2b504d863d
* a few updates * more updates * reorder radio blocks * more shuffling of new radio apis * fixing hot or ocold * more doc fixes * more updates * fixing docs issues * more doc fixes * restore docs errors * missing packate * renamed argument of callback * mssing radio * more odcs fixes * lock turtle * ignore docs for now
79 lines
1.8 KiB
Markdown
79 lines
1.8 KiB
Markdown
# Turtle Square
|
|
|
|
## Introduction @unplugged
|
|
|
|
Imagine that a virtual turtle, as big as an LED, that you can control it with commands.
|
|
In this tutorial, you will learn to use the turtle and draw a square.
|
|
|
|
## Moving the turtle @fullscreen
|
|
|
|
The turtle starts in the center of the screen facing up. Place a ``||turtle:forward||`` block to make it move up.
|
|
|
|
```blocks
|
|
turtle.forward(1)
|
|
```
|
|
|
|
## Turning and moving @fullscreen
|
|
|
|
Place a ``||turtle:turnRight||`` to turn the turtle and place another ``||turtle:forward||`` block to make it move again.
|
|
|
|
```blocks
|
|
turtle.forward(1)
|
|
turtle.turnRight()
|
|
turtle.forward(1)
|
|
```
|
|
|
|
## Drawing a square
|
|
|
|
If you add enough ``||turtle:turnRight||`` and ``||turtle:forward||`` block, the turtle
|
|
will eventually draw a square.
|
|
|
|
You can move the blocks in a ``||input:on button pressed||`` to easily run the code again.
|
|
|
|
```blocks
|
|
input.onButtonPressed(Button.A, function() {
|
|
turtle.forward(1)
|
|
turtle.turnRight()
|
|
turtle.forward(1)
|
|
turtle.turnRight()
|
|
turtle.forward(1)
|
|
turtle.turnRight()
|
|
turtle.forward(1)
|
|
turtle.turnRight()
|
|
})
|
|
```
|
|
|
|
## "For" is for repetition
|
|
|
|
Have you notice the repetition pattern in the blocks needed to draw a square?
|
|
Try to use a ``for`` loop to achieve the same effect.
|
|
|
|
```blocks
|
|
input.onButtonPressed(Button.A, function() {
|
|
for(let i = 0; i <=4; ++i) {
|
|
turtle.forward(1)
|
|
turtle.turnRight()
|
|
}
|
|
})
|
|
```
|
|
|
|
|
|
## Leaving a trail
|
|
|
|
The turtle holds a pen that turns on LEDs. If you add the ``||turtle:pen||`` block,
|
|
it will leave a trail as it moves.
|
|
|
|
```blocks
|
|
input.onButtonPressed(Button.A, function() {
|
|
turtle.pen(TurtlePenMode.Down)
|
|
for(let i = 0; i <=4; ++i) {
|
|
turtle.forward(1)
|
|
turtle.turnRight()
|
|
}
|
|
})
|
|
```
|
|
|
|
```package
|
|
microturtle=github:Microsoft/pxt-microturtle#v0.0.9
|
|
```
|