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const util = require("util")
, EventEmitter = require("events").EventEmitter;
//const slotToPoint = s => ({xi:s.xi, yi:s.yi, xf:s.x, yf:s.y});
const slotToPoint = s => ({
i:{x:s.xi, y:s.yi}, f:{x:s.x, y:s.y},
m:{x:(s.xi+s.x)/2, y:(s.yi+s.y)/2}
});
function Motion(device, longTime) {
this.device = device;
this.slotsActive = 0;
this.slots = [];
this.points = [];
this.longed = false;
this.longTime = longTime || 600;
device.on("EV_ABS", e => this.doABS(e));
device.on("EV_SYN", e => this.doSYN(e));
device.on("error", e => this.emit("error", "Device Error: "+e));
this.addSlot();
}
util.inherits(Motion, EventEmitter);
Motion.prototype.addSlot = function() {
this.slots.push({id: -1, xi: -1, yi: -1, x: 0, y: 0});
};
Motion.prototype.emitLong = function() {
this.slots.forEach(s => { if (s.id >= 0)
this.points.push(slotToPoint(s)); });
this.emit("long", this.points);
this.points = [];
this.longed = true;
};
Motion.prototype.doABS = function(e) {
switch (e.code) {
case "ABS_MT_SLOT":
for (let i=this.slots.length-1;
i<e.value; i++) this.addSlot();
this.currentSlot = this.slots[e.value];
break;
case "ABS_MT_TRACKING_ID":
if (this.currentSlot === undefined) {
this.addSlot();
this.currentSlot = this.slots[0];
}
if (e.value >= 0) {
this.currentSlot.id = e.value;
if (this.slotsActive++ === 0) {
this.longTimeout = setTimeout(() =>
this.emitLong(), this.longTime);
}
} else {
if (!this.longed && this.currentSlot.xi >= 0)
this.points.push(slotToPoint(this.currentSlot));
this.currentSlot.id = -1;
this.currentSlot.xi = -1;
this.currentSlot.yi = -1;
this.currentSlot.x = 0;
this.currentSlot.y = 0;
if (--this.slotsActive === 0) {
clearTimeout(this.longTimeout);
}
} break;
case "ABS_MT_POSITION_X":
if (this.currentSlot === undefined) return;
if (this.currentSlot.id < 0) return;
if (this.currentSlot.xi < 0)
this.currentSlot.xi = e.value;
this.currentSlot.x = e.value;
break;
case "ABS_MT_POSITION_Y":
if (this.currentSlot === undefined) return;
if (this.currentSlot.id < 0) return;
if (this.currentSlot.yi < 0)
this.currentSlot.yi = e.value;
this.currentSlot.y = e.value;
break;
//default:
// console.log(e.code, e.value);
}};
Motion.prototype.doSYN = function(e) {
if (e.code === "SYN_REPORT") {
//console.log("SYN", this.slotsActive, this.points.length);
if (this.slotsActive <= 0) {
this.slotsActive = 0;
if (this.longed) { this.longed = false;
} else if (this.points.length > 0) {
this.emit("short", this.points);
this.points = [];
}
}
}
};
module.exports = Motion;
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