huawei_ar 2.13.0+5

Huawei AR Engine Flutter Plugin is a platform for building augmented reality (AR) apps on Android smartphones using the Flutter framework.

Huawei AR Kit Flutter Plugin

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Contents

• 1. Introduction
• 2. Installation Guide
• 3. API Reference
• 4. Configuration and Description
• 5. Sample Project
• 6. Questions or Issues
• 7. Licensing and Terms

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1. Introduction

HUAWEI AR Kit Plugin for Flutter is a platform for building augmented reality (AR) applications on Android devices using the Flutter framework. It is based on the HiSilicon chipset, and integrates AR core algorithms to provide basic AR capabilities such as motion tracking, environment tracking, body tracking, and face tracking. It allows your app to bridge virtual world with the real world, for a brand new visually interactive user experience.

This plugin enables communication between the HUAWEI AR Engine SDK and the Flutter platform. It exposes all functionality provided by the HUAWEI AR Engine SDK.

Restrictions:

Supported Devices

Brand/Series	Device Model
HUAWEI P series	P40, P40 Pro, P40 Pro+, P30, P30 Pro, P20, P20 Pro
HUAWEI Mate series	Mate 30, Mate 30 Pro, Mate 30 RS, Mate 30 (5G), Mate 30 Pro (5G) , Mate X, Mate Xs, Mate 20 X (5G), Mate RS, Mate 20 X, Mate 20, Mate 20 Pro, Mate 20 RS
HUAWEI nova series	nova 7, nova 7 Pro, nova 6, nova 6 Pro, nova 4, nova 3
HONOR phones	HONOR 30, HONOR 30 Pro, HONOR 30 Pro+, HONOR 30S, HONOR View30, HONOR View30 Pro, HONOR 20, HONOR 20 Pro, HONOR View20, HONOR 9X
Tablet	HUAWEI MediaPad M6, HUAWEI MatePad Pro

Supported Locations

For details about the supported locations, please refer to Supported Locations.

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2. Installation Guide

On your Flutter project directory, find and open your pubspec.yaml file and add the huawei_ar library to dependencies. For more details please refer to the Using packages document.

• To download the package from pub.dev.

    dependencies:
      huawei_ar: {library version}
  

• Or if you downloaded the package from the HUAWEI Developer website, specify the library path on your local device.

    dependencies:
      huawei_ar:
          # Replace {library path} with actual library path of Huawei AR Kit Plugin for Flutter.
          path: {library path}
  

  • Replace {library path} with the actual library path of Flutter AR Plugin. The following are examples:
    • Relative path example: path: ../huawei_ar
    • Absolute path example: path: D:\Projects\Libraries\huawei_ar

Run the following command to update package info.

[project_path]> flutter pub get

Import the library to access the methods.

import 'package:huawei_ar/ar_engine_library.dart';

Run the following command to start the app.

[project_path]> flutter run

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3. API Reference

AREngine

Contains methods for setting up the AR Engine.

Public Method Summary

Method	Return Type	Description
isAREngineServiceApkReady()	Future<bool>	Checks if the AR Engine Service APK is ready.
navigateToAppMarketPage()	Future<void>	Navigates to the AR Engine AppGallery page for downloading the AR Engine Service APK.
hasCameraPermission()	Future<bool>	Checks if the camera permission is granted.
requestCameraPermission()	Future<void>	Requests the camera permission which is required to display an AREngineScene.
enableLogger()	Future<void>	Enables HMS Plugin Method Analytics.
disableLogger()	Future<void>	Disables HMS Plugin Method Analytics.

Public Methods

Future<bool> isAREngineServiceApkReady async

The AR Engine needs the AR Engine Service APK installed on the device before using the AR capabilities. This method checks if the service APK is already installed on the device.

Return Type

Type	Description
Future<bool>	True if the AR Engine Service APK is installed and ready, false otherwise.

Call Example

_checkServiceApk() async {
  bool result = await AREngine.isArEngineServiceApkReady();
  // Navigate to the AppGallery for AR Engine Service APK Download if result is false
}

Future<void> navigateToAppMarketPage async

Opens the AR Engine Service APK AppGallery Page. If the device doesn't support the AR Engine, AppGallery would display application not available message.

Return Type

Type	Description
Future<void>	Future result of an execution that returns no value.

