Created
January 8, 2017 16:47
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LED panel control over MQTT for Node-RED
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| # -*- 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() |
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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