@johann01/react-native-mlkit-core
v0.7.9
Published
Shared Library for RNMLKit
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@infinitered/react-native-mlkit-core
Description
This is a shared library for RNMLKit that contains helper functions and shared code for various packages. It offers some helpful methods that are used by many apps on the React Native (JS) side and includes functionality to work with images and bounding boxes.
Installation
Use the following command to install the package:
npm install @infinitered/react-native-mlkit-core
Usage
RNMLKitImage
Swift
Use this class in Swift to create and manage images with MLKitVision. It provides utility methods for loading images and managing their vision representations.
import RNMLKitCore
let image = RNMLKitImage(imagePath: imagePath)
// ...
imagePath
- should be the localUri of the image to process. i.e.Asset.localUri
from an Expo Asset orImage.uri
from an ImagePickerAsset.
Kotlin
Use this class in Kotlin to create and manage images with MLKitVision. It provides utility methods for loading images and managing their vision representations.
import com.infinitered.reactnativemlkitcore.RNMLKitImage
val imageUri = Uri.parse(imagePath)
var image:InputImage = RNMLKitImage(imagePath, appContext.reactContext!!).image
// ...
imagePath
is the localUri of the image to process.Asset.localUri
from an Expo Asset orImage.uri
from an Expo ImagePickerAsset.appContext
is the AppContext from your expo module -- it's accessible as a property on the Module class.
React Components
BoundingBoxView
Renders a bounding box based on the specified dimensions and scale.
import { BoundingBoxView } from "@infinitered/react-native-mlkit-core";
// ...
<BoundingBoxView box={box} scale={scale} />;
box
is the bounding box to render of typeBoundingBox
/**
* Represents a bounding box with origin, size, color, label, and width properties.
*/
export interface BoundingBox {
origin: { x: number; y: number };
size: { x: number; y: number };
color?: string;
label?: string;
width?: number;
}
ImageWithBoundingBoxes
Renders an image with bounding boxes drawn over specified regions.
import { ImageWithBoundingBoxes } from "@infinitered/react-native-mlkit-core";
// ...
<ImageWithBoundingBoxes image={image} boundingBoxes={boundingBoxes} />;
boundingBoxes
is an array ofBoundingBox
objects to render over the image.image
is the image to render. Accepts anImage
fromexpo-image
Hooks
Several hooks are included to assist with layout and scaling:
useBoundingBoxStyle
: Calculates the style object for a bounding box.useImageScale
: Calculates the image scale based on the provided parameters.useLayout
: Handles layout change events.