Call Example

_checkServiceApk() async {
  bool result = await AREngine.isArEngineServiceApkReady();
  if(!result) {
      AREngine.navigateToAppMarketPage();
  }
}

Future<bool> hasCameraPermission async

Checks if the camera permission is given.

Return Type

Type	Description
Future<bool>	True if the camera permission is given, false otherwise.

Call Example

_checkCameraPermission() async {
  bool result = await AREngine.hasCameraPermission();
 // Request for camera permission if result is false.
}

Future<void> requestCameraPermission async

Requests the camera permission which is required to display the AREngineScene.

Note: AREngineScene widget automatically checks for the camera permission and requests the permission if it has not given at the moment.

Return Type

Type	Description
Future<void>	Future result of an execution that returns no value.

Call Example

_checkCameraPermission() async {
  bool result = await AREngine.hasCameraPermission();
  if(!result) {
      AREngine.requestCameraPermission();
  }
}

Future<void> enableLogger async

This method enables the HMSLogger capability which is used for sending usage analytics of AR Engine SDK's methods to improve the service quality.

Return Type

Type	Description
Future<void>	Future result of an execution that returns no value.

Call Example

AREngine.enableLogger(); // Enables HMSLogger

Future<void> disableLogger async

This method disables the HMSLogger capability which is used for sending usage analytics of AR Engine SDK's methods to improve the service quality.

Return Type

Type	Description
Future<void>	Future result of an execution that returns no value.

Call Example

AREngine.disableLogger(); // Disables HMSLogger

AREngineScene

Flutter widget which displays an AR Engine Scene. The scene will open and display the camera of the device for AR interactions.

Public Properties

Click to expand/collapse table

Name	Type	Description	Required
key	Key	Optional key for the AREngineScene widget.	No
height	double	Height of the AREngineScene widget.	No
width	double	Width of the AREngineScene widget.	No
arSceneType	ARSceneType	Determines the AR scene type. Check ARSceneType for the options.	Yes
arSceneConfig	ARSceneBaseConfig	Configurations which are specific to defined ARSceneType.	Yes
onARSceneCreated	Function(ARSceneController arSceneController)	A callback function which is called on widget creation and returns an ARSceneController instance.	No
notSupportedText	String	Text to display when the device platform doesn't support Huawei AR Engine.	No
permissionTitleText	String	Title of the text that displayed when the camera permission is needed.	No
permissionBodyText	String	Body message of the text that displayed when the camera permission is needed.	No
permissionButtonText	String	Text of the button which requests the camera permission.	No
notSupportedTextStyle	TextStyle	TextStyle for notSupportedText.	No
permissionTitleTextStyle	TextStyle	TextStyle for permissionTitleText.	No
permissionBodyTextStyle	TextStyle	TextStyle for permissionBodyText.	No
permissionButtonTextStyle	TextStyle	TextStyle for permissionButtonText.	No
permissionButtonColor	Color	Color of the permissionButton.	No
permissionMessageBgColor	Color	Background color of the permission message container.	No

Public Constructor Summary

Signature

Description

AREngineScene(ARSceneType arSceneType, ARSceneBaseConfig arSceneConfig, {Key key, double height, double width, Function(ARSceneController arSceneController) onARSceneCreated, String notSupportedText, String permissionTitleText, String permissionBodyText, String permissionButtonText, TextStyle permissionTitleTextStyle, TextStyle permissionBodyTextStyle, TextStyle notSupportedTextStyle, TextStyle permissionButtonTextStyle, Color permissionButtonColor, Color permissionMessageBgColor})

Creates an AREngineScene widget instance.

Public Constructors

AREngineScene(ARSceneType arSceneType, ARSceneBaseConfig arSceneConfig, {Key key, double height, double width, Function(ARSceneController arSceneController) onARSceneCreated, String notSupportedText, String permissionTitleText, String permissionBodyText, String permissionButtonText, TextStyle permissionTitleTextStyle, TextStyle permissionBodyTextStyle, TextStyle notSupportedTextStyle, TextStyle permissionButtonTextStyle, Color permissionButtonColor, Color permissionMessageBgColor})

Constructs an AREngineScene widget with the specified parameters.

• For parameter descriptions, see public properties.

