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- !!omap
- - name: pendulum
- - parts:
- - name: head
- shapes:
- libraries: ['from math import tan, radians, sin, cos', 'from pysketcher import *']
- - name: constants
- shapes:
- H: 7.0
- W: 6.0
- - name: frame
- shapes:
- setframe: # sketch setup
- action: drawing_tool.set_coordinate_system(xmin=0, xmax=W,
- ymin=0, ymax=H,
- axis=False)
- setblackline: # default frame values and actions
- action: drawing_tool.set_linecolor('blue')
- L: 5*H/7 # length
- P: (W/6, 0.85*H) # rotation point
- a: 40 # angle
- vertical:
- formula: Line(P, P-point(0,L))
- style:
- linecolor: black
- linewidth: 1
- path:
- formula: Arc(P, L, -90, a)
- style:
- linecolor: black
- linewidth: 1
- angle: Arc_wText(r'$\theta$', P, L/4, -90, a, text_spacing=1/30.)
- #rod: Line(P, P + L*point(sin(radians(a)), -L*cos(radians(a)))) is a less reliable alternative
- mass_pt: path.geometric_features()['end']
- rod: Line(P, mass_pt)
- mass:
- formula: Circle(center=mass_pt, radius=L/20.)
- style:
- filled_curves:
- color: 'blue'
- rod_vec: rod.geometric_features()['end'] - rod.geometric_features()['start']
- unit_rod_vec: unit_vec(rod_vec)
- mass_symbol: Text('$m$', mass_pt + L/10*unit_rod_vec)
- length:
- formula: Distance_wText(P, mass_pt, '$L$') # Displace length indication
- transform: translate(L/15*point(cos(radians(a)), sin(radians(a))))
- gravity: Gravity(start=P+point(0.8*L,0), length=L/3)
- pendulum: "Composition({'body': mass, 'rod': rod,'vertical': vertical, 'theta': angle, 'path': path,'g': gravity, 'L': length, 'm': mass_symbol})"
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