From ee132284861f1084046086b7ae11d56623df7834 Mon Sep 17 00:00:00 2001
From: Snipeye <Snipeye@gmail.com>
Date: Fri, 6 Oct 2017 11:13:08 -0600
Subject: Generic Pointing Device (#1767)

---
 docs/feature_pointing_device.md | 47 +++++++++++++++++++++++++++++++++++++++++
 docs/features.md                |  2 +-
 2 files changed, 48 insertions(+), 1 deletion(-)
 create mode 100644 docs/feature_pointing_device.md

(limited to 'docs')

diff --git a/docs/feature_pointing_device.md b/docs/feature_pointing_device.md
new file mode 100644
index 000000000..1ba8f7759
--- /dev/null
+++ b/docs/feature_pointing_device.md
@@ -0,0 +1,47 @@
+## Pointing Device
+
+Pointing Device is a generic name for a feature intended to be generic: moving the system pointer arround.  There are certainly other options for it - like mousekeys - but this aims to be easily modifiable and lightweight.  You can implement custom keys to control functionality, or you can gather information from other peripherals and insert it directly here - let QMK handle the processing for you.
+
+To enable Pointing Device, uncomment the following line in your rules.mk:
+
+```
+POINTING_DEVICE_ENABLE = yes
+```
+
+To manipulate the mouse report, you can use the following functions:
+
+* `pointing_device_get_report()` - Returns the current report_mouse_t that represents the information sent to the host computer
+* `pointing_device_set_report(report_mouse_t newMouseReport)` - Overrides and saves the report_mouse_t to be sent to the host computer
+
+Keep in mind that a report_mouse_t (here "mouseReport") has the following properties:
+
+* `mouseReport.x` - this is a signed int from -127 to 127 (not 128, this is defined in USB HID spec) representing movement (+ to the right, - to the left) on the x axis.
+* `mouseReport.y` - this is a signed int from -127 to 127 (not 128, this is defined in USB HID spec) representing movement (+ upward, - downward) on the y axis.
+* `mouseReport.v` - this is a signed int from -127 to 127 (not 128, this is defined in USB HID spec) representing vertical scrolling (+ upward, - downward).
+* `mouseReport.h` - this is a signed int from -127 to 127 (not 128, this is defined in USB HID spec) representing horizontal scrolling (+ right, - left).
+* `mouseReport.buttons` - this is a uint8_t in which the last 5 bits are used.  These bits represent the mouse button state - bit 3 is mouse button 5, and bit 7 is mouse button 1.
+
+When the mouse report is sent, the x, y, v, and h values are set to 0 (this is done in "pointing_device_send()", which can be overridden to avoid this behavior).  This way, button states persist, but movement will only occur once.  For further customization, both `pointing_device_init` and `pointing_device_task` can be overridden.
+
+In the following example, a custom key is used to click the mouse and scroll 127 units vertically and horizontally, then undo all of that when released - because that's a totally useful function.  Listen, this is an example:
+
+```
+case MS_SPECIAL:
+	report_mouse_t currentReport = pointing_device_get_report();
+    if (record->event.pressed)
+    {
+        currentReport.v = 127;
+		currentReport.h = 127;
+		currentReport.buttons |= MOUSE_BTN1; //this is defined in report.h
+    }
+    else
+    {
+        currentReport.v = -127;
+        currentReport.h = -127;
+        currentReport.buttons &= ~MOUSE_BTN1;
+    }
+	pointing_device_set_report(currentReport);
+    break;
+```
+
+Recall that the mouse report is set to zero (except the buttons) whenever it is sent, so the scrolling would only occur once in each case.
\ No newline at end of file
diff --git a/docs/features.md b/docs/features.md
index c5965f4c0..2ef436156 100644
--- a/docs/features.md
+++ b/docs/features.md
@@ -102,4 +102,4 @@ case MACRO_RAISED:
     update_tri_layer(LAYER_LOWER, LAYER_RAISED, LAYER_ADJUST);
   }
   break;
-```
+```
\ No newline at end of file
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