Woopec - Turtle-Class

Introduction

The structure of the Woopec Turtle commands was largely taken over from pyhton-Turtle-Graphics. Some things have been adapted to C# (upper/lower case, properties). The range of functions does not come close to that of the great python library. But it’s a first step.

Examples

Let’s start with a simple example:

    var turtle = Turtle.Seymour();

    turtle.Right(45);
    turtle.Forward(50);
    turtle.Left(90);
    turtle.Forward(100);
    turtle.Right(45);
    turtle.Forward(20);

This code produces the following result:

Woopec C# turtle graphics, result of simple example

The previous example used a predefined turtle Turtle.Seymour(). It is also possible to create several turtles. The following example creates two turtles, cynthia and wally. In this example at first cynthia will turn left and move forward, and then wally will turn right and move forward:

    var cynthia = new Turtle();
    cynthia.Speed = Speeds.Slowest;
    cynthia.Left(90);
    cynthia.Forward(200);

    var wally = new Turtle();
    wally.Speed = Speeds.Slowest;
    wally.Right(90);
    wally.Forward(200);

More information on handling multiple Turtles can be found here.

How to write your own program?

You only have to install Visual Studio and download the Woopec package. Getting started describes this in more detail.

Then you can write your first turtle program. Getting started describes this in more detail.

Your program must have a main-method named TurtleMain(), this method is started automatically:

    public static void TurtleMain()
    {
        var turtle = Turtle.Seymour();
        turtle.Forward(50);
    }

Because Woopec (currently) uses WPF, the code must run on a Windows Computer.

Overview of Methods

The following table gives a short overview of all methods. The methods are described in more detail by code comments. The IntelliSense-Feature of Visual Studio shows these comments when you move the mouse over the name of the method:

IntelliSense

Turtle class

Method	Description
Move, Draw and Position State:
Forward(double distance)	Move forward
Backward(double distance)	Move backward
Left(double angle)	Rotate left
Right(double angle)	Rotate right
SetPosition(Vec2D position) GoTo(Vec2D position)	Change position.
Position [Type is Vec2D]	Get or change position
SetHeading(double angle)	Change heading (rotate to this heading)
Heading [Type is double]	Get or change heading
Speed [Type is Speed]	Get or change speed
Drawing state:
PenUp()	Pull the pen down, drawing when moving
PenDown()	Pull the pen up, no drawing when moving
IsDown [Type is bool]	Get or change state of pen
Color control:
PenColor [Type is Color]	Pencolor
FillColor [Type is Color]	Fillcolor
Color [Type is Color]	Change pencolor and fillcolor
Visibility and appearance:
HideTurtle()	Make the turtle invisible
ShowTurtle()	Make the turtle visible
IsVisible (Type is bool)	True if turtle is shown, false if is hidden
Shape (Type is a Shape)	Get or change shape of the turtle
Filling:
BeginFill()	Start the filling
EndFill()	Fill the shape drawn after the last call of BeginFill()
Filling (Type is bool)	Return fillstate (true if filling, false else)
Other
Screen (Type is Screen)	The screen on which this turtle is drawn
WaitForCompletedMovementOf(Turtle otherTurtle)	Wait with next movement for completed movement of the otherTurtle

Screen class

Method	Description
TextInput(string title, string prompt) [Type is string]	Pop up a dialog window for input of a string. Returns the user-input
NumInput(string title, string prompt) [Type is int]	Pop up a dialog window for input of an integer number. Returns the user-input
DoubleInput(string title, string prompt) [Type is double]	Pop up a dialog window for input of a double number. Returns the user-input
Bye()	Shut the window

Shapes class

Method	Description
Add(string name, `List<Vec2D>` polygon)	Add a polygon to the shapelist
Add(string name, Shape shape)	Add a compound shape to the sapelist. A compound shape contains several polygons
Get(string name) [Type is Shape]	Get the shape of the given name
GetNames() [Type is `List<string>`]	Get a list of all currently available turtle shape-names