updating positional data

[Saz]

Hi Jeff,

thanks for that, the joystick position is updating fine now once I took the textbox out of the timer loop. No, for the second part the code for the joystick position is working fine but what I am getting up on the screen at the moment is obviously the raw data of the joystick output - which is pretty meaningless to the observer, additionally it appears in the co ordinate system format of [0.0 0.0 0.0], wheareas I'm only really interested in the y co ordinate.

Therefore I'm trying to multiply the raw data of the joystick that's already acquired so that it appears in a meaningful context on the screen, say as mph or kph - which is what I'm having difficulty with

[Jeff]

this should update the speed in just the y direction every time the timer function is called

#add textbox and set position on screen
text_speed = viz.addTextbox(parent = viz.SCREEN)
text_speed.setPosition(.15, .9 ) 
text_speed.fontSize (30)

old_posY = 0
def showSpeed():
	
	global old_posY
	
	current_pos = viz.MainView.getPosition()
	current_posY = current_pos[1]
	distance = abs(current_posY - old_posY)
	
	#get speed in meters/sec
	speed = distance/viz.elapsed()
	#get speed in km/hour
	speed = speed/1000*3600
	
	old_posY = current_posY
	
	#enter speed in textbox rounded to 1 digit after decimal
	text_speed.message(str(round(speed,1)) + 'km/hour')
	
vizact.ontimer(.25, showSpeed)

[Saz]

Hi Jeff,

thanks for that - unfortunately it doesn't update and I constantly get 0.0km/hr on the screen - even though its moving along the road. I tried inserting joy.getPosition() in place of viz.MainView.getPosition() to see whether the code in principle functions and whilst that does produce a change in km/hr when either accelerating or deccelerating, because this piece of code is looking at a difference between outputs - when the joystick is held constant; there is no difference and so 0.0km/hr appears on the screen

[Jeff]

That code should give you 0 km/hour if you are not moving along the y-axis which is the height. I think you may be wanting to get the speed along the z-axis. If that's the case then just dind the difference in z coordinates rather than the y coordinates.

[Jeff]

just to clarify, in the joystick navigation code, when you move the joystick on its y-axis that moves Vizard's viewpoint forward or backward which is Vizard's z axis. So to get the current z position just do

current_posZ = current_pos[2]

[Saz]

you're a star Jeff - thank you!! Is there any reason that I'm getting a continual drift of the viewpoint to the right though, even if I'm not using the joystick?

[Saz]

Don't worry Jeff - its sorted! Cheers for your help!