[cairo-commit] cairomm/examples/png_file Makefile.am, NONE, 1.1 main.cc, NONE, 1.1

[Murray Cumming]

Committed by: murrayc

Update of /cvs/cairo/cairomm/examples/png_file
In directory gabe:/tmp/cvs-serv1730/examples/png_file

Added Files:
	Makefile.am main.cc 
Log Message:
2006-01-06  Jonathon Jongsma  <jonathon.jongsma at gmail.com>

        * cairomm/surface.cc:
        * cairomm/surface.h: Added implementation of write_to_png() and
        write_to_png_stream() when PNG support is available in the base cairo
        library
        * examples/png_file/*: Added an example of creating an image surface and
        saving it to a png image file
        * examples/Makefile.am: add new example directory to SUBDIRS list
        * configure.in: added output declaration for examples/png_file/Makefile
        * examples/makefile.am_fragment: fix leftover libxml boilerplate


--- NEW FILE: Makefile.am ---
include $(top_srcdir)/examples/Makefile.am_fragment

# build the executable but don't install it
noinst_PROGRAMS = example_png_file
example_png_file_SOURCES = main.cc

--- NEW FILE: main.cc ---
#include <string>
#include <iostream>
#include <cairomm/cairomm.h>

int main(int argc, char** argv)
{
    Cairo::RefPtr<Cairo::Surface> surface =
        Cairo::Surface::create(CAIRO_FORMAT_ARGB32, 600, 400);

    Cairo::RefPtr<Cairo::Context> cr = Cairo::Context::create(surface);

    cr->save(); // save the state of the context
    cr->set_source_rgb(0.86, 0.85, 0.47);
    cr->paint();    // fill image with the color
    cr->restore();  // color is back to black now

    cr->save();
    // draw a border around the image
    cr->set_line_width(20.0);    // make the line wider
    cr->rectangle(0.0, 0.0, surface->get_width(), surface->get_height());
    cr->stroke();

    cr->set_source_rgba(0.0, 0.0, 0.0, 0.7);
    // draw a circle in the center of the image
    cr->arc(surface->get_width() / 2.0, surface->get_height() / 2.0, 
            surface->get_height() / 4.0, 0.0, 2.0 * M_PI);
    cr->stroke();

    // draw a diagonal line
    cr->move_to(surface->get_width() / 4.0, surface->get_height() / 4.0);
    cr->line_to(surface->get_width() * 3.0 / 4.0, surface->get_height() * 3.0 / 4.0);
    cr->stroke();
    cr->restore();

#ifdef CAIRO_HAS_PNG_FUNCTIONS

    std::string filename = "example_png_file.png";
    surface->write_to_png(filename);

    std::cout << "Wrote png file \"" << filename << "\"" << std::endl;

#else

    std::cout << "You must compile cairo with PNG support for this example to work."
        << std::endl;

#endif
}