mirror of
https://github.com/coding-horror/basic-computer-games.git
synced 2025-12-22 07:10:42 -08:00
d26dbf036a
Spaces tend to cause annoyances in a Unix-style shell environment. This change fixes that.
111 lines
2.6 KiB
Python
111 lines
2.6 KiB
Python
"""
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BOUNCE
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A physics simulation
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Ported by Dave LeCompte
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"""
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PAGE_WIDTH = 64
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def print_centered(msg):
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spaces = " " * ((PAGE_WIDTH - len(msg)) // 2)
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print(spaces + msg)
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def print_header(title):
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print_centered(title)
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print_centered("CREATIVE COMPUTING MORRISTOWN, NEW JERSEY")
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print()
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print()
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print()
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def print_instructions():
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print("THIS SIMULATION LETS YOU SPECIFY THE INITIAL VELOCITY")
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print("OF A BALL THROWN STRAIGHT UP, AND THE COEFFICIENT OF")
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print("ELASTICITY OF THE BALL. PLEASE USE A DECIMAL FRACTION")
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print("COEFFICIENCY (LESS THAN 1).")
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print()
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print("YOU ALSO SPECIFY THE TIME INCREMENT TO BE USED IN")
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print("'STROBING' THE BALL'S FLIGHT (TRY .1 INITIALLY).")
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print()
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def get_initial_conditions():
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delta_t = float(input("TIME INCREMENT (SEC)? "))
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print()
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v0 = float(input("VELOCITY (FPS)? "))
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print()
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coeff_rest = float(input("COEFFICIENT? "))
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print()
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return delta_t, v0, coeff_rest
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def print_at_tab(line, tab, s):
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line += (" " * (tab - len(line))) + s
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return line
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def run_simulation(delta_t, v0, coeff_rest):
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t = [0] * 20 # time of each bounce
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print("FEET")
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print()
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sim_dur = int(70 / (v0 / (16 * delta_t)))
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for i in range(1, sim_dur + 1):
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t[i] = v0 * coeff_rest ** (i - 1) / 16
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# Draw the trajectory of the bouncing ball, one slice of height at a time
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h = int(-16 * (v0 / 32) ** 2 + v0 ** 2 / 32 + 0.5)
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while h >= 0:
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line = ""
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if int(h) == h:
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line += str(int(h))
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l = 0
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for i in range(1, sim_dur + 1):
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tm = 0
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while tm <= t[i]:
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l += delta_t
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if (
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abs(h - (0.5 * (-32) * tm ** 2 + v0 * coeff_rest ** (i - 1) * tm))
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<= 0.25
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):
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line = print_at_tab(line, int(l / delta_t), "0")
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tm += delta_t
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tm = t[i + 1] / 2
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if -16 * tm ** 2 + v0 * coeff_rest ** (i - 1) * tm < h:
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break
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print(line)
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h = h - 0.5
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print("." * (int((l + 1) / delta_t) + 1))
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print
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line = " 0"
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for i in range(1, int(l + 0.9995) + 1):
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line = print_at_tab(line, int(i / delta_t), str(i))
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print(line)
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print()
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print(print_at_tab("", int((l + 1) / (2 * delta_t) - 2), "SECONDS"))
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print()
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def main():
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print_header("BOUNCE")
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print_instructions()
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while True:
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delta_t, v0, coeff_rest = get_initial_conditions()
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run_simulation(delta_t, v0, coeff_rest)
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break
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if __name__ == "__main__":
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main()
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