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/* * This work by W. Patrick Hooper <wphooper@gmail.com> is free of known copyright restrictions. * The work is in the public domain. * * Author's website: <a href="http://wphooper.com">http://wphooper.com</a>. */ package geometry; import number.Complex; /** * This class represents the choice of a line segment in the complex plane. * * This class is immutable. That is, once a LineSegment is constructed, it will * not change. * * @author W. Patrick Hooper */ public final class LineSegment { // The start and end point of the segment. private final Complex start, end; /** * Construct a new LineSegment from a start and an end. * * @param starting_point the starting point of the segment. * @param ending_point the ending point of the segment. segment. */ public LineSegment(Complex starting_point, Complex ending_point) { start = starting_point; end = ending_point; } /** * Construct the image of a line segment under a similarity */ public LineSegment(LineSegment seg, Similarity sim) { start = sim.map(seg.startingPoint()); end = sim.map(seg.endingPoint()); } /** * Return the starting point. */ public Complex startingPoint() { return start; } /** * Return the endpoint. */ public Complex endingPoint() { return end; } /** * Return the distance between the starting and ending points. */ public double length() { return endingPoint().minus(startingPoint()).abs(); } /** * Return the point midway between the starting and ending points. */ public Complex midpoint() { return endingPoint().add(startingPoint()).div(2); } }

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