R help - Jun 2014 - Rgl: set trackball behavior

I would like to set  zoom mouse control in rgl in order to redraw the map with
more or less details depending of the zoom coefficient (such as google maps or
openstreetmap do).

I already tried the rgl.setMouseCallbacks(button, begin = NULL, update = NULL,
end = NULL) function but this function do not seem to work with  trackball (only
left, middle and right click).

Thus the question is :is it possible to modify trackball function using rgl ? 
Thank for your help 		 	   		  
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On 11/06/2014, 5:02 AM, C?line b wrote:
> I would like to set  zoom mouse control in rgl in order to redraw the map
with more or less details depending of the zoom coefficient (such as google maps
or openstreetmap do).
> 
> I already tried the rgl.setMouseCallbacks(button, begin = NULL, update =
NULL, end = NULL) function but this function do not seem to work with  trackball
(only left, middle and right click).
> 
> Thus the question is :is it possible to modify trackball function using rgl
?

When you say "trackball", do you mean the mouse wheel?  If so, the
answer is no, it can't be modified, but it does seem like it would be a
good idea. I'll add it to the to-do list.

Duncan Murdoch

Hello,

I'm trying to add a colorbar to a 3d map using rgl.
For this purpose, I draw the map in a similar way of persp3d example : 

lat <- matrix(seq(90,-90, len=50)*pi/180, 50, 50, byrow=TRUE)
long <- matrix(seq(-180, 180, len=50)*pi/180, 50, 50)

r <- 6378.1 # radius of Earth in km
x <- r*cos(lat)*cos(long)
y <- r*cos(lat)*sin(long)
z <- r*sin(lat)

open3d()
persp3d(x, y, z, col="white", 
      
texture=system.file("textures/worldsmall.png",package="rgl"),
       specular="black", axes=FALSE, box=FALSE, xlab="",
ylab="", zlab="",
       normal_x=x, normal_y=y, normal_z=z)

then I add a basic colorbar drawing several 3d colored cubes and label them
using text3d

shapelist3d(cube3d(), x,y,z, col=grey.colors(5),add=T)
text3d(x+dx,y+dy,z+dz,"label")

The results is ok (if someone know a better way to do it, please tell me how)
Now I would like to improve the result and in particular I would like to have a
static colorbar (stick to a plan parallel to the window) when I rotate the
"earth".
My first idea is to redefine the rotation button using  rgl.setMouseCallbacks
and then pop and redraw colorbar in update fonction of   rgl.setMouseCallback.
1/ Is it a good idea ?
2/ How to get angle and x,y,z value  to compute rotationMatrix(angle,x,y,z) from
window coordinates ?
3/ Is it possible, in the same idea,  to have a static colorbar when I zoom on a
earth region ?

I hope my question is clear (as you see I am not a  native english speaker) and
thank you for your answers.
  		 	   		  
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