103 lines
2.8 KiB
Python
103 lines
2.8 KiB
Python
import time
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import random
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from stellar import StellarUnicorn
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from picographics import PicoGraphics, DISPLAY_STELLAR_UNICORN as DISPLAY
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'''
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A pretty, procedural fire effect.
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You can adjust the brightness with LUX + and -.
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'''
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su = StellarUnicorn()
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graphics = PicoGraphics(DISPLAY)
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fire_colours = [graphics.create_pen(0, 0, 0),
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graphics.create_pen(20, 20, 20),
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graphics.create_pen(180, 30, 0),
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graphics.create_pen(220, 160, 0),
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graphics.create_pen(255, 255, 180)]
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@micropython.native # noqa: F821
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def update():
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# take local references as it's quicker than accessing the global
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# and we access it a lot in this method
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_heat = heat
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# clear the bottom row and then add a new fire seed to it
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for x in range(width):
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_heat[x][height - 1] = 0.0
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_heat[x][height - 2] = 0.0
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for c in range(fire_spawns):
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x = random.randint(0, width - 4) + 2
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_heat[x + 0][height - 1] = 1.0
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_heat[x + 1][height - 1] = 1.0
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_heat[x - 1][height - 1] = 1.0
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_heat[x + 0][height - 2] = 1.0
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_heat[x + 1][height - 2] = 1.0
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_heat[x - 1][height - 2] = 1.0
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factor = damping_factor / 5.0
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for y in range(0, height - 2):
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for x in range(1, width - 1):
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_heat[x][y] += _heat[x][y + 1] + _heat[x][y + 2] + _heat[x - 1][y + 1] + _heat[x + 1][y + 1]
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_heat[x][y] *= factor
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@micropython.native # noqa: F821
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def draw():
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# take local references as it's quicker than accessing the global
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# and we access it a lot in this method
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_graphics = graphics
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_heat = heat
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_set_pen = graphics.set_pen
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_pixel = graphics.pixel
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_fire_colours = fire_colours
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for y in range(StellarUnicorn.HEIGHT):
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for x in range(StellarUnicorn.WIDTH):
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value = _heat[x + 1][y]
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if value < 0.15:
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_set_pen(_fire_colours[0])
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elif value < 0.25:
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_set_pen(_fire_colours[1])
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elif value < 0.35:
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_set_pen(_fire_colours[2])
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elif value < 0.45:
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_set_pen(_fire_colours[3])
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else:
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_set_pen(_fire_colours[4])
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_pixel(x, y)
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su.update(_graphics)
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width = StellarUnicorn.WIDTH + 2
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height = StellarUnicorn.HEIGHT + 4
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heat = [[0.0 for y in range(height)] for x in range(width)]
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fire_spawns = 5
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damping_factor = 0.97
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su.set_brightness(0.5)
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while True:
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if su.is_pressed(StellarUnicorn.SWITCH_BRIGHTNESS_UP):
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su.adjust_brightness(+0.01)
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if su.is_pressed(StellarUnicorn.SWITCH_BRIGHTNESS_DOWN):
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su.adjust_brightness(-0.01)
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start = time.ticks_ms()
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update()
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draw()
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print("total took: {} ms".format(time.ticks_ms() - start))
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# pause for a moment (important or the USB serial device will fail)
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time.sleep(0.001)
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