63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
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// Taken from http://cgit.freedesktop.org/cairomm/plain/examples/surfaces/image-surface.cc
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/* M_PI is defined in math.h in the case of Microsoft Visual C++, Solaris,
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* et. al.
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*/
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#if defined(_MSC_VER)
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#define _USE_MATH_DEFINES
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#endif
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#include <string>
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#include <iostream>
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#include <cairommconfig.h>
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#include <cairomm/context.h>
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#include <cairomm/surface.h>
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#include <cmath>
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int main()
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{
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Cairo::RefPtr<Cairo::ImageSurface> surface =
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Cairo::ImageSurface::create(Cairo::FORMAT_ARGB32, 600, 400);
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Cairo::RefPtr<Cairo::Context> cr = Cairo::Context::create(surface);
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cr->save(); // save the state of the context
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cr->set_source_rgb(0.86, 0.85, 0.47);
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cr->paint(); // fill image with the color
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cr->restore(); // color is back to black now
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cr->save();
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// draw a border around the image
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cr->set_line_width(20.0); // make the line wider
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cr->rectangle(0.0, 0.0, surface->get_width(), surface->get_height());
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cr->stroke();
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cr->set_source_rgba(0.0, 0.0, 0.0, 0.7);
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// draw a circle in the center of the image
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cr->arc(surface->get_width() / 2.0, surface->get_height() / 2.0,
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surface->get_height() / 4.0, 0.0, 2.0 * M_PI);
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cr->stroke();
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// draw a diagonal line
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cr->move_to(surface->get_width() / 4.0, surface->get_height() / 4.0);
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cr->line_to(surface->get_width() * 3.0 / 4.0, surface->get_height() * 3.0 / 4.0);
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cr->stroke();
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cr->restore();
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#ifdef CAIRO_HAS_PNG_FUNCTIONS
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std::string filename = "image.png";
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surface->write_to_png(filename);
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std::cout << "Wrote png file \"" << filename << "\"" << std::endl;
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#else
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std::cout << "You must compile cairo with PNG support for this example to work."
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<< std::endl;
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#endif
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}
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