# UIGraphicsItem

class `pyqtgraph.``UIGraphicsItem`(bounds=None, parent=None)

  Base class for graphics items with boundaries relative to a GraphicsView or ViewBox. The purpose of this class is to allow the creation of GraphicsItems which live inside a scalable view, but whose boundaries will always stay fixed relative to the view’s boundaries. For example: GridItem, InfiniteLine

  The view can be specified on initialization or it can be automatically detected when the item is painted.

  NOTE: Only the item’s boundingRect is affected; the item is not transformed in any way. Use viewRangeChanged to respond to changes in the view.

  `__init__`(bounds=None, parent=None)

    Arguments: |
    bounds | QRectF with coordinates relative to view box. The default is QRectF(0,0,1,1), which means the item will have the same bounds as the view.

  `dataBounds`(axis, frac=1.0, orthoRange=None)

    Called by ViewBox for determining the auto-range bounds. By default, UIGraphicsItems are excluded from autoRange.

  `mouseShape`()

    Return the shape of this item after expanding by 2 pixels

  `setNewBounds`()

    Update the item’s bounding rect to match the viewport

  `viewRangeChanged`()

    Called when the view widget/viewbox is resized/rescaled