GFX Class Reference

GFX helper class. More...

Detailed Description

This file is used by the screen.

Public Member Functions
	GFX (int width, int height, uint8_t *screenBuffer, const unsigned char *font)
	~GFX ()
virtual void	setAddrWindow (uint8_t x0, uint8_t y0, uint8_t x1, uint8_t y1)=0
virtual void	drawPixel (int16_t x, int16_t y, uint16_t color)=0
virtual void	refresh ()=0
void	drawChar (int16_t x, int16_t y, uint8_t data, uint16_t color, uint16_t bg, uint8_t size)
void	print (std::string msg)
mraa::Result	setPixel (int x, int y, uint16_t color)
void	fillScreen (uint16_t color)
void	fillRect (int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color)
void	drawFastVLine (int16_t x, int16_t y, int16_t h, uint16_t color)
void	drawLine (int16_t x0, int16_t y0, int16_t x1, int16_t y1, uint16_t color)
void	drawTriangle (int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t x2, int16_t y2, uint16_t color)
void	drawCircle (int16_t x, int16_t y, int16_t r, uint16_t color)
void	setCursor (int16_t x, int16_t y)
void	setTextColor (uint16_t textColor, uint16_t textBGColor)
void	setTextSize (uint8_t size)
void	setTextWrap (uint8_t wrap)

Data Fields
int	m_height
int	m_width
int	m_textSize
int	m_textColor
int	m_textBGColor
int	m_cursorX
int	m_cursorY
int	m_wrap
uint8_t *	m_map

Protected Attributes
const int16_t	WIDTH
const int16_t	HEIGHT
const unsigned char *	m_font

Constructor & Destructor Documentation

GFX	(	int	width,
		int	height,
		uint8_t *	screenBuffer,
		const unsigned char *	font
	)

Instantiates a GFX object

Parameters

width	Screen width
height	Screen height
screenBuffer	Pointer to the screen buffer
font	Pointer to the font map

~GFX

(

)

GFX object destructor

Member Function Documentation

virtual void setAddrWindow ( uint8_t  x0, uint8_t  y0, uint8_t  x1, uint8_t  y1  )

pure virtual

Sets the window address

Parameters

x0	First coordinate
y0	First coordinate
x1	Second coordinate
y1	Second coordinate

Implemented in ST7735.

virtual void drawPixel ( int16_t  x, int16_t  y, uint16_t  color  )

pure virtual

Sends a pixel color (RGB) to the chip. Must be implemented by the inherited class.

Parameters

x	Axis on the horizontal scale
y	Axis on the vertical scale
color	RGB value

Implemented in ST7735.

virtual void refresh ( )

pure virtual

Copies the buffer to the chip via the SPI.

Implemented in ST7735.

void drawChar	(	int16_t	x,
		int16_t	y,
		uint8_t	data,
		uint16_t	color,
		uint16_t	bg,
		uint8_t	size
	)

Parameters

x	Axis on the horizontal scale
y	Axis on the vertical scale
data	Character to write
color	Character color
bg	Character background color
size	Size of the font

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void print

(

std::string

msg

)

Prints a message on the screen

Parameters

msg	Message to print

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mraa::Result setPixel	(	int	x,
		int	y,
		uint16_t	color
	)

Prints a message on the screen

Parameters

x	Axis on the horizontal scale
y	Axis on the vertical scale
color	Pixel color

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void fillScreen

(

uint16_t

color

)

Fills the screen with a selected color

Parameters

color

Selected color

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void fillRect	(	int16_t	x,
		int16_t	y,
		int16_t	w,
		int16_t	h,
		uint16_t	color
	)

Fills a rectangle with a selected color

Parameters

x	Axis on the horizontal scale (top-left corner)
y	Axis on the vertical scale (top-left corner)
w	Distanse from x
h	Distanse from y
color	Selected color

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void drawFastVLine	(	int16_t	x,
		int16_t	y,
		int16_t	h,
		uint16_t	color
	)

Draws a line on the vertical scale

Parameters

x	Axis on the horizontal scale
y	Axis on the vertical scale
h	Distanse from y
color	Selected color

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void drawLine	(	int16_t	x0,
		int16_t	y0,
		int16_t	x1,
		int16_t	y1,
		uint16_t	color
	)

Draws a line from coordinate C0 to coordinate C1

Parameters

x0	First coordinate
y0	First coordinate
x1	Second coordinate
y1	Second coordinate
color	selected color

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void drawTriangle	(	int16_t	x0,
		int16_t	y0,
		int16_t	x1,
		int16_t	y1,
		int16_t	x2,
		int16_t	y2,
		uint16_t	color
	)

Draws a triangle

Parameters

x0	First coordinate
y0	First coordinate
x1	Second coordinate
y1	Second coordinate
x2	Third coordinate
y2	Third coordinate
color	Selected color

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void drawCircle	(	int16_t	x,
		int16_t	y,
		int16_t	r,
		uint16_t	color
	)

Draws a circle

Parameters

x	Center of the circle on the horizontal scale
y	Center of the circle on the vertical scale
r	Radius of the circle
color	Color of the circle

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void setCursor	(	int16_t	x,
		int16_t	y
	)

Sets the cursor for a text message

Parameters

x	Axis on the horizontal scale
y	Axis on the vertical scale

void setTextColor	(	uint16_t	textColor,
		uint16_t	textBGColor
	)

Sets a text color for a message

Parameters

textColor	Font color
textBGColor	Background color

void setTextSize

(

uint8_t

size

)

Sets the size of the font

Parameters

size

Font size

void setTextWrap

(

uint8_t

wrap

)

Wraps a printed message

Parameters

wrap	True (0x1) or false (0x0)

Field Documentation

int m_height

Screen height

int m_width

Screen width

int m_textSize

Printed text size

int m_textColor

Printed text color

int m_textBGColor

Printed text background color

int m_cursorX

Cursor X coordinate

int m_cursorY

Cursor Y coordinate

int m_wrap

Wrapper flag (true or false)

uint8_t* m_map

Screens buffer

Inheritance diagram for GFX:

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

• /var/lib/jenkins/workspace/upm-doc-stable/src/st7735/gfx.h
• /var/lib/jenkins/workspace/upm-doc-stable/src/st7735/gfx.cxx