Usage Example

import 'package:flutter/material.dart';
import 'package:huawei_ar/ar_engine_library.dart';

class ArBodyScene extends StatefulWidget {
  ArBodyScene({Key key}) : super(key: key);

  @override
  _ArBodySceneState createState() => _ArBodySceneState();
}

class _ArBodySceneState extends State<ArBodyScene> {
  ARSceneController arSceneController;

  _onARSceneCreated(ARSceneController controller) {
    arSceneController = controller;
    arSceneController.onDetectTrackable =
        (arHand) => _bodyDetectCallback(arHand);
  }

  _bodyDetectCallback(ARBody arBody) {
    print("ARBody detected: " + arBody?.toString());
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SafeArea(
          child: AREngineScene(
            ARSceneType.BODY,
            ARSceneBodyConfig(
              drawLine: true,
              drawPoint: true,
              lineWidth: 10.0,
              pointSize: 20.0,
              lineColor: Colors.green,
              pointColor: Colors.amber,
            ),
            onArSceneCreated: _onARSceneCreated,
          ),
        ),
    );
  }
}

enum ARSceneType

Specifies the AREngineScene type.

Value	Description
HAND	ARHandScene option for the AREngineScene Widget.
FACE	ARFaceScene option for the AREngineScene Widget.
BODY	ARBodyScene option for the AREngineScene Widget.
WORLD	ARWorldScene option for the AREngineScene Widget.

ARSceneBaseConfig

Abstract class for AREngineScene widget's scene configurations. The different scene configuration classes for ARSceneTypes HAND, BODY, FACE and WORLD, inherits from this base class.

Public Constants

Constant	Type	Description
defaultRed	Color	Default red color.
defaultWhite	Color	Default white color.
defaultBlue	Color	Default blue color.
defaultGreen	Color	Default green color.

Public Method Summary

Method	Return Type	Description
getARSceneType	ARSceneType	Obtains the scene type.
getARSceneConfig	String	Obtains the json string representation of the ARSceneConfig.

Public Methods

ARSceneType getARSceneType

Obtains the scene type of the scene configuration object.

Return Type

Type	Description
ARSceneType	Scene Type.

String getARSceneConfig

Obtains the json string representation of the scene configuration object.

Return Type

Type	Description
String	Json string representation of an ARSceneBaseConfig object.

ARSceneHandConfig

Scene configurations for an AREngineScene with the type ARSceneType.HAND. Implements the ARSceneBaseConfig.

Public Properties

Name	Type	Description
enableBoundingBox	bool	If set to true or not specified, a bounding box around the hand will be drawn when a hand gesture is recognized.
boxColor	Color	Color of the bounding box.
lineWidth	double	Line width of the bounding box.

Public Constructor Summary

Signature	Description
ARSceneHandConfig({bool enableBoundingBox, Color boxColor, double lineWidth })	Creates an ARSceneHandConfig instance.

Public Constructors

ARSceneHandConfig({bool enableBoundingBox, Color boxColor, double lineWidth })

Constructs an ARSceneHandConfig instance with the specified parameters.

• For parameter descriptions, see public properties.

ARSceneFaceConfig

Scene configurations for an AREngineScene with the type ARSceneType.FACE. Implements the ARSceneBaseConfig.

Public Properties

Name	Type	Description
drawFace	bool	If set true or not specifed, A face mask will be drawn on a detected face.
depthColor	Color	Set color of face mask points.
pointSize	double	Set point size of face mask points.
texturePath	String	A texture asset's path, that will be shown on the detected face.

Public Constructor Summary

Signature	Description
ARSceneFaceConfig({bool drawFace, Color depthColor, double pointSize, String texturePath })	Creates an ARSceneFaceConfig instance.

Public Constructors

ARSceneFaceConfig({bool drawFace, Color depthColor, double pointSize, String texturePath })

Constructs an ARSceneFaceConfig instance with the specified parameters.

• For parameter descriptions, see public properties.

ARSceneBodyConfig

Scene configurations for an AREngineScene with the type ARSceneType.BODY. Implements the ARSceneBaseConfig.

