File: TODO

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jstest-gtk 0.1.1~git20160825-2
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Pre Release Testing:
====================

* check the version number

VERSION="0.1.0"
TAG="v${VERSION}"
git tag -s  "${TAG}" -m "jstest-gtk ${TAG}"
git archive --format=tar --prefix="jstest-gtk-${VERSION}/" ${TAG} | bzip2 -c > /tmp/jstest-gtk-${VERSION}.tar.bz2
git push --tags

==========
[[ TODO ]]
==========

* add ability to plot axis values into a dynamic 2d graph (good for seeing steps/noise)

* use libudev for automatic detection of newly plugged in joysticks
  (would allow getting the correct evdev and doing proper reset of
  joystick calibration values without replug)

* axis mapping seems to behave broken

* grey out Properties when no joystick is present in the list

* Refresh doesn't work (can't find images)

* display "No joystick found" when no joystick is available

* [  Save Profile         ]
  |-----------------------|
  | Name: ............... |
  |  [*] save calibration |
  |  [*] save calibration |
  |         [Cancel] [Ok] |

  Give Overwrite warning when name matches existing one.

* implement command line profile load

* use while loop in Joystick::update

* don't pop up new dialogs when old ones are still present

* [FEATURE] Load and save presets in devices, and to load them automatically
  when you connect the device.

* [CLEANUP] sync evtest_helper.?pp, make sure no boost dependency is
  present

* [CLEANUP] center font in ButtonWidget (current way is a dirty hack)

* [FEATURE] axis names (ABS_X, ...) should be used instead of raw axis numbers
  to guess which layout is correct, also the layout should be properly
  labeled

* [BUG] add some more checks to catch invalid button/axis mappings supplied
  to the joydev interface

* [FEATURE] provide additional support for SDL and evdev devices


=================================
[[ Possible Future Improvments ]]
=================================

* [FEATURE] Possibility of activate noise reduction in joystick axis
  (read only field, but can't hurd to have it, in case any app wants
  to play with it)

* Joystick Database, base it on evdev, not joydev:

* [FEATURE] Watch the system, maybe being in systray, to protect the
  device from accidental reconfiguration by another
  application. (unlikely, as that would mean polling and other then
  jscalibrator there isn't much to mess up joystick calibration)

* draw calibration icon

* draw mapping icon

* Joystick name of a joydev is taken from USB and build up of
  (iManufacturer + iProduct), but thats ugly, (idVendor + idProduct)
  or just idProduct would give much prettier name:

  idVendor           0x045e Microsoft Corp.
  idProduct          0x0007 SideWinder Game Pad
  bcdDevice            1.05
  iManufacturer           1 Microsoft<AE>
  iProduct                2 Microsoft<AE> SideWinder<AE> Game Pad USB

* the joystick name seems to be the only way to link from a joydev to
  a evdev, hack some code together to accomplish that as it would
  allow proper reset of calibration data

* axis names very buggy:
  - ABS_RZ instead of ABS_RUDDER (Sidewinder2)
  - ABS_RZ,ABS_THROTTLE instead of ABS_RX,ABS_RY (Thrustmaster gamepad)
  - BTN_TL2,BTN_TR2 instead of BTN_START, BTN_MODE (Sidewinder gamepad)
  - ...

* create a small database with most common joysticks, maybe add a way
  how a user can automatically submit his joystick profile, to ease
  the database generation

==================
[[ Random Notes ]]
==================

* jscal:

# Remove any calibration and report raw USB data
jsscal -s 6,0,0,0,0,0,0,0,0,0,0,0,0 /dev/input/js0

jscal -s
6, // number of axes

.--- type (0: raw, 1: "broken line")
|  .--- prec (seems to be read only, taken for evdev's absfuzz)
|  |    .---.- coef[0], coef[1], ...
v  v    v   v
1, 0, -15,  15, 5534751,   5534751, ???
1, 0, -15,  15, 5534751,   5534751,
1, 0, -15,  15, 5534751,   5534751,
1, 0, 112, 142, 5534751,   5534751,
1, 0,   0,   0, 536870912, 536870912, (1<<29)
1, 0,   0,   0, 536870912, 536870912

type == 0 -> none of coef used
type == 1 -> coef[0:4] used

type == 0 -> "none (raw)"
type == 1 -> "broken line"

# Original
jscal -s 6,1,0,-15,15,5534751,5534751,1,0,-15,15,5534751,5534751,1,0,-15,15,5534751,5534751,1,0,112,142,5534751,5534751,1,0,0,0,536870912,536870912,1,0,0,0,536870912,536870912 /dev/input/js0

# No Dead
jscal -s 6,1,0,0,0,5534751,5534751,1,0,0,0,5534751,5534751,1,0,0,0,5534751,5534751,1,0,112,142,5534751,5534751,1,0,0,0,536870912,536870912,1,0,0,0,536870912,536870912 /dev/input/js0


int solve_broken(int *results /* coef[4] */, struct correction_data inputs)
{
  results[0] = inputs.cmin[CENTER];
  results[1] = inputs.cmax[CENTER];
  results[2] = (32767.0 / (inputs.cmin[CENTER]  - inputs.cmax[MINIMUM])) * 16384.0;
  results[3] = (32767.0 / (inputs.cmin[MAXIMUM] - inputs.cmax[CENTER]))  * 16384.0;

  results[2] = (32767 * 16384) / left_range
  results[3] = (32767 * 16384) / left_range

  // in float terms:
  // [2] = 1.0f / left_range;
  // [3] = 1.0f / right_range;

  return 1;
}

Apply coef:
===========

  if (value > corr->coef[0])
    {
      if (value < corr->coef[1])
        {
          value = 0;
        }
      else
        {
          value = (corr->coef[3] * (value - corr->coef[1])) / 16384;
        }
    }
  else
    {
      value = (corr->coef[2] * (value - corr->coef[0])) / 16384;
    }

  return value < -32767 ? -32767 : (value > 32767 ? 32767 : value);

Set coef:
=========

  joydev->corr[i].type = JS_CORR_BROKEN;
  joydev->corr[i].prec = dev->absfuzz[j];
  joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
  joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];

  t = (dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j];
  if (t)
    {
      joydev->corr[i].coef[2] = (1 << 29) / t;
      joydev->corr[i].coef[3] = (1 << 29) / t;
    }

# EOF #