GFX Class Reference

GFX helper class. More...

Detailed Description

This file is used by the screen.

Public Member Functions
	GFX (int16_t w, int16_t h)
virtual void	drawPixel (int16_t x, int16_t y, uint16_t color)=0
virtual void	drawLine (int16_t x0, int16_t y0, int16_t x1, int16_t y1, uint16_t color)
virtual void	drawFastVLine (int16_t x, int16_t y, int16_t h, uint16_t color)
virtual void	drawFastHLine (int16_t x, int16_t y, int16_t w, uint16_t color)
virtual void	drawRect (int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color)
virtual void	fillRect (int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color)
virtual void	fillScreen (uint16_t color)
virtual void	invertDisplay (bool i)
void	drawCircle (int16_t x0, int16_t y0, int16_t r, uint16_t color)
void	drawCircleHelper (int16_t x0, int16_t y0, int16_t r, uint8_t cornername, uint16_t color)
void	fillCircle (int16_t x0, int16_t y0, int16_t r, uint16_t color)
void	fillCircleHelper (int16_t x0, int16_t y0, int16_t r, uint8_t cornername, int16_t delta, 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	fillTriangle (int16_t x0, int16_t y0, int16_t x1, int16_t y1, int16_t x2, int16_t y2, uint16_t color)
void	drawRoundRect (int16_t x0, int16_t y0, int16_t w, int16_t h, int16_t radius, uint16_t color)
void	fillRoundRect (int16_t x0, int16_t y0, int16_t w, int16_t h, int16_t radius, uint16_t color)
void	drawChar (int16_t x, int16_t y, unsigned char c, uint16_t color, uint16_t bg, uint8_t size)
int16_t	getCursorX (void) const
int16_t	getCursorY (void) const
void	setCursor (int16_t x, int16_t y)
void	setTextColor (uint16_t c)
void	setTextColor (uint16_t c, uint16_t bg)
void	setTextSize (uint8_t s)
void	setTextWrap (bool w)
uint8_t	getRotation (void) const
void	setRotation (uint8_t r)
void	cp437 (bool x)
virtual void	write (uint8_t c)
void	print (std::string msg)
int16_t	width (void) const
int16_t	height (void) const
	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
int16_t	_width
int16_t	_height
uint8_t	rotation
uint16_t	textcolor
uint16_t	textbgcolor
int16_t	cursor_x
int16_t	cursor_y
uint8_t	textsize
bool	wrap
bool	_cp437
const unsigned char *	m_font

Static Protected Attributes
static const unsigned char	font []

Constructor & Destructor Documentation

GFX	(	int16_t	w,
		int16_t	h
	)

Creates a GFX object

Parameters

w	Screen width
h	Screen height

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

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~GFX

(

)

GFX object destructor

Member Function Documentation

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

pure virtual

Sends a pixel color (RGB) to the driver chip. This must be defined by the subclass (pure virtual function).

Parameters

x	Axis on the horizontal scale
y	Axis on the vertical scale
color	RGB (16-bit) color (R[0-4], G[5-10], B[11-15]

Implemented in ST7735, and ILI9341.

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

virtual

Draw a line.

Parameters

x0	Start of line x coordinate
y0	Start of line y coordinate
x1	End of line x coordinate
y1	End of line y coordinate
color	RGB (16-bit) color (R[0-4], G[5-10], B[11-15]

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

virtual

Draws a vertical line using minimal SPI writes.

Parameters

x	Axis on the horizontal scale to begin line
y	Axis on the vertical scale to begin line
h	Height of line in pixels
color	RGB (16-bit) color (R[0-4], G[5-10], B[11-15]

Reimplemented in ILI9341.

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void drawFastHLine ( int16_t  x, int16_t  y, int16_t  w, uint16_t  color  )

virtual

Draws a horizontal line using minimal SPI writes.

Parameters

x	Axis on the horizontal scale to begin line
y	Axis on the vertical scale to begin line
w	Width of line in pixels
color	RGB (16-bit) color (R[0-4], G[5-10], B[11-15]

Reimplemented in ILI9341.

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

virtual

Draws a rectangle (not filled).

Parameters

x	Position of upper left corner on horizontal axis
y	Position of upper left corner on vertical axis
w	Width of rectangle
h	Height of rectangle RGB (16-bit) color (R[0-4], G[5-10], B[11-15]

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

virtual

Draw a filled rectangle.

Parameters

x	Axis on the horizontal scale of upper-left corner
y	Axis on the vertical scale of upper-left corner
w	Width of rectangle in pixels
h	Height of rectangle in pixels
color	RGB (16-bit) color (R[0-4], G[5-10], B[11-15]

Reimplemented in ILI9341.

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void fillScreen ( uint16_t  color )

virtual

Fill the screen with a single color.

Parameters

color

RGB (16-bit) color (R[0-4], G[5-10], B[11-15]

Reimplemented in ILI9341.

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void invertDisplay ( bool  i )

virtual

Invert colors on the display.

Parameters

i	True or false to invert colors

Reimplemented in ILI9341.

void drawCircle	(	int16_t	x0,
		int16_t	y0,
		int16_t	r,
		uint16_t	color
	)

Draw a circle outline.

Parameters

x0	Center point of circle on x-axis
y0	Center point of circle on y-axis
r	Radius of circle
color	RGB (16-bit) color (R[0-4], G[5-10], B[11-15]

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void drawCircleHelper	(	int16_t	x0,
		int16_t	y0,
		int16_t	r,
		uint8_t	cornername,
		uint16_t	color
	)

Used to draw rounded corners.

