9cd5f5f00e
* Update polygon-area-calculator.md * Update probability-calculator.md * Update time-calculator.md * Apply suggestions from code review Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com> * Apply suggestions from code review Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com> Co-authored-by: Nicholas Carrigan (he/him) <nhcarrigan@gmail.com>
119 lines
3.9 KiB
Markdown
119 lines
3.9 KiB
Markdown
---
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id: 5e444147903586ffb414c94f
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title: Polygon Area Calculator
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challengeType: 10
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forumTopicId: 462363
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dashedName: polygon-area-calculator
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---
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# --description--
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You will be [working on this project with our Replit starter code](https://replit.com/github/freeCodeCamp/boilerplate-polygon-area-calculator).
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We are still developing the interactive instructional part of the Python curriculum. For now, here are some videos on the freeCodeCamp.org YouTube channel that will teach you everything you need to know to complete this project:
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- [Python for Everybody Video Course](https://www.freecodecamp.org/news/python-for-everybody/) (14 hours)
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- [Learn Python Video Course](https://www.freecodecamp.org/news/learn-python-video-course/) (10 hours)
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# --instructions--
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In this project you will use object oriented programming to create a Rectangle class and a Square class. The Square class should be a subclass of Rectangle and inherit methods and attributes.
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## Rectangle class
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When a Rectangle object is created, it should be initialized with `width` and `height` attributes. The class should also contain the following methods:
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- `set_width`
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- `set_height`
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- `get_area`: Returns area (`width * height`)
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- `get_perimeter`: Returns perimeter (`2 * width + 2 * height`)
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- `get_diagonal`: Returns diagonal (`(width ** 2 + height ** 2) ** .5`)
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- `get_picture`: Returns a string that represents the shape using lines of "\*". The number of lines should be equal to the height and the number of "\*" in each line should be equal to the width. There should be a new line (`\n`) at the end of each line. If the width or height is larger than 50, this should return the string: "Too big for picture.".
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- `get_amount_inside`: Takes another shape (square or rectangle) as an argument. Returns the number of times the passed in shape could fit inside the shape (with no rotations). For instance, a rectangle with a width of 4 and a height of 8 could fit in two squares with sides of 4.
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Additionally, if an instance of a Rectangle is represented as a string, it should look like: `Rectangle(width=5, height=10)`
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## Square class
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The Square class should be a subclass of Rectangle. When a Square object is created, a single side length is passed in. The `__init__` method should store the side length in both the `width` and `height` attributes from the Rectangle class.
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The Square class should be able to access the Rectangle class methods but should also contain a `set_side` method. If an instance of a Square is represented as a string, it should look like: `Square(side=9)`
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Additionally, the `set_width` and `set_height` methods on the Square class should set both the width and height.
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## Usage example
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```py
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rect = shape_calculator.Rectangle(10, 5)
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print(rect.get_area())
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rect.set_height(3)
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print(rect.get_perimeter())
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print(rect)
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print(rect.get_picture())
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sq = shape_calculator.Square(9)
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print(sq.get_area())
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sq.set_side(4)
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print(sq.get_diagonal())
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print(sq)
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print(sq.get_picture())
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rect.set_height(8)
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rect.set_width(16)
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print(rect.get_amount_inside(sq))
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```
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That code should return:
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```bash
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50
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26
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Rectangle(width=10, height=3)
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**********
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**********
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**********
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81
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5.656854249492381
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Square(side=4)
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****
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****
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****
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****
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8
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```
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The unit tests for this project are in `test_module.py`.
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## Development
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Write your code in `shape_calculator.py`. For development, you can use `main.py` to test your `shape_calculator()` function. Click the "run" button and `main.py` will run.
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## Testing
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We imported the tests from `test_module.py` to `main.py` for your convenience. The tests will run automatically whenever you hit the "run" button.
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## Submitting
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Copy your project's URL and submit it to freeCodeCamp.
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# --hints--
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It should create a Rectangle class and Square class and pass all tests.
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```js
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```
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# --solutions--
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```js
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/**
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Backend challenges don't need solutions,
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because they would need to be tested against a full working project.
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Please check our contributing guidelines to learn more.
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*/
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```
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