an image that can be read pixel by pixel More...

#include <graphics.h>

Inheritance diagram for bmptk::graphics::image_pixels:

Public Member Functions
	image_pixels (vector size)
	constructor, specify the size

vector	size_get () const
	get the size of the picture

bool	is_valid (const vector p) const
	report whether p is within the image

virtual void	draw (frame &frame, const vector position=vector::origin()) const

color	read (const vector p) const
	read one pixel, address specified by vector

Public Member Functions inherited from bmptk::graphics::image
	image ()
	default constructor

Protected Member Functions
virtual color	checked_read (const vector p) const =0
	get the color of the specified pixel

Protected Attributes
vector	size
	the size of the (rectangular) block occupied by the objecy

Detailed Description

an image that can be read pixel by pixel

An image_pixels is an image, hence it can draw itself in a frame.

Additionally, each pixel of the image_pixels can be read. A concrete child class must implement a checked_read() function that returns the color of the requested pixel. The image_pixels class itself provides a read() function that first checks whether the requested pixel is within the area (otherwise it returns color::transparent) and if so, calls checked_read() to do the real work.

Definition at line 1495 of file graphics.h.

Member Function Documentation

virtual color bmptk::graphics::image_pixels::checked_read ( const vector p ) const

protectedpure virtual

get the color of the specified pixel

This function must be provided by a concrete photo class that depends on the It can assume that the requested pixel is valid (within the photo).

Implemented in bmptk::graphics::char_photo.

virtual void bmptk::graphics::image_pixels::draw	(	frame &	frame,
		const vector	position = `vector::origin()`
	)		const

virtual

draw the picture in the frame at the position

The default draw method reads each pixel and writes it in the frame. A concrete image class might provide a more efficient draw method, that draws only the pixels that are not transparent.

Implements bmptk::graphics::image.

color bmptk::graphics::image_pixels::read ( const vector p ) const

inline

read one pixel, address specified by vector

This function will return color::transparent when the requested pixel is outside the image. Otherwise it will call checked_read.

Definition at line 1535 of file graphics.h.

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

graphics/graphics.h

Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Member Function Documentation