파이썬 kivy 시작하기 3 - 태양계

행성들이 가운데 태양을 중심으로 공전하는 모습을 구현해보겠습니다.

 

<main.py>

import math

from kivy.app import App
from kivy.uix.widget import Widget
from kivy.core.window import Window
from kivy.clock import Clock
import math

Window.size = (900, 900)
center_w = Window.size[0]/2
center_h = Window.size[1]/2

class Sun(Widget):
    pass

class Mercury(Widget):
    pass

class Vinus(Widget):
    pass

class Earth(Widget):
    pass

class Mars(Widget):
    pass

class Solar(Widget):
    sw_seconds = 0
    def update(self, nap):  # nap: 증분, dt delta time
        self.sw_seconds += nap

        ## Earth
        E_dis = 300   # 태양으로부터의 거리
        E_r = self.ids.earth.size[0]      # 지구 직경
        E_rv = 45 # 각도도
        self.ids.earth.pos = self.calc_pos(E_dis, E_r, E_rv)

        ## Mercury
        M_dis = 80  # 태양으로부터의 거리
        M_r = self.ids.mercury.size[0]    # 수성 직경
        M_rv = 60  # 시간에 따른 각도
        self.ids.mercury.pos = self.calc_pos(M_dis, M_r, M_rv)

        ## Vinus
        V_dis = 120  # 태양으로부터의 거리
        V_r = self.ids.vinus.size[0]  # 금성 직경
        V_rv = 50  # 시간에 따른 각도
        self.ids.vinus.pos = self.calc_pos(V_dis, V_r, V_rv)

        ## Mars
        MS_dis = 350  # 태양으로부터의 거리
        MS_r = self.ids.mars.size[0]  # 화성 직경
        MS_rv = 30  # 시간에 따른 각도
        self.ids.mars.pos = self.calc_pos(MS_dis, MS_r, MS_rv)



    def calc_pos(self, dis, radius, radial_v):
        degree = radial_v * self.sw_seconds
        pos_x = dis * math.cos(math.pi * degree / 180) + center_w
        pos_y = dis * math.sin(math.pi * degree / 180) + center_h
        pos = (pos_x, pos_y)
        return pos

class SolarApp(App):
    def build(self):
        SolarSystem = Solar()
        Clock.schedule_interval(SolarSystem.update, 1.0 / 60.0)
        return SolarSystem

if __name__ == '__main__':
    SolarApp().run()

 

<solar.kv>

<Sun>:
    size: 50, 50
    canvas:
        Color:
            rgb: 1,0,0
        Ellipse:
            size: self.size
            pos: self.pos

<Mercury>:
    size: 15, 15
    canvas:
        Color:
            rgb: 0,0,1
        Ellipse:
            size: self.size
            pos: self.pos
<Vinus>:
    size: 20, 20
    canvas:
        Color:
            rgb: 1,1,0
        Ellipse:
            size: self.size
            pos: self.pos

<Earth>:
    size: 20, 20
    canvas:
        Color:
            rgb: 0,1,1
        Ellipse:
            size: self.size
            pos: self.pos
<Mars>:
    size: 18, 18
    canvas:
        Color:
            rgb: 1,0.3,0
        Ellipse:
            size: self.size
            pos: self.pos

<Solar>:
    Sun:
        id:sun
        pos: self.parent.center
    Mercury:
        id:mercury
        pos: self.parent.center
    Vinus:
        id:vinus
        pos: self.parent.center
    Earth:
        id:earth
        pos: self.parent.center
    Mars:
        id:mars
        pos: self.parent.center

<결과>