Public Properties

Name	Type	Description
drawLine	bool	If set to true or not specifed, skeleton connection lines will be drawn when a person is detected.
drawPoint	bool	If set to true or not specified, skeleton connection points will be drawn when a person is detected.
pointSize	double	Point size of the skeleton connection points.
lineWidth	double	Line width of the skeleton connection lines.
lineColor	Color	Skeleton connection line color.
pointColor	Color	Skeleton connection point color.

Public Constructor Summary

Signature	Description
ARSceneBodyConfig({bool drawLine, bool drawPoint, double pointSize, double lineWidth, Color lineColor, Color pointColor })	Creates an ARSceneBodyConfig instance.

Public Constructors

ARSceneBodyConfig({bool drawLine, bool drawPoint, double pointSize, double lineWidth, Color lineColor, Color pointColor })

Constructs an ARSceneBodyConfig instance with the specified parameters.

• For parameter descriptions, see public properties.

ARSceneWorldConfig

Scene configurations for an AREngineScene with the type ARSceneType.WORLD. Implements the ARSceneBaseConfig.

Public Properties

Click to expand/collapse table

Name	Type	Description
objPath	String	Virtual object file asset path. When object file path is given you can put that object in the AREngineScene. The object should be in waveform object (.obj) format.
texturePath	String	Virtual object texture file asset path. This texture will be rendered to the given virtual object.
drawLabel	bool	If set to true a label will be drawn when the plane is detected.
imageOther	String	Path of the image to be displayed when other plane type is detected.
imageWall	String	Path of the image to be displayed when wall plane is detected.
imageFloor	String	Path of the image to be displayed when floor plane is detected.
imageSeat	String	Path of the image to be displayed when seat plane is detected.
imageTable	String	Path of the image to be displayed when table plane is detected.
imageCeiling	String	Path of the image to be displayed when ceiling plane is detected.
textOther	String	Text to be displayed when other plane is detected.
textWall	String	Text to be displayed when wall plane is detected.
textFloor	String	Text to be displayed when floor plane is detected.
textSeat	String	Text to be displayed when seat plane is detected.
textTable	String	Text to be displayed when table plane is detected.
textCeiling	String	Text to be displayed when ceiling plane is detected.
colorOther	Color	Text color when other plane is detected.
colorWall	Color	Text color when wall plane is detected.
colorFloor	Color	Text color when floor plane is detected.
colorSeat	Color	Text color when seat plane is detected.
colorTable	Color	Text color when table plane is detected.
colorCeiling	Color	Text color when ceiling plane is detected.

Public Constructor Summary

Signature

Description

ARSceneWorldConfig({String objPath, String texturePath, bool drawLabel, String imageOther, String imageWall, String imageFloor, String imageSeat, String imageTable, String imageCeiling, String textOther, String textWall, String textFloor, String textSeat, String textTable, String textCeiling, Color colorOther, Color colorWall, Color colorFloor, Color colorSeat, Color colorTable, Color colorCeiling })

Creates an ARSceneWorldConfig instance.

Public Constructors

ARSceneWorldConfig({String objPath, String texturePath, bool drawLabel, String imageOther, String imageWall, String imageFloor, String imageSeat, String imageTable, String imageCeiling, String textOther, String textWall, String textFloor, String textSeat, String textTable, String textCeiling, Color colorOther, Color colorWall, Color colorFloor, Color colorSeat, Color colorTable, Color colorCeiling })

Constructs an ARSceneWorldConfig instance with the specified parameters.

• For parameter descriptions, see public properties.

ARSceneController

Controller class for the AREngineScene widget which can return ARTrackable objects based on the ARSceneType.

Public Properties

Name	Type	Description
onDetectTrackable	Function(ARTrackableBase arTrackable)	Callback function which returns an arTrackable object depending on the current ARSceneType.

Public Method Summary

Method	Return Type	Description
dispose	void	Disposes the current AREngineScene.

Public Methods

void dispose

Disposes the current AREngineScene which the controller is attached to.

ARTrackableBase

Abstract base class for ARTrackables which are ARHand, ARFace, ARBody and ARPlane.

Public Properties

Name	Type	Description
anchors	List<ARAnchor>	All anchor data associated to the current trackable object.
trackingState	TrackingState	Status of the current trackable.

Public Constants

enum TrackingState

The tracking status of the trackable object.

Value	Description
UNKNOWN_STATE	Unknown State.
TRACKING	Tracking Status.
PAUSED	Paused Status.
STOPPED	Stopped Status.

