Neale Pickett
·
2024-01-04
gamepad.html
1<!--
2/*
3 * Copyright 2019 Gregg Tavares
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 */
23-->
24<style>
25body {
26 background: #444;
27 color: white;
28 font-family: monospace;
29}
30#gamepads>* {
31 background: #333;
32 padding: 1em;
33 margin: 10px 5px 0 0;
34}
35#gamepads pre {
36 white-space: pre-wrap;
37}
38
39.head {
40 display: flex;
41}
42.head .id {
43 flex: 1 1 auto;
44}
45.head .index,
46.head .id {
47 display: inline-block;
48 background: #222;
49 padding: 0.5em;
50}
51.head .index {
52}
53
54.info .label {
55 width: 7em;
56 display: inline-block;
57}
58.info>div {
59 padding: 0.25em;
60 background: #222;
61 margin: 0.25em 0.25em 0 0;
62}
63
64.inputs {
65 display: flex;
66}
67.axes {
68 display: flex;
69 align-items: flex-start;
70}
71
72.svg text {
73 color: #CCC;
74 font-family: monospace;
75}
76
77.axes svg text {
78 font-size: 0.6px;
79}
80.buttons svg text {
81 font-size: 1.2px;
82}
83.axes>div, .buttons>div {
84 display: inline-block;
85 background: #222;
86}
87.axes>div {
88 margin: 2px 5px 0 0;
89}
90.buttons>div {
91 margin: 2px 2px 0 0;
92}
93</style>
94<body>
95
96<h1>HTML5 Gamepad Test</h1>
97<div>running: <span id="running"></span></div>
98<div id="gamepads"></div>
99</body>
100<script>
101
102const fudgeFactor = 2; // because of bug in Chrome related to svg text alignment font sizes can not be < 1
103const runningElem = document.querySelector('#running');
104const gamepadsElem = document.querySelector('#gamepads');
105const gamepadsByIndex = {};
106
107const controllerTemplate = `
108<div>
109 <div class="head"><div class="index"></div><div class="id"></div></div>
110 <div class="info"><div class="label">connected:</div><span class="connected"></span></div>
111 <div class="info"><div class="label">mapping:</div><span class="mapping"></span></div>
112 <div class="inputs">
113 <div class="axes"></div>
114 <div class="buttons"></div>
115 </div>
116</div>
117`;
118const axisTemplate = `
119<svg viewBox="-2.2 -2.2 4.4 4.4" width="128" height="128">
120 <circle cx="0" cy="0" r="2" fill="none" stroke="#888" stroke-width="0.04" />
121 <path d="M0,-2L0,2M-2,0L2,0" stroke="#888" stroke-width="0.04" />
122 <circle cx="0" cy="0" r="0.22" fill="red" class="axis" />
123 <text text-anchor="middle" fill="#CCC" x="0" y="2">0</text>
124</svg>
125`
126
127const buttonTemplate = `
128<svg viewBox="-2.2 -2.2 4.4 4.4" width="64" height="64">
129 <circle cx="0" cy="0" r="2" fill="none" stroke="#888" stroke-width="0.1" />
130 <circle cx="0" cy="0" r="0" fill="none" fill="red" class="button" />
131 <text class="value" dominant-baseline="middle" text-anchor="middle" fill="#CCC" x="0" y="0">0.00</text>
132 <text class="index" alignment-baseline="hanging" dominant-baseline="hanging" text-anchor="start" fill="#CCC" x="-2" y="-2">0</text>
133</svg>
134`;
135
136function addGamepad(gamepad) {
137 console.log('add:', gamepad.index);
138 const elem = document.createElement('div');
139 elem.innerHTML = controllerTemplate;
140
141 const axesElem = elem.querySelector('.axes');
142 const buttonsElem = elem.querySelector('.buttons');
143
144 const axes = [];
145 for (let ndx = 0; ndx < gamepad.axes.length; ndx += 2) {
146 const div = document.createElement('div');
147 div.innerHTML = axisTemplate;
148 axesElem.appendChild(div);
149 axes.push({
150 axis: div.querySelector('.axis'),
151 value: div.querySelector('text'),
152 });
153 }
154
155 const buttons = [];
