Added missing lines.py

apps/lines.py

@@ -0,0 +1,81 @@
+#!/usr/bin/env python3
+
+import os
+import sys
+import random 
+import time
+import random
+import colorsys
+
+Nx = int(sys.argv[1])
+Ny = int(sys.argv[2])
+
+PixelsPerFrame = 20
+NumLines = 7
+LineGenerationRate = 0.2
+time_ms = 10
+try:
+    time_ms = int(sys.argv[3])
+except:
+    pass
+buffer = bytearray(b"\x00" * (3 * Nx * Ny))
+
+def SetPixel(x, y, r, g, b):
+    idx = x+Nx*y
+    buffer[3*idx+0] = r
+    buffer[3*idx+1] = g
+    buffer[3*idx+2] = b
+
+
+class Line:
+    def __init__(self):
+        self.color = random.random()*0.3+0.7
+        self.dir = random.randint(0, 3)
+        if self.dir == 0:
+            self.posx = 0
+            self.posy = random.randint(0, Ny-1)
+        if self.dir == 1:
+            self.posx = Nx-1
+            self.posy = random.randint(0, Ny-1)
+        if self.dir == 2:
+            self.posx = random.randint(0, Nx-1)
+            self.posy = 0
+        if self.dir == 3:
+            self.posx = random.randint(0, Nx-1)
+            self.posy = Ny-1
+
+    def step(self):
+        self.color *= 0.995
+        pixel = int(self.color*255)
+        SetPixel(self.posx, self.posy, pixel, pixel, pixel)
+        if self.dir == 0:
+            self.posx += 1
+        if self.dir == 1:
+            self.posx -= 1
+        if self.dir == 2:
+            self.posy += 1
+        if self.dir == 3:
+            self.posy -= 1
+
+    def alive(self):
+        return self.posx >= 0 and self.posx < Nx and self.posy >= 0 and self.posy < Ny
+
+lines = []
+while True:
+    for i in range(PixelsPerFrame):
+        x = random.randint(0, Nx-1)
+        y = random.randint(0, Ny-1)
+        r, g, b = colorsys.hsv_to_rgb(random.random(), 0.7, 0.5)
+        r = int(r*255)
+        g = int(g*255)
+        b = int(b*255)
+        SetPixel(x, y, r, g, b)
+    for line in lines:
+        line.step()
+        if not line.alive():
+            lines.remove(line)
+    if len(lines) < NumLines and random.random() < LineGenerationRate:
+        lines.append(Line())
+    os.write(1, buffer)
+    time.sleep(time_ms*0.001)
+