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Support drawing polygons in gfx::painter

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This commit is contained in:
Nikita Lisitsa 2024-08-20 11:51:12 +03:00
parent a2c83633ae
commit c16194c95c
2 changed files with 17 additions and 0 deletions
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1
libs/gfx/include/psemek/gfx/painter.hpp
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@ -59,6 +59,7 @@ namespace psemek::gfx
void line(geom::point<float, 2> const & p0, geom::point<float, 2> const & p1, float width, color const & c, bool smooth = true);
void line(geom::point<float, 2> const & p0, geom::point<float, 2> const & p1, float w0, float w1, color const & c0, color const & c1, bool smooth = true);
void besier(geom::point<float, 2> const & p0, geom::point<float, 2> const & p1, geom::point<float, 2> const & p2, float width, color const & c, int quality = 8, bool smooth = true);
void polygon(util::span<geom::point<float, 2> const> points, color const & c);
// 2D text
geom::vector<float, 2> text_size(std::string_view str, font f = font::font_9x12);

16
libs/gfx/source/painter.cpp
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@ -3,6 +3,7 @@
#include <psemek/gfx/mesh.hpp>
#include <psemek/gfx/texture.hpp>
#include <psemek/gfx/resource/font_9x12_png.hpp>
#include <psemek/cg/triangulation/ear_clipping.hpp>
#include <psemek/geom/constants.hpp>
#include <psemek/io/memory_stream.hpp>
#include <psemek/util/enum.hpp>
@ -282,6 +283,21 @@ namespace psemek::gfx
}
}
void painter::polygon(util::span<geom::point<float, 2> const> points, color const & c)
{
auto dcel = cg::ear_clipping<std::uint32_t>(points.begin(), points.end());
for (std::uint32_t i = 0; i < dcel.faces.size(); ++i)
{
auto e = dcel.face(i).edge();
auto p0 = points[e.origin().index()]; e = e.next();
auto p1 = points[e.origin().index()]; e = e.next();
auto p2 = points[e.origin().index()];
triangle(p0, p1, p2, c);
}
}
geom::vector<float, 2> painter::text_size(std::string_view str, font f)
{
// TODO: multiline text