Visualization Library v1.0.3

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

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Public Types | Public Member Functions | Protected Attributes

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:
vl::Object

List of all members.

Public Types

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

Public Member Functions

 BezierPatch ()
 Constructor.
 BezierPatch (int x, int y)
 Constructor.
void resize (int x, int y)
 Defines the x and y dimensions of the control point grid defining the patch.
int x () const
 Returns the x dimension of the patch as specified by resize().
int y () const
 Returns the y dimension of the patch as specified by resize().
Pointspoints ()
 The control points grid defining the bicubic Bézier patch(es).
const Pointspoints () const
 The control points grid defining the bicubic Bézier patch(es).
vec3at (int i, int j)
 Returns the i/j control point.
const vec3at (int i, int j) const
 Returns the i/j control point.

Protected Attributes

Points mControlPoints
int mX
int mY

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

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

vl::BezierPatch::BezierPatch (  ) [inline]

Constructor.

Definition at line 52 of file BezierSurface.hpp.

References VL_DEBUG_SET_OBJECT_NAME.

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

Constructor.

Definition at line 57 of file BezierSurface.hpp.

References VL_DEBUG_SET_OBJECT_NAME.


Member Function Documentation

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().

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().

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().

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

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

Definition at line 70 of file BezierSurface.hpp.

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.

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().

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.


Member Data Documentation

Definition at line 78 of file BezierSurface.hpp.

Referenced by resize().

int vl::BezierPatch::mX [protected]

Definition at line 79 of file BezierSurface.hpp.

Referenced by resize().

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:

Visualization Library v1.0.3 Reference Documentation
Copyright Michele Bosi. All rights reserved.
Updated on Tue Feb 7 2017 00:55:09.
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