Detailed Description

This virtual class defines the interface of any object accepting drawing primitives on it.

A number of text fonts can be selected with CCanvas::selectTextFont(). These are the implemented font names:

"6x13"
"6x13B" (bold)
"6x13O" (italic)
"9x15"
"9x15B" (bold)
"10x20"
"18x18ja" (Japanese, UNICODE character values)

For an example of each font check the corresponding wiki page.

See also:: CImage

Definition at line 63 of file CCanvas.h.

#include <mrpt/utils/CCanvas.h>

Inheritance diagram for mrpt::utils::CCanvas:

[legend]

List of all members.

Public Types
enum	TPenStyle { psSolid = 0, psDash, psDot, psDashDot, psDashDotDot }
	Definition of pen styles. More...
Public Member Functions
	CCanvas ()
virtual	~CCanvas ()
	Dummy virtual destructor:
virtual void	setPixel (int x, int y, size_t color)=0
	Changes the value of the pixel (x,y).
virtual size_t	getWidth () const =0
	Returns the width of the image in pixels.
virtual size_t	getHeight () const =0
	Returns the height of the image in pixels.
virtual void	line (int x0, int y0, int x1, int y1, const mrpt::utils::TColor color, unsigned int width=1, TPenStyle penStyle=psSolid)
	Draws a line.
void	rectangle (int x0, int y0, int x1, int y1, const mrpt::utils::TColor color, unsigned int width=1)
	Draws a rectangle (an empty rectangle, without filling)
void	triangle (int x0, int y0, int size, const mrpt::utils::TColor color, bool inferior=true, unsigned int width=1)
	Draws a triangle.
virtual void	filledRectangle (int x0, int y0, int x1, int y1, const mrpt::utils::TColor color)
	Draws a filled rectangle.
virtual void	textOut (int x0, int y0, const std::string &str, const mrpt::utils::TColor color)
	Renders 2D text using bitmap fonts.
virtual void	selectTextFont (const std::string &fontName)
	Select the current font used when drawing text.
virtual void	drawImage (int x, int y, const utils::CImage &img)
	Draws an image as a bitmap at a given position.
void	cross (int x0, int y0, const mrpt::utils::TColor color, char type, unsigned int size=5, unsigned int width=1)
	Draw a cross.
virtual void	drawImage (int x, int y, const utils::CImage &img, float rotation, float scale)
	Draws an image as a bitmap at a given position, with some custom scale and rotation changes.
virtual void	drawCircle (int x, int y, int radius, const mrpt::utils::TColor color=mrpt::utils::TColor(255, 255, 255), unsigned int width=1)
	Draws a circle of a given radius.
template<class MATRIX2X2 >
void	ellipseGaussian (const MATRIX2X2 *cov2D, const double mean_x, const double mean_y, double confIntervalStds=2, const mrpt::utils::TColor color=mrpt::utils::TColor(255, 255, 255), unsigned int width=1, int nEllipsePoints=20)
	Draws an ellipse representing a given confidence interval of a 2D Gaussian distribution.
template<class FEATURELIST >
void	drawFeaturesSimple (const FEATURELIST &list, const TColor &color=TColor::red)
	Draws a set of marks onto the image, given a generic container of entities having just "x" and "y" fields.
template<class FEATURELIST >
void	drawFeatures (const FEATURELIST &list, const TColor &color=TColor::red, const bool showIDs=false, const bool showResponse=false)
	Draws a set of marks (or scaled circles for features with scale) onto the image, given a generic container of features.
Protected Attributes
std::string	m_selectedFont
	The selected font name.
const uint32_t *	m_selectedFontBitmaps
	Direct access to character bitmaps.

Member Enumeration Documentation

enum mrpt::utils::CCanvas::TPenStyle

Definition of pen styles.

Enumerator:

psSolid
psDash
psDot
psDashDot
psDashDotDot

Definition at line 76 of file CCanvas.h.

Constructor & Destructor Documentation

mrpt::utils::CCanvas::CCanvas ( )

virtual mrpt::utils::CCanvas::~CCanvas ( ) [inline, virtual]

Dummy virtual destructor:

Definition at line 87 of file CCanvas.h.

Member Function Documentation

void mrpt::utils::CCanvas::cross	(	int	x0,
		int	y0,
		const mrpt::utils::TColor	color,
		char	type,
		unsigned int	size = `5`,
		unsigned int	width = `1`
	)

Draw a cross.

