POINTER(3)POINTER(3)NAMEpointer - mouse and stylus interface
SYNOPSIS
bind -a #m /dev
/dev/cursor
/dev/pointer
DESCRIPTION
The pointer device is the interface to input from a mouse, stylus, or
some other device for pointing at positions on a display. On some
platforms, the pointer is associated with a cursor on the display, that
is displayed at the current pointer position. There often are buttons
associated with the pointer, whether on the pointing device or else‐
where. For instance, some of the buttons on a PDA might be associated
with the stylus not a keypad, to allow modification of stylus actions
when there are are no buttons on the stylus itself. In the hosted
environment of emu(1), the pointer is associated with the host system's
own pointing device.
Reading the pointer file returns the current pointer position and the
state of any buttons associated with the pointer. The read blocks
until the state has changed since the last read. Each read returns a
49 byte record:
mx y buttons msec
Each record has the letter m immedlately followed by four 11-character
decimal numbers, each number ended by a blank. X and y give the coor‐
dinates of the pointer in display coordinates; the value buttons has
bit (1<<b) set when button b is down; and msec is a time stamp in mil‐
liseconds.
Writing a record of the above form to pointer moves the displayed cur‐
sor to the given x and y position; buttons and msec are ignored.
Writing an image(6) file to the cursor file sets the image of the cur‐
sor on the display. Reading cursor returns the current cursor image,
again in image(6) format.
SOURCE
/emu/port/devpointer.c
/os/port/devpointer.c
SEE ALSOwm(1), draw-intro(2), image(6)POINTER(3)
