Visualization Library 2.0.0-b3

A lightweight C++ OpenGL middleware for 2D/3D graphics

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vl::BezierPatch Class Reference

Defines one or more concatenated bicubic Bézier patches to be used with the BezierSurface class. More...

#include <BezierSurface.hpp>

+ Inheritance diagram for vl::BezierPatch:

Public Types

typedef std::vector< vec3Points
 The control points grid defining the bicubic Bézier patch(es). More...
 

Public Member Functions

 BezierPatch ()
 Constructor. More...
 
 BezierPatch (int x, int y)
 Constructor. More...
 
void resize (int x, int y)
 Defines the x and y dimensions of the control point grid defining the patch. More...
 
int x () const
 Returns the x dimension of the patch as specified by resize(). More...
 
int y () const
 Returns the y dimension of the patch as specified by resize(). More...
 
Pointspoints ()
 The control points grid defining the bicubic Bézier patch(es). More...
 
const Pointspoints () const
 The control points grid defining the bicubic Bézier patch(es). More...
 
vec3at (int i, int j)
 Returns the i/j control point. More...
 
const vec3at (int i, int j) const
 Returns the i/j control point. More...
 
- Public Member Functions inherited from vl::Object
 Object ()
 Constructor. More...
 
 Object (const Object &other)
 Copy constructor: copies the name, ref count mutex and user data. More...
 
Objectoperator= (const Object &other)
 Copy operator: copies the object's name, ref count mutex and user data. More...
 
const std::string & objectName () const
 The name of the object, by default set to the object's class name. More...
 
void setObjectName (const char *name)
 The name of the object, by default set to the object's class name in debug builds. More...
 
void setObjectName (const std::string &name)
 The name of the object, by default set to the object's class name in debug builds. More...
 
void setRefCountMutex (IMutex *mutex)
 The mutex used to protect the reference counting of an Object across multiple threads. More...
 
IMutexrefCountMutex ()
 The mutex used to protect the reference counting of an Object across multiple threads. More...
 
const IMutexrefCountMutex () const
 The mutex used to protect the reference counting of an Object across multiple threads. More...
 
int referenceCount () const
 Returns the number of references of an object. More...
 
void incReference () const
 Increments the reference count of an object. More...
 
void decReference ()
 Decrements the reference count of an object and deletes it if both automaticDelete() is true the count reaches 0. More...
 
void setAutomaticDelete (bool autodel_on)
 If set to true the Object is deleted when its reference count reaches 0. More...
 
bool automaticDelete () const
 If set to true the Object is deleted when its reference count reaches 0. More...
 
template<class T >
T * as ()
 Casts an Object to the specified class. More...
 
template<class T >
const T * as () const
 Casts an Object to the specified class. More...
 

Protected Attributes

Points mControlPoints
 
int mX
 
int mY
 
- Protected Attributes inherited from vl::Object
std::string mObjectName
 
IMutexmRefCountMutex
 
int mReferenceCount
 
bool mAutomaticDelete
 

Additional Inherited Members

- Protected Member Functions inherited from vl::Object
virtual ~Object ()
 

Detailed Description

Defines one or more concatenated bicubic Bézier patches to be used with the BezierSurface class.

See also:

Definition at line 44 of file BezierSurface.hpp.

Member Typedef Documentation

◆ Points

typedef std::vector< vec3 > vl::BezierPatch::Points

The control points grid defining the bicubic Bézier patch(es).

Definition at line 50 of file BezierSurface.hpp.

Constructor & Destructor Documentation

◆ BezierPatch() [1/2]

vl::BezierPatch::BezierPatch ( )
inline

Constructor.

Definition at line 52 of file BezierSurface.hpp.

◆ BezierPatch() [2/2]

vl::BezierPatch::BezierPatch ( int  x,
int  y 
)
inline

Constructor.

Definition at line 57 of file BezierSurface.hpp.

Member Function Documentation

◆ at() [1/2]

vec3& vl::BezierPatch::at ( int  i,
int  j 
)
inline

Returns the i/j control point.

Definition at line 74 of file BezierSurface.hpp.

Referenced by vl::BezierSurface::updateBezierSurface().

◆ at() [2/2]

const vec3& vl::BezierPatch::at ( int  i,
int  j 
) const
inline

Returns the i/j control point.

Definition at line 76 of file BezierSurface.hpp.

◆ points() [1/2]

Points& vl::BezierPatch::points ( )
inline

The control points grid defining the bicubic Bézier patch(es).

Definition at line 70 of file BezierSurface.hpp.

Referenced by vl::makeTeapot().

◆ points() [2/2]

const Points& vl::BezierPatch::points ( ) const
inline

The control points grid defining the bicubic Bézier patch(es).

Definition at line 72 of file BezierSurface.hpp.

◆ resize()

void BezierPatch::resize ( int  x,
int  y 
)

Defines the x and y dimensions of the control point grid defining the patch.

The x and y parameters must be of the form 3*n+1 with n integer positive, i.e 4 (n=1), 7 (n=2), 10 (n=3) and so on.

- The simplest bicubic Bézier patch requires 4x4 = 16 control points: A, B, C, D, E, F, G, H, I, L, M, N, O, P, Q, R
- The Bézier surface is guaranteed to touch only the 4 corner control points A, D, O and R.

A---B---C---D
|   |   |   |
E---F---G---H
|   |   |   |
I---L---M---N
|   |   |   |
O---P---Q---R

In this case we would call "resize(4,4)"

- You can concatenate two bicubic Bézier patches to form a larger suface by sharing their control points like this:

   patch 1     patch 2
A---+---+---B---+---+---G
|   |   |   |   |   |   |
+---+---+---C---+---+---+
|   |   |   |   |   |   |
+---+---+---D---+---+---+
|   |   |   |   |   |   |
F---+---+---E---+---+---H

In this case we would call "resize(7,4)"

- In this case the two patches share the control points B, C, D and E.
- As we can see the total control points needed are 28 = (2 (patches along x) * 3 + 1) * (1 (patches along y) * 3 + 1)
- Also in this case the Bézier surface is guaranteed to touch only the 6 corner control points A, B, E, F, G and H.

Definition at line 70 of file BezierSurface.cpp.

References vl::Log::error(), mControlPoints, mX, mY, VL_CHECK, x(), and y().

◆ x()

int vl::BezierPatch::x ( ) const
inline

Returns the x dimension of the patch as specified by resize().

Definition at line 66 of file BezierSurface.hpp.

Referenced by resize(), and vl::BezierSurface::updateBezierSurface().

◆ y()

int vl::BezierPatch::y ( ) const
inline

Returns the y dimension of the patch as specified by resize().

Definition at line 68 of file BezierSurface.hpp.

Referenced by resize(), and vl::BezierSurface::updateBezierSurface().

Member Data Documentation

◆ mControlPoints

Points vl::BezierPatch::mControlPoints
protected

Definition at line 78 of file BezierSurface.hpp.

Referenced by resize().

◆ mX

int vl::BezierPatch::mX
protected

Definition at line 79 of file BezierSurface.hpp.

Referenced by resize().

◆ mY

int vl::BezierPatch::mY
protected

Definition at line 80 of file BezierSurface.hpp.

Referenced by resize().


The documentation for this class was generated from the following files: