Computer graphics

Detailed Description

Classes and functions to support miscellaneous pixel operations.


Classes

class  CVD::Brezenham
 Class to implement the Bresenham line-drawing algorithm. More...
class  CVD::Brezenham8
 Class to implement the Bresenham line-drawing algorithm. More...
struct  CVD::color< T, N >
 traits type defining colors for pixel types More...
struct  CVD::color< T, 1 >
 traits type defining colors for pixel types. More...
struct  CVD::color< T, 3 >
 traits type defining colors for pixel types. More...

Typedefs

typedef Brezenham CVD::Bresenham
typedef Brezenham8 CVD::Bresenham8

Functions

template<class T>
void CVD::drawLine (Image< T > &im, double x1, double y1, double x2, double y2, const T &c)
template<class T>
void CVD::drawLine (Image< T > &im, const ImageRef &p1, const ImageRef &p2, const T &c)
template<class T>
void CVD::drawLine (Image< T > &im, const TooN::Vector< 2 > &p1, const TooN::Vector< 2 > &p2, const T &c)
template<class T>
void CVD::drawShape (Image< T > &im, const ImageRef &offset, const std::vector< ImageRef > &points, const T &c)
template<class T>
void CVD::drawBox (Image< T > &im, const ImageRef &upperleft, const ImageRef &lowerright, const T &c)
template<class T>
void CVD::drawCross (Image< T > &im, const ImageRef &p, double len, const T &c)
std::vector< ImageRef > CVD::getCircle (int radius)
std::vector< ImageRef > CVD::getDisc (float radius)
template<class S, class T, class U>
void CVD::joinImages (const Image< S > &a, const Image< T > &b, Image< U > &J)
template<class S, class T, class U>
void CVD::combineImages (const Image< S > &a, const Image< T > &b, Image< U > &out, const ImageRef &dst=ImageRef_zero, ImageRef size=ImageRef(), const ImageRef &from=ImageRef_zero)

Typedef Documentation

typedef Brezenham CVD::Bresenham

Alternative (and correct) spelling for this object.

Definition at line 30 of file bresenham.h.

typedef Brezenham8 CVD::Bresenham8

Alternative (and correct) spelling for this object.

Definition at line 33 of file bresenham.h.

Function Documentation

template<class T>
void CVD::drawLine ( Image< T > &  im,
double  x1,
double  y1,
double  x2,
double  y2,
const T &  c 
) [inline]

draws a line defined by start and end coordinates with given color into an image.

Parameters:
im image to draw in
x1 x coordinate of start point
y1 y coordinate of start point
x2 x coordinate of end point
y2 y coordinate of end point
c color of the line

Definition at line 127 of file draw.h.

References CVD::abs(), CVD::SubImage< T >::size(), CVD::ImageRef::x, and CVD::ImageRef::y.

Referenced by CVD::drawBox(), CVD::drawCross(), CVD::drawLine(), and CVD::drawShape().

template<class T>
void CVD::drawLine ( Image< T > &  im,
const ImageRef &  p1,
const ImageRef &  p2,
const T &  c 
) [inline]

draws a line defined by two ImageRef with given color into an image.

Parameters:
im image to draw in
p1 start point
p2 end point
c color of the line

Definition at line 149 of file draw.h.

References CVD::drawLine(), CVD::ImageRef::x, and CVD::ImageRef::y.

template<class T>
void CVD::drawLine ( Image< T > &  im,
const TooN::Vector< 2 > &  p1,
const TooN::Vector< 2 > &  p2,
const T &  c 
) [inline]

draws a line defined by two TooN::Vector<2> with given color into an image.

Parameters:
im image to draw in
p1 start point
p2 end point
c color of the line

Definition at line 162 of file draw.h.

References CVD::drawLine().

template<class T>
void CVD::drawShape ( Image< T > &  im,
const ImageRef &  offset,
const std::vector< ImageRef > &  points,
const T &  c 
) [inline]

draws a polyline defined by a set of points into an image.

A given offset is added to all points.

Parameters:
im image to draw in
offset added to all points
points vector containing points
c color of the line

Definition at line 178 of file draw.h.

References CVD::drawLine().

template<class T>
void CVD::drawBox ( Image< T > &  im,
const ImageRef &  upperleft,
const ImageRef &  lowerright,
const T &  c 
) [inline]

draws a box defined by the upper left and the lower right corners into an image

Parameters:
im image to draw in
upperleft ImageRef of upper left corner
lowerright ImageRef of lower right corner
c color of the box

Definition at line 192 of file draw.h.

References CVD::drawLine(), CVD::ImageRef::x, and CVD::ImageRef::y.

template<class T>
void CVD::drawCross ( Image< T > &  im,
const ImageRef &  p,
double  len,
const T &  c 
) [inline]

draws a cross defined by center point and length of the arms into an image

Parameters:
im image to draw in
p center point
len arm length
c color of the box

Definition at line 207 of file draw.h.

References CVD::drawLine(), CVD::ImageRef::x, and CVD::ImageRef::y.

std::vector<ImageRef> CVD::getCircle ( int  radius  ) 

returns coordinate for a circle of given radius around the origin.

The result can be used with drawShape to draw it into an image.

Parameters:
radius radius of the circle in pixels
Returns:
vector containig ImageRef for the circle

std::vector<ImageRef> CVD::getDisc ( float  radius  ) 

returns coordinate for a disc of given radius around the origin.

The result can be used with drawShape to draw it into an image.

Parameters:
radius radius of the circle in pixels
Returns:
vector containig ImageRef for the circle

template<class S, class T, class U>
void CVD::joinImages ( const Image< S > &  a,
const Image< T > &  b,
Image< U > &  J 
) [inline]

joins two images side-by-side to create a larger image, any remaining empty region will be blacked out

Parameters:
a input image a to copy from
b input image b to copy from
J resulting joint image

Definition at line 234 of file draw.h.

References CVD::copy(), CVD::Image< T >::resize(), CVD::SubImage< T >::size(), CVD::ImageRef::x, and CVD::ImageRef::y.

template<class S, class T, class U>
void CVD::combineImages ( const Image< S > &  a,
const Image< T > &  b,
Image< U > &  out,
const ImageRef &  dst = ImageRef_zero,
ImageRef  size = ImageRef(),
const ImageRef &  from = ImageRef_zero 
) [inline]

similar to copy but combines values from two source images into the output image.

In the current implementation it simply adds the pixel values of two input images together and writes them into the output image.

Parameters:
a input image a to copy from
b input image b to copy from
out resulting combined image

Definition at line 259 of file draw.h.

References CVD::copy(), CVD::SubImage< T >::in_image(), CVD::ImageRef::next(), CVD::SubImage< T >::size(), CVD::ImageRef::x, and CVD::ImageRef::y.

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