LED panel control over MQTT for Node-RED

LED_panel_over_MQTT.py

# -*- coding: utf-8 -*-

import json
import paho.mqtt.client as paho
from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont
import time
from rgbmatrix import RGBMatrix
#from samplebase import SampleBase
from rgbmatrix import graphics


matrix = RGBMatrix(32, 2, 1) # rows, chain, parallel
#canvas = matrix
#canvas2 = matrix.CreateFrameCanvas() 

image = Image.new("RGB", (64, 32))  # Can be larger than matrix if wanted!!
draw = ImageDraw.Draw(image)  # Declare Draw instance before prims 

background = (0, 0, 0)

print '> loading fonts'
font_list = [
			 ['Objective-Bold.ttf', 12], 
			 ['Objective-Bold.ttf', 14], 
			 ['Objective-Bold.ttf', 16],
			 ['Objective-Bold.ttf', 18],
			 ['Objective-Bold.ttf', 20],
			 ['Objective-Bold.ttf', 22],
			 ['Objective-Bold.ttf', 24],
			 ['Objective-Bold.ttf', 25],
			 ['Objective-Bold.ttf', 26],
			 ['Objective-Bold.ttf', 28],
			 ['Objective-Bold.ttf', 30],
			 ['The Gould St.ttf', 20],
			 ['gomarice_usuazi_hosomozi.ttf', 28],
			 ['helvetica-normal.ttf', 10], # 13
			 ['helvetica-normal.ttf', 12],
			 ['helvetica-normal.ttf', 14],
			 ['helvetica-normal.ttf', 16],
			 ['helvetica-normal.ttf', 18],
			 ['helvetica-normal.ttf', 20],
			 ['helvetica-normal.ttf', 22], #18

			 ]

fonts = []

for f in font_list:
	print ' >', f[0], f[1]
	fonts.append(ImageFont.truetype(f[0], f[1]))
print '> fonts loaded'

def on_message(clnt, userdata, msg):
	global background
	global matrix
	j = json.loads(str(msg.payload))

	if 'function' in j:
		if j['function'] == 'set_text':

			canvas = matrix.CreateFrameCanvas()
			json_text = j['text']
			json_red = int(j['red'])
			json_green = int(j['green'])
			json_blue = int(j['blue'])
			json_font = int(j['font'])

			json_x = int(j['x'])
			json_y = int(j['y'])

			font = fonts[json_font]

			text_w, text_h = draw.textsize(json_text, font=font)
			draw.rectangle((json_x, json_y, json_x+text_w, json_y+text_h), fill=background)

			draw.text((json_x, json_y), json_text, font=font, fill=(json_red, json_green, json_blue))
 			canvas.SetImage(image, 0, 0)

			canvas = matrix.SwapOnVSync(canvas)


		if j['function'] == 'clear':
			#print '> clear'
			canvas = matrix.CreateFrameCanvas()
			
			json_red = int(j['red'])
			json_green = int(j['green'])
			json_blue = int(j['blue'])

			background = (json_red, json_green, json_blue)
			draw.rectangle((0, 0, matrix.width, matrix.height), fill=background)
 			canvas.SetImage(image, 0, 0)

			canvas = matrix.SwapOnVSync(canvas)


mqtt = paho.Client()
mqtt.on_message = on_message
mqtt.username_pw_set("admin", "admin") # credentials from Node-RED installation
mqtt.connect("192.168.0.68", 1883)
mqtt.subscribe("ledpanel/1")
print '> Ready'
mqtt.loop_forever()

Interesting idea, have you expanded on this in the last few years???

where do the fonts come from?? where are they loaded on Linux??

Thanks