95 lines
1.9 KiB
Markdown
95 lines
1.9 KiB
Markdown
# offset image challenges
|
|
|
|
Coding challenges for the offset image tutorial. #docs
|
|
|
|
## Before we get started
|
|
|
|
Complete the following exercise. Your code should look like this:
|
|
|
|
```blocks
|
|
offset = 0
|
|
basic.forever(() => {
|
|
if (offset == -4) {
|
|
basic.showString("Push button A", 150)
|
|
}
|
|
images.createImage(`
|
|
. . # . .
|
|
. . # . .
|
|
. . # . .
|
|
. # # # .
|
|
. . # . .
|
|
`).showImage(offset)
|
|
})
|
|
input.onButtonPressed(Button.A, () => {
|
|
offset = offset + 1
|
|
})
|
|
```
|
|
|
|
### Challenge 1
|
|
|
|
Create a condition for if button `B` is pressed. We want the image to move to the left when button `B` is pressed.
|
|
|
|
```
|
|
offset = 0
|
|
basic.forever(() => {
|
|
if (offset == -4) {
|
|
basic.showString("Push button A", 150)
|
|
}
|
|
images.createImage(`
|
|
. . # . .
|
|
. . # . .
|
|
. . # . .
|
|
. # # # .
|
|
. . # . .
|
|
`).showImage(offset)
|
|
})
|
|
input.onButtonPressed(Button.A, () => {
|
|
offset = offset + 1
|
|
})
|
|
input.onButtonPressed(Button.B, () => {
|
|
offset = offset - 1 // ***
|
|
}) // ***
|
|
```
|
|
|
|
* Run the code to see if it works as expected.
|
|
|
|
### Challenge 2
|
|
|
|
|
|
|
|
Now we want to make sure that the button does not go off the screen to the right. Add a new line that checks to see if offset = 5 after button `A` is pressed.
|
|
|
|
If `offset = 5` then prompt the user to move the image to the left by displaying the text: "Push button B".
|
|
|
|
```
|
|
offset = 0
|
|
basic.forever(() => {
|
|
if (offset == -4) {
|
|
basic.showString("Push button A", 150)
|
|
}
|
|
if (offset == 5) {
|
|
basic.showString("Press Button B", 150) // ***
|
|
}
|
|
images.createImage(`
|
|
. . # . .
|
|
. . # . .
|
|
. . # . .
|
|
. # # # .
|
|
. . # . .
|
|
`).showImage(offset)
|
|
})
|
|
input.onButtonPressed(Button.A, () => {
|
|
offset = offset + 1
|
|
})
|
|
input.onButtonPressed(Button.B, () => {
|
|
offset = offset - 1
|
|
})
|
|
```
|
|
|
|
* Run the code to see if it works as expected.
|
|
|
|
### Challenge 3
|
|
|
|
Now make sure the image does not go off the left side and if it does, prompt the user to push button `A`.
|
|
|