On Wed, 27 Sep 2006 15:42:43 +0200, Laurens wrote:
> Hi,
>
> I have a couple of draw widgets displaying various gamma-scans. Now the
> user has to select two of them by clicking on them; done.
> But now I want to let the user know where he clicked, so is it possible
> to draw some sort of red border of a few pix around the clicked
> draw-widget? I know they have a frame property, but that's just too thin
> and doesn't attract attention...
You could make the frame thicker. Something like:
IDL> b=widget_base(/ROW)
IDL> t=widget_draw(b,xsize=200,ysize=200,FRAME=10)
IDL> b2=widget_base(b,xsize=200,ysize=200,xpad=10,ypad=10,/COLUMN )
IDL> t2=widget_draw(b2,xsize=200,ysize=200)
IDL> widget_control, b,/realize
Unfortunately with this setup, you'll have to kill and re-create
everything whenever the user selects a new draw widget (since FRAME's
are only possible when the widget is created). Not ideal. You'll
probably want to use UPDATE=0/1 to avoid flickering.
Here's a trick that avoids all that killing/recreating. Use a
bulletin board base (no /ROW or /COLUMN), and then layer two bases
inside it: one which holds your draw widget, offset by 10 pixels in x an
y, and one empty base which has FRAME=10 set, whose only purpose in life
is to display that frame. Simply map and unmap the empty draw base to
add/remove the frame as necessary. Something like:
IDL> b=widget_base()
IDL> b1=widget_base(b,xsize=200,ysize=200,xpad=10,ypad=10)
IDL> t=widget_draw(b1,xsize=200,ysize=200)
IDL> b2=widget_base(b,xsize=200,ysize=200,FRAME=10)
IDL> widget_control, b,/realize
IDL> widget_control, b2,map=0 ; remove frame
IDL> widget_control, b2,map=1 & widget_control, b1,map=1 ; add frame back
To make it easier, wrap this functionality up in a compound
"frame-toggle-draw" widget of some sort, and then layout as many of
these as you need. I might instead make it an object widget for
additional convenience (so I can pass it an image to draw, tell it to
erase, etc.), but a regular compound widget would work as well. Then
something like:
widget_control,frame_toggle_draw_widget_id,SET_VALUE=0 ; turn frame off
could be enough to "de-select" that draw.
JD
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
