pxt-calliope/docs/reference/js/image.md

72 lines
2.6 KiB
Markdown
Raw Normal View History

2016-03-26 00:47:20 +01:00
# Image
2016-04-02 01:22:47 +02:00
An image for the micro:bit screen.
2016-03-26 00:47:20 +01:00
### @parent js/language
An *Image* is a matrix of pixels to show on the [LED screen](/microbit/device/screen)
### Touch Develop editor: plot an image
To display an image using the [Touch Develop editor](/microbit/js/editor):
* click `image` , `plot image`, and then `edit`
* click the rectangles to create an image
* when you're done, click **ok** to return to your code
![](/static/mb/plot-leds-0.png)
You should see code similar to this:
```
basic.plotImage(`
. . . . .
. # . # .
. . # . .
. # . # .
. . . . .
`)
```
### Creating an image
To create an image that you can later modify, see the [create image](/microbit/reference/images/create-image) function.
### Block editor: create and show images
To create images using the [Block editor](/microbit/blocks/editor):
1. Click the **Images** category on the left.
2. Drag and drop the **show image** block into your code.
3. Drag and drop the **create image** or **create big image** block onto the **show image** block so that they connect.
4. Make an image on the **create image** block by clicking on the squares.
### Global image variables
Images that you create in the [Touch Develop editor](/microbit/js/editor) are [local variables](/microbit/reference/variables/var). To promote a local image variable to a global variable, select the local image variable and click `promote to data`. The *var* keyword changes to the [data](/microbit/js/data) symbol `data->`.
### Image functions
* [create image](/microbit/reference/images/create-image): create an image from a series of on/off LED states
* [clear](/microbit/reference/basic/clear-screen): turn off all the pixels in an image
* [set pixel](/microbit/reference/images/set-pixel): set the state of a pixel in an image
* [pixel](/microbit/reference/images/pixel): get the state of a pixel in an image
* [plot-image](/microbit/reference/led/plot-image): show a single-frame image on the LED screen
* [show animation](/microbit/reference/basic/show-animation): show a series of image frames
* [show image](/microbit/reference/images/show-image): show an image on the screen
* [scroll image](/microbit/reference/images/scroll-image): scroll an image on the screen
* [width](/microbit/functions/width): get the width of an image
### Lessons
* [bounce image ](/microbit/lessons/bounce-image)
* [offset image](/microbit/lessons/offset-image)
### See also
[plot image](/microbit/reference/led/plot-image), [create image](/microbit/reference/images/create-image), [show image](/microbit/reference/images/show-image), [LED screen](/microbit/device/screen)