62 lines
1.2 KiB
C++
62 lines
1.2 KiB
C++
#pragma once
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#include "Point.h"
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class Line
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{
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private:
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Point m_from, m_to, m_to_from_origin;
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public:
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Line(Point from, Point to) : m_from(from), m_to(to), m_to_from_origin(to - from) {}
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Line() = default;
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Point from() const
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{
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return m_from;
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}
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Point to() const
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{
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return m_to;
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}
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void set_from(Point from)
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{
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m_from = from;
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}
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void set_to(Point to)
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{
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m_to = to;
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}
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// Return true if the given point is to the right of this line.
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// False is also returned if the point is directly on the line.
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bool is_point_right(Point other) const
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{
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other -= from();
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// Cross product greater than zero?
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if (m_to_from_origin.x() * other.y() - m_to_from_origin.y() * other.x() > 0)
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{
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return true;
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}
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else
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{
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return false;
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}
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}
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float distance_squared_to(Point other) const
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{
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float a = from().y() - to().y();
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float b = to().x() - from().x();
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float c = from().x() * to().y() - to().x() * from().y();
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float d = abs(a * other.x() + b * other.y() + c);
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return (d * d) / (a * a + b * b);
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}
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}; |