From e97ee92acc19b30c8e3c044049ea5951d8c45d63 Mon Sep 17 00:00:00 2001
From: Adam Hovorka <adamhovorka@gmail.com>
Date: Tue, 21 Jul 2020 21:49:37 -0600
Subject: Chunk events into discrete sets of start/end points

---
 lib/device.js |  87 ++++++++++++++++++++++++++++++++++++++++++++++++++
 lib/index.js  |  87 --------------------------------------------------
 lib/motion.js | 100 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 187 insertions(+), 87 deletions(-)
 create mode 100644 lib/device.js
 delete mode 100644 lib/index.js
 create mode 100644 lib/motion.js

(limited to 'lib')

diff --git a/lib/device.js b/lib/device.js
new file mode 100644
index 0000000..a9fb71d
--- /dev/null
+++ b/lib/device.js
@@ -0,0 +1,87 @@
+const fs = require("fs")
+    , util = require("util")
+    , EventEmitter = require("events").EventEmitter
+    , {eviocgrab, eviocgid} = require("bindings")("ioctl.node")
+    , events = require("./events");
+
+const arch = (process.arch.indexOf("64")>=0)?64:32;
+
+function Device(path) {
+  this.grabbed = false;
+  if (path) this.open(path);
+}
+
+util.inherits(Device, EventEmitter);
+
+Device.prototype.open = function(path) {
+  this.stream = fs
+    .createReadStream(path, {flags: "r", autoClose: true})
+    .on("error", e => this.emit("error", e))
+    .on("open", fd => { this.fd = fd;
+      try { this.id = eviocgid(fd); }
+      catch(e) { this.emit("error",
+        new Error("Reader eviocgid error:"+e)); }
+      if (this.grabbed) eviocgrab(this.fd, 1);
+      this.emit("open", fd); })
+    .on("data", buf => {
+      var i, j, chunk = (arch===64)?24:16;
+      for (i=0, j=buf.length; i<j; i+=chunk) {
+        const e = parse(buf.slice(i, i+chunk));
+        this.emit("event", e);
+        this.emit(e.type, e);
+      }});
+};
+
+Device.prototype.close = function() {
+  this.grabbed = false;
+  this.stream.close();
+  delete this.stream;
+  delete this.fd;
+  delete this.id;
+};
+
+Device.prototype.grab = function() {
+  if (this.grabbed) return; this.grabbed = true;
+  if (this.fd) eviocgrab(this.fd, 1);
+};
+
+Device.prototype.ungrab = function() {
+  if (!this.grabbed) return; this.grabbed = false;
+  if (this.fd) eviocgrab(this.fd, 0);
+};
+
+// struct input_event {
+//   struct timeval {
+//     long tv_sec;  // s32/64 (arch)
+//     long tv_usec; // LE (always?)
+//   } time;
+//   __u16 type;
+//   __u16 code;
+//   __s32 value;
+// };
+function parse(buf) {
+  var e = {time: {sec: null, usec: null},
+    type: null, code: null, value: null};
+
+  var offset;
+  if (arch === 64) { offset = 16;
+    e.time.sec  = buf.readBigInt64LE(0);
+    e.time.usec = buf.readBigInt64LE(8);
+  } else { offset = 8;
+    e.time.sec  = buf.readInt32LE(0);
+    e.time.usec = buf.readInt32LE(4);
+  }
+
+  e.type = buf.readUInt16LE(offset);
+  e.code = buf.readUInt16LE(offset + 2);
+  e.value = buf.readInt32LE(offset + 4);
+
+  if (events.types[e.type])
+    e.type = events.types[e.type];
+  if (events[e.type] && events[e.type][e.code])
+    e.code = events[e.type][e.code];
+
+  return e;
+};
+
+module.exports = Device;
diff --git a/lib/index.js b/lib/index.js
deleted file mode 100644
index a9fb71d..0000000
--- a/lib/index.js
+++ /dev/null
@@ -1,87 +0,0 @@
-const fs = require("fs")
-    , util = require("util")
-    , EventEmitter = require("events").EventEmitter
-    , {eviocgrab, eviocgid} = require("bindings")("ioctl.node")
-    , events = require("./events");
-
-const arch = (process.arch.indexOf("64")>=0)?64:32;
-
-function Device(path) {
-  this.grabbed = false;
-  if (path) this.open(path);
-}
-
-util.inherits(Device, EventEmitter);
-
-Device.prototype.open = function(path) {
