## Introduction

Abstract class defined interface between widget and widget representation

## See also

[vtkHandleRepresentation]

## getPickedActor(x, y, z, picker)

Find the actor picked by the user (x, y, and z are display coordinate)

## adjustBounds(bounds, newBounds, center)

Recompute the `newBounds` from bounds, center and scale factor (class attributes)

## sizeHandlesInPixels(factor, pos)

Compute the size handles in pixels

## sizeHandlesRelativeToViewport

Compute the size handles relative to viewport