synaptic_gesture_compiz.py

#! /usr/bin/env python
# simple 2 finger gesture recognition for synaptic touchpad 
# understand north, east, west, south, NE, NW, SE, SW
# 
# if you have compiz installed with dbus plugin, then this script controls compiz too.
# depends on synclient command. you will need to have it on your machine
# USAGE:
#    synclient -m 20 |python synaptic_gesture_compiz.py

import sys
import os
import compiz

def osd(msg):
    pass 

try:
    import pyosd
    osd=pyosd.osd()
    osd.set_offset(500)
    osd.set_outline_offset(2)
    osd=osd.display
except:
    print >> sys.stderr, ("zoinks! no OSD")
    pass

def synsplit(line):
    result=[]
    d=line
    while True:
        d=d.lstrip()
        end=d.find(' ')
        if (end <0):
            result.append(d)
            return(result)
            break
        else:
            nextfield=d[0:end]
            d=d[end:len(d)]
            result.append(nextfield)
    return(result)

def str_for_delta(delta_x,delta_y):
    res_str=""
    if abs(delta_y)>150:
        if (delta_y<0): 
            res_str=res_str+"N"
        else:
            res_str=res_str+"S"
    if abs(delta_x)>150:
        if (delta_x<0): 
            res_str=res_str+"W"
        else:
            res_str=res_str+"E"
    return(res_str)

def main():
    sys.stdin.readline()
    last_pen_fingers=0
    touchpad=1
    old_osd_str=""
    while not sys.stdin.closed :
	line = sys.stdin.readline()
	ev=synsplit(line)
        if touchpad and ev[4]=="2":	
            os.system("synclient Touchpadoff=1")
            touchpad=0
        if ev[4]=="2":
            try:
                c_delta_x=pen_x-begin_x
                c_delta_y=pen_y-begin_y
                osd_str=str_for_delta(c_delta_x,c_delta_y)
                if old_osd_str!=osd_str:
                   osd("["+osd_str+"]")
                old_osd_str=osd_str
            except:
                pass
        if ev[0]!="time":
            pen_x = int(ev[1])
            pen_y = int(ev[2])
            pen_fingers=int(ev[4])
        if (last_pen_fingers!=2) and (pen_fingers==2):
            begin_x=pen_x
            begin_y=pen_y
        if (last_pen_fingers==2) and (pen_fingers==0):
            delta_x=pen_x-begin_x
            delta_y=pen_y-begin_y
            res_str=str_for_delta(delta_x,delta_y)
            if res_str:
                print res_str
                osd(res_str)
                try:
                    if res_str=="W":
                        compiz.call("rotate","rotate_right_key") 
                    if res_str=="E":
                        compiz.call("rotate","rotate_left_key") 
                    if res_str=="S":
                        compiz.call("scale","initiate_edge") 
                    if res_str=="N":
                        os.system("xset +dpms dpms force off") 
                except:
                    print >> sys.stderr, "Something Borked!"
                    os.system("synclient Touchpadoff=0")
                    touchpad=1
        last_pen_fingers=pen_fingers
        #safety
        if (pen_fingers!=2):
            os.system("synclient Touchpadoff=0")
            touchpad=1

if __name__ == '__main__':
    main()