Computer programming with murtle the turtle
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computer programming with murtle the turtle. a program is a set of instructions. that tells a computer what to do. java is a programming language. java is object-oriented. an object is a thing,. like a cookie. an object belongs to a class . a class is like a cookie-cutter.

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computer programming with murtle the turtle


a program is a set of instructions

that tells a computer what to do.


java is a programming language.

java is object-oriented.


an object is a thing,

like a cookie.


an object belongs to a class.

a class is like a cookie-cutter.


how many cookies can you make

with one cookie-cutter?


objects can do things.

drive

?

?

park

turn

?

methods define what an object can do.


meet murtle.

murtle is an object.


murtle belongs to the GTurtle class.

GTurtle

murtle

yurtle

harry


create murtle.

GTurtle murtle = new GTurtle();


murtle lives in a window.


add murtle to the window.

0

100

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add(murtle);


See murtle appear.

  • Press Ctrl+1 to compile your code

    • If you see an error message

      • Double-click on the first line of the error to return to the code.

      • See if you can correct the problem.

        • Pay attention to spelling and upper/lower case!

      • Try to compile again (Ctrl+1)

      • Continue until you see no more errors.

  • Press Ctrl+3 to run your program


murtle has methods,

see murtle grow.

murtle.setSize(50);

see murtle spin.

murtle.right(360);

see murtle move.

murtle.forward(100);

so she can do things.


see murtle move.

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Don’t forget!Ctrl+1 to compileCtrl+3 to run

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murtle.setLocation(200, 150);


see murtle draw.

murtle.penDown();

murtle.forward(100);


see murtle turn.

90o

180o

0o

270o

murtle.right(90);


Can you make murtle draw a square?


murtle gets colorful.

Built-in colors:

BLACK

BLUE

CYAN

GRAY

GREEN

MAGENTA

ORANGE

PINK

RED

WHITE

YELLOW

murtle.setColor(Color.BLUE);


murtle gets loopy!

  • Draw a square

  • //Draw a square

  • for (int j = 1; j <= 4; j++)

  • {

  • murtle.forward(100);

  • murtle.right(90);

  • }

  • 2. How would you change the loop to draw:

    • a pentagon?

    • a hexagon?

    • an octagon?


murtle gets loopier!

//Draw a bunch of squares

for (int i = 0; i < 36; i++)

{

//Draw a square

for (int j = 0; j < 4; j++)

{

murtle.forward(80);

murtle.right(90);

}

murtle.right(10);

}


goodbye murtle!


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