[cairo] using cairo in c++

[John Taber]

Thanks Justin, Bill, & Carl - it's now working (Reordering the define 
worked, except I had to comment out snippet, I don't think it is a cairo 
command and the arc parameters then need to be actual x,y's - I took the 
original code from the samples).  I'll work up a nice little demo (with 
saving to png screenshot) and put it in the wiki.

Next stop: testing it on Windows & OSX.  I tested on Debian Linux.



Justin Carlson wrote:
> Looks like an order error.  I think you want to do this instead:
> 
> 
> ******* test.cxx ********
> 
> #define USE_CAIRO 1
> 
> #include <fltk/run.h>
> #include <fltk/DoubleBufferWindow.h>
> #include <fltk/draw.h>
> #include <fltk/x.h>
> 
> 
> Otherwise USE_CAIRO is still undefined when you include x.h, meaning the cairo headers aren't built.
> 
> -J
> 
> 
> On Thu, 2005-10-13 at 04:32 -0600, John Taber wrote:
> 
>>Carl Worth wrote:
>>
>>>On Wed, 12 Oct 2005 09:58:21 -0700, Bill Spitzak wrote:
>>>
>>>
>>>> typedef struct cairo cairo_t;
>>>>
>>>>will work. However this should not be necessary. I believe the 
>>>>definition of cairo_t has changed in cairo 1.0.0 and the x.h file needs 
>>>>to be changed to match.
>>>
>>>
>>>Yes. It is now:
>>>
>>>    typedef struct _cairo cairo_t;
>>>
>>
>>okay - made the above change in fltk/x.h - it recompiles without errors.
>>  And added the #define but still the cairo commands are undefined -
>>here is code - am I calling cairo commands incorrectly ?
>>
>>******* new fltk/x.h ******
>>.....
>># if USE_CAIRO
>>#  include <cairo.h>
>>#  include <cairo-xlib.h>
>># else
>>  typedef struct _cairo cairo_t;
>># endif
>>.......
>>
>>******* test.cxx ********
>>#include <fltk/run.h>
>>#include <fltk/DoubleBufferWindow.h>
>>#include <fltk/draw.h>
>>#include <fltk/x.h>
>>
>>#define USE_CAIRO 1
>>
>>class Drawing : public fltk::Widget {
>>   void draw() {
>>     fltk::push_clip(Rectangle(w(), h()));
>>         snippet_normalize(fltk::cc,w(),h());
>>         cairo_arc(fltk::cc, 0.5, 0.5,0.4,45.0,180.0);
>>         cairo_stroke(fltk::cc);
>>     fltk::pop_clip();
>>   }
>>public:
>>   Drawing(int X,int Y,int W,int H) : fltk::Widget(X,Y,W,H) {}
>>};
>>
>>Drawing *d;
>>
>>int main(int argc, char** argv) {
>>   fltk::DoubleBufferWindow window(300,500);
>>   window.begin();
>>   Drawing drawing(10,10,280,280);
>>   d = &drawing;
>>
>>   window.end();
>>   window.resizable(drawing);
>>   window.show(argc,argv);
>>   return fltk::run();
>>}
>>
>>
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