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Support drawing quadratic besier lines in gfx::painter

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This commit is contained in:
Nikita Lisitsa 2021-06-13 14:14:37 +03:00
parent ebda20ff9c
commit 4ab4788eca
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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@ -57,6 +57,7 @@ namespace psemek::gfx
void rect(geom::box<float, 2> const & box, color const & c);
void circle(geom::point<float, 2> const & center, float radius, color const & c, int quality = 24);
void line(geom::point<float, 2> const & p0, geom::point<float, 2> const & p1, float width, color const & c, 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);
// 2D text
geom::vector<float, 2> text_size(std::string_view str, font f = font::font_9x12, float scale = 1.f);

16
libs/gfx/source/painter.cpp
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@ -264,6 +264,22 @@ namespace psemek::gfx
}
}
void painter::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, bool smooth)
{
auto at = [&](float t)
{
return p0 + (2.f * t) * (p1 - p0) + (t * t) * ((p2 - p1) + (p0 - p1));
};
for (int i = 0; i < quality; ++i)
{
float t0 = (i * 1.f) / quality;
float t1 = ((i + 1) * 1.f) / quality;
line(at(t0), at(t1), width, c, smooth);
}
}
geom::vector<float, 2> painter::text_size(std::string_view str, font f, float scale)
{
// TODO: multiline text