-  this.stream = fs
-    .createReadStream(path, {flags: "r", autoClose: true})
-    .on("error", e => this.emit("error", e))
-    .on("open", fd => { this.fd = fd;
-      try { this.id = eviocgid(fd); }
-      catch(e) { this.emit("error",
-        new Error("Reader eviocgid error:"+e)); }
-      if (this.grabbed) eviocgrab(this.fd, 1);
-      this.emit("open", fd); })
-    .on("data", buf => {
-      var i, j, chunk = (arch===64)?24:16;
-      for (i=0, j=buf.length; i<j; i+=chunk) {
-        const e = parse(buf.slice(i, i+chunk));
-        this.emit("event", e);
-        this.emit(e.type, e);
-      }});
-};
-
-Device.prototype.close = function() {
-  this.grabbed = false;
-  this.stream.close();
-  delete this.stream;
-  delete this.fd;
-  delete this.id;
-};
-
-Device.prototype.grab = function() {
-  if (this.grabbed) return; this.grabbed = true;
-  if (this.fd) eviocgrab(this.fd, 1);
-};
-
-Device.prototype.ungrab = function() {
-  if (!this.grabbed) return; this.grabbed = false;
-  if (this.fd) eviocgrab(this.fd, 0);
-};
-
-// struct input_event {
-//   struct timeval {
-//     long tv_sec;  // s32/64 (arch)
-//     long tv_usec; // LE (always?)
-//   } time;
-//   __u16 type;
-//   __u16 code;
-//   __s32 value;
-// };
-function parse(buf) {
-  var e = {time: {sec: null, usec: null},
-    type: null, code: null, value: null};
-
-  var offset;
-  if (arch === 64) { offset = 16;
-    e.time.sec  = buf.readBigInt64LE(0);
-    e.time.usec = buf.readBigInt64LE(8);
-  } else { offset = 8;
-    e.time.sec  = buf.readInt32LE(0);
-    e.time.usec = buf.readInt32LE(4);
-  }
-
-  e.type = buf.readUInt16LE(offset);
-  e.code = buf.readUInt16LE(offset + 2);
-  e.value = buf.readInt32LE(offset + 4);
-
-  if (events.types[e.type])
-    e.type = events.types[e.type];
-  if (events[e.type] && events[e.type][e.code])
-    e.code = events[e.type][e.code];
-
-  return e;
-};
-
-module.exports = Device;
diff --git a/lib/motion.js b/lib/motion.js
new file mode 100644
index 0000000..781d54b
--- /dev/null
+++ b/lib/motion.js
@@ -0,0 +1,100 @@
+const util = require("util")
+    , EventEmitter = require("events").EventEmitter;
+
+const longTime = 600;
+
+//const clone = x => JSON.parse(JSON.stringify(x)); // Deep
+const clone = x => Object.assign({}, x); // Shallow
+const slotToPoint = s => ({xi:s.xi, yi:s.yi, xf:s.x, yf:s.y});
+
+function Motion(device) {
+  this.device = device;
+  this.slotsUsed = 0;
+  this.slots = [];
+  this.points = [];
+  this.longed = false;
+
+  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) return;
+    if (e.value >= 0) {
+      this.currentSlot.id = e.value;
+      if (this.slotsUsed++ === 0) {
+        //this.start = e.time;
+        this.longTimeout = setTimeout(() =>
+          this.emitLong(), 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.slotsUsed === 0) {
+        //this.end = e.time;
+        clearTimeout(this.longTimeout);
+      }
+    } break;
+
+  case "ABS_MT_POSITION_X":
+    if (!this.currentSlot) return;
+    if (this.currentSlot.id < 0) return;
+    this.currentSlot.x = e.value;
+    if (this.currentSlot.xi < 0)
+      this.currentSlot.xi = e.value;
+    break;
+
+  case "ABS_MT_POSITION_Y":
+    if (!this.currentSlot) return;
+    if (this.currentSlot.id < 0) return;
+    this.currentSlot.y = e.value;
+    if (this.currentSlot.yi < 0)
+      this.currentSlot.yi = e.value;
+    break;
+
+  //default:
+  //  console.log(e.code, e.value);
+}};
+
+Motion.prototype.doSYN = function(e) {
+  if (e.code === "SYN_REPORT" && this.slotsUsed === 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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