Line.cpp

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/*
   Copyright 2022 Rishi Challa
 
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at
 
       http://www.apache.org/licenses/LICENSE-2.0
 
   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
 
#include "Line.hpp"
 
#include <Kale/Math/Utils/Utils.hpp>
#include <Kale/Math/RotatedRect/RotatedRect.hpp>
#include <Kale/Math/Rect/Rect.hpp>
#include <Kale/Math/Ray/Ray.hpp>
#include <Kale/Math/Circle/Circle.hpp>
 
#include <stdexcept>
 
using namespace Kale;
 
Line::Line() : point1(0, 0), point2(0, 0) {
    // Empty Body
}
 
Line::Line(const Vector2f &point1, const Vector2f &point2) : point1(point1), point2(point2) {
    // Empty Body
}
 
Vector2f Line::getNormal() const {
    Vector2f tmp = point2 - point1;
    return tmp / tmp.magnitude();
}
 
bool Line::isPerpendicular(Ray ray) const {
    return ray.isPerpendicular(*this);
}
 
bool Line::isPerpendicular(Line line) const {
    return isFloating0((point2 - point1).dot(line.point2 - line.point1));
}
 
bool Line::isParallel(Ray ray) const {
    return ray.isParallel(*this);
}
 
bool Line::isParallel(Line line) const {
    return isFloating0((point2 - point1).cross(line.point2 - line.point1));
}
 
Rect Line::getBoundingBox() const {
    return {
        {std::min(point1.x, point2.x), std::max(point1.y, point2.y)},
        {std::max(point1.x, point2.x), std::min(point1.y, point2.y)}
    };
}
 
bool Line::pointCollision(Vector2f point) const {
    Vector2f p = point - point1;
    Vector2f p2 = point2 - point1;
    return isFloating0(p.cross(p2)) && p.dot(p2) > 0.0f && (point - point2).dot(point1 - point2) > 0.0f;
}
 
bool Line::rectCollision(RotatedRect rect) const {
    return pointCollision(rect.point1) || pointCollision(rect.point2) || pointCollision(rect.point3) || pointCollision(rect.point4) ||
        lineCollision({rect.point1, rect.point2}) || lineCollision({rect.point2, rect.point3}) ||
        lineCollision({rect.point3, rect.point4}) || lineCollision({rect.point4, rect.point1});
}
 
bool Line::rectCollision(Rect rect) const {
    return pointCollision(rect.topLeft) || pointCollision(rect.topRight()) || pointCollision(rect.bottomLeft()) || pointCollision(rect.bottomRight) ||
        lineCollision({rect.topLeft, rect.topRight()}) || lineCollision({rect.topRight(), rect.bottomRight}) ||
        lineCollision({rect.bottomRight, rect.bottomLeft()}) || lineCollision({rect.bottomLeft(), rect.topLeft});
}
 
bool Line::circleCollision(Circle circle) const {
    return circle.lineCollision(*this);
}
 
bool Line::rayCollision(Ray ray) const {
    return ray.lineCollision(*this);
}
 
bool Line::lineCollision(Line line) const {
    float l = (point1 - point2).cross(line.point1 - point2);
    float r = (point1 - point2).cross(line.point2 - point2);
    if ((l > 0 && r > 0) || (l < 0 && r < 0)) return false;
 
    // Two lines are parallel & on the same ray
    if (isFloating0(l) && isFloating0(r)) return point1.x >= line.point2.x && point2.x <= line.point1.x;
 
    float l2 = (line.point1 - line.point2).cross(point1 - line.point2);
    float r2 = (line.point1 - line.point2).cross(point2 - line.point2);
    if ((l2 > 0 && r2 > 0) || (l2 < 0 && r2 < 0)) return false;
 
    return true;
}