dynamic UI element in maxscript - image

Question

Can anyone show a way to make dynamic UI elements in maxscript?
For example. I can insert a image button in the ui, but i'd like to control the scale of the image based on the value of a slider element.

Answer 1

I did find a way to make a dynamic user interface,
that was the first part of the problem.
But i did not get it to make image button sizes dynamic yet.(mainly because if i use group elements in the way i want to, then the position of every element is hard coded.
try(destroydialog dRolH) catch()
rollout dRolH "Dialog" height:200 width:200
(
dropdownlist rolList "Rollouts: " items:#("Rollout A", "Rollout B", "Rollout C") width:175 offset:[0,0]
checkbox lbA "A" pos:[14,50] visible:off
checkbox lbB "B" pos:[14,50] visible:off
checkbox lbC "C" pos:[14,50] visible:off
local rolls = #(#(lbA), #(lbB), #(lbC))
on rolList selected sel do
(
for k=1 to rolls.count do for c in rolls[k] do c.visible = (k == sel)
)
)
createDialog dRolH pos:[740, 200]

Answer 2

See, this is a bit more complicated.
Changing the width and height values of the bitmap element is pretty easy:
bitmap bm "Bitmap:" filename:#"some/file/path.jpg" -- create the bitmap UI element
bm.width = 100
bm.height = 100
But this will only change the size of the bitmap framing. You will also need to rerender the bitmap in a new resolution and switch out the old one. I have implemented this in your code here:
try(destroydialog dRolH) catch()
rollout dRolH "Dialog" height:200 width:200
(
dropdownlist rolList "Rollouts: " items:#("Rollout A", "Rollout B", "Rollout C") width:175 offset:[0,0]
checkbox lbA "A" pos:[14,50] visible:off
checkbox lbB "B" pos:[14,50] visible:off
checkbox lbC "C" pos:[14,50] visible:off
spinner s "Size (%)" range:[0,1000,100]
local bm_height = 128
local bm_width = 128
bitmap bm "Bitmap" height:bm_height width:bm_width fileName:#"C:\ProgramData\Microsoft\User Account Pictures\Default Pictures\usertile12.bmp"
fn scaleAndReloadImage factor =
(
-- New sizes
bm.height = bm_height * factor
bm.width = bm_width * factor
-- Loadimage and
local image = Bitmaptexture filename:#"C:\ProgramData\Microsoft\User Account Pictures\Default Pictures\usertile12.bmp"
-- Rerender into new bitmap
local new_bm = bitmap bm.width bm.height
rendermap image into:new_bm size:([image.bitmap.width,image.bitmap.height]) filter:on display:off gamma:2.2
-- Assign new bitmap
bm.bitmap = new_bm
)
-- EVENTS
local rolls = #(#(lbA), #(lbB), #(lbC))
on rolList selected sel do
(
for k=1 to rolls.count do for c in rolls[k] do c.visible = (k == sel)
)
on s changed val do
(
if val == 0 then s.value = val = 100 -- Resets to 100 on rightclick
local factor = val / 100 -- Scaling factor
scaleAndReloadImage factor
)
on dRolH open do
(
scaleAndReloadImage 1 -- Render image from start, to secure uniform gamma
)
)
createDialog dRolH pos:[740, 200] height:400
I have put in a few comments for you as well.
Happy hacking :D :)
/goehler
NB: The address I use for the bitmap will probably only work in Windows 7 - but I imagine you have the sense to use another address if need be :)