64 lines
1.9 KiB
Java
64 lines
1.9 KiB
Java
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/**
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This class represents a 2D line segment using 2 points.
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@author Natalie Webber
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@author Scott Bateman
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@author Isaac Shoebottom (3429069)
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*/
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public class LineSegment {
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private CartesianPoint pointA;
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private CartesianPoint pointB;
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public LineSegment (double x1, double y1, double x2, double y2) {
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pointA = new CartesianPoint (x1, y1);
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pointB = new CartesianPoint (x2, y2);
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}
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public LineSegment (CartesianPoint p1, CartesianPoint p2) {
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pointA = p1;
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pointB = p2;
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}
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public double getLength () {
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return pointA.distance(pointB);
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}
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/**
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* This method checks the cross product and dot products of the line and the given point to check if the point p is on the segment
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* @param p The point that is being tested to be on the segment
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* @return Value of if the returned point is on the segment
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*/
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public Boolean containsPoint (CartesianPoint p) {
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double crossProduct;
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crossProduct = ((p.getY() - pointA.getY()) * (pointB.getX() - pointA.getX())) - ((p.getX() - pointA.getX()) * (pointB.getY() - pointA.getY()));
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if (Math.abs(crossProduct) > Math.ulp(1.0)) {
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return false;
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}
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double dotProduct;
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dotProduct = ((p.getX() - pointA.getX()) * (pointB.getX() - pointA.getX())) + ((p.getY() - pointA.getY()) * (pointB.getY() - pointA.getY()));
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if (dotProduct < 0 ) {
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return false;
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}
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double squaredLength;
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squaredLength = ((pointB.getX() - pointA.getX()) * (pointB.getX() - pointA.getX())) + ((pointB.getY() - pointA.getY()) * (pointB.getY() - pointA.getY()));
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if (dotProduct > squaredLength) {
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return false;
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}
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return true;
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}
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/**
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* Method to check if the line is vertical (only on one point in the x axis)
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* @return The value of is the line is vertical or not
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*/
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public boolean isVertical() {
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if (pointA.getX() == pointB.getX()) {
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return false;
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}
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else {
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return true;
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}
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}
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}
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