Waveshare E-Paper Displays - Revision history

Cskallak at 15:44, 22 October 2020

2020-10-22T15:44:55Z

← Older revision		Revision as of 15:44, 22 October 2020
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	drawblack.line((x_start, y_start, x_end, y_end), fill = 0)		drawblack.line((x_start, y_start, x_end, y_end), fill = 0)
	drawblack.rectangle((x_start, y_start, x_end, y_end), outline = 0)		drawblack.rectangle((x_start, y_start, x_end, y_end), outline = 0)

			=== Calendar Example ===
			The calendar app which is shown in the image above can be downloaded on this gitlab [https://git.fh-campuswien.ac.at/c1710475053/elvis-praktikum/tree/master/Wave%20Share%20Display repository] it uses the Google Calendar API to display the events to the Waveshare Display.

	== Used Hardware ==		== Used Hardware ==

Cskallak: /* Pillow python library */

2020-10-22T15:41:46Z

Pillow python library

← Older revision		Revision as of 15:41, 22 October 2020
Line 62:		Line 62:
	Here will be explained only a reduced set of commands of the Pillow library, more information about it can be found [https://pillow.readthedocs.io/en/stable/ here].		Here will be explained only a reduced set of commands of the Pillow library, more information about it can be found [https://pillow.readthedocs.io/en/stable/ here].

			==== Image.new ====
			The Image.new new function creates an new virtual image. The first parameter defines the color space and in this specific case the one bit black and white color space is needed. The second parameter is filled with a tuple that defines te pixels of the height and width. The last parameter sets the colour which the whole image gets filed with. Our particular Displays need two image instances one for the black and white portion and one for the red portion.

	BlackImage = Image.new('1', (epd.height, epd.width), 255)		BlackImage = Image.new('1', (epd.height, epd.width), 255)
	RedYelloyImage = Image.new('1', (epd.height, epd.width), 255)		RedYelloyImage = Image.new('1', (epd.height, epd.width), 255)

			==== Image.Draw====
			The image Draw function enables us to write text and draw shapes onto the virtual image

	drawblack = ImageDraw.Draw(BlackImage)		drawblack = ImageDraw.Draw(BlackImage)
	drawyellow = ImageDraw.Draw(RedYelloyImage )		drawyellow = ImageDraw.Draw(RedYelloyImage)

			==== Writing Texts ====
			To write a text the true type text font file needs to be imported first. The font size needs to be specified, during the importing function. Afterward the Darw.text can be used as shown.

	font20 = ImageFont.truetype(os.path.join(picdir, 'Font.ttc'), 20)		font20 = ImageFont.truetype(os.path.join(picdir, 'Font.ttc'), 20)
	drawblack.text((~~120~~, 0), 'Hello World', font = font20, fill = 0)		drawblack.text((x_start, y_start), 'Hello World', font = font20, fill = 0)

			==== Drawing Shapes ====
			The drawing shapes functions are strait forward they need a specified tuple of start and end points and the colour the shape get filled with.

	drawblack.line((x_start, y_start, x_end, y_end), fill = 0)		drawblack.line((x_start, y_start, x_end, y_end), fill = 0)
			drawblack.rectangle((x_start, y_start, x_end, y_end), outline = 0)

	== Used Hardware ==		== Used Hardware ==

Cskallak: /* Pillow python library */

2020-10-22T15:19:39Z

Pillow python library

← Older revision		Revision as of 15:19, 22 October 2020
Line 62:		Line 62:
	Here will be explained only a reduced set of commands of the Pillow library, more information about it can be found [https://pillow.readthedocs.io/en/stable/ here].		Here will be explained only a reduced set of commands of the Pillow library, more information about it can be found [https://pillow.readthedocs.io/en/stable/ here].

	~~HRYimage = Image.new('1', (epd.height, epd.width), 255)~~
	~~HBlackimage = Image.new('1', (epd.height, epd.width), 255)~~

	drawblack = ImageDraw.Draw(~~HBlackimage~~)
			BlackImage = Image.new('1', (epd.height, epd.width), 255)
			RedYelloyImage = Image.new('1', (epd.height, epd.width), 255)


			drawblack = ImageDraw.Draw(BlackImage)
			drawyellow = ImageDraw.Draw(RedYelloyImage )

			font20 = ImageFont.truetype(os.path.join(picdir, 'Font.ttc'), 20)
			drawblack.text((120, 0), 'Hello World', font = font20, fill = 0)

			drawblack.line((x_start, y_start, x_end, y_end), fill = 0)

	== Used Hardware ==		== Used Hardware ==

Cskallak: /* Pillow python library */

2020-10-22T15:15:06Z

Pillow python library

← Older revision		Revision as of 15:15, 22 October 2020
Line 61:		Line 61:
	The Waveshare display converts Pillow images to a byte array for displaying them on the e-paper display.		The Waveshare display converts Pillow images to a byte array for displaying them on the e-paper display.
	Here will be explained only a reduced set of commands of the Pillow library, more information about it can be found [https://pillow.readthedocs.io/en/stable/ here].		Here will be explained only a reduced set of commands of the Pillow library, more information about it can be found [https://pillow.readthedocs.io/en/stable/ here].

			HRYimage = Image.new('1', (epd.height, epd.width), 255)
			HBlackimage = Image.new('1', (epd.height, epd.width), 255)

			drawblack = ImageDraw.Draw(HBlackimage)

	== Used Hardware ==		== Used Hardware ==

Cskallak: /* Pillow python library */

2020-10-22T15:12:44Z

Pillow python library

← Older revision		Revision as of 15:12, 22 October 2020
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	=== Pillow python library ===		=== Pillow python library ===
	The Waveshare display converts Pillow images to a byte array for displaying them on the e-paper display.		The Waveshare display converts Pillow images to a byte array for displaying them on the e-paper display.
	Here will be explained only a reduced set of commands of the Pillow library, more information about it can be found ~~here~~[https://pillow.readthedocs.io/en/stable/ here].		Here will be explained only a reduced set of commands of the Pillow library, more information about it can be found [https://pillow.readthedocs.io/en/stable/ here].

	== Used Hardware ==		== Used Hardware ==

Cskallak: /* Waveshare e-paper display python library */

2020-10-22T15:12:32Z