Distance.cpp

//
// Created by Ryan.Zurrin001 on 12/16/2021.
//
#include "Distance.h"

float rez::distance(Point3d& A, Point3d& B, Point3d& C)
{
    Vector3f AB = B - A;	//direction vector of line
    Vector3f CA = A - C;
    Vector3f cross = crossProduct3d(CA, AB);

    float mag_cross = cross.magnitude();
    float mag_dir = AB.magnitude();

    float distance = mag_cross / mag_dir;
    return distance;
}

float rez::distance(Line& line, Point3d& C)
{
    // TODO we can simple call distance frunction which takes three points here as well.
    // But then the methodology of finding the distance is not visible to students. So keep this.
    // Ignor the fact that we duplicate the similar implementation, which is not the best practise.
    Vector3f AC = C - line.point();
    auto t = dotProduct(line.direction(), AC);

    auto xt = line.point() + line.direction() * t;
    auto dist_vec = xt - C;

    return dist_vec.magnitude();
}

float rez::distance(Line2d& line, Point2d& C)
{
    return 0.0;
}

float rez::distance(Point3d& p1, Point3d& p2)
{
    float dx = p1[X_] - p2[X_];
    float dy = p1[Y_] - p2[Y_];
    float dz = p1[Z_] - p2[Z_];

    float distance = sqrt(pow(dx, 2) + pow(dy, 2) + pow(dz, 2));
    return distance;
}

float rez::distance(Point2d& p1, Point2d& p2)
{
    float dx = p1[X_] - p2[X_];
    float dy = p1[Y_] - p2[Y_];
    float distance = sqrt(pow(dx, 2) + pow(dy, 2));
    return distance;
}

float rez::distance(Planef& p, Point3d& Q)
{
    auto result = dotProduct(p.getNormal(), Q) - p.getD();
    return result;
}