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LibGfx: Add Painter::fill_ellipse()

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Sergey Bugaev 2020-05-24 21:03:48 +03:00 • committed by Andreas Kling
parent 31359e3ad2
commit 8520d3a425
2 changed files with 20 additions and 0 deletions
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19
Libraries/LibGfx/Painter.cpp
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@ -232,6 +232,25 @@ void Painter::fill_rect_with_gradient(const Rect& a_rect, Color gradient_start,
return fill_rect_with_gradient(Orientation::Horizontal, a_rect, gradient_start, gradient_end);
}
void Painter::fill_ellipse(const Rect& a_rect, Color color)
{
auto rect = a_rect.translated(translation()).intersected(clip_rect());
if (rect.is_empty())
return;
ASSERT(m_target->rect().contains(rect));
RGBA32* dst = m_target->scanline(rect.top()) + rect.left() + rect.width() / 2;
const size_t dst_skip = m_target->pitch() / sizeof(RGBA32);
for (int i = 0; i < rect.height(); i++) {
double y = rect.height() * 0.5 - i;
double x = rect.width() * sqrt(0.25 - y * y / rect.height() / rect.height());
fast_u32_fill(dst - (int)x, color.value(), 2 * (int)x);
dst += dst_skip;
}
}
void Painter::draw_ellipse_intersecting(const Rect& rect, Color color, int thickness)
{
constexpr int number_samples = 100; // FIXME: dynamically work out the number of samples based upon the rect size