scroll.py文件 ：

#!/usr/bin/env python
# -*- encoding:utf8 -*-
# By: Ramin Sangesari
import time
import argparse
import sys
import os
import random
import feedparser
from PIL import Image
from PIL import ImageFont
from PIL import Image
from PIL import ImageDraw
from logging import getLogger, StreamHandler, DEBUG
logger = getLogger(__name__)
handler = StreamHandler()
handler.setLevel(DEBUG)
logger.setLevel(DEBUG)
logger.addHandler(handler)
logger.propagate = False
sys.path.append(os.path.abspath(os.path.dirname(__file__) + '/..'))
from rgbmatrix import RGBMatrix, RGBMatrixOptions
def run(image, matrix):
   print("Running...")
   image.resize((matrix.width, matrix.height), Image.ANTIALIAS)
   double_buffer = matrix.CreateFrameCanvas()
   img_width, img_height = image.size
   xpos = 0
   while True:
       xpos += 1
       if (xpos > img_width):
           xpos = 0
           break
       double_buffer.SetImage(image, -xpos)
       double_buffer.SetImage(image, -xpos + img_width)
       double_buffer = matrix.SwapOnVSync(double_buffer)
       time.sleep(0.04)
def prepareMatrix(parser):
   args    = parser.parse_args()
   options = RGBMatrixOptions()
   if args.led_gpio_mapping != None:
     options.hardware_mapping = args.led_gpio_mapping
   options.rows = args.led_rows
   options.cols = args.led_cols
   options.chain_length = args.led_chain
   options.parallel = args.led_parallel
   options.pwm_bits = args.led_pwm_bits
   options.brightness = args.led_brightness
   options.pwm_lsb_nanoseconds = args.led_pwm_lsb_nanoseconds
   options.multiplexing = args.led_multiplexing
   if args.led_show_refresh:
     options.show_refresh_rate = 1
   if args.led_slowdown_gpio != None:
       options.gpio_slowdown = args.led_slowdown_gpio
   if args.led_no_hardware_pulse:
     options.disable_hardware_pulsing = True
   return RGBMatrix(options = options)
def getImageFromFile(path):
   image = Image.open(path).convert('RGB')
   return image
parser = argparse.ArgumentParser()
parser.add_argument("-r", "--led-rows", action="store", help="Display rows. 16 for 16x32, 32 for 32x32. Default: 32", default=32, type=int)
parser.add_argument("-t", "--led-cols", action="store", help="Display rows. 16 for 16x32, 32 for 32x32. Default: 32", default=32, type=int)
parser.add_argument("-c", "--led-chain", action="store", help="Daisy-chained boards. Default: 1.", default=1, type=int)
parser.add_argument("-P", "--led-parallel", action="store", help="For Plus-models or RPi2: parallel chains. 1..3. Default: 1", default=1, type=int)
parser.add_argument("-p", "--led-pwm-bits", action="store", help="Bits used for PWM. Something between 1..11. Default: 11", default=11, type=int)
parser.add_argument("-b", "--led-brightness", action="store", help="Sets brightness level. Default: 100. Range: 1..100", default=10, type=int)
parser.add_argument("-m", "--led-gpio-mapping", help="Hardware Mapping: regular, adafruit-hat, adafruit-hat-pwm" , choices=['regular', 'adafruit-hat', 'adafruit-hat-pwm'], type=str)
parser.add_argument("--led-scan-mode", action="store", help="Progressive or interlaced scan. 0 Progressive, 1 Interlaced (default)", default=1, choices=range(2), type=int)
parser.add_argument("--led-pwm-lsb-nanoseconds", action="store", help="Base time-unit for the on-time in the lowest significant bit in nanoseconds. Default: 130", default=130, type=int)
parser.add_argument("--led-show-refresh", action="store_true", help="Shows the current refresh rate of the LED panel")
parser.add_argument("--led-slowdown-gpio", action="store", help="Slow down writing to GPIO. Range: 1..100. Default: 1", choices=range(3), type=int)
parser.add_argument("--led-no-hardware-pulse", action="store", help="Don't use hardware pin-pulse generation")
parser.add_argument("--led-multiplexing", action="store", help="Multiplexing type: 0=direct; 1=strip; 2=checker; 3=spiral (Default: 0)", default=2, type=int)
parser.add_argument("-i", "--image", help="The image to display", default="./news.ppm")
imgdir = os.path.abspath(os.path.dirname(__file__)) + "/newsimg"
matrix = prepareMatrix(parser)
if not os.path.isdir(imgdir):
   print("Error: no img to display, no such directory.")
   sys.exit(0)
else:
   while True:
       files = os.listdir(imgdir)
       if len(files)==0:
           print("Warning: no img to display, I am going to wait news to come.")
           time.sleep(5.0)
       else:
           frnd = random.sample(files,len(files))
           for f in frnd:
               if f[-4:] == '.ppm':
                   f = os.path.join(imgdir, f)
                   try:
                       if os.path.exists(f):
                           run(getImageFromFile(f), matrix)
                       else:
                           print("Warning: no such file, next please...")
                   except IOError:
                       print("Warning: no such file, next please...")
                   except KeyboardInterrupt:
                       print("Exiting\n")
                       sys.exit(0)
               else:
                   printf("Warning: Please do not include non-ppm files.")
                   sys.exit(0)

