HOpCreateCircle

Detailed Description

class HOpCreateCircle : public HOpConstructCircle

The HOpCreateCircle class draws a circle.

HOpCreateCircle maps the event information to the HOOPS routine #HC_Insert_Circle_By_Radius. This provides the basic functionality for drawing a temporary, overlayed 2-D box outline in the view plane based on first and last pointer positions. Once the operation is finalized, a circle will be inserted into the model. The operation consists of the following steps:

  1. Left Button Down: Identifies the center point of the circle.
  2. Left Button Down and Drag: Rubberband circle to desired dimensions.
  3. Left Button Up: Circle finalized, the polyline primitive used to represent the circle is flushed from the scene and a new one is created in the model.
More Detailed Description: see event methods.

Public Functions

HOpCreateCircle(HBaseView *view, int DoRepeat = 0, int DoCapture = 1, bool UseCenterMarker = true)

Constructs an HOpCreateCircle 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.
  • UseCenterMarker – Pass true if you want HOOPS to draw a mark at the center.
virtual ~HOpCreateCircle()
virtual char const *GetName()
Returns:A pointer to a character string denoting the name of the operator, which is ‘HOpConstructCircle’.
virtual int OnLButtonUp(HEventInfo &hevent)

OnLButtonUp finalizes the size of the circle, cleans up the geometry draw under the construction key and inserts a circle into the current model using #HC_Insert_Circle_By_Radius.

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 HOpCreateCircle object.