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README.md

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# Turtle
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Turtle Graphics in PowerShell
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![Turtle Image](data:image/svg+xml;base64,<svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" transform-origin="50% 50%"><symbol id="turtle-symbol" viewBox="0 0 320 277.128129211021" transform-origin="50% 50%"><path id="turtle-path" d="m 0 277.128129211021  l 10 0  l 10 0  l 10 0  l 10 0  l 10 0  l 10 0  l 10 0  l 10 0  l 10 0  l 10 0  l 10 0  l 10 0  l 10 0  l 10 0  l 10 0  l 10 0  l -5 -8.66025403784439  l -5 -8.66025403784439  l -5 -8.66025403784439  l -5 -8.66025403784439  l -5 -8.66025403784439  l -5 -8.66025403784439  l -5 -8.66025403784439  l -5 -8.66025403784439  l -5 8.66025403784438  l -5 8.66025403784438  l -5 8.66025403784438  l -5 8.66025403784438  l 10 0  l 10 0  l -4.99999999999999 -8.66025403784439  l -4.99999999999999 -8.66025403784439  l 10 0  l 10 0  l -5 8.66025403784438  l -5 8.66025403784438  l 10 0  l 10 0  l -5 8.66025403784438  l -5 8.66025403784438  l 10 0  l 10 0  l -5 8.66025403784438  l -5 8.66025403784438  l -5 -8.66025403784439  l -5 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8.66025403784438  l -5 8.66025403784438  l -5 8.66025403784438  l -5 8.66025403784438  l -5 8.66025403784438  l -5 8.66025403784438  l -5 8.66025403784438  l -5 8.66025403784438  l -5 8.66025403784438  l -5 8.66025403784438  l -5 8.66025403784438  l -5 8.66025403784438  l -5 8.66025403784438" stroke="#4488ff" stroke-width="1%" fill="transparent" class="foreground-stroke" /></symbol><use href="#turtle-symbol" width="100%" height="100%" transform-origin="50% 50%" /></svg>)
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## Turtles in a PowerShell
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[Turtle Graphics](https://en.wikipedia.org/wiki/Turtle_graphics) are a great way to learn programming and describe shapes.
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Turtle graphics start really simple.
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Imagine we are a turtle dragging a pen.
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We can draw almost any shape by moving.
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We can only really move in two ways:
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We can turn, and we can take a step forward.
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Turtle graphics starts with these two operations:
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* Rotate() rotates the turtle
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* Forward() moves forward
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We can easily represent these steps in memory, and draw them within a webpage using SVG.
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We can implement Turtle in any language.
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This module implements Turtle in PowerShell.
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### Installing and Importing
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We can install Turtle from the PowerShell Gallery:
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~~~PowerShell
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Install-Module Turtle -Scope CurrentUser -Force
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~~~
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Then we can import it like any other module
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~~~PowerShell
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Import-Module Turtle -Force -PassThru
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~~~
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#### Cloning and Importing
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You can also clone the repository and import the module
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~~~PowerShell
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git clone https://github.com/PowerShellWeb/Turtle
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cd ./Turtle
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Import-Module ./ -Force -PassThru
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~~~
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### Getting Started
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Once we've imported Turtle, we can create any number of turtles, and control them with commands and methods.
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#### Drawing Squares
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![Turtle Square](data:image/svg+xml;base64,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)
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Let's start simple, by drawing a square.
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~~~PowerShell
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New-Turtle |
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Move-Turtle Forward 10 |
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Move-Turtle Rotate 90 |
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Move-Turtle Forward 10 |
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Move-Turtle Rotate 90 |
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Move-Turtle Forward 10 |
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Move-Turtle Rotate 90 |
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Move-Turtle Forward 10 |
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Move-Turtle Rotate 90 |
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Save-Turtle "./Square.svg"
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~~~
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We can also write this using a method chain:
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~~~PowerShell
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$turtle = New-Turtle
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$turtle.
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Forward(10).Rotate(90).
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Forward(10).Rotate(90).
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Forward(10).Rotate(90).
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Forward(10).Rotate(90).
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Symbol.Save("$pwd/Square.svg")
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~~~
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This just demonstrates how we can construct shapes out of these two simple primitive steps.
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We can also just say, make a square directly:
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~~~PowerShell
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New-Turtle | Move-Turtle Square 10 | Save-Turtle ./Square.svg
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~~~
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We can use loops:
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~~~PowerShell
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$turtle = New-Turtle
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foreach ($n in 1..6) {
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$turtle = $turtle.Forward(10).Rotate(60)
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}
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$turtle |
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Save-Turtle "./Hexagon.svg"
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~~~
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![Turtle Hexagon](data:image/svg+xml;base64,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)

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