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add point-in-poly function

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This commit is contained in:
Hannes Janetzek 2013-02-14 01:59:47 +01:00
parent 7b87e8fdc1
commit 9fba1e21b8
1 changed files with 15 additions and 0 deletions
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15
src/org/oscim/utils/GeometryUtils.java
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@ -315,4 +315,19 @@ public final class GeometryUtils {
return Math.toDegrees(BCA); return Math.toDegrees(BCA);
} }
// from www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/pnpoly.html
public static boolean pointInPoly(int nvert, float[] vert, float testx, float testy) {
int i, j;
boolean inside = false;
for (i = 0, j = (nvert - 1) * 2; i < nvert * 2; j = i++) {
if (((vert[i * 2 + 1] > testy) != (vert[j * j + 1] > testy)) &&
(testx < (vert[j * 2] - vert[i * 2])
* (testy - vert[i * 2 + 1])
/ (vert[j * 2 + 1] - vert[i * 2 + 1]) + vert[i * 2]))
inside = !inside;
}
return inside;
}
} }