Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/Utils.java @ 4496:d8992459b408
Add method to return the facets of an artifact
This methos should be used to get the facets of an artifact instead of accessing
the facets member variable directly.
author | Björn Ricks <bjoern.ricks@intevation.de> |
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date | Wed, 14 Nov 2012 11:11:04 +0100 |
parents | 5cc9453456a7 |
children | b195fede1c3b |
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package de.intevation.flys.artifacts.math; public final class Utils { public static final double EPSILON = 1e-3; private Utils() { } public static final boolean epsilonEquals(double a, double b) { return epsilonEquals(a, b, EPSILON); } public static final boolean epsilonEquals(double a, double b, double eps) { return Math.abs(a - b) < eps; } public static int relativeCCW( double x1, double y1, double x2, double y2, double px, double py ) { if ((epsilonEquals(x1, x2) && epsilonEquals(y1, y2)) || ((epsilonEquals(x1, px) && epsilonEquals(y1, py)))) { return 0; // Coincident points. } // Translate to the origin. x2 -= x1; y2 -= y1; px -= x1; py -= y1; double slope2 = y2 / x2; double slopep = py / px; if (epsilonEquals(slope2, slopep) || (epsilonEquals(x2, 0.0) && epsilonEquals(px, 0.0))) { return y2 > EPSILON // Colinear. ? (py < -EPSILON ? -1 : py > y2 ? 1 : 0) : (py > -EPSILON ? -1 : py < y2 ? 1 : 0); } if (x2 >= EPSILON && slope2 >= EPSILON) { return px >= EPSILON // Quadrant 1. ? (slope2 > slopep ? 1 : -1) : (slope2 < slopep ? 1 : -1); } if (y2 > EPSILON) { return px < -EPSILON // Quadrant 2. ? (slope2 > slopep ? 1 : -1) : (slope2 < slopep ? 1 : -1); } if (slope2 >= EPSILON) { return px >= EPSILON // Quadrant 3. ? (slope2 < slopep ? 1 : -1) : (slope2 > slopep ? 1 : -1); } return px < -EPSILON // Quadrant 4. ? (slope2 < slopep ? 1 : -1) : (slope2 > slopep ? 1 : -1); } }