1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
#!/usr/bin/env node
const Device = require("./lib/device");
const Motion = require("./lib/motion");
//const clone = x => JSON.parse(JSON.stringify(x)); // Deep
//const clone = x => Object.assign({}, x); // Shallow
const path = "/dev/input/"+process.argv[2];
console.log("Opening %s", path);
const device = new Device(path);
const motion = new Motion(device, 600/*ms for long*/);
device.on("open", () => { console.log(device.id); device.grab(); });
//device.on("EV_ABS", e => console.log(e));
//device.on("EV_SYN", e => console.log(e));
motion.on("error", console.error)
//.on("short", e => console.log("short", e))
//.on("long", e => console.log("long", e))
.on("short", doShort).on("long", doLong);
const flipBits = (n,w) => parseInt(n.toString(2).padStart(w,0).split("").reverse().join(""),2);
const eucDist = (a,b) => Math.sqrt((a.x-b.x)**2 + (a.y-b.y)**2);
//const avgDist = (a,b) => (eucDist(a.i,b.i) + eucDist(a.f,b.f))/2;
const selfDist = a => eucDist(a.i, a.f);
const getAngle2 = (a,b) => Math.atan2(a.y-b.y, b.x-a.x)*180/Math.PI;
const getAngle = a => getAngle2(a.i,a.f);
const isLeft = (a,b,c) => ((b.x-a.x)*(c.y-a.y) - (b.y-a.y)*(c.x-a.x))>0; // What side of a-b is c on
const state = {
homed: false,
homes: [],
angle: 0,
fingerDist: 0,
};
const dotRadius = 0.3; // Tap/reach boundary in terms of between-finger distance
const swipeLength = 0.2; // Tap/swipe threshold in terms of between-finger distance
function doLong(e) {
if (e.length < 3) return; // Pinky finger optional!
const between = [];
for (let i=0;i<e.length;i++)
for (let j=i+1;j<e.length;j++)
between.push({a:i, b:j, dist:eucDist(e[i].m, e[j].m)});
between.sort((a,b) => a.dist-b.dist);
const fingerDist = between[0].dist;
if (e.map(p => selfDist(p)).reduce((a,d) =>
a || (d >= fingerDist*swipeLength), false)) return; // Moved too far
const biggest = between.pop();
const sides = e.reduce((a,p,i) => {
if (i != biggest.a && i != biggest.b)
a.push({i:i,s:isLeft(e[biggest.a].m, e[biggest.b].m, p.m)});
return a; }, []);
const side = 2*sides.reduce((a,s)=>a+s.s,0)>sides.length;
const indexFinger = biggest[side?"b":"a"];
state.homes = [];
state.homes.push(e[indexFinger].m);
sides.map(f => Object.assign({d:eucDist(e[indexFinger].m, e[f.i].m)}, f))
.sort((a,b) => a.d-b.d).forEach(f => state.homes.push(e[f.i].m));
state.homes.push(e[biggest[side?"a":"b"]].m);
state.angle = getAngle2(state.homes[0], state.homes[state.homes.length-1]);
state.fingerDist = fingerDist;
state.homed = true;
//console.log(JSON.stringify(state.homes), state.angle, state.fingerDist);
console.log("Homed");
}
const prettyFingers = n => "("+n.toString(2).padStart(state.homes.length,0)
.split("").map(f => f=="1"?"#":" ").reverse().join("")+")";
function doShort(e) {
if (!state.homed) return;
// Gesture types:
// - Tap:
// - inside tap | 0
// - reaching tap | 1
// - Swipe:
// - Vertical:
// - from in down | 2
// - from up in | 3
// - swipe up | 4
// - Horizontal:
// - from in left | 5
// - from in right | 6
const isTap = (e.reduce((a,p) => a+selfDist(p),0) /
e.length) < state.fingerDist * swipeLength;
if (isTap) {
const fingers = e.map(p => state.homes
.map((f,i) => ({i,d:eucDist(f, p.m)}))
.sort((a,b)=>a.d-b.d)[0]);
const fingerCode = fingers.reduce((a,f) => a+2**f.i, 0);
// TODO reaching taps
console.log("tap", prettyFingers(fingerCode));
} else { // TODO swipes
console.log("swipe");
}
}
|
