Method ClosestPointPointLine

Source/Engine/Core/Math/CollisionsHelper.cpp:12–42

#include "BoundingFrustum.h"

void CollisionsHelper::ClosestPointPointLine(const Float2& point, const Float2& p0, const Float2& p1, Float2& result)
{
    const Float2 p = point - p0;
    Float2 n = p1 - p0;

    const float length = n.Length();
    if (length < 1e-10f)
    {
        // Both points are the same, just give any
        result = p0;
        return;
    }
    n /= length;

    const float dot = Float2::Dot(n, p);
    if (dot <= 0.0f)
    {
        // Before first point
        result = p0;
    }
    else if (dot >= length)
    {
        // After first point
        result = p1;
    }
    else
    {
        // Inside
        result = p0 + n * dot;
    }
}

Float2 CollisionsHelper::ClosestPointPointLine(const Float2& point, const Float2& p0, const Float2& p1)
{