables/Z/ZOOMWHEEL%20System%20Variable--2ae88ab06979.md) · [GstarCAD 2019](../../../2019/System%20Variables/Z/ZOOMWHEEL%20System%20Variable--2ae88ab06979.md) · [GstarCAD 2020](../../../2020/System%20Variables/Z/ZOOMWHEEL%20System%20Variable--2ae88ab06979.md) · [GstarCAD 2022](Help%20System/GSTARCAD/2022/System%20Variables/Z/ZOOMWHEEL%20System%20Variable--2ae88ab06979.md)