distance between point and shape - Java java.lang

Java examples for java.lang:Math Geometry Distance

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Description

distance between point and shape

Demo Code


//package com.java2s;
import java.awt.Shape;
import java.awt.geom.Line2D;
import java.awt.geom.PathIterator;
import java.awt.geom.Point2D;

public class Main {
    public static double distance(final Point2D p, final Shape s,
            final double eps) {
        if (s.contains(p))
            return 0;
        final PathIterator pi = s.getPathIterator(null, eps);
        final Line2D line = new Line2D.Double();
        double bestDistSq = Double.POSITIVE_INFINITY;
        double firstX = Double.NaN;
        double firstY = Double.NaN;
        double lastX = Double.NaN;
        double lastY = Double.NaN;
        final double coords[] = new double[6];
        while (!pi.isDone()) {
            final boolean validLine;
            switch (pi.currentSegment(coords)) {
            case PathIterator.SEG_MOVETO:
                lastX = coords[0];/*from ww  w  .  j  a va2s.co  m*/
                lastY = coords[1];
                firstX = lastX;
                firstY = lastY;
                validLine = false;
                break;
            case PathIterator.SEG_LINETO: {
                final double x = coords[0];
                final double y = coords[1];
                line.setLine(lastX, lastY, x, y);
                lastX = x;
                lastY = y;
                validLine = true;
                break;
            }
            case PathIterator.SEG_CLOSE:
                line.setLine(lastX, lastY, firstX, firstY);
                validLine = true;
                break;
            default:
                throw new AssertionError();
            }
            if (validLine) {
                final double distSq = line.ptSegDistSq(p);
                if (distSq < bestDistSq) {
                    bestDistSq = distSq;
                }
            }
            pi.next();
        }
        return Math.sqrt(bestDistSq);
    }
}

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