rss.py文件：

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# By : Ramin Sangesari
import datetime
import time
import argparse
import sys
import os
import random
import feedparser
import hashlib
from glob import glob
from PIL import Image
from PIL import ImageFont
from PIL import ImageDraw
import urllib2
from bs4 import BeautifulSoup
from logging import getLogger, StreamHandler, DEBUG
logger = getLogger(__name__)
handler = StreamHandler()
handler.setLevel(DEBUG)
logger.setLevel(DEBUG)
logger.addHandler(handler)
logger.propagate = False
sys.path.append(os.path.abspath(os.path.dirname(__file__) + '/..'))
Imgformat = '.ppm'
def isOkToCrawl():
    crawl_interval = 5 #sec.
    crawl_interval_file = "./lastcrawl"
    now = time.time()
    if os.path.isfile(crawl_interval_file):
        if os.stat(crawl_interval_file).st_mtime > now - crawl_interval:
            return False
    
    f = open(crawl_interval_file, 'w')
    f.write(str(now) + "\n")
    f.close()
    return True
	
def getImageFromFile(path):
    image = Image.open(path).convert('RGB')
    return image
	
def saveImgFromText(text, imgdir, fontsize):
    path = os.path.abspath(os.path.dirname(__file__))
    print path
    if fontsize == 20:
        font  = [ImageFont.truetype(path + '/VERDANA.TTF', fontsize),2]
    color  = [(255,0,255),
             (0,255,255),
             (255,255,0),
             (0,255,0),
             (255,255,255)]
    width, ignore = font[0].getsize(text)
    im = Image.new("RGB", (width + 40, fontsize+40), "black")
    draw = ImageDraw.Draw(im)
    draw.text((0, font[1]), text, random.choice(color), font=font[0])
    imgname = imgdir+"/"+str(fontsize)+str(hashlib.md5(text.encode('utf_8')).hexdigest())+Imgformat
    if not os.path.exists(imgname):
        im.save(imgname)
		
		
def removeOldImg(imgdir):
    #remove ppm files more than 1 days before.
    if not(imgdir=="") and not(imgdir=="/")and not(imgdir=="."): 
        now = time.time()
        for f in os.listdir(imgdir):
            if f[-4:] == '.ppm':
                f = os.path.join(imgdir, f)
                if os.stat(f).st_mtime < now - 0.5 * 86400:
                    if os.path.isfile(f):
                        os.remove(f)
						
						
def getNewsFromFeed():
    news  = []
    url = ['http://www.france24.com/en/top-stories/rss']
    for tg in url:
        fd = feedparser.parse(tg)
        for ent in fd.entries:
            news.append(u"          "+unicode(ent.title))
    return news
	
			
parser = argparse.ArgumentParser()
if isOkToCrawl():
    
    imgdir = os.path.abspath(os.path.dirname(__file__)) + "/newsimg"
    print imgdir
    if not os.path.isdir(imgdir):
        os.mkdir(imgdir)
    #clean up old news
    removeOldImg(imgdir)
    #get from RSS feed
    for text in getNewsFromFeed():
        saveImgFromText(text, imgdir, 20)
else:
    print ("You need to wait for 1min before next crawl.")

現(xiàn)在運行以下命令：

python rss.py & sudo python scroll.py

。

示例 #2：使用 C 顯示隨機效應(yīng)

