我们正在构建一个React-Redux Web应用程序,它将显示多个三个JS场景。这些场景成对出现,每对都将同步缩放。为方便起见,我们将相机数据存储在Redux商店中。
这是我们的React类(深呼吸,对于一个SO问题有点长),它使用react-three-renderer来生成三个JS对象:
import React, { Component } from 'react';
import { connect } from 'react-redux';
import { Vector3 } from 'three';
import React3 from 'react-three-renderer';
import ReferenceGrid from './ReferenceGridVisual';
import ResourceGroup from './resourceGroups/ResourceGroup';
import { initializeRayCastScene } from './viewportMath/RayCastScene';
import zoomCamera from './viewportMath/CameraZoom';
import { registerCamera, zoom } from './actions/cameraActions';
import { InitThreeJsDomEvents, UpdateDomCamera } from './domUtility/ThreeJSDom';
class ThreeJsScene extends Component {
constructor(props) {
super(props);
this.ZoomAmount = 150;
this.ZoomMaxCap = 1000;
this.ZoomMinCap = 6;
this.zoomPadding = 10;
this.minimumZoom = 45;
}
componentWillMount() {
initializeRayCastScene();
this.props.registerCamera(this.props.sceneName);
}
componentDidMount() {
// eslint-disable-next-line no-underscore-dangle
InitThreeJsDomEvents(this.camera, this.canvas._canvas);
}
onWheel = (event) => {
// eslint-disable-next-line
this.zoom(event.clientX, event.clientY, event.deltaY);
}
setCameraRef = (camera) => {
UpdateDomCamera(camera);
this.camera = camera;
}
zoom(screenPosX, screenPosY, zoomAmount) {
const size = {
width: this.props.width,
height: this.props.height,
};
const result = zoomCamera(screenPosX, screenPosY, zoomAmount, this.camera.position,
size, this.props.distance, this.camera, this.props.cameraType, this.ZoomMaxCap,
this.ZoomMinCap);
this.ZoomAmount = (result.ZoomAmount) ? result.ZoomAmount : this.ZoomAmount;
this.props.zoom(this.props.sceneName, result.distanceChangeFactor, result.newCameraPosition);
}
render() {
let position;
if (this.props.cameraPosition != null) {
position = new Vector3(
this.props.cameraPosition.x,
this.props.cameraPosition.y,
this.props.cameraPosition.z
);
} else {
position = new Vector3();
}
const left = -this.props.width / 2;
const right = this.props.width / 2;
const top = this.props.height / 2;
const bottom = -this.props.height / 2;
return (
<div
style={{ lineHeight: '0' }}
onWheel={this.onWheel}
>
<React3
width={this.props.width}
height={this.props.height}
mainCamera="camera"
antialias
pixelRatio={1}
ref={(canvas) => { this.canvas = canvas; }}
>
<scene ref={(scene) => { this.scene = scene; }}>
<orthographicCamera
name="camera"
left={left}
right={right}
top={top}
bottom={bottom}
near={0.01}
far={1400}
position={position}
ref={this.setCameraRef}
/>
<ambientLight
color={0xaaaaaa}
/>
<directionalLight
color={0xaaaaaa}
intensity={1.1}
position={new Vector3(3, 4, 10)}
lookAt={new Vector3(0, 0, 0)}
/>
<ReferenceGrid xActive yActive zActive={false} store={this.props.store} />
<ResourceGroup store={this.props.store}>
{this.props.children}
</ResourceGroup>
</scene>
</React3>
</div>
);
}
}
const mapStateToProps = (state, ownProps) => {
const ownCamera = state.cameras.get(ownProps.sceneName);
if (ownCamera == null) {
console.log('own camera null');
return { cameraAvailable: false };
}
console.log('has own camera');
const cameraPosition = ownCamera.position;
const cameraType = ownCamera.type;
const distance = ownCamera.distance;
return {
cameraAvailable: true,
cameraPosition,
cameraType,
distance,
};
};
const mapDispatchToProps = dispatch => ({
registerCamera: (cameraName) => {
dispatch(registerCamera(cameraName));
},
zoom: (cameraName, factor, newCameraPosition) => {
dispatch(zoom(cameraName, factor, newCameraPosition));
},
});
export default connect(mapStateToProps, mapDispatchToProps)(ThreeJsScene);
此外,作为参考,以下是动作创建者:
export const registerCamera = cameraName => (dispatch) => {
dispatch({ type: 'REGISTER_CAMERA', newCameraName: cameraName });
};
export const zoom = (cameraName, factor, newCameraPosition) => (dispatch, getState) => {
const state = getState();
const zoomFactor = state.cameras.get(cameraName).distance * (1 - factor);
dispatch({ type: 'CAMERA_ZOOM', cameraName, factor: zoomFactor, newCameraPosition });
};
还原剂:
import { Map } from 'immutable';
const defaultCameraProperties = {
distance: 150,
type: 'orthogonal',
position: { x: 0, y: 10, z: 50 },
rotation: { x: 0, y: 0, z: 0, w: 1 },
};
const initialState = Map();
export default (state = initialState, action) => {
switch (action.type) {
case 'REGISTER_CAMERA': {
const newCamera = {
...defaultCameraProperties,
...action.newCameraProperties,
};
return state.set(action.newCameraName, newCamera);
}
case 'CAMERA_ZOOM': {
const updatedDistance = action.factor;
const updatedCameraPosition = {
...state.get(action.cameraName).position,
...action.newCameraPosition,
};
const updatedCamera = {
...state.get(action.cameraName),
position: updatedCameraPosition,
distance: updatedDistance,
};
return state.set(action.cameraName, updatedCamera);
}
default: {
return state;
}
}
};
挑战在React类的zoom
函数中,React props
不是我所期望的,因此缩放失败。以下是我理解的相关事件序列的摘要:
componentWillMount
,调度REGISTER_CAMERA
方法。 (我们这样做而不是在商店中默认拥有相机数据,因为这些场景是动态生成的 - 它们没有静态数量。)render
方法。render
方法,因为REGISTER_CAMERA
操作现在已经修改了商店,我们有了新道具 - 相机相关道具现在可用。onWheel
处理程序调用{{1}}函数,但该方法中的断点显示相机相关道具(如zoom
- 是this.props.cameraType
。 React道具显示在2中。(undefined
进行一些计算。由于这些属性不可用,缩放失败。)我无法弄清楚为什么会这样。我的怀疑是我误解了zoomCamera
上下文绑定到缩放方法的内容。
简而言之,我的问题是为什么我的this
不是最新版本,如何才能将更新版本提供给props
函数?
答案 0 :(得分:0)
原来这是热模块重新加载的错误。运行我们的构建冷却不会出现问题。