74 lines
1.8 KiB
Markdown
74 lines
1.8 KiB
Markdown
# Scroll Image
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The scroll image function.
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Scrolls the frames within an [Image](/reference/images/image) on the [LED screen](/device/screen).
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### Block Editor
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### JavaScript
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```
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export function scrollImage(_this: micro_bit.Image, xOffsetPerStep: number, interval: number)
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```
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### Parameters
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* x offset per step : [Number](/reference/types/number) - the number of columns to scroll at a time (horizontal offset). Use a positive number to scroll an image to the right and a negative number to scroll left. To jump from one image frame to the next, use an offset of 5 or -5.
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* interval (ms) : [Number](/reference/types/number) - the time (in milliseconds) before scrolling by `x offset per step`; the larger the number, the slower the scroll.
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### ~hide
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```
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let img = images.createImage(`
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. . # . . . # # # . . # # # .
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. . # . . . . . # . . . . # .
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. . # . . . . # . . . # # # .
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. . # . . . # . . . . . . # .
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. . # . . . # # # . . # # # .
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`)
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```
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### ~
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To scroll an image 1 column at a time to the right:
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```
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img.scrollImage(1, 1000)
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```
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To scroll an image 5 columns at a time (skip from frame to frame):
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```
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img.scrollImage(5, 1000)
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```
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To scroll an image 1 column at a time to the left:
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```
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img.scrollImage(-1, 500)
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```
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### Example: scroll through frames
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This example creates an image with 3 frames, then scrolls through the 3 frames:
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```
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img = images.createImage(`
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. . # . . . # # # . . # # # .
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. . # . . . . . # . . . . # .
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. . # . . . . # . . . # # # .
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. . # . . . # . . . . . . # .
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. . # . . . # # # . . # # # .
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`)
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img.showImage(0)
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img.scrollImage(5, 1000)
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```
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### See also
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[show image](/reference/images/show-image), [image](/reference/images/image), [create image](/reference/images/create-image), [show animation](/reference/basic/show-animation)
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