from vpython import *
import numpy as np

canvas(width=1200, height=600)

support = box(size=vector(0.5, 0.01, 0.5), pos=vector(0, 1, 0))
spring = helix(radius, length=2, coils=30, axis=vector(0, -1, 0), pos=vector(0, 1, 0))
ball = sphere(radius=0.2, color=color.red, pos=vector(0, -1, 0))

while True:
    rate(100)
    for i in np.linspace(2, 3.5, 100000):
        spring.length = i
        ball.pos.y = 1 - i
        ball.pos = vector(0, ball.pos.y, 0)
    for i in np.linspace(3.5, 2, 100000):
        spring.length = i
        ball.pos.y = 1 - i
        ball.pos = vector(0, ball.pos.y, 0)

import React from 'react';
import { shallow, configure } from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';

configure({ adapter: new Adapter() });

import HelloWorld from './app';

var TestResult = function() {
    this.succeeded = false;
    this.reason = "";
    this.input = "";
    this.expected_output = "";
    this.actual_output = "";
}

export const executeTests = function() {

  var results = [];

  result = new TestResult();
  result.input = 'HelloWorld Component';
  result.expected_output = "span containing text 'Hello World'"

  let wrapper = shallow(<HelloWorld />);

  // Call your Challenge function here.

  let type = wrapper.type();
  let testSuccessful = true;
  let failureReason;

  if (type !== 'span') {
    testSuccessful = false;
    failureReason = "You need to render exactly one span HTML element";
  } else if (wrapper.props().children != "Hello World") {
     testSuccessful = false;
     failureReason = "You have rendered wrong message in your span element";
  }

  result.actual_output = wrapper.html();

  if (testSuccessful) {
    result.succeeded = true;
    result.reason = "Succeeded"
  } else {
    result.succeeded = false;
    result.reason = failureReason;
  }

  results.push(result);

  return results;
}


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Helix with VPython

VPython visualizes 3D objects. Code example explains creating a helical spring with harmonic motion.

Helix with VPython

Helix

Syntax

Code execution

Code

Code explanation

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