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Content import utime import display import math FPS = 25 SLEEP_TIME = 1 / FPS # seconds WIDTH = 160 HEIGHT = 80 TWO_PI = 3.14 * 2 buffer = [] # table of sine values for faster processing sin_table = [] def init_sin_table(): tab_size = 500 for i in range(tab_size): x = i/tab_size * TWO_PI sin_table.append( math.sin(x) ) def mysin(x): global sin_table x2 = x % TWO_PI x3 = len(sin_table) * x2 / TWO_PI return sin_table[int(x3)] def mycos(x): return mysin(x + 3.14) def init_buffer(): global buffer for _x in range(WIDTH): for _y in range(HEIGHT): buffer.append(0) def handle_px(x, y, t, p): v = mysin(1*(p['x']*x*mysin(t/2) + p['y']*y*mycos(t/3)) + t) # -1 < sin() < +1 # therfore correct the value and bring into range [0, 1] v = (v+1.0) / 2.0 return v def draw_image_buffered(t, disp, param): global buffer for x in range(WIDTH): for y in range(HEIGHT): # drawing not every pixel if x % 6 == 0 and y % 6 == 0: v = handle_px(x, y, t, param) c = 255 if v>0.5 else 0 index = y * WIDTH + x c_buf = buffer[index] # only draw if value in buffer changed if c != c_buf: col = (c, c, 0) disp.circ(x,y,3,col=col) buffer[index] = c disp.update() def main(): t = 0.0 disp = display.open() init_buffer() init_sin_table() utime.sleep(1) disp.clear() params = {'x': 0.3, 'y': 1.2, 'current': 'x'} while True: draw_image_buffered(t, disp, params) t += 0.1 disp.close() print("Starting rotplasma") main()