# HOpCreateCylinder

## Functions

| `HOpCreateCylinder`
| `~HOpCreateCylinder`
char const * | `GetName`
int | `OnLButtonDown`
HBaseOperator * | `Clone`

## Detailed Description

class `HOpCreateCylinder` : public HOpConstructCylinder

  The HOpCreateCylinder class provides support for constructing a cylinder and inserting it into the model.

  HOpCreateCylinder implements four of the mouse button event handlers defined on the base class and maps the event information to local methods that rubberband a cylinder and insert a corresponding HOOPS shell into the HOOPS database. This provides the basic functionality for drawing a three-dimensional, tesselated cylinder with a circular base, a circular cap of equivalent size, and a number of rectangular, facetted sides with the default as 30. The operation consists of the following steps:

  1. Left Button Down: Register the center point of the cylinder base.
  2. Left Button Down and Drag: Rubberbands the circular base to the desired circumference.
  3. Left Button Up: The base circumference finalized.
  4. No Button Down and Drag: Rubberbands the cylinder to the desired height.
  5. Left Button Down: The height is finalized, a cylinder is inserted into the model and the operation ends.
  More Detailed Description: see event methods.

  Public Functions

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

    Constructs an HOpCreateCylinder 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 `~HOpCreateCylinder`()
  virtual char const *`GetName`()

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

  virtual int `OnLButtonDown`(HEventInfo &hevent)

    OnLButtonDown records the first pointer position and initiates the cylinder-drawing mechanism. The first point is used as the center of the cylinder’s circular base. If the drawing mechanism has already been started such as LButtonDown having been called once already, LButtonDown calls HUtilityGeometryCreation::CreateCylinder.

    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 HOpCreateCylinder object.

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