ARAnchor

Represents an anchor at a fixed location and a specified direction in an actual environment. HUAWEI AR Engine continuously updates this value so that the location and direction remains unchanged even when the environment changes, for example, as the camera moves. Before using methods in this class, call trackingState to check the anchor status. The data obtained through arPose is valid only when the anchor status is TrackingState.TRACKING.

Public Properties

Name	Type	Description
arPose	ARPose	Returns the location and the pose of the anchor point in the world coordinate system.
trackingState	TrackingState	Status of the current trackable.

Public Method Summary

Name	Return Type	Description
toMap	Map<String, dynamic>	Returns the map representation of the current ARAnchor object.
toString	String	Returns the string representation of the current ARAnchor object.
== (equals operator)	bool	Compares whether two ARAnchor objects correspond to the same anchor.
hashCode	int	Returns the hash code of the current ARAnchor object.

Public Methods

Map<String, dynamic> toMap

Converts the current ARAnchor object to a Map.

Return Type

Type	Description
Map<String, dynamic>	Map representation of the current ARAnchor object.

String toString

Converts the current ARAnchor object to a string.

Return Type

Type	Description
String	String representation of the current ARAnchor object.

bool ==(Object other) (equals operator)

Compares whether two ARAnchor objects correspond to the same anchor.

Parameters

Name	Description
other	Any object to compare with the current ARAnchor instance.

Return Type

Type	Description
bool	True if two ARAnchor objects are the same, false otherwise.

int hashCode

Returns the hashCode of the current object. The same value is returned for objects correspond to the same real world anchor.

Return Type

Type	Description
int	Hash code that is generated from the values of the ARAnchor instance.

ARPose

Represents the pose data, including a translation vector and a rotation vector (quaternion).

Public Constants

Constant	Type	Description
IDENTITY_TRANSLATION	List<double>	Identity translation with values X: 0, Y: 0, Z: 0.
IDENTITY_ROTATION	List<double>	Identity rotation with values X: 0, Y: 0, Z: 0, W: 1.
IDENTITY	ARPose	Indicates the identity pose (transformed from local coordinate system to world coordinate system). The values are IDENTITY_TRANSLATION and IDENTITY_ROTATION.

Public Properties

Name	Type	Description
translation	List<double>	Indicates the translation from the destination coordinate system to the local coordinate system.
rotation	List<double>	Indicates the rotation variable, which is a Hamilton quaternion.

Public Method Summary

Name	Return Type	Description
toMap	Map<String, dynamic>	Returns the map representation of the current ARPose object.
toString	String	Returns the string representation of the current ARPose object.

Public Methods

Map<String, dynamic> toMap

Converts the current ARPose object to a Map.

Return Type

Type	Description
Map<String, dynamic>	Map representation of the current ARPose object.

String toString

Converts the current ARPose object to a string.

Return Type

Type	Description
String	String representation of the current ARPose object.

ARHand

Contains the results of hand tracking, including the hand skeleton data and gesture recognition result. This class is derived from ARTrackableBase.

Public Properties

Click to expand/collapse table

Name	Type	Description
gestureType	int	Different static gestures can be identified based on whether deep flow inspection is enabled.
arHandType	ARHandType	The hand type, which can be left hand, right hand, or unknown (if left/right hand recognition is not supported).
gestureHandBox	List<double>	The rectangle that covers the hand, in the format of [x0,y0,0,x1,y1,0]. (x0,y0) indicates the upper left corner, (x1,y1) indicates the lower right corner, and x/y is based on the OpenGL NDC coordinate system.
gestureCenter	List<double>	Coordinates of the center point of a hand in the format of [x,y,0]. The point is the center coordinates of the bounding rectangle of the hand.
handSkeletonArray	List<double>	The coordinates of a hand skeleton point in the format of [x0,y0,z0,x1,y1,z1, ...].
handSkeletonConnection	List<int>	The connection data of a hand skeleton point, which is the index of the skeleton point type.
arHandSkeletonTypes	List<ARHandSkeletonType>	The list of hand skeleton point types.
gestureCoordinateSystem	ARCoordinateSystemType	Coordinate type used by the current gesture posture. For example,COORDINATE_SYSTEM_TYPE_2D_IMAGE indicates the OpenGL NDC coordinate.
skeletonCoordinateSystem	ARCoordinateSystemType	Coordinate system of the hand skeleton data: COORDINATE_SYSTEM_TYPE_2D_IMAGE indicates 2D hand tracking, and COORDINATE_SYSTEM_TYPE_3D_CAMERA indicates 3D hand tracking.
anchors	List<ARAnchor>	ARAnchor data attached to the current trackable object.
trackingState	TrackingState	Status of the current trackable.

