sam@uncle-bens.rice.edu (Samuel R Johnson) (12/18/90)
hello. i've been not keeping up wih this group since last summer,
so i apologize if any of this has been covered previously...
two questions:
with Xt, Athena - is there any *clean* way to get a command widget to
display a pixmap? like, maybe a happy face or a frog or something?
also with Xt, Athena - i realize this is taboo, but sometimes i'd really
like to just draw into a widget with Xlib routines for one reason or
another. when i try to do an
XDrawRectangle(XtDisplay(w),XtWindow(w),XtGetGC(w,0,&val),
0, 0, width, height);
i get nothing. thinking that perhaps the colors are set incorrectly (invisibly)
for the widget in its GC, i tried creating my own
gc = XCreateGC(XtDisplay(w),XtWindow(w),None,NULL); /* defaults */
XDrawRectangle(XtDisplay(w),XtWindow(w),gc,
0, 0, width, height);
but still see nothing. any ideas?
thanks a bunch.
-Sam
sam@owlnet.rice.eduetaylor@wilkins.iaims.bcm.tmc.edu (Eric Taylor) (12/19/90)
In article <1990Dec18.142305.23701@rice.edu>, sam@uncle-bens.rice.edu (Samuel R Johnson) writes: |> hello. i've been not keeping up wih this group since last summer, |> so i apologize if any of this has been covered previously... |> |> two questions: |> |> with Xt, Athena - is there any *clean* way to get a command widget to |> display a pixmap? like, maybe a happy face or a frog or something? XtNbitmap resource. |> |> also with Xt, Athena - i realize this is taboo, but sometimes i'd really |> like to just draw into a widget with Xlib routines for one reason or |> another. when i try to do an |> |> XDrawRectangle(XtDisplay(w),XtWindow(w),XtGetGC(w,0,&val), |> 0, 0, width, height); |> |> i get nothing. thinking that perhaps the colors are set incorrectly (invisibly) You are using XtGetGC all wrong. First of all, you are passing 0 as the flag list. This means you will be getting a GC with nothing in it. You did not tell it which members of the XGCValues you wanted to use. You should create this GC beforehand so that you can free it up later. Here, you can never free it up. |> for the widget in its GC, i tried creating my own |> |> gc = XCreateGC(XtDisplay(w),XtWindow(w),None,NULL); /* defaults */ |> XDrawRectangle(XtDisplay(w),XtWindow(w),gc, |> 0, 0, width, height); This uses the Default GC settings which are unpredictable. Why not set the foreground explicitly? |> |> but still see nothing. any ideas? |> |> thanks a bunch. |> |> -Sam |> sam@owlnet.rice.edu -- Eric Taylor Baylor College of Medicine etaylor@wilkins.bcm.tmc.edu (713) 798-3776
mouse@LIGHTNING.MCRCIM.MCGILL.EDU (12/19/90)
>> gc = XCreateGC(XtDisplay(w),XtWindow(w),None,NULL); /* defaults */ > This uses the Default GC settings which are unpredictable. Not at all - only the font is in any sense unpredictable, unless the implementation is seriously buggy. From the Xlib document: The default GC values are: _________________________________________________________________________________ Component Default _________________________________________________________________________________ function GXcopy plane_mask All ones foreground 0 background 1 line_width 0 line_style LineSolid cap_style CapButt join_style JoinMiter fill_style FillSolid fill_rule EvenOddRule arc_mode ArcPieSlice tile Pixmap of unspecified size filled with foreground pixel (that is, client specified pixel if any, else 0) (subsequent changes to foreground do not affect this pixmap) stipple Pixmap of unspecified size filled with ones ts_x_origin 0 ts_y_origin 0 font <implementation dependent> subwindow_mode ClipByChildren graphics_exposures True clip_x_origin 0 clip_y_origin 0 clip_mask None dash_offset 0 dashes 4 (that is, the list [4, 4]) _________________________________________________________________________________ Note that foreground and background are not set to any values likely to be useful in a window. der Mouse old: mcgill-vision!mouse new: mouse@larry.mcrcim.mcgill.edu