27 lines
696 B
Python
27 lines
696 B
Python
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import math
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def perpendicular(l, c, r):
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# l stands for left, c for centre, r for right angles
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# the inputs are floats representing angles
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# returns the angle which is perpendicular to the screen
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float theta1
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dT1 = c - l
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dT2 = r - c
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# convert to radians
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dT1 = dT1 * math.pi / 180
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dT2 = dT2 * math.pi / 180
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# This is really only a theoretic case
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#if |dT2| < 0.001:
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#theta1 = math.pi/2
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# apply the formula to obtain theta1
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up = math.cos(dT1) * math.sin(dT1) * math.sin(dT2) - 1
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down = (math.sin(dT1) * math.sin(dT1)) * math.sin(dT2)
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theta1 = math.arctan(up / down)
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theta1 = theta1 * 180 / math.pi
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return (l - theta1)
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