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64 lines
1.6 KiB
Python
64 lines
1.6 KiB
Python
"""
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Additive Wave
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by Daniel Shiffman.
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Create a more complex wave by adding two waves together.
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"""
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xspacing = 8 # How far apart should each horizontal location be spaced
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maxwaves = 4 # total # of waves to add together
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theta = 0.0
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amplitude = [] # Height of wave
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# Value for incrementing X, to be calculated as a function of period and
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# xspacing
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dx = []
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yvalues = []
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def setup():
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size(640, 360)
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frameRate(30)
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colorMode(RGB, 255, 255, 255, 100)
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w = width + 16
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for i in range(maxwaves):
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amplitude.append(random(10, 30))
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period = random(100, 300) # How many pixels before the wave repeats
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dx.append((TWO_PI / period) * xspacing)
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for _ in range(w / xspacing + 1):
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yvalues.append(0.0)
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def draw():
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background(0)
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calcWave()
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renderWave()
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def calcWave():
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# Increment theta (try different values for 'angular velocity' here
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theta += 0.02
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# Set all height values to zero
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for i in range(len(yvalues)):
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yvalues[i] = 0
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# Accumulate wave height values
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for j in range(maxwaves):
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x = theta
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for i in range(len(yvalues)):
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# Every other wave is cosine instead of sine
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if j % 2 == 0:
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yvalues[i] += sin(x) * amplitude[j]
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else:
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yvalues[i] += cos(x) * amplitude[j]
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x += dx[j]
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def renderWave():
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# A simple way to draw the wave with an ellipse at each location
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noStroke()
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fill(255, 50)
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ellipseMode(CENTER)
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for x, v in enumerate(yvalues):
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ellipse(x * xspacing, height / 2 + v, 16, 16)
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