78 lines
2.1 KiB
Java
78 lines
2.1 KiB
Java
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/*
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* This file is part of Player Analytics (Plan).
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*
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* Plan is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License v3 as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Plan is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Plan. If not, see <https://www.gnu.org/licenses/>.
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*/
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package com.djrapitops.plan.delivery.rendering.json.graphs.line;
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/**
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* This math object is used in Ramer–Douglas–Peucker algorithm.
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*
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* https://en.wikipedia.org/wiki/Ramer%E2%80%93Douglas%E2%80%93Peucker_algorithm
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*
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* @author Rsl1122
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*/
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public class Line {
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private final Point start;
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private final Point end;
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private final double slope;
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private final double c;
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private final double crossPoint;
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public Line(Point one, Point two) {
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start = one;
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end = two;
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double x1 = one.getX();
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double x2 = two.getX();
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double y1 = one.getY();
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double y2 = two.getY();
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slope = (y2 - y1) / (x2 - x1);
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c = y1 - slope * x1;
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crossPoint = c / slope;
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}
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public double getA() {
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return getSlope();
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}
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public double getSlope() {
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return slope;
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}
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public double getC() {
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return c;
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}
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public double getCrossPoint() {
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return crossPoint;
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}
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public double getLength() {
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double x1 = start.getX();
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double x2 = end.getX();
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double y1 = start.getY();
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double y2 = end.getY();
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return Math.sqrt(Math.pow(x2 - x1, 2) + (Math.pow(y2 - y1, 2)));
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}
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public double getPerpendicularDistance(Point from) {
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double a = getA();
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double x = from.getX();
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double y = from.getY();
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return Math.abs(a * x - y + c) / Math.sqrt(Math.pow(a, 2) + 1);
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}
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}
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