# HOpMarkupCircle

## Functions

| `HOpMarkupCircle`
| `~HOpMarkupCircle`
char const * | `GetName`
int | `OnLButtonUp`
HBaseOperator * | `Clone`

## Detailed Description

class `HOpMarkupCircle` : public HOpConstructCircle

  The HOpMarkupCircle class inserts a 2D circle into a markup layer. If a layer is already active, then the operator will use that layer. Otherwise, the operator will create a new unnamed layer.

  HOpMarkupCircle implements three mouse event methods defined on the base class and maps the event information to operator routines. This operation consists of the following steps:

  1. Left Button Down: Registers the center point of the circle.
  2. Left Button Down and Drag: Creates a circle of appropriate radius in the contruction layer.
  3. Left Button Up: Depending on existence of an active markup layer it either opens the existing or creates a new markup layer and inserts appropraitely sized circle into it.
  More Detailed Description: see event methods.

  Public Functions

  `HOpMarkupCircle`(HBaseView *view, int DoRepeat = 0, int DoCapture = 1)

    Constructs an HOpMarkupCircle object.

    Parameters: | view – A pointer to an HBaseView object DoRepeat – An integer denoting whether this is a repeatable operator. This parameter has been deprecated. DoCapture – An integer denoting whether the mouse state should be captured, which means that all mouse events should be received after a mousedown, even if it leaves the window. This parameter has been deprecated.

  virtual `~HOpMarkupCircle`()
  virtual char const *`GetName`()

    Returns: | A pointer to a character string denoting the name of the operator, which is ‘HOpMarkupCircle’.

  virtual int `OnLButtonUp`(HEventInfo &hevent)

    OnLButtonUp maps circle information from HOpConstructCircle into the HOOPS routine HC_Compute_Selection_By_Area. This function also deselects any selected items that are not present in the current selection list.

    Parameters: | hevent – An HEventInfo object containing information about the current event.
    Returns: | An HOperatorReturn indicating the status of the event.

  virtual HBaseOperator *`Clone`()

    Creates a new operator which is a copy of the current operator. The user is responsible for deleting the newly created operator.

    Returns: | A pointer to the newly created HOpMarkupCircle object.

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