Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/Utils.java @ 4655:cd44d28d0fbc
Move the access to artifact data to the Access object
Use BedHeightAccess class to receive the data from the artifact. This abstracts
the data access from the actual artifact.
author | Björn Ricks <bjoern.ricks@intevation.de> |
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date | Tue, 11 Dec 2012 09:44:04 +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); } }