Parameters

x0	Center point of circle on x-axis
y0	Center point of circle on y-axis
r	Radius of circle
cornername	Mask of corner number (1, 2, 4, 8)
color	RGB (16-bit) color (R[0-4], G[5-10], B[11-15]

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void fillCircle	(	int16_t	x0,
		int16_t	y0,
		int16_t	r,
		uint16_t	color
	)

Draws a filled circle.

Parameters

x0	Center point of circle on x-axis
y0	Center point of circle on y-axis
r	Radius of circle
color	RGB (16-bit) color (R[0-4], G[5-10], B[11-15]

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void fillCircleHelper	(	int16_t	x0,
		int16_t	y0,
		int16_t	r,
		uint8_t	cornername,
		int16_t	delta,
		uint16_t	color
	)

Used to draw a filled circle and rounded rectangles.

Parameters

x0	Center point of circle on x-axis
y0	Center point of circle on y-axis
r	Radius of circle
cornername	Mask of corner number (1, 2, 4, 8)
delta	Line offset
color	RGB (16-bit) color (R[0-4], G[5-10], B[11-15]

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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
	)

Draw a triangle.

Parameters

x0	First point coordinate on x-axis
y0	First point coordinate on y-axis
x1	Second point coordinate on x-axis
y1	Second point coordinate on y-axis
x2	Third point coordinate on x-axis
y2	Third point coordinate on y-axis
color	RGB (16-bit) color (R[0-4], G[5-10], B[11-15]

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

Draw a filled triangle.

Parameters

x0	First point coordinate on x-axis
y0	First point coordinate on y-axis
x1	Second point coordinate on x-axis
y1	Second point coordinate on y-axis
x2	Third point coordinate on x-axis
y2	Third point coordinate on y-axis
color	RGB (16-bit) color (R[0-4], G[5-10], B[11-15]

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void drawRoundRect	(	int16_t	x0,
		int16_t	y0,
		int16_t	w,
		int16_t	h,
		int16_t	radius,
		uint16_t	color
	)

Draw a rectangle with rounded corners

Parameters

x0	X-axis coordinate of top-left corner
y0	Y-axis coordinate of top-left corner
w	Width of rectangle
h	height of rectangle
radius	Radius of rounded corners
color	RGB (16-bit) color (R[0-4], G[5-10], B[11-15]

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void fillRoundRect	(	int16_t	x0,
		int16_t	y0,
		int16_t	w,
		int16_t	h,
		int16_t	radius,
		uint16_t	color
	)

Draw a filled rectangle with rounded corners

Parameters

x0	X-axis coordinate of top-left corner
y0	Y-axis coordinate of top-left corner
w	Width of rectangle
h	height of rectangle
radius	Radius of rounded corners
color	RGB (16-bit) color (R[0-4], G[5-10], B[11-15]

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void drawChar	(	int16_t	x,
		int16_t	y,
		unsigned char	c,
		uint16_t	color,
		uint16_t	bg,
		uint8_t	size
	)

Draw a character at the specified point.

Parameters

x	X-axis coordinate of the top-left corner
y	Y-axis coordinate of the top-left corner
c	Character to draw
color	RGB (16-bit) color (R[0-4], G[5-10], B[11-15]
bg	Background color (16-bit RGB)
size	Font size

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int16_t getCursorX

(

void

)

const

Get the x-axis coordinate of the upper-left corner of the cursor.

Returns

X-axis coordinate of the cursor

int16_t getCursorY

(

void

)

const

Get the y-axis coordinate of the upper-left corner of the cursor.

Returns

Y-axis coordinate of the cursor

void setCursor	(	int16_t	x,
		int16_t	y
	)

Set the cursor for writing text.

Parameters

x	X-axis coordinate of the top-left corner of the cursor
y	Y-axis coordinate of the top-left corner of the cursor

void setTextColor

(

uint16_t

c

)

Set the color for text.

Parameters

c	RGB (16-bit) color (R[0-4], G[5-10], B[11-15]

void setTextColor	(	uint16_t	c,
		uint16_t	bg
	)

Set the color for text and text background (highlight).

Parameters

c	Text color (RGB, 16-bit)
bg	Background text color (RGB, 16-bit)

void setTextSize

(

uint8_t

s

)

Set the size of the text.

Parameters

s	Font size (multiples of 8 pixel text height)

void setTextWrap

(

bool

w

)

Enable or disable text wrapping.

Parameters

w	True to wrap text. False to truncate.

uint8_t getRotation

(

void

)

const

Get the current rotation configuration of the screen.

Returns

current rotation 0-3

void setRotation

(

uint8_t

r

)

Sets the rotation of the screen. Can be overridden with another screen-specific definition.

Parameters

r	Rotation 0-3

void cp437

(

bool

x

)

Enable (or disable) Code Page 437-compatible charset.

Parameters

x	True to enable CP437 charset. False to disable.

void write ( uint8_t  c )

virtual

Write a character at the current cursor position. Definition can be overridden with board-specific code.

Parameters

c	Character to draw

Reimplemented in ST7735.

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void print

(

std::string

msg

)

Prints a string to the screen.

Parameters

s	Message to print

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int16_t width

(

void

)

const

Get the current width of the screen.

Returns

the width in pixels

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int16_t height

(

void

)

const

Get the current height of the screen.

Returns

the height in pixels

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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, and ILI9341.

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

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

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

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

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

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

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

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:

• /iotdk/jenkins/workspace/upm-doc-stable/src/ili9341/gfx.h
• /iotdk/jenkins/workspace/upm-doc-stable/src/ili9341/gfx.cxx