sync with current state

apps/plane_wave.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+
+import sys
+import os
+import numpy as np
+import pygame
+
+Nx = int(sys.argv[1])
+Ny = int(sys.argv[2])
+try:
+    frequency = float(sys.argv[3])
+except (IndexError, ValueError):
+    frequency = 5
+
+fps = 30
+amplitude = 105
+offset = 150
+t = 0
+
+x,y = np.meshgrid(np.linspace(0, 2*np.pi * min(1, Nx/Ny), Nx),  np.linspace(0, 2*np.pi * min(1, Ny/Nx), Ny))
+kx = x + y
+
+clock = pygame.time.Clock()
+
+while True:
+    t = t + 1e-3
+    R = amplitude * np.sin(kx - 2 * np.pi * frequency * t) + offset
+    G = amplitude * np.sin(kx - 2 * np.pi * frequency  * t + 2*np.pi/3) + offset
+    B = amplitude * np.sin(kx - 2 * np.pi * frequency  * t + 4*np.pi/3) + offset
+
+    out = np.dstack((R,G,B)).astype(np.uint8).tobytes()
+    os.write(1, out)
+    clock.tick_busy_loop(fps)