Joystick Navigation - WorldViz User Forum

Vinicius Lima · #1 10-20-2007, 02:43 PM

Hi,

I am trying to use a joystick to navigate in interior spaces. So, I would like to be able to look up and down at the ceiling and floor and so far, my script is not doing that. I pasted the script I am using here and if I could get the information I am missing it would be great.

Thanks!

Vinicius

import viz
import vizjoy
viz.go()

#Add a ground model
viz.add('tut_ground.wrl')

#Add a joystick
joy = vizjoy.add()

def UpdateJoystick():
#Get the joystick position
x,y,z = joy.getPosition()
#Get the twist of the joystick
twist = joy.getTwist()
#Move the viewpoint forward/backward based on y-axis value
if abs(y) > 0.2: #Make sure value is above a certain threshold
viz.MainView.move(0,0,-y*0.1,viz.BODY_ORI)
#Move the viewpoint left/right based on x-axis value
if abs(x) > 0.2: #Make sure value is above a certain threshold
viz.MainView.move(x*0.1,0,0,viz.BODY_ORI)
#Turn the viewpoint left/right based on twist value
if abs(twist) > 0.2: #Make sure value is above a certain threshold
viz.MainView.rotate(0,1,0,twist,viz.BODY_ORI,viz.R ELATIVE_WORLD)

#UpdateJoystick every frame
vizact.ontimer(0,UpdateJoystick)

#Register a callback for joystick button events
def onjoybutton(e):
print 'Joystick button',e.button,'pressed'
viz.callback(vizjoy.BUTTONDOWN_EVENT,onjoybutton)

farshizzo · #2 10-22-2007, 11:50 AM

Can you please repost your script using the [code][/code] tags?

Vinicius Lima · #3 10-22-2007, 01:08 PM

Hi,

is that the way I'm supposed to do it?

Code:

import viz
import vizjoy
viz.go()

#Add a ground model
viz.add('tut_ground.wrl')

#Add a joystick
joy = vizjoy.add()

def UpdateJoystick():
#Get the joystick position
x,y,z = joy.getPosition()
#Get the twist of the joystick
twist = joy.getTwist()
#Move the viewpoint forward/backward based on y-axis value
if abs(y) > 0.2: #Make sure value is above a certain threshold
viz.MainView.move(0,0,-y*0.1,viz.BODY_ORI)
#Move the viewpoint left/right based on x-axis value
if abs(x) > 0.2: #Make sure value is above a certain threshold
viz.MainView.move(x*0.1,0,0,viz.BODY_ORI)
#Turn the viewpoint left/right based on twist value
if abs(twist) > 0.2: #Make sure value is above a certain threshold
viz.MainView.rotate(0,1,0,twist,viz.BODY_ORI,viz.R ELATIVE_WORLD)

#UpdateJoystick every frame
vizact.ontimer(0,UpdateJoystick)

#Register a callback for joystick button events
def onjoybutton(e):
print 'Joystick button',e.button,'pressed'
viz.callback(vizjoy.BUTTONDOWN_EVENT,onjoybutton)

farshizzo · #4 10-22-2007, 01:11 PM

No, you need to copy the code from Vizard then paste it into the form inside the code tags. The reason this is necessary is because it will preserve the original indentation of your code. Without the indentation, I cannot run your code.

Vinicius Lima · #5 10-22-2007, 01:14 PM

I'm trying again.

Code:

import viz
import vizjoy
viz.go()

#Add a ground model
viz.add('tut_ground.wrl')

#Add a joystick
joy = vizjoy.add()

def UpdateJoystick():
    #Get the joystick position
    x,y,z = joy.getPosition()
    #Get the twist of the joystick
    twist = joy.getTwist()
    #Move the viewpoint forward/backward based on y-axis value
    if abs(y) > 0.2: #Make sure value is above a certain threshold
        viz.MainView.move(0,0,-y*0.1,viz.BODY_ORI)
    #Move the viewpoint left/right based on x-axis value
    if abs(x) > 0.2: #Make sure value is above a certain threshold
        viz.MainView.move(x*0.1,0,0,viz.BODY_ORI)
    #Turn the viewpoint left/right based on twist value
    if abs(twist) > 0.2: #Make sure value is above a certain threshold
        viz.MainView.rotate(0,1,0,twist,viz.BODY_ORI,viz.RELATIVE_WORLD)

#UpdateJoystick every frame
vizact.ontimer(0,UpdateJoystick)

#Register a callback for joystick button events
def onjoybutton(e):
    print 'Joystick button',e.button,'pressed'
viz.callback(vizjoy.BUTTONDOWN_EVENT,onjoybutton)

farshizzo · #6 10-22-2007, 02:04 PM

I tried your script and the behavior I get is that moving the joystick forward/backward will move the viewpoint forward/backward. Moving the joystick left/right will move the viewpoint left/right. Turning the joystick will also turn the viewpoint. Is this not what you want? I don't understand what the problem is.

Vinicius Lima · #7 10-23-2007, 10:39 AM

well, what I am trying to do is be able to navigate in a room and look up and down as well (at the ceiling and the floor). So far, with this script I haven't been able to.

farshizzo · #8 10-23-2007, 10:42 AM

You've programmed the script to move the viewpoint when the joystick is moved. If you want the viewpoint to look up/down when the joystick is moved, then use the viewpoint.rotate() command instead of the viewpoint.move() command.