diff options
Diffstat (limited to '3rdparty/sdl2/docs/README-touch.md')
-rw-r--r-- | 3rdparty/sdl2/docs/README-touch.md | 86 |
1 files changed, 0 insertions, 86 deletions
diff --git a/3rdparty/sdl2/docs/README-touch.md b/3rdparty/sdl2/docs/README-touch.md deleted file mode 100644 index 20925c41fb0..00000000000 --- a/3rdparty/sdl2/docs/README-touch.md +++ /dev/null @@ -1,86 +0,0 @@ -Touch -=========================================================================== -System Specific Notes -=========================================================================== -Linux: -The linux touch system is currently based off event streams, and proc/bus/devices. The active user must be given permissions to read /dev/input/TOUCHDEVICE, where TOUCHDEVICE is the event stream for your device. Currently only Wacom tablets are supported. If you have an unsupported tablet contact me at jim.tla+sdl_touch@gmail.com and I will help you get support for it. - -Mac: -The Mac and iPhone APIs are pretty. If your touch device supports them then you'll be fine. If it doesn't, then there isn't much we can do. - -iPhone: -Works out of box. - -Windows: -Unfortunately there is no windows support as of yet. Support for Windows 7 is planned, but we currently have no way to test. If you have a Windows 7 WM_TOUCH supported device, and are willing to help test please contact me at jim.tla+sdl_touch@gmail.com - -=========================================================================== -Events -=========================================================================== -SDL_FINGERDOWN: -Sent when a finger (or stylus) is placed on a touch device. -Fields: -* event.tfinger.touchId - the Id of the touch device. -* event.tfinger.fingerId - the Id of the finger which just went down. -* event.tfinger.x - the x coordinate of the touch (0..1) -* event.tfinger.y - the y coordinate of the touch (0..1) -* event.tfinger.pressure - the pressure of the touch (0..1) - -SDL_FINGERMOTION: -Sent when a finger (or stylus) is moved on the touch device. -Fields: -Same as SDL_FINGERDOWN but with additional: -* event.tfinger.dx - change in x coordinate during this motion event. -* event.tfinger.dy - change in y coordinate during this motion event. - -SDL_FINGERUP: -Sent when a finger (or stylus) is lifted from the touch device. -Fields: -Same as SDL_FINGERDOWN. - - -=========================================================================== -Functions -=========================================================================== -SDL provides the ability to access the underlying Finger structures. -These structures should _never_ be modified. - -The following functions are included from SDL_touch.h - -To get a SDL_TouchID call SDL_GetTouchDevice(index). -This returns a SDL_TouchID. -IMPORTANT: If the touch has been removed, or there is no touch with the given ID, SDL_GetTouchID will return 0. Be sure to check for this! - -The number of touch devices can be queried with SDL_GetNumTouchDevices(). - -A SDL_TouchID may be used to get pointers to SDL_Finger. - -SDL_GetNumTouchFingers(touchID) may be used to get the number of fingers currently down on the device. - -The most common reason to access SDL_Finger is to query the fingers outside the event. In most cases accessing the fingers is using the event. This would be accomplished by code like the following: - - float x = event.tfinger.x; - float y = event.tfinger.y; - - - -To get a SDL_Finger, call SDL_GetTouchFinger(touchID,index), where touchID is a SDL_TouchID, and index is the requested finger. -This returns a SDL_Finger*, or NULL if the finger does not exist, or has been removed. -A SDL_Finger is guaranteed to be persistent for the duration of a touch, but it will be de-allocated as soon as the finger is removed. This occurs when the SDL_FINGERUP event is _added_ to the event queue, and thus _before_ the SDL_FINGERUP event is polled. -As a result, be very careful to check for NULL return values. - -A SDL_Finger has the following fields: -* x,y,pressure: - The current coordinates of the touch. -* pressure: - The pressure of the touch. - - -=========================================================================== -Notes -=========================================================================== -For a complete example see test/testgesture.c - -Please direct questions/comments to: - jim.tla+sdl_touch@gmail.com - (original author, API was changed since) |