Parameters:

x0	The point x coordinate
y0	The point y coordinate
color	The color of the cross
size	The size of the cross
type	The cross type. It could be: 'x', '+' or ':'(like '+' but clear at the center dot)
width	The desired width of the cross (this is IGNORED yet)

virtual void mrpt::utils::CCanvas::drawCircle	(	int	x,
		int	y,
		int	radius,
		const mrpt::utils::TColor	color = `mrpt::utils::TColor(255, 255, 255)`,
		unsigned int	width = `1`
	)		`[virtual]`

Draws a circle of a given radius.

Parameters:

x	The center - x coordinate in pixels.
y	The center - y coordinate in pixels.
radius	The radius - in pixels.
color	The color of the circle.
width	The desired width of the line (this is IGNORED in this virtual class)

template<class FEATURELIST >

void mrpt::utils::CCanvas::drawFeatures	(	const FEATURELIST &	list,
		const TColor &	color = `TColor::red`,
		const bool	showIDs = `false`,
		const bool	showResponse = `false`
	)		`[inline]`

Draws a set of marks (or scaled circles for features with scale) onto the image, given a generic container of features.

The class of FEATURELIST can be mrpt::vision::CFeatureList

See also:: drawFeaturesSimple

Definition at line 327 of file CCanvas.h.

References mrpt::format(), mrpt::utils::TColor::red, and mrpt::utils::round().

template<class FEATURELIST >

void mrpt::utils::CCanvas::drawFeaturesSimple	(	const FEATURELIST &	list,
		const TColor &	color = `TColor::red`
	)		`[inline]`

Draws a set of marks onto the image, given a generic container of entities having just "x" and "y" fields.

The class of FEATURELIST can be, for example, std::vector<TPoint2D>, std::vector<TPixelCoordsf> or mrpt::vision::CFeatureList

See also:: drawFeatures

Definition at line 315 of file CCanvas.h.

References mrpt::utils::round().

virtual void mrpt::utils::CCanvas::drawImage	(	int	x,
		int	y,
		const utils::CImage &	img
	)		`[virtual]`

Draws an image as a bitmap at a given position.

Parameters:

x0	The top-left corner x coordinates on this canvas where the image is to be drawn
y0	The top-left corner y coordinates on this canvas where the image is to be drawn
img	The image to be drawn in this canvas This method may be redefined in some classes implementing this interface in a more appropiate manner.

Reimplemented in mrpt::utils::CEnhancedMetaFile.

Referenced by mrpt::utils::CEnhancedMetaFile::drawImage().

virtual void mrpt::utils::CCanvas::drawImage	(	int	x,
		int	y,
		const utils::CImage &	img,
		float	rotation,
		float	scale
	)		`[virtual]`

Draws an image as a bitmap at a given position, with some custom scale and rotation changes.

Parameters:

x0	The top-left corner x coordinates on this canvas where the image is to be drawn
y0	The top-left corner y coordinates on this canvas where the image is to be drawn
rotation	The rotation in radians, positive values being anti-clockwise direction, 0 is the normal position.
scale	The scale factor, e.g. 2 means twice the original size.
img	The image to be drawn in this canvas This method may be redefined in some classes implementing this interface in a more appropiate manner.

Reimplemented in mrpt::utils::CEnhancedMetaFile.

template<class MATRIX2X2 >

void mrpt::utils::CCanvas::ellipseGaussian	(	const MATRIX2X2 *	cov2D,
		const double	mean_x,
		const double	mean_y,
		double	confIntervalStds = `2`,
		const mrpt::utils::TColor	color = `mrpt::utils::TColor(255,255,255)`,
		unsigned int	width = `1`,
		int	nEllipsePoints = `20`
	)		`[inline]`

Draws an ellipse representing a given confidence interval of a 2D Gaussian distribution.

Parameters:

mean_x	The x coordinate of the center point of the ellipse.
mean_y	The y coordinate of the center point of the ellipse.
cov2D	A 2x2 covariance matrix.
confIntervalStds	How many "sigmas" for the confidence level (i.e. 2->95%, 3=99.97%,...)
color	The color of the ellipse
width	The desired width of the line (this is IGNORED in this virtual class)
nEllipsePoints	The number of points to generate to approximate the ellipse shape.

Exceptions:

std::exception On an invalid matrix.

Definition at line 266 of file CCanvas.h.