Public Constants

enum ARHandType

The type of hand, which can be left or right.

Value	Description
AR_HAND_UNKNOWN	Unknown or the hand type cannot be distinguished.
AR_HAND_RIGHT	Right hand.
AR_HAND_LEFT	Left hand.

enum ARHandSkeletonType

The enum type of the hand skeleton point.

Click to expand/collapse table

Value	Description
HANDSKELETON_ROOT	The root point of the hand bone, that is, the wrist.
HANDSKELETON_PINKY_1	Pinky knuckle 1.
HANDSKELETON_PINKY_2	Pinky knuckle 2.
HANDSKELETON_PINKY_3	Pinky knuckle 3.
HANDSKELETON_PINKY_4	Pinky knuckle tip.
HANDSKELETON_RING_1	Ring finger knuckle 1.
HANDSKELETON_RING_2	Ring finger knuckle 2.
HANDSKELETON_RING_3	Ring finger knuckle 3.
HANDSKELETON_RING_4	Ring finger tip.
HANDSKELETON_MIDDLE_1	Middle finger knuckle 1.
HANDSKELETON_MIDDLE_2	Middle finger knuckle 2.
HANDSKELETON_MIDDLE_3	Middle finger knuckle 3.
HANDSKELETON_MIDDLE_4	Middle finger tip.
HANDSKELETON_INDEX_1	Index finger knuckle 1.
HANDSKELETON_INDEX_2	Index finger knuckle 2.
HANDSKELETON_INDEX_3	Index finger knuckle 3.
HANDSKELETON_INDEX_4	Index finger tip.
HANDSKELETON_THUMB_1	Thumb knuckle 1.
HANDSKELETON_THUMB_2	Thumb knuckle 2.
HANDSKELETON_THUMB_3	Thumb knuckle 3.
HANDSKELETON_THUMB_4	Thumb tip.
HANDSKELETON_LENGTH	Number of knuckles.

Public Method Summary

Name	Return Type	Description
toMap	Map<String, dynamic>	Returns the map representation of the current ARHand object.
toString	String	Returns the string representation of the current ARHand object.

Public Methods

Map<String, dynamic> toMap

Converts the current ARHand object to a Map.

Return Type

Type	Description
Map<String, dynamic>	Map representation of the current ARHand object.

String toString

Converts the current ARHand object to a string.

Return Type

Type	Description
String	String representation of the current ARHand object.

Gesture Type Mapping

With Huawei AR Engine different hand gestures can be identified based on whether deep flow inspection is enabled.

Gesture recognition is associated with deep flow inspection as shown on the table below.

Gesture Type	Value	Supported Without Deep Flow	Supported With Deep Flow
Gesture 0 (fist)	0	Yes	Yes
Gesture 1 (stick index finger)	1	Yes	No
Gesture 6 (calling gesture)	6	Yes	Yes
Gesture 8 (stick thumb and index finger apart)	8	No	Yes
Others	-1	--	--

The following figures show the gestures.

Gesture 0	Gesture 1	Gesture 6	Gesture 8

ARFace

Provides the face tracking results, including the face location, pose, and blend shapes. This class is derived from ARTrackableBase.

Public Properties

Name	Type	Description
arPose	ARPose	The pose of a face mesh center in the camera coordinate system, which is a right-handed coordinate system. The origin is located at the nose tip, the center of a face, X+ points leftwards, Y+ points up, and Z+ points from the inside to the outside with the face as the reference.
faceBlendShapes	ARFaceBlendShapes	The facial blend shapes, which contain several expression parameters.
anchors	List<ARAnchor>	ARAnchor data attached to the current trackable object.
trackingState	TrackingState	Status of the current trackable.

Public Method Summary

Name	Return Type	Description
toMap	Map<String, dynamic>	Returns the map representation of the current ARFace object.
toString	String	Returns the string representation of the current ARFace object.

