Create react-app: web-interface with joystick
- Functional react project which currently provides a web-interface with a joystick element. - Coordinates, angle and radius are calculated and sent via http POST request to an API provided by the esp32 controller (websocket approach was dropped) - Currently the URL/IP is hardcoded in App.js and has to be changed depending on the IP-address of the esp32
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jonny_ji7
234
react-app/src/App.js
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234
react-app/src/App.js
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import { Joystick } from 'react-joystick-component';
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import React, { useState} from 'react';
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//import { w3cwebsocket as W3CWebSocket } from "websocket";
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function App() {
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//declare variables that can be used and updated in html
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const [angle_html, setAngle_html] = useState(0);
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const [x_html, setX_html] = useState(0);
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const [y_html, setY_html] = useState(0);
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const [radius_html, setRadius_html] = useState(0);
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//===============================
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//=========== config ============
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//===============================
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const decimalPlaces = 3;
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const joystickSize = 200; //affects scaling of coordinates and size of joystick on website
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const toleranceSnapToZeroPer = 20;//percentage of moveable range the joystick can be moved from the axix and value stays at 0
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//-------------------------------------------------
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//------- Scale coordinate, apply tolerance -------
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//-------------------------------------------------
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//function that:
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// - scales the coodinate to a range of -1 to 1
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// - snaps 0 zero for a given tolerance in percent
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// - rounds value do given decimal places
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// - TODO: add threshold it snaps to 1 / -1 (100%) toleranceEnd
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const ScaleCoordinate = (input) => {
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//calc tolerance threshold and available range
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const tolerance = joystickSize/2 * toleranceSnapToZeroPer/100;
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const range = joystickSize/2 - tolerance;
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let result = 0;
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console.log("value:",input,"tolerance:",tolerance," range:",range);
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//input positive and above 'snap to zero' threshold
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if ( input > 0 && input > tolerance ){
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result = ((input-tolerance)/range).toFixed(decimalPlaces);
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}
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//input negative and blow 'snap to zero' threshold
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else if ( input < 0 && input < -tolerance ){
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result = ((input+tolerance)/range).toFixed(decimalPlaces);
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}
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//inside threshold around zero
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else {
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result = 0;
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}
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//return result
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console.log("result:", result, "\n");
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return result;
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}
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//-------------------------------------------
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//------- Senda data via POST request -------
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//-------------------------------------------
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//function that sends an object as json to the esp32 with a http post request
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const httpSendObject = async (object_data) => {
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//debug log
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console.log("Sending:", object_data);
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let json = JSON.stringify(object_data);
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//console.log("json string:", json);
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//remove quotes around numbers:
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//so cJSON parses the values as actua[l numbers than strings
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const regex2 = /"(-?[0-9]+\.{0,1}[0-9]*)"/g
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json = json.replace(regex2, '$1')
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//console.log("json removed quotes:", json);
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//await fetch("http://10.0.1.69/api/joystick", {
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//await fetch("http://10.0.1.72/api/joystick", {
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await fetch("http://192.168.4.1/api/joystick", {
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method: "POST",
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//apparently browser sends OPTIONS request before actual POST request, this OPTIONS request was not handled by esp32
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//also the custom set Access-Control-Allow-Origin header in esp32 url header was not read because of that
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//changed content type to text/plain to workaround this
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//https://stackoverflow.com/questions/1256593/why-am-i-getting-an-options-request-instead-of-a-get-request
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headers: {
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//"Content-Type": "application/json",
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"Content-Type": "text/plain",
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},
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body: json,
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});
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};
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//---------------------------------------
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//--- function when joystick is moved ---
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//---------------------------------------
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//function that is run for each move event
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//evaluate coordinates and send to esp32
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const handleMove = (e) => {
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//console.log("data from joystick-element X:" + e.x + " Y:" + e.y + " distance:" + e.distance);
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//calculate needed variables
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const x = ScaleCoordinate(e.x);
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const y = ScaleCoordinate(e.y);
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const radius = (e.distance / 100).toFixed(5);
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const angle = ( Math.atan( y / x ) * 180 / Math.PI ).toFixed(2);
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//crate object with necessary data
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const joystick_data={
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x: x,
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y: y,
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radius: radius,
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angle: angle
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}
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//send object with joystick data as json to controller
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httpSendObject(joystick_data);
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//update variables for html
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setX_html(joystick_data.x);
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setY_html(joystick_data.y);
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setRadius_html(joystick_data.radius);
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setAngle_html(joystick_data.angle);
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};
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//------------------------------------------
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//--- function when joystick is released ---
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//------------------------------------------
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const handleStop = (e) => {
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//create object with all values 0
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const joystick_data={
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x: 0,
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y: 0,
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radius: 0,
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angle: 0
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}
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//update variables for html
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setX_html(0);
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setY_html(0);
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setRadius_html(0);
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setAngle_html(0);
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//send object with joystick data as json to controller
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httpSendObject(joystick_data);
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};
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//=============================
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//======== return html ========
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//=============================
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return (
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<>
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<div style={{display:'flex', justifyContent:'center', alignItems:'center', height:'100vh'}}>
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<div>
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<div style={{position: 'absolute', top: '0'}}>
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<h1>Joystick ctl</h1>
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</div>
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<Joystick
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size={joystickSize}
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sticky={false}
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baseColor="red"
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stickColor="blue"
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throttle={200}
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move={handleMove}
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stop={handleStop}
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>
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</Joystick>
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<ul>
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<li> x={x_html} </li>
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<li> y={y_html} </li>
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<li> radius={radius_html} </li>
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<li> angle={angle_html} </li>
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</ul>
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</div>
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</div>
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</>
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);
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}
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export default App;
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//del, testing, unused code
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//---------------------------------------------
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//--------- Send data via websocket -----------
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//---------------------------------------------
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//moved to normal POST request since websocket connection was unreliable on esp32
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// //create websocket
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// const websocket = useRef(null);
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// //const socketUrl = "ws://" + window.location.host + "/ws-api/servo";
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// const socketUrl = "ws://10.0.1.69/ws-api/joystick";
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// useEffect(() => {
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// websocket.current = new W3CWebSocket(socketUrl);
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// websocket.current.onmessage = (message) => {
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// console.log('got reply! ', message);
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// };
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// websocket.current.onopen = (event) => {
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// console.log('OPENED WEBSOCKET', event);
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// //sendJoystickData(0, 0, 0, 0);
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// websocket.current.send("");
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// };
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// websocket.current.onclose = (event) => {
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// console.log('CLOSED WEBSOCKET', event);
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// };
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// return () => websocket.current.close();
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// }, [])
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//
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//
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//
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// //function for sending joystick data (provided as parameters) to controller via websocket
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// const sendJoystickDataWebsocket = (x, y, radius, angle) => {
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// //debug log
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// console.log("Sending:\n X:" + x + "\n Y:" + y + "\n radius:" + radius + "\n angle: " + angle);
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//
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// websocket.current.send(
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// JSON.stringify({
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// x: x,
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// y: y,
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// radius: radius,
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// angle: angle
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// })
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// );
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// }
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14
react-app/src/index.js
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14
react-app/src/index.js
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@@ -0,0 +1,14 @@
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import React from 'react';
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import ReactDOM from 'react-dom/client';
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import App from './App';
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const root = ReactDOM.createRoot(document.getElementById('root'));
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root.render(
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<React.StrictMode>
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<App />
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</React.StrictMode>
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);
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// If you want to start measuring performance in your app, pass a function
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// to log results (for example: reportWebVitals(console.log))
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// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
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