References cos(), M_2PI, MRPT_END_WITH_CLEAN_UP, MRPT_START, mrpt::utils::round(), and sin().

virtual void mrpt::utils::CCanvas::filledRectangle	(	int	x0,
		int	y0,
		int	x1,
		int	y1,
		const mrpt::utils::TColor	color
	)		`[virtual]`

Draws a filled rectangle.

Parameters:

x0	The top-left x coordinate
y0	The top-left y coordinate
x1	The right-bottom x coordinate
y1	The right-bottom y coordinate
color	The color of the rectangle fill This method may be redefined in some classes implementing this interface in a more appropiate manner.

See also:: rectangle

virtual size_t mrpt::utils::CCanvas::getHeight ( ) const [pure virtual]

Returns the height of the image in pixels.

Implemented in mrpt::utils::CEnhancedMetaFile, and mrpt::utils::CImage.

virtual size_t mrpt::utils::CCanvas::getWidth ( ) const [pure virtual]

Returns the width of the image in pixels.

Implemented in mrpt::utils::CEnhancedMetaFile, and mrpt::utils::CImage.

virtual void mrpt::utils::CCanvas::line	(	int	x0,
		int	y0,
		int	x1,
		int	y1,
		const mrpt::utils::TColor	color,
		unsigned int	width = `1`,
		TPenStyle	penStyle = `psSolid`
	)		`[virtual]`

Draws a line.

Parameters:

x0	The starting point x coordinate
y0	The starting point y coordinate
x1	The end point x coordinate
y1	The end point y coordinate
color	The color of the line
width	The desired width of the line (this is IGNORED in this virtual class) This method may be redefined in some classes implementing this interface in a more appropiate manner.

Reimplemented in mrpt::utils::CEnhancedMetaFile, and mrpt::utils::CImage.

void mrpt::utils::CCanvas::rectangle	(	int	x0,
		int	y0,
		int	x1,
		int	y1,
		const mrpt::utils::TColor	color,
		unsigned int	width = `1`
	)

Draws a rectangle (an empty rectangle, without filling)

Parameters:

x0	The top-left x coordinate
y0	The top-left y coordinate
x1	The right-bottom x coordinate
y1	The right-bottom y coordinate
color	The color of the line
width	The desired width of the line.

See also:: filledRectangle

Reimplemented in mrpt::utils::CEnhancedMetaFile.

virtual void mrpt::utils::CCanvas::selectTextFont ( const std::string & fontName ) [virtual]

Select the current font used when drawing text.

Parameters:

fontName The name of the font See the wiki for a list of valid font names.

See also:: textOut

virtual void mrpt::utils::CCanvas::setPixel	(	int	x,
		int	y,
		size_t	color
	)		`[pure virtual]`

Changes the value of the pixel (x,y).

Pixel coordinates starts at the left-top corner of the image, and start in (0,0). The meaning of the parameter "color" depends on the implementation: it will usually be a 24bit RGB value (0x00RRGGBB), but it can also be just a 8bit gray level.

You can also use a TColor() type as input and it will be automatically converted to size_t.

This method must support (x,y) values OUT of the actual image size without neither raising exceptions, nor leading to memory access errors.

Implemented in mrpt::utils::CEnhancedMetaFile, and mrpt::utils::CImage.

virtual void mrpt::utils::CCanvas::textOut	(	int	x0,
		int	y0,
		const std::string &	str,
		const mrpt::utils::TColor	color
	)		`[virtual]`

Renders 2D text using bitmap fonts.

Parameters:

x0	The x coordinates
y0	The y coordinates
str	The string to put. If using UNICODE characters, use UTF-8 encoding.
color	The text color

See also:: selectTextFont

Reimplemented in mrpt::utils::CEnhancedMetaFile.

void mrpt::utils::CCanvas::triangle	(	int	x0,
		int	y0,
		int	size,
		const mrpt::utils::TColor	color,
		bool	inferior = `true`,
		unsigned int	width = `1`
	)

Draws a triangle.

Parameters:

x0	The triangle center x coordinate
y0	The triangle center y coordinate
size	The size of the triangle
color	The color of the line
inferior	The position of the triangle
width	The desired width of the line.

See also:: triangle

Member Data Documentation

std::string mrpt::utils::CCanvas::m_selectedFont [protected]

The selected font name.

Definition at line 66 of file CCanvas.h.

const uint32_t* mrpt::utils::CCanvas::m_selectedFontBitmaps [protected]

Direct access to character bitmaps.

Definition at line 68 of file CCanvas.h.

mrpt::utils::CCanvas Class Reference

Detailed Description

Public Types

Public Member Functions

Protected Attributes

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation