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71 lines
1.8 KiB
Python
71 lines
1.8 KiB
Python
#!/usr/bin/env python3
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import cairo
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import math
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from utils import random_color
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# dimensions of the output image
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WIDTH, HEIGHT = 1024, 1024
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# numbers of waves
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WAVES = 10
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# how much should the phases be offset?
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WAVE_OFFSET = -0.7
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# amplitude of the sine wave
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AMPLITUDE = 25
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# only 1 color with shades?
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MONOCHROME = True
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# background black? White otherwise:
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DARK_BG = True
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def main():
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surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, WIDTH, HEIGHT)
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ctx = cairo.Context(surface)
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ctx.scale(WIDTH, HEIGHT) # Normalizing the canvas
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wave_height = 1/WAVES
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lastpoints = [(x/1000, 0) for x in range(1000)]
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if DARK_BG:
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# make bg black
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ctx.rectangle(0, 0, 1, 1)
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ctx.set_source_rgb(0, 0, 0)
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ctx.fill()
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if MONOCHROME:
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r, g, b = random_color()
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alpha_step = 1/WAVES
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for num in range(WAVES+1):
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if not MONOCHROME:
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r, g, b = random_color()
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points = []
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x = 0
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while x < 1:
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y = math.sin(x*AMPLITUDE + (num * WAVE_OFFSET) ) * 0.1
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points.append((x, ( (y/4) + ((0.5+num)*wave_height))))
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x += 0.001
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if not MONOCHROME:
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ctx.set_source_rgb(r, g, b)
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else:
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ctx.set_source_rgba(r, g, b, 1 - (alpha_step * num)) # make more transparent toward bottom
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# draw waves
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ctx.move_to(*points[0])
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for p in points[1:]:
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ctx.line_to(*p)
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ctx.set_line_width(0.002)
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ctx.stroke()
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# fill area above
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for pos in range(len(points)):
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ctx.move_to(*points[pos])
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ctx.line_to(*lastpoints[pos])
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ctx.stroke()
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lastpoints = points
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surface.write_to_png("out/waves.png") # Output to PNG
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if __name__ == '__main__':
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main()
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