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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Presentation Transcript
slide2

a program is a set of instructions

that tells a computer what to do.

slide3

java is a programming language.

java is object-oriented.

slide4

an object is a thing,

like a cookie.

slide5

an object belongs to a class.

a class is like a cookie-cutter.

slide6

how many cookies can you make

with one cookie-cutter?

slide7

objects can do things.

drive

?

?

park

turn

?

methods define what an object can do.

slide8

meet murtle.

murtle is an object.

slide9

murtle belongs to the GTurtle class.

GTurtle

murtle

yurtle

harry

slide10

create murtle.

GTurtle murtle = new GTurtle();

slide12

add murtle to the window.

0

100

200

300

400

100

200

300

add(murtle);

slide13

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
slide14

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.

slide15

see murtle move.

0

100

200

300

400

100

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

200

300

murtle.setLocation(200, 150);

slide16

see murtle draw.

murtle.penDown();

murtle.forward(100);

slide17

see murtle turn.

90o

180o

0o

270o

murtle.right(90);

slide19

murtle gets colorful.

Built-in colors:

BLACK

BLUE

CYAN

GRAY

GREEN

MAGENTA

ORANGE

PINK

RED

WHITE

YELLOW

murtle.setColor(Color.BLUE);

slide20

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?
slide21

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);

}

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