diff options
author | Jim Grandpre <jim.tla@gmail.com> | 2010-08-19 13:47:12 -0400 |
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committer | Jim Grandpre <jim.tla@gmail.com> | 2010-08-19 13:47:12 -0400 |
commit | f1b2b9f8016d764c060a98dffc73e6fca31d0aef (patch) | |
tree | b34b8c1c307f803175fb2b17a5f25a0f337d7aec /README.touch | |
parent | 794c5cb3ee58b4d790ebd1e87da60b40e646609c (diff) |
Updated README's
Diffstat (limited to 'README.touch')
-rw-r--r-- | README.touch | 44 |
1 files changed, 34 insertions, 10 deletions
diff --git a/README.touch b/README.touch index becb89fb..4ce12718 100644 --- a/README.touch +++ b/README.touch @@ -1,4 +1,19 @@ =========================================================================== +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 API's 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. + +Winows: +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: @@ -14,8 +29,8 @@ SDL_FINGERMOTION: Sent when a finger (or stylus) is moved on the touch device. Fields: Same as FINGERDOWN but with additional: -event.tfginer.dx - chagne in x coordinate during this motion event. -event.tfginer.dy - chagne in y coordinate during this motion event. +event.tfginer.dx - change in x coordinate during this motion event. +event.tfginer.dy - change in y coordinate during this motion event. SDL_FINGERMOTION: Sent when a finger (or stylus) is lifted from the touch device. @@ -36,13 +51,13 @@ This returns an SDL_Touch*. IMPORTANT: If the touch has been removed, or there is no touch with the given ID, SDL_GetTouch will return null. Be sure to check for this! An SDL_Touch has the following fields: +>xres,yres,pressures: + The resolution at which x,y, and pressure values are reported. Currently these will always be equal to 2^15, but this may not always be the case. + >pressure_max, pressure_min, x_max, x_min, y_max, y_min Which give, respectively, the maximum and minumum values that the touch digitizer can return for pressure, x coordiniate, and y coordinate AS REPORTED BY THE OPERATING SYSTEM. On Mac/iPhone systems _max will always be 0, and _min will always be 1. ->xres,yres,pressures: - The resolution at which x,y, and pressure values are reported. Currently these will always be equal to 2^15, but this may not always be the case. - >native_xres,native_yres,native_pressureres: The native resolution of the touch device AS REPORTED BY THE OPERATING SYSTEM. On Mac/iPhone systems these will always be 1. @@ -54,18 +69,19 @@ On Mac/iPhone systems these will always be 1. An array of pointers to the fingers which are on the device. -The most common reason to get a touch device is to normalize inputs. This would look something like: +The most common reason to access a touch device is to normalize inputs. This would be accomplished by code like the following: SDL_Touch* inTouch = SDL_GetTouch(event.tfinger.touchId); - if(inTouch == NULL) continue; + if(inTouch == NULL) continue; //The touch has been removed float x = ((float)event.tfinger.x)/inTouch->xres; - float y = ((float)event.tfinger.y)/inTouch->yres; + float y = ((float)event.tfinger.y)/inTouch->yres; + To get an SDL_Finger, call SDL_GetFinger(touch,fingerId), where touch is a pointer to an SDL_Touch device, and fingerId is the id of the requested finger. This returns an SDL_Finger*, or null if the finger does not exist, or has been removed. -An 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 FINGERUP event is seen. +An 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 FINGERUP event is polled. As a result, be very careful to check for null return values. An SDL_Finger has the following fields: @@ -74,4 +90,12 @@ An SDL_Finger has the following fields: >xdelta,ydelta: The change in position resulting from the last finger motion. >last_x, last_y, last_pressure: - The previous coordinates of the touch.
\ No newline at end of file + The previous coordinates of the touch. + +=========================================================================== +Notes +=========================================================================== +For a complete example see test/testgesture.c + +Please direct questions/comments to: + jim.tla+sdl_touch@gmail.com
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