4a3ce4cc1d
Add comprehensive reference documentation for: - Vitest: environments, projects/workspaces, type testing, vi utilities - Pinia: HMR, Nuxt integration, SSR setup - Vue: built-in components (Transition, Teleport, Suspense, KeepAlive) and advanced directives
39 lines
799 B
Markdown
39 lines
799 B
Markdown
---
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category: '@Math'
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related: createGenericProjection
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---
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# useProjection
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Reactive numeric projection from one domain to another.
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## Usage
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```ts
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import { useProjection } from '@vueuse/math'
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const input = ref(0)
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const projected = useProjection(input, [0, 10], [0, 100])
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input.value = 5 // projected.value === 50
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input.value = 10 // projected.value === 100
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```
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## Type Declarations
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```ts
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/**
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* Reactive numeric projection from one domain to another.
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*
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* @see https://vueuse.org/useProjection
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*
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* @__NO_SIDE_EFFECTS__
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*/
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export declare function useProjection(
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input: MaybeRefOrGetter<number>,
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fromDomain: MaybeRefOrGetter<readonly [number, number]>,
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toDomain: MaybeRefOrGetter<readonly [number, number]>,
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projector?: ProjectorFunction<number, number>,
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): ComputedRef<number>
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```
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