156 for (let ndx = 0; ndx < gamepad.buttons.length; ++ndx) {
157 const div = document.createElement('div');
158 div.innerHTML = buttonTemplate;
159 buttonsElem.appendChild(div);
160 div.querySelector('.index').textContent = ndx;
161 buttons.push({
162 circle: div.querySelector('.button'),
163 value: div.querySelector('.value'),
164 });
165 }
166
167 gamepadsByIndex[gamepad.index] = {
168 gamepad,
169 elem,
170 axes,
171 buttons,
172 index: elem.querySelector('.index'),
173 id: elem.querySelector('.id'),
174 mapping: elem.querySelector('.mapping'),
175 connected: elem.querySelector('.connected'),
176 };
177 gamepadsElem.appendChild(elem);
178}
179
180function removeGamepad(gamepad) {
181 const info = gamepadsByIndex[gamepad.index];
182 if (info) {
183 delete gamepadsByIndex[gamepad.index];
184 info.elem.parentElement.removeChild(info.elem);
185 }
186}
187
188function addGamepadIfNew(gamepad) {
189 const info = gamepadsByIndex[gamepad.index];
190 if (!info) {
191 addGamepad(gamepad);
192 } else {
193 // This broke sometime in the past. It used to be
194 // the same gamepad object was returned forever.
195 // Then Chrome only changed to a new gamepad object
196 // is returned every frame.
197 info.gamepad = gamepad;
198 }
199}
200
201function handleConnect(e) {
202 console.log('connect');
203 addGamepadIfNew(e.gamepad);
204}
205
206function handleDisconnect(e) {
207 console.log('disconnect');
208 removeGamepad(e.gamepad);
209}
210
211const t = String.fromCharCode(0x26AA);
212const f = String.fromCharCode(0x26AB);
213function onOff(v) {
214 return v ? t : f;
215}
216
217const keys = ['index', 'id', 'connected', 'mapping', /*'timestamp'*/];
218function processController(info) {
219 const {elem, gamepad, axes, buttons} = info;
220 const lines = [`gamepad : ${gamepad.index}`];
221 for (const key of keys) {
222 info[key].textContent = gamepad[key];
223 }
224 axes.forEach(({axis, value}, ndx) => {
225 const off = ndx * 2;
226 axis.setAttributeNS(null, 'cx', gamepad.axes[off ] * fudgeFactor);
227 axis.setAttributeNS(null, 'cy', gamepad.axes[off + 1] * fudgeFactor);
228 value.textContent = `${Math.floor(127*gamepad.axes[off]+127)},${Math.floor(127*gamepad.axes[off+1]+127)}`;
229 });
230 buttons.forEach(({circle, value}, ndx) => {
231 const button = gamepad.buttons[ndx];
232 circle.setAttributeNS(null, 'r', button.value * fudgeFactor);
233 circle.setAttributeNS(null, 'fill', button.pressed ? 'red' : 'gray');
234 value.textContent = `${button.value.toFixed(2)}`;
235 });
236
237// lines.push(`axes : [${gamepad.axes.map((v, ndx) => `${ndx}: ${v.toFixed(2).padStart(5)}`).join(', ')} ]`);
238// lines.push(`buttons : [${gamepad.buttons.map((v, ndx) => `${ndx}: ${onOff(v.pressed)} ${v.value.toFixed(2)}`).join(', ')} ]`);
239 // elem.textContent = lines.join('\n');
240}
241
242function addNewPads() {
243 const gamepads = navigator.getGamepads();
244 for (let i = 0; i < gamepads.length; i++) {
245 const gamepad = gamepads[i]
246 if (gamepad) {
247 addGamepadIfNew(gamepad);
248 }
249 }
250}
251
252window.addEventListener("gamepadconnected", handleConnect);
253window.addEventListener("gamepaddisconnected", handleDisconnect);
254
255function process() {
256 runningElem.textContent = ((performance.now() * 0.001 * 60 | 0) % 100).toString().padStart(2, '0');
257 addNewPads(); // some browsers add by polling, others by event
258
259 Object.values(gamepadsByIndex).forEach(processController);
260 requestAnimationFrame(process);
261}
262requestAnimationFrame(process);
263
264</script>