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https://github.com/Mercury-Language/mercury.git
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7a85f13389
distribution. (For further information see, <http://www.cairographics.org/>.) The binding is currently fairly complete (enough for the cairo sample and tutorial programs to be work in Mercury). The main things missing are: * scaled fonts * a few operations on patterns (grep for NYI) * support for X, Quartz, or Win32 surfaces * font backends other than the builtin toy one TODO: I'll add README files, Makefiles, update the NEWS file, etc in a separate change. extras/graphics/mercury_cairo/*.m: extras/graphics/mercury_cairo/tutorial/*.m: extras/graphics/mercury_cairo/samples/*.m: extras/graphics/mercury_cairo/samples/data/*.png: Add the Mercury cairo binding.
72 lines
2.5 KiB
Mathematica
72 lines
2.5 KiB
Mathematica
%-----------------------------------------------------------------------------%
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:- module setsourcegradient.
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:- interface.
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:- import_module io.
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%-----------------------------------------------------------------------------%
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:- pred main(io::di, io::uo) is det.
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%-----------------------------------------------------------------------------%
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%-----------------------------------------------------------------------------%
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:- implementation.
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:- import_module cairo.
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:- import_module cairo.image.
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:- import_module cairo.path.
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:- import_module cairo.pattern.
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:- import_module cairo.png.
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:- import_module cairo.transformations.
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:- import_module float.
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:- import_module int.
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%-----------------------------------------------------------------------------%
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main(!IO) :-
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cairo.image.create_surface(format_argb32, 120, 120, Surface, !IO),
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cairo.create_context(Surface, Context, !IO),
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cairo.transformations.scale(Context, 120.0, 120.0, !IO),
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cairo.pattern.create_radial(0.25, 0.25, 0.1, 0.5, 0.5, 0.5, RadPat, !IO),
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cairo.pattern.add_color_stop_rgb(RadPat, 0.0, 1.0, 0.8, 0.8, !IO),
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cairo.pattern.add_color_stop_rgb(RadPat, 1.0, 0.9, 0.0, 0.0, !IO),
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int.fold_up(draw_rectangle(Context), 1, 9, !IO),
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cairo.set_source(Context, RadPat, !IO),
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cairo.fill(Context, !IO),
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cairo.pattern.create_linear(0.25, 0.35, 0.75, 0.65, LinPat, !IO),
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cairo.pattern.add_color_stop_rgba(LinPat, 0.00, 1.0, 1.0, 1.0, 0.0, !IO),
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cairo.pattern.add_color_stop_rgba(LinPat, 0.25, 0.0, 1.0, 0.0, 0.5, !IO),
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cairo.pattern.add_color_stop_rgba(LinPat, 0.50, 1.0, 1.0, 1.0, 0.0, !IO),
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cairo.pattern.add_color_stop_rgba(LinPat, 0.75, 0.0, 0.0, 1.0, 0.5, !IO),
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cairo.pattern.add_color_stop_rgba(LinPat, 1.00, 1.0, 1.0, 1.0, 0.0, !IO),
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cairo.path.rectangle(Context, 0.0, 0.0, 1.0, 1.0, !IO),
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cairo.set_source(Context, LinPat, !IO),
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cairo.fill(Context, !IO),
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cairo.png.write_surface_to_png(Surface, "setsourcegradient.png", !IO).
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:- pred draw_rectangle(context(S)::in, int::in, io::di, io::uo)
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is det <= surface(S).
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draw_rectangle(Context, I, !IO) :-
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int.fold_up(draw_rectangle_2(Context, I), 1, 9, !IO).
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:- pred draw_rectangle_2(context(S)::in, int::in, int::in, io::di, io::uo)
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is det <= surface(S).
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draw_rectangle_2(Context, I, J, !IO) :-
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cairo.path.rectangle(Context, float(I) / 10.0 - 0.04,
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float(J) / 10.0 - 0.04, 0.08, 0.08, !IO).
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%-----------------------------------------------------------------------------%
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:- end_module setsourcegradient.
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%-----------------------------------------------------------------------------%
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