GraphicsStream Class Reference

Output text (form different data type sources) on screen in graphic mode (similar to TextStream) More...

#include <graphicsstream.h>

Inheritance diagram for GraphicsStream:

Collaboration diagram for GraphicsStream:

Public Member Functions
	GraphicsStream (Graphics &graphics, const Point &start, unsigned width, unsigned height, Font *font=nullptr)
	Constructor.
void	setPos (int x, int y)
	Set the cursor position.
void	getPos (int &x, int &y) const
	Read the current cursor position.
void	print (char *str, int length, const Color &color=LIGHT_GREY)
	Display multiple characters in the window starting at the current cursor position.
void	reset (char character=' ', const Color &color=LIGHT_GREY)
	Clear window and reset cursor.
void	show (int x, int y, char character, const Color &color=LIGHT_GREY)
	Basic output of a (colored) character at a certain position on the screen.
void	draw ()
	Draw using the Graphics device.
Public Member Functions inherited from OutputStream
	OutputStream ()
	Default constructor. Initial number system is decimal.
virtual	~OutputStream ()
	Destructor.
virtual void	flush ()=0
	Clears the buffer.
OutputStream &	operator<< (char c)
	Print a single character.
OutputStream &	operator<< (unsigned char c)
	Print a single character.
OutputStream &	operator<< (const char *string)
	Printing a null-terminated string.
OutputStream &	operator<< (bool b)
	Print a boolean value.
OutputStream &	operator<< (short ival)
	Print an integral number in radix base.
OutputStream &	operator<< (unsigned short ival)
	Print an integral number in radix base.
OutputStream &	operator<< (int ival)
	Print an integral number in radix base.
OutputStream &	operator<< (unsigned int ival)
	Print an integral number in radix base.
OutputStream &	operator<< (long ival)
	Print an integral number in radix base.
OutputStream &	operator<< (unsigned long ival)
	Print an integral number in radix base.
OutputStream &	operator<< (long long ival)
	Print an integral number in radix base.
OutputStream &	operator<< (unsigned long long ival)
	Print an integral number in radix base.
OutputStream &	operator<< (const void *ptr)
	Print a pointer as hexadecimal number.
OutputStream &	operator<< (OutputStream &(*f)(OutputStream &))
	Calls one of the manipulator functions.
Public Member Functions inherited from Stringbuffer
virtual	~Stringbuffer ()
	Destructor (nothing to do here)

Public Attributes
Font *const	FONT
	Default font.
const Point	START
	Upper left corner of the window.
const unsigned	ROWS
	Number of rows in the window.
const unsigned	COLUMNS
	Number of columns in the window.
Public Attributes inherited from OutputStream
int	base
	Number system used for printing integral numbers (one of 2, 8, 10, or 16)

Static Public Attributes
static const Color	BLACK
	CGA color palette.

Protected Member Functions
void	flush ()
	Output the buffer contents of the base class Stringbuffer.
Protected Member Functions inherited from Stringbuffer
	Stringbuffer ()
	Constructor; Marks the buffer as empty.
void	put (char c)
	Inserts a character into the buffer.
virtual void	flush ()=0
	Flush the buffer contents.

Private Attributes
unsigned	y
	Cursor position.

Additional Inherited Members
Protected Attributes inherited from Stringbuffer
char	buffer [80+1]
long unsigned	pos
	current position in the buffer

Detailed Description

Output text (form different data type sources) on screen in graphic mode (similar to TextStream)

Enables output of different data types using a monospaced font on a predefined area of the screen with activated graphics mode.

Constructor & Destructor Documentation

GraphicsStream()

GraphicsStream::GraphicsStream	(	Graphics &	graphics,
		const Point &	start,
		unsigned	width,
		unsigned	height,
		Font *	font = nullptr
	)

Constructor.

Creates a window (= area on the screen) for text output. Within the window text uses a virtual (invisible) cursor to offer a very similar behavior to TextStream – including automatic scrolling and column/row based positioning.

Parameters

graphics	Graphics device for output
start	Coordinate of the upper left corner for the output window
width	Width of the output window
height	Height of the output window
font	Font used for output text (or nullptr for default font)

Member Function Documentation

flush()

void GraphicsStream::flush ( )

protectedvirtual

Output the buffer contents of the base class Stringbuffer.

The method is automatically called when the buffer is full, but can also be called explicitly to force output of the current buffer.

Implements OutputStream.

getPos()

void GraphicsStream::getPos	(	int &	x,
		int &	y
	)		const

Read the current cursor position.

Parameters

x	Column in window
y	Row in window

print()

void GraphicsStream::print	(	char *	str,
		int	length,
		const Color &	color = LIGHT_GREY
	)

Display multiple characters in the window starting at the current cursor position.

This method can be used to output a string, starting at the current cursor position. Since the string does not need to contain a '\0' termination (as it is usually the case in C), the parameter length is required to specify the number of characters in the string. When the output is complete, the cursor will be positioned after the last character printed. The entire text uniformly has the color color

If there is not enough space left at the end of the line, the output will be continued on the following line. As soon as the last window line is filled, the entire window area will be moved up one line. The first line disappears and the last line is blank, continuing output there.

A line break will also occurs wherever the character \\n is inserted in the text to be output.

Parameters

str	String to output
length	length of string
color	Foreground color of string

reset()

void GraphicsStream::reset	(	char	character = ' ',
		const Color &	color = LIGHT_GREY
	)

Clear window and reset cursor.

Parameters

character	Filling character
color	Foreground color

setPos()

void GraphicsStream::setPos	(	int	x,
		int	y
	)

Set the cursor position.

Parameters

x	Column in window
y	Row in window

show()

void GraphicsStream::show	(	int	x,
		int	y,
		char	character,
		const Color &	color = LIGHT_GREY
	)

Basic output of a (colored) character at a certain position on the screen.

Outputs character at the absolute position (x, y) with the specified color: x specifies the column and y the row of the desired position, with 0 ≤ x < COLUMNS and 0 ≤ y < ROWS. The position (0,0) indicates the upper left corner of the window (at the coordinates START).

Parameters

x	Column for output of the character
y	Row for output of the character
character	Character to be output
color	Foreground color

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

• device/graphicsstream.h
• device/graphicsstream.cc