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about_turtle.txt
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about_turtledemo.txt
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demohelp.txt
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tdemo_I_dontlike_tiltdemo.py
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tdemo_I_dontlike_tiltdemo.pyc
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tdemo_I_dontlike_tiltdemo.pyo
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tdemo_bytedesign.py
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tdemo_bytedesign.pyc
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tdemo_bytedesign.pyo
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tdemo_chaos.py
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tdemo_chaos.pyc
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tdemo_chaos.pyo
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tdemo_clock.py
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tdemo_clock.pyc
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tdemo_clock.pyo
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tdemo_colormixer.py
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tdemo_colormixer.pyc
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tdemo_colormixer.pyo
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tdemo_fractalcurves.py
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tdemo_fractalcurves.pyc
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tdemo_fractalcurves.pyo
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tdemo_lindenmayer_indian.py
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tdemo_lindenmayer_indian.pyc
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tdemo_lindenmayer_indian.pyo
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tdemo_minimal_hanoi.py
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tdemo_minimal_hanoi.pyc
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tdemo_minimal_hanoi.pyo
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tdemo_nim.py
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tdemo_nim.pyc
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tdemo_nim.pyo
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tdemo_paint.py
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tdemo_paint.pyc
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tdemo_paint.pyo
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tdemo_peace.py
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tdemo_peace.pyc
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tdemo_peace.pyo
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tdemo_penrose.py
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tdemo_penrose.pyc
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tdemo_penrose.pyo
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tdemo_planet_and_moon.py
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tdemo_planet_and_moon.pyc
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tdemo_planet_and_moon.pyo
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tdemo_tree.py
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tdemo_tree.pyc
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tdemo_tree.pyo
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tdemo_wikipedia.py
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tdemo_wikipedia.pyc
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tdemo_wikipedia.pyo
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tdemo_yinyang.py
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tdemo_yinyang.pyc
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tdemo_yinyang.pyo
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turtle.cfg
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turtleDemo.py
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turtleDemo.pyc
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turtleDemo.pyo
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turtledemo_two_canvases.py
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turtledemo_two_canvases.pyc
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turtledemo_two_canvases.pyo
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Code Editor : tdemo_planet_and_moon.py
#! /usr/bin/env python """ turtle-example-suite: tdemo_planets_and_moon.py Gravitational system simulation using the approximation method from Feynman-lectures, p.9-8, using turtlegraphics. Example: heavy central body, light planet, very light moon! Planet has a circular orbit, moon a stable orbit around the planet. You can hold the movement temporarily by pressing the left mouse button with mouse over the scrollbar of the canvas. """ from turtle import Shape, Turtle, mainloop, Vec2D as Vec from time import sleep G = 8 class GravSys(object): def __init__(self): self.planets = [] self.t = 0 self.dt = 0.01 def init(self): for p in self.planets: p.init() def start(self): for i in range(10000): self.t += self.dt for p in self.planets: p.step() class Star(Turtle): def __init__(self, m, x, v, gravSys, shape): Turtle.__init__(self, shape=shape) self.penup() self.m = m self.setpos(x) self.v = v gravSys.planets.append(self) self.gravSys = gravSys self.resizemode("user") self.pendown() def init(self): dt = self.gravSys.dt self.a = self.acc() self.v = self.v + 0.5*dt*self.a def acc(self): a = Vec(0,0) for planet in self.gravSys.planets: if planet != self: v = planet.pos()-self.pos() a += (G*planet.m/abs(v)**3)*v return a def step(self): dt = self.gravSys.dt self.setpos(self.pos() + dt*self.v) if self.gravSys.planets.index(self) != 0: self.setheading(self.towards(self.gravSys.planets[0])) self.a = self.acc() self.v = self.v + dt*self.a ## create compound yellow/blue turtleshape for planets def main(): s = Turtle() s.reset() s.tracer(0,0) s.ht() s.pu() s.fd(6) s.lt(90) s.begin_poly() s.circle(6, 180) s.end_poly() m1 = s.get_poly() s.begin_poly() s.circle(6,180) s.end_poly() m2 = s.get_poly() planetshape = Shape("compound") planetshape.addcomponent(m1,"orange") planetshape.addcomponent(m2,"blue") s.getscreen().register_shape("planet", planetshape) s.tracer(1,0) ## setup gravitational system gs = GravSys() sun = Star(1000000, Vec(0,0), Vec(0,-2.5), gs, "circle") sun.color("yellow") sun.shapesize(1.8) sun.pu() earth = Star(12500, Vec(210,0), Vec(0,195), gs, "planet") earth.pencolor("green") earth.shapesize(0.8) moon = Star(1, Vec(220,0), Vec(0,295), gs, "planet") moon.pencolor("blue") moon.shapesize(0.5) gs.init() gs.start() return "Done!" if __name__ == '__main__': msg = main() print msg mainloop()
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