[Octave-bug-tracker] [bug #33118] text rotation fails for angles other than 90 deg

[Andreas Weber]

Follow-up Comment #3, bug #33118 (project octave):

I think FLTK can draw rotated text with fl_rotate and fl_draw.

I stepped through the code and found in 
txt-eng-ft.cc:394:ft_render::render (text_element* elt, Matrix& box, int
rotation) a switch for ROTATION_0, ROTATION_90, ROTATION_180 and ROTATION_270

All values outside x*90 are mapped to ROTATION_0 in
ft_render::rotation_to_mode (double rotation) const.

I'm really not familiar with the octave internals but it seems to me like the
text gets rendered with freetype and the fltk functions only draw the
resulting bitmap in 
opengl_renderer::render_text
gl-render.cc:2992: glDrawPixels (bbox(2), bbox(3),           GL_RGBA,
GL_UNSIGNED_BYTE, pixels.data ());

btw: If I want to compile octave-dev with debugging symbols, what is the
prefered way? Now I made a
../octave/configure --enable-shared --disable-static
make CFLAGS="-O0 -ggdb" CXXFLAGS="-O0 -ggdb"

is this sufficient?
Andy

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