Public Methods

Map<String, dynamic> toMap

Converts the current ARFace object to a Map.

Return Type

Type	Description
Map<String, dynamic>	Map representation of the current ARFace object.

String toString

Converts the current ARFace object to a string.

Return Type

Type	Description
String	String representation of the current ARFace Object.

ARFaceBlendShapes

Describes the facial blend shapes, which contain several expression parameters.

Public Properties

Name	Type	Description
blendShapeDataMap	Map<String, dynamic>	Key indicates the string corresponding to the blend shape enumeration type, and the value indicates the blend shape expression degree, ranging from [0, 1].
blendShapeData	List<double>	The value ranges from 0 to 1, indicating the expression degree of each blend shape.
blendShapeType	List<String>	List of blend shape types.
blendShapeCount	int	Number of blend shapes.

Public Method Summary

Name	Return Type	Description
toMap	Map<String, dynamic>	Returns the map representation of the current ARFaceBlendShapes object.

Public Methods

Map<String, dynamic> toMap

Converts the current ARFaceBlendShapes object to a Map.

Return Type

Type	Description
Map<String, dynamic>	Map representation of the current ARFaceBlendShapes object.

ARBody

The tracking result during body skeleton tracking, including body skeleton data, which is derived from ARTrackableBase.

Public Constants

enum ARBodySkeletonType

Enum which represents the body skeleton type.

Click to expand/collapse table

Value	Description
BodySkeleton_Unknown	Unknown skeleton type
BodySkeleton_Head	Head.
BodySkeleton_Neck	Neck.
BodySkeleton_r_Sho	Right shoulder.
BodySkeleton_r_Elbow	Right elbow.
BodySkeleton_r_Wrist	Right wrist.
BodySkeleton_l_Sho	Left shoulder.
BodySkeleton_l_Elbow	Left elbow.
BodySkeleton_l_Wrist	Left wrist.
BodySkeleton_r_Hip	Right hip joint.
BodySkeleton_r_Knee	Right knee.
BodySkeleton_r_Ankle	Right ankle.
BodySkeleton_l_Hip	Left hip joint.
BodySkeleton_l_Knee	Left knee.
BodySkeleton_l_Ankle	Left ankle.
BodySkeleton_Hip_mid	Center of hip joint.
BodySkeleton_r_ear	Right ear.
BodySkeleton_r_eye	Right eye.
BodySkeleton_nose	Nose.
BodySkeleton_l_eye	Left eye.
BodySkeleton_l_ear	Left ear.
BodySkeleton_spine	Spine.
BodySkeleton_r_toe	Right toe.
BodySkeleton_l_toe	Left toe.
BodySkeleton_Length	Number of joints, instead of a joint point.

Public Properties

Click to expand/collapse table

Name	Type	Description
bodyAction	int	Body action type, including six preset static postures.
bodySkeletonTypes	List<ARBodySkeletonType>	An array of body skeleton types, including the head, neck, left shoulder, and right shoulder.
skeletonPoint2D	List<double>	The 2D coordinates of a skeleton point measured with the screen center as the origin, in the format of [x0,y0,0,x1,y1,0]. The coordinates are normalized device coordinates (NDC) of OpenGL, and the value range of x/y is [-1,1].
skeletonPoint3D	List<double>	The 3D coordinates of a skeleton point, in the format of [x0,y0,z0,x1,y1,z1...].
skeletonConfidence	List<double>	The confidence of each skeleton point. The number of values are the same as that of skeleton points, and each element indicates the confidence within the range [0,1].
bodySkeletonConnection	List<int>	The connection data of a skeleton point, which is the index of the skeleton point type.
skeletonPointIsExist2D	List<bool>	True or False to indicate that whether the 2D coordinates of a skeleton point are valid. The value false indicates that the data is invalid, while true indicates that the data is valid.
skeletonPointIsExist3D	List<bool>	True or False to indicate that whether the 3D coordinates of a skeleton point are valid. The value false indicates that the data is invalid, while true indicates that the data is valid.
coordinateSystemType	ARCoordinateSystemType	The coordinate system type.
anchors	List<ARAnchor>	ARAnchor data attached to the current trackable object.
trackingState	TrackingState	Status of the current trackable.