下面是 C 語言的例子。打開examples-api-use目錄minimal-example.cc中的文件并復(fù)制以下代碼。

// Small example how to use the library.
// By: Ramin Sangesari
#include "led-matrix.h"
#include 
#include 
#include 
#include 
using rgb_matrix::GPIO;
using rgb_matrix::RGBMatrix;
using rgb_matrix::Canvas;
uint8_t buffer[64][64][3] = { 0 };
unsigned long step = 0;
volatile bool interrupt_received = false;
static void InterruptHandler(int signo) {
 interrupt_received = true;
}
static void setPixelp(uint8_t x, uint8_t y, float r, float g, float b) {
 buffer[y][x][0] = uint8_t(std::max(0, std::min(255, int(r))));
 buffer[y][x][1] = uint8_t(std::max(0, std::min(255, int(g))));
 buffer[y][x][2] = uint8_t(std::max(0, std::min(255, int(b))));
}
static void HSVtoRGB(float& r, float& g, float& b, float h, float s, float v) {
 if (s == 0.0) {
   r = v;
   g = v;
   b = v;
 }
 int i = int(h * 6.0);
 float f = (h * 6.0) - i;
 float p = v * (1.0 - s);
 float q = v * (1.0 - s * f);
 float t = v * (1.0 - s * (1.0 - f));
 i = i % 6;
 if (i == 0) {
   r = v; g = t; b = p; return; // v, t, p  
 }
 if (i == 1) {
   r = q; g = v; b = p; return; // q, v, p
 }
 if (i == 2) {
   r = p; g = v; b = t; return; // p, v, t
 }
 if (i == 3) {
   r = p; g = q; b = v; return; // p, q, v
 }
 if (i == 4) {
   r = t; g = p; b = v; return; // t, p, v
 }
 if (i == 5) {
   r = v; g = p; b = q; return; // v, p, q
 }
}
void swirl(uint8_t x, uint8_t y, unsigned long step) {
 float fx = x - 31.5;
 float fy = y - 31.5;
 float dist = sqrt(fx * fx + fy * fy) * 0.5;
 float angle = (step * 0.1) + (dist * 1.5);
 float s = sin(angle);
 float c = cos(angle);
 float xs = x * c - y * s;
 float ys = x * s + y * c;
 float r = abs(xs + ys) * 12.0 - 20;
 float g = r + (s * 130);
 float b = r + (c * 130);
 setPixelp(x, y,
   r,
   g,
   b
 );
}
void setPixelU(uint8_t x, uint8_t y, uint8_t r, uint8_t g, uint8_t b) {
 buffer[y][x][0] = r;
 buffer[y][x][1] = g;
 buffer[y][x][2] = b;
}
void gradient(uint8_t x, uint8_t  y, unsigned long  step) {
 uint8_t g = x * 64;
 uint8_t b = y * 64;
 uint8_t r = 255 - (x * 64);  
 setPixelU(x, y, r, g, b);
}
void rainbowSearch(uint8_t x, uint8_t y, unsigned long step) {
 float xs = sin((step) * 0.01) * 20.0;
 float ys = cos((step) * 0.01) * 20.0;
 float scale = ((sin(step / 60.0) + 1.0) * 0.2) + 0.2;
 float r = sin((x + xs) * scale) + cos((y + xs) * scale);
 float g = sin((x + xs) * scale) + cos((y + ys) * scale);
 float b = sin((x + ys) * scale) + cos((y + ys) * scale);
 setPixelp(x, y,
   r * 255,
   g * 255,
   b * 255
 );
}
void checker(uint8_t _x, uint8_t _y, unsigned long step) {
 //float x = _x - 8;
 //float y = _y - 8;
 float x = _x - 32;
 float y = _y - 32;
 float angle = step / 5.0;
 float s = sin(angle);
 float c = cos(angle);
 float xs = x * c - y * s;
 float ys = x * s + y * c;
 xs -= sin(step / 200.0) * 40.0;
 ys -= cos(step / 200.0) * 40.0;
 float scale = step % 20;
 scale /= 20.0;
 scale = (sin(step / 50.0) / 8.0) + 0.25;
 xs *= scale;
 ys *= scale;
 float xo = abs(xs) - int(abs(xs));
 float yo = abs(ys) - int(abs(ys));
 //  l = 0 if @ else 1 if xo > .1 and  else .5
 float l = int(floor(xs) + floor(ys)) % 2 ? 0 : (xo > 0.1 && yo > .1 ? 1 : 0.5);
 float r, g, b;
 HSVtoRGB(r, g, b, (step % 255) / 255.0, 10, 121);
 setPixelU(_x, _y,
   r * (l * 255),
   g * (l * 255),
   b * (l * 255)
 );
}
static void DrawOnCanvas2(Canvas *canvas) {
 /*
  * Let's create a simple animation. We use the canvas to draw
  * pixels. We wait between each step to have a slower animation.
  */
while (true)  {
 for (uint8_t x = 0; x < 64; x++) {
   for (uint8_t y = 0; y < 64; y++) {
     rainbowSearch(x, y, step);
   }
 }
 for (int x = 0; x < 64; x++) {
   for (int y = 0; y < 64; y++) {
     for (int c = 0; c < 3; c++) {  
			canvas->SetPixel(x, y, buffer[x][y][c], buffer[x][y][c], buffer[x][y][c]);  
     }
   }
 }
 step++;
}
}
int main(int argc, char *argv[]) {
 RGBMatrix::Options defaults;
 defaults.hardware_mapping = "regular";  // or e.g. "adafruit-hat"
 defaults.rows = 64;
 defaults.chain_length = 1;
 defaults.parallel = 1;
 defaults.show_refresh_rate = true;
 Canvas *canvas = rgb_matrix::CreateMatrixFromFlags(&argc, &argv, &defaults);
 if (canvas == NULL)
   return 1;
 // It is always good to set up a signal handler to cleanly exit when we
 // receive a CTRL-C for instance. The DrawOnCanvas() routine is looking
 // for that.
 signal(SIGTERM, InterruptHandler);
 signal(SIGINT, InterruptHandler);
 DrawOnCanvas2(canvas);    // Using the canvas.
 // Animation finished. Shut down the RGB matrix.
 canvas->Clear();
 delete canvas;
 return 0;
} 

保存文件并使用make命令編譯它。要運行演示，請運行以下命令：

sudo ./minimal-example

?