jason wrote:
>> jason wrote:
>>> Where I work we have monitors in reception that are playing videos of
>>> specials, promotions, CEO talking about stuff and so forth.
>>> They are just a series of .VOB files running off of a VLC player on a Win
>>> XP box on the rack.
>>>
>>> My boss has asked that I create a Winform that allows someone to enter text
>>> and submit. This will then create a scrolling ticker across the bottom of
>>> the screen while the video is playing.
>>>
>>> Now I know that I could use Java or C# for this - but I would so love to
>>> use C++ and FLTK - simply because I am looking for any excuse to advance my
>>> knowledge in both (and managed languages are too boring and restrictive.)
>>>
>>> Any ideas?
>> Two easy things come to mind: a borderless window (similar to my
>> 'nixieclock' app) placed over the top of your video playback window
>> so that it can draw whatever it wants; double buffering for smooth
>> scrolling, anti-aliased fonts, etc. eg:
>>
>> http://seriss.com/people/erco/fltk/tmp/video-overlay.png
>>
>> ..where I just placed the nixieclock borderless window
>> over a video playback.
>>
>> But that won't really let you have letters "superimposed"
>> over the video. The letters would have to be on a rectangle,
>> similar to closed-captioning. There might be native OS calls
>> you can use to make the FLTK windows 'see through'; I have
>> no details on that though.
>>
>> The other way would be drawing into the overlay planes,
>> like the way a screen-capture app lets one drag out a
>> rubber band selection over the entire screen.
>>
>> But I don't know if FLTK supports rendering text into the
>> overlay plane.. might only support shapes and vectors in
>> very limited colors, not sure.
>
>
> Thank you very much. The "borderless window" idea is a great start.
>
> Step 1: Create main window as borderless
That should be as simply as:
yourwindow->clear_border();
> Step 2: Figure out how to make it draggable without a title bar at the top
Here's what the nixieclock does: any click down followed by a drag
moves the window around. Just this little bit of code in the
window's handle() function is all it takes to make the window
draggable..
// HANDLE EVENTS IN THE WINDOW
int YourWindow::handle(int e)
{
static int xoff = 0, yoff = 0;
int ret = Fl_Double_Window::handle(e);
switch ( e ) {
// DOWNCLICK IN WINDOW CREATES CURSOR OFFSETS
case FL_PUSH:
xoff = x() - Fl::event_x_root();
yoff = y() - Fl::event_y_root();
ret = 1;
break;
case FL_DRAG:
// DRAG THE WINDOW AROUND THE SCREEN
position(xoff + Fl::event_x_root(), yoff + Fl::event_y_root());
redraw();
ret = 1;
break;
case FL_RELEASE:
show(); // raise
ret =1;
break;
}
return(ret);
}
> Step 3: Figure out how to animate the "scrolling" of the text
Smooth sideways scrolling will be an interesting challenge.
There are some easy cheats such as overriding draw() and
using fl_draw() to draw the text string at different x()
positions.
> Step 4: Consider making the scrollwindow "transparent" some how so that
> the text can appear to float on the v[i]deo.
On OSX I'm pretty sure there's some simple native OSX calls
to make windows of variable transparency which may work with FLTK
too, not sure.
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