Public Method Summary

Name	Return Type	Description
toMap	Map<String, dynamic>	Returns the map representation of the current ARBody object.
toString	String	Returns the string representation of the current ARBody object.

Public Methods

Map<String, dynamic> toMap

Converts the current ARBody object to a Map.

Return Type

Type	Description
Map<String, dynamic>	Map representation of the current ARBody object.

String toString

Converts the current ARBody object to a string.

Return Type

Type	Description
String	String representation of the current ARBody object.

Body Action Mapping

Huawei AR Engine can recognize different body actions. When a body action is recognized by the AR Engine SDK, the corresponding integer value will be returned through the bodyAction field. The table below shows the mapping of different body actions that can be recognized by the AR Engine.

Return value: 1	Return value: 2	Return value: 3
Return value: 4	Return value: 5	Return value: 6

ARPlane

Represents the plane information in the real world identified by HUAWEI AR Engine. This class is derived from ARTrackableBase.

Public Constants

enum SemanticPlaneLabel

Semantic types of the current plane.

Value	Description
PLANE_OTHER	Others.
PLANE_WALL	Wall.
PLANE_FLOOR	Floor.
PLANE_SEAT	Seat.
PLANE_TABLE	Table.
PLANE_CEILING	Ceiling.

enum PlaneType

The plane type.

Value	Description
HORIZONTAL_UPWARD_FACING	A horizontal plane facing up (such as the ground and desk platform).
HORIZONTAL_DOWNWARD_FACING	A horizontal plane facing down (such as the ceiling).
VERTICAL_FACING	A vertical plane.
UNKNOWN_FACING	Unsupported type.

Public Properties

Click to expand/collapse table

Name	Type	Description
centerPose	ARPose	The pose transformed from the local coordinate system of a plane to the world coordinate system.
extentX	double	The length of the plane's bounding rectangle measured along the local X-axis of the coordinate system centered on the plane, such as the width of the rectangle.
extentZ	double	The length of the plane's bounding rectangle measured along the local Z-axis of the coordinate system centered on the plane, such as the height of the rectangle.
planePolygon	List<double>	The 2D vertices of the detected plane, in the format of [x1, z1, x2, z2, ...].
label	SemanticPlaneLabel	The semantic type of the current plane, such as desktop or floor.
type	PlaneType	The plane type.
anchors	List<ARAnchor>	ARAnchor data attached to the current trackable object.
trackingState	TrackingState	Status of the current trackable.

Public Method Summary

Name	Return Type	Description
toMap	Map<String, dynamic>	Returns the map representation of the current ARPlane object.
toString	String	Returns the string representation of the current ARPlane object.

Public Methods

Map<String, dynamic> toMap

Converts the current ARPlane object to a Map.

Return Type

Type	Description
Map<String, dynamic>	Map representation of the current ARPlane object.

String toString

Converts the current ARPlane object to a string.

Return Type

Type	Description
String	String representation of the current ARPlane object.

Global Public Constants

enum ARCoordinateSystemType

The coordinate system type.

Value	Description
COORDINATE_SYSTEM_TYPE_UNKNOWN	Unknown coordinate system.
COORDINATE_SYSTEM_TYPE_3D_WORLD	World coordinate system
COORDINATE_SYSTEM_TYPE_3D_SELF	Local coordinate system.
COORDINATE_SYSTEM_TYPE_2D_IMAGE	OpenGL NDC coordinate system.
COORDINATE_SYSTEM_TYPE_3D_CAMERA	Camera coordinate system.

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4. Configuration and Description

No configuration needed.

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5. Sample Project

This plugin includes a demo project in the example folder, there you can find more usage examples.

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6. Questions or Issues

If you have questions about how to use HMS samples, try the following options:

• Stack Overflow is the best place for any programming questions. Be sure to tag your question with huawei-mobile-services.
• Github is the official repository for these plugins, You can open an issue or submit your ideas.
• Huawei Developer Forum HMS Core Module is great for general questions, or seeking recommendations and opinions.
• Huawei Developer Docs is place to official documentation for all HMS Core Kits, you can find detailed documentations in there.

If you run into a bug in our samples, please submit an issue to the GitHub repository.

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7. Licensing and Terms

Huawei AR Kit Flutter Plugin is licensed under Apache 2.0 license