node-epd

Nodejs library for Waveshare e-Paper modules

Information

Library is writed for 2.9" waveshare e-paper display, but it should work for 1.54", 2.13".

Requirements

• wiringPi
• libfreetype6-dev

Example

var lcd = new Lcd(0, 4, 10, 5, 1, 55); //initialize display
lcd.clear(); //clear all lcd
var fontAwesome = lcd.font('./test/fontawesome-webfont.ttf', 10); //load ttf font
var robotoFont = lcd.font('./test/Roboto-Regular.ttf', 14); //load ttf font
lcd.char(fontAwesome, 50, 110, 0xf206); //draw char (utf16)
lcd.drawString(robotoFont, 10, 50, "Hello"); //draw string (utf8)
lcd.circle(10,20,25, true); //draw filled circle
lcd.rect(50, 8, 50, 50); //draw rect
lcd.update(function() { //update all display
  console.log("LCD updated");
  lcd.clearPart(); //switch to partitial update mode
  lcd.rect(100, 100, 20, 20); //draw rect
  lcd.line(100, 100, 120, 120); //draw line in rect
  lcd.partUpdate(); //update only changed part of display
});

Documentation

Classes

Lcd

Main Lcd driver class

Typedefs

Rect : Object

Rect object

FontFace : Object

FT_Face object wrapper

EpdSize : Object

EpdSize object

Color : number

Drawing color -1 inverse, 1 black (default), 0 white

Lcd

Main Lcd driver class

Kind: global class

• Lcd
  • new Lcd(channel, dc, cs, rst, led)
  • .font(ttfPath, font) ⇒ FontFace
  • .size() ⇒ EpdSize
  • .clear()
  • .clearPart()
  • .update()
  • .partUpdate()
  • .line(x, y, x2, y2, col)
  • .rect(x, y, width, height, fill, col)
  • .circle(x, y, r, fill, col)
  • .pixel(x, y, col)
  • .drawChar(x, y, char) ⇒ Rect
  • .drawString(font, x, y) ⇒ Rect
  • .color(color)

new Lcd(channel, dc, cs, rst, led)

Param	Type	Description
channel	number	spi channel
dc	number	dc pin
cs	number	cs pin
rst	number	rst pin
led	number	additional led pin

lcd.font(ttfPath, font) ⇒ FontFace

Load ttf font

Kind: instance method of Lcd
Returns: FontFace - Description of return value.

Param	Type	Description
ttfPath	string	font path
font	number	size

lcd.size() ⇒ EpdSize

Return lcd resolution

Kind: instance method of Lcd
Returns: EpdSize - display width and height

lcd.clear()

Clear whole screen and set all refresh mode

Kind: instance method of Lcd

lcd.clearPart()

Change display mode to partial drawing

Kind: instance method of Lcd

lcd.update()

Update whole screen

Kind: instance method of Lcd

lcd.partUpdate()

Update changed part of screen

Kind: instance method of Lcd

lcd.line(x, y, x2, y2, col)

Draw line

Kind: instance method of Lcd

Param	Type	Description
x	number	start point on x axis
y	number	start point on y axis
x2	number	end point on x axis
y2	number	end point on y axis
col	Color	line color

lcd.rect(x, y, width, height, fill, col)

Draw rect

Kind: instance method of Lcd

Param	Type	Description
x	number	start point on x axis
y	number	start point on y axis
width	number	rect width
height	number	rect height
fill	bool	If true rect is filled
col	Color	rect color

lcd.circle(x, y, r, fill, col)

Draw circle

Kind: instance method of Lcd

Param	Type	Description
x	number	mid point on x axis
y	number	mid point on y axis
r	number	circle size
fill	bool	If true circle is filled
col	Color	circle color

lcd.pixel(x, y, col)

Draw pixel

Kind: instance method of Lcd

Param	Type	Description
x	number	point on x axis
y	number	point on y axis
col	Color	pixel color

lcd.drawChar(x, y, char) ⇒ Rect

Draw character from 16 bit representation

Kind: instance method of Lcd

Param	Type	Description
x	number	point on x axis
y	number	point on y axis
char	number	char code

lcd.drawString(font, x, y) ⇒ Rect

Draw string from 8bit representation

Kind: instance method of Lcd
Returns: Rect - drawed coordinates

Param	Type	Description
font	FontFace	Font to draw string
x	number	x position
y	number	y position

lcd.color(color)

Set default color to use

Kind: instance method of Lcd

Param	Type	Description
color	number	0 is white, 1 is black, -1 is inversion of current state

Rect : Object

Rect object

Kind: global typedef
Properties

Name	Type
xMin	number
yMin	number
xMax	number
yMax	number

FontFace : Object

FT_Face object wrapper

Kind: global typedef
Properties

Name	Type	Description
size	number	font size
height	number	font size in px

EpdSize : Object

EpdSize object

Kind: global typedef
Properties

Name	Type	Description
width	number	Display width in px
height	number	Display height in px

Color : number

Drawing color -1 inverse, 1 black (default), 0 white

Kind: global typedef