HOpConstructSphere

Detailed Description

class HOpConstructSphere : public HBaseOperator

The HOpConstructSphere class provides support for constructing a sphere and inserting it into the model.

HOpConstructSphere implements three of the mouse event handlers defined on the base class and maps the events to local methods that rubberband a sphere and insert a corresponding HOOPS shell into the HOOPS database. This provides the basic functionality for drawing a three-dimensional, tesselated sphere. The operation consists of the following steps:

  1. Left Button Down: Registers the center point of the sphere.
  2. Left Button Down and Drag: Rubberbands the sphere to the desired circumference.
  3. Left Button Up: Circumference is finalized, the scene is cleared and the operation ends.
More Detailed Description: see event methods.

Subclassed by HOpCreateSphere

Public Functions

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

Constructs an HOpConstructSphere 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 ~HOpConstructSphere()
virtual char const *GetName()
Returns:A pointer to a character string denoting the name of the operator which is ‘Construct Sphere’.
virtual int OnLButtonDown(HEventInfo &hevent)

OnLButtonDown records the first pointer position and initiates the sphere-drawing mechanism.

Parameters:hevent – An HEventInfo object containing information about the current event.
Returns:An HOperatorReturn indicating the status of the event.
virtual int OnLButtonDownAndMove(HEventInfo &hevent)

OnLButtonDownAndMove draws rubberbanded lines along the circumference of three great circles centered on the first pointer position: one equatorial, one along the prime meridian, and one 90-degrees from the prime meridian. Note that the basic dynamic drawing work is done by repeated calls to the protected function HOpConstructSphere::ConstructWireframeSphere.

Parameters:hevent – An HEventInfo object containing information about the current event.
Returns:An HOperatorReturn indicating the status of the event.
virtual int OnLButtonUp(HEventInfo &hevent)

OnLButtonUp finalizes the size of the sphere and cleans up.

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 HOpConstructSphere object.