goPlot::Object2DImage Class Reference

Image object. More...

#include <object2dimage.h>

Public Types
enum	{ ARGB32 = 0, RGB24, A8, A1 }

Public Member Functions
void	setImage (unsigned char *image, int format, int width, int height, int stride)
	Set image. More...
int	format () const
void	createImage (int format, int width, int height)
	Creates an image of (width x height) More...
unsigned char *	data ()
	Get the data pointer. More...
int	width () const
	Get image width. More...
int	height () const
	Get image height. More...
int	stride () const
	Get the stride in bytes. More...
virtual void	draw ()
Public Member Functions inherited from goPlot::Object2D
virtual void	setContext (cairo_t *c)
const Trafo2D &	transform () const
void	setTransform (const Trafo2D &T)
cairo_t *	context ()
const cairo_t *	context () const
bool	visible () const
void	setVisible (bool t)
void	applyTransform (cairo_t *cr)

Detailed Description

Image object.

Note

Set the transform with setTransform() sensibly, so the dimensions fit in the graph this object is added to.

Member Function Documentation

createImage()

void goPlot::Object2DImage::createImage	(	int	format,
		int	width,
		int	height
	)

Creates an image of (width x height)

Note

The allocated data has stride stride(). It is found with cairo_format_stride_for_width. Keep this in mind when working with the data!

Parameters

format	Format (see setImage)
width	Width
height	Height

data()

unsigned char * goPlot::Object2DImage::data

(

)

Get the data pointer.

Returns

Data pointer.

height()

int goPlot::Object2DImage::height

(

)

const

Get image height.

Returns

Height in pixels

setImage()

void goPlot::Object2DImage::setImage	(	unsigned char *	image,
		int	format,
		int	width,
		int	height,
		int	stride
	)

Set image.

Parameters

image	Image data (must match the format)
format	Format, one of ARGB32, RGB24, A8, A1 (analog to Cairo)
width	Width of the image
height	Height of the image
stride	Stride (number of bytes in each row)

stride()

int goPlot::Object2DImage::stride

(

)

const

Get the stride in bytes.

Returns

Stride (number of bytes per row).

width()

int goPlot::Object2DImage::width

(

)

const

Get image width.

Returns

Width in pixels

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

• object2dimage.h
• object2dimage.cpp