adding fill() method and the fireflies example

examples/fireflies.py

@@ -0,0 +1,54 @@
+import time
+import ws2812b
+import random
+
+bright_div = 20
+numpix = 30  # Number of NeoPixels
+# Pin where NeoPixels are connected
+strip = ws2812b.ws2812b(numpix, 0,0)
+
+colors = [
+    [232, 100, 255],  # Purple
+    [200, 200, 20],  # Yellow
+    [30, 200, 200],  # Blue
+    [150,50,10],
+    [50,200,0],
+]
+
+max_len=20
+min_len = 5
+#pixelnum, posn in flash, flash_len, direction
+flashing = []
+
+num_flashes = 5
+
+for i in range(num_flashes):
+    pix = random.randint(0, numpix - 1)
+    col = random.randint(1, len(colors) - 1)
+    flash_len = random.randint(min_len, max_len)
+    flashing.append([pix, colors[col], flash_len, 0, 1])
+    
+strip.fill(0,0,0)
+
+while True:
+    strip.show()
+    for i in range(num_flashes):
+
+        pix = flashing[i][0]
+        brightness = (flashing[i][3]/flashing[i][2])
+        colr = (int(flashing[i][1][0]*brightness), 
+                int(flashing[i][1][1]*brightness), 
+                int(flashing[i][1][2]*brightness))
+        strip.set_pixel(pix, colr[0], colr[1], colr[2])
+
+        if flashing[i][2] == flashing[i][3]:
+            flashing[i][4] = -1
+        if flashing[i][3] == 0 and flashing[i][4] == -1:
+            pix = random.randint(0, numpix - 1)
+            col = random.randint(0, len(colors) - 1)
+            flash_len = random.randint(min_len, max_len)
+            flashing[i] = [pix, colors[col], flash_len, 0, 1]
+        flashing[i][3] = flashing[i][3] + flashing[i][4]
+        time.sleep(0.007)
+            
+ 

examples/flash.py

@@ -0,0 +1,14 @@
+import time
+from ws2812b import ws2812b
+
+num_leds = 30
+pixels = ws2812b(num_leds, 0,0)
+
+while True:
+    for i in range(30):
+        for j in range(30):
+            pixels.set_pixel(j,abs(i+j)%10,abs(i-(j+3))%10,abs(i-(j+6))%10)          
+        pixels.show()
+        time.sleep(0.05)
+
+

ws2812b.py

@@ -30,3 +30,8 @@ class ws2812b:
         for i in range(self.num_leds):
             self.sm.put(self.pixels[i],8)
             
+    def fill(self, red, green, blue):
+        for i in range(self.num_leds):
+            self.set_pixel(i, red, green, blue)
+        
+