ArrowItem

class pyqtgraph.ArrowItem(parent=None, **opts)

For displaying scale-invariant arrows. For arrows pointing to a location on a curve, see CurveArrow

__init__(parent=None, **opts)

Arrows can be initialized with any keyword arguments accepted by the setStyle() method.

setStyle(**opts)

Changes the appearance of the arrow. All arguments are optional:

Keyword Arguments:
angle	Orientation of the arrow in degrees. Default is 0; arrow pointing to the left.
headLen	Length of the arrow head, from tip to base. default=20
headWidth	Width of the arrow head at its base. If headWidth is specified, it overrides tipAngle.
tipAngle	Angle of the tip of the arrow in degrees. Smaller values make a ‘sharper’ arrow. default=25
baseAngle	Angle of the base of the arrow head. Default is 0, which means that the base of the arrow head is perpendicular to the arrow tail.
tailLen	Length of the arrow tail, measured from the base of the arrow head to the end of the tail. If this value is None, no tail will be drawn. default=None
tailWidth	Width of the tail. default=3
pen	The pen used to draw the outline of the arrow.
brush	The brush used to fill the arrow.
pxMode	If True, then the arrow is drawn as a fixed size regardless of the scale of its parents (including the ViewBox zoom level).