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1f346a490b
Previously this was limited to integer triangles, but I want to use it with floats, so let's start by templatizing the class.
61 lines
1.3 KiB
C++
61 lines
1.3 KiB
C++
/*
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* Copyright (c) 2020, Shannon Booth <shannon.ml.booth@gmail.com>
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* Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Forward.h>
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#include <LibGfx/Point.h>
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namespace Gfx {
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template<typename T>
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class Triangle {
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public:
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Triangle(Point<T> a, Point<T> b, Point<T> c)
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: m_a(a)
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, m_b(b)
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, m_c(c)
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{
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m_determinant = (m_b.x() - m_a.x()) * (m_c.y() - m_a.y()) - (m_b.y() - m_a.y()) * (m_c.x() - m_a.x());
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}
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Point<T> a() const { return m_a; }
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Point<T> b() const { return m_b; }
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Point<T> c() const { return m_c; }
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bool contains(Point<T> p) const
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{
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auto x = p.x();
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auto y = p.y();
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auto ax = m_a.x();
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auto bx = m_b.x();
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auto cx = m_c.x();
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auto ay = m_a.y();
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auto by = m_b.y();
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auto cy = m_c.y();
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if (m_determinant * ((bx - ax) * (y - ay) - (by - ay) * (x - ax)) <= 0)
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return false;
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if (m_determinant * ((cx - bx) * (y - by) - (cy - by) * (x - bx)) <= 0)
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return false;
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if (m_determinant * ((ax - cx) * (y - cy) - (ay - cy) * (x - cx)) <= 0)
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return false;
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return true;
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}
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String to_string() const;
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private:
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T m_determinant { 0 };
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Point<T> m_a;
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Point<T> m_b;
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Point<T> m_c;
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};
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}
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