HandleInfo Class Reference

#include <c4d_objectdata.h>

Detailed Description

Class holding the information for object handles.

The handle system has been changed in such a way that handles must travel with the mouse.
The system tries to help automate the placement of the handles. It calculates the correct handle positions and constrains the handle.
The values of HandleInfo are typically set in ObjectData::GetHandle by the user.
Here is the internal code of the ObjectData::DetectHandle and ObjectData::MoveHandle methods:

Int32 ObjectData::DetectHandle(BaseObject *op, BaseDraw *bd, Int32 x, Int32 y, QUALIFIER qualifier)
{
  if (qualifier & QUALIFIER::CTRL)
    return NOTOK;
 
  Matrix mg = op->GetMg();
  Int32 i, ret = NOTOK;
 
  for (i=0; i<GetHandleCount(op); i++)
  {
    HandleInfo info;
    GetHandle(op,i, info);
    if (info.type == HANDLECONSTRAINTTYPE::INVALID)
      continue;
 
    if (bd->PointInRange(info.position*mg, x, y))
    {
      ret = i;
      if (!(qualifier&QUALIFIER::SHIFT))
        break;
    }
  }
  return ret;
}
 
Bool ObjectData::MoveHandle( BaseObject *op, BaseObject *undo, const Vector &mouse_pos, Int32 hit_id, QUALIFIER qualifier, BaseDraw *bd )
{
  Matrix mg = op->GetUpMg() * undo->GetMl();
  HandleInfo info;
 
  undo->GetNodeData<ObjectData>()->GetHandle(undo,hit_id,info);
  SetHandle(op,hit_id,info.CalculateNewPosition(bd, mg, mouse_pos),info);
 
  return true;
}

Here is code from the DoubleCircle SDK example that shows the implementation of the automated handle interface functions:

Int32 DoubleCircleData::GetHandleCount(BaseObject *op)
{
  return 1;
}
 
void DoubleCircleData::GetHandle(BaseObject *op, Int32 i, HandleInfo &info)
{
  BaseContainer *data = op->GetDataInstance();
  if (!data)
    return;
 
  Float rad = data->GetFloat(CIRCLEOBJECT_RAD);
  Int32 plane = data->GetInt32(PRIM_PLANE);
 
  info.position = SwapPoint(Vector(rad, 0.0, 0.0),plane);
  info.direction = !SwapPoint(Vector(1.0, 0.0, 0.0),plane);
  info.type = HANDLECONSTRAINTTYPE::LINEAR;
}
 
void DoubleCircleData::SetHandle(BaseObject *op, Int32 i, Vector p, const HandleInfo &info)
{
  BaseContainer *data = op->GetDataInstance();
  if (!data)
    return;
 
  Float val = Dot(p, info.direction);
  data->SetFloat(CIRCLEOBJECT_RAD, ClampValue(val, 0.0_f, (Float)MAXRANGE));
}

Public Member Functions
	HandleInfo ()
	~HandleInfo ()
Vector	CalculateNewPosition (BaseDraw *bd, const Matrix &mg, const Vector &mouse_pos) const

Public Attributes
Vector	position
Vector	direction
Vector	center
Float	radius
HANDLECONSTRAINTTYPE	type

Constructor & Destructor Documentation

HandleInfo()

HandleInfo

(

)

Constructor.

~HandleInfo()

~HandleInfo

(

)

Destructor.

Member Function Documentation

CalculateNewPosition()

Vector CalculateNewPosition	(	BaseDraw *	bd,
		const Matrix &	mg,
		const Vector &	mouse_pos
	)		const

Calculates a handle position for the given mouse position.

Parameters

[in]	bd	The editor's view. The caller owns the pointed view.
[in]	mg	The global matrix of the handle's parent object.
[in]	mouse_pos	The mouse coordinates for which to calculate the handle position.

Returns

The new handle position.

Member Data Documentation

position

Vector position

The handle position.

direction

Vector direction

The normal used for the handle travel. For linear handle constraints it is the line on which a handle can travel. For planar and radial constraints it is the normal of the plane/disc. Otherwise it is not needed.

center

Vector center

The handle constraint center, for radial and spherical handle constraints.

radius

Float radius

The handle constraint radius, for radial and spherical handle constraints.

type

HANDLECONSTRAINTTYPE type

The handle constraint type: HANDLECONSTRAINTTYPE.