diff --git a/docs/docs/guides/FOCUSING.mdx b/docs/docs/guides/FOCUSING.mdx index 408cd98..841b2a3 100644 --- a/docs/docs/guides/FOCUSING.mdx +++ b/docs/docs/guides/FOCUSING.mdx @@ -10,7 +10,7 @@ To focus the camera to a specific point, simply use the Camera's [`focus(...)`]( await camera.current.focus({ x: tapEvent.x, y: tapEvent.y }) ``` -The focus function expects a [`Point`](/docs/api/interfaces/Point) parameter which represents the location relative to the Camera view where you want to focus the Camera to (in _points_). If you use [react-native-gesture-handler](https://docs.swmansion.com/react-native-gesture-handler/), this will consist of the [`x`](https://docs.swmansion.com/react-native-gesture-handler/docs/next/gesture-handlers/api/tap-gh/#x) and [`y`](https://docs.swmansion.com/react-native-gesture-handler/docs/next/gesture-handlers/api/tap-gh/#y) properties of the tap event payload. +The focus function expects a [`Point`](/docs/api/interfaces/Point) parameter which represents the location relative to the Camera view where you want to focus the Camera to (in _points_). If you use [react-native-gesture-handler](https://github.com/software-mansion/react-native-gesture-handler/), this will consist of the [`x`](https://docs.swmansion.com/react-native-gesture-handler/docs/next/gesture-handlers/api/tap-gh/#x) and [`y`](https://docs.swmansion.com/react-native-gesture-handler/docs/next/gesture-handlers/api/tap-gh/#y) properties of the tap event payload. So for example, `{ x: 0, y: 0 }` will focus to the upper left corner, while `{ x: VIEW_WIDTH, y: VIEW_HEIGHT }` will focus to the bottom right corner. @@ -20,6 +20,43 @@ Focussing adjusts auto-focus (AF) and auto-exposure (AE). `focus(...)` will fail if the selected Camera device does not support focusing (see [`CameraDevice.supportsFocus`](/docs/api/interfaces/CameraDevice#supportsfocus)) ::: +## Example (Gesture Handler) + +This is an Example on how to use [react-native-gesture-handler](https://github.com/software-mansion/react-native-gesture-handler/) to focus the Camera to a specific point on the screen: + +```tsx +import { Camera, useCameraDevice } from 'react-native-vision-camera' +import { Gesture, GestureDetector } from 'react-native-gesture-handler' + +export function App() { + const camera = useRef(null) + const device = useCameraDevice('back') + + const focus = useCallback((point: Point) => { + const c = camera.current + if (c == null) return + c.focus() + }, []) + + const gesture = Gesture.Tap() + .onEnd(({ x, y }) => { + runOnJS(focus)({ x, y }) + }) + + if (device == null) return + return ( + + + + ) +} +``` +
#### 🚀 Next section: [Exposure](exposure) diff --git a/docs/docs/guides/ZOOMING.mdx b/docs/docs/guides/ZOOMING.mdx index 0bc7b93..8937c44 100644 --- a/docs/docs/guides/ZOOMING.mdx +++ b/docs/docs/guides/ZOOMING.mdx @@ -43,8 +43,7 @@ A Camera's `zoom` property is represented in a **logarithmic scale**. That means The above example only demonstrates how to animate the `zoom` property. To actually implement pinch-to-zoom or pan-to-zoom, take a look at the [VisionCamera example app](https://github.com/mrousavy/react-native-vision-camera/tree/main/package/example), the pinch-to-zoom gesture can be found [here](https://github.com/mrousavy/react-native-vision-camera/blob/main/package/example/src/views/CaptureButton.tsx#L189-L208), and the pan-to-zoom gesture can be found [here](https://github.com/mrousavy/react-native-vision-camera/blob/d8551792e97eaa6fa768f54059ffce054bf748d9/example/src/views/CaptureButton.tsx#L185-L205). They implement a real world use-case, where the maximum zoom value is clamped to a realistic value, and the zoom responds very gracefully by using a logarithmic scale. - -## Implementation (Reanimated) +## Example (Reanimated + Gesture Handler) While you can use any animation library to animate the `zoom` property (or use no animation library at all) it is recommended to use [react-native-reanimated](https://github.com/software-mansion/react-native-reanimated) to achieve best performance. Head over to their [Installation guide](https://docs.swmansion.com/react-native-reanimated/docs/installation) to install Reanimated if you haven't already. @@ -61,8 +60,8 @@ While you can use any animation library to animate the `zoom` property (or use n The following example implements a pinch-to-zoom gesture using [react-native-gesture-handler](https://github.com/software-mansion/react-native-gesture-handler/) and [react-native-reanimated](https://github.com/software-mansion/react-native-reanimated): ```tsx -import { Camera, useCameraDevice, CameraProps } from "react-native-vision-camera" -import Reanimated, { useAnimatedProps, useSharedValue } from "react-native-reanimated" +import { Camera, useCameraDevice, CameraProps } from 'react-native-vision-camera' +import Reanimated, { useAnimatedProps, useSharedValue } from 'react-native-reanimated' import { Gesture, GestureDetector } from 'react-native-gesture-handler' Reanimated.addWhitelistedNativeProps({