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add GeometryUtils.area() for arrays

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This commit is contained in:
Hannes Janetzek 2014-01-22 22:57:16 +01:00
parent f2a140e414
commit fa2d3dd7a4
1 changed files with 13 additions and 2 deletions
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15
vtm/src/org/oscim/utils/GeometryUtils.java
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@ -62,7 +62,18 @@ public final class GeometryUtils {
} }
public static float area(float ax, float ay, float bx, float by, float cx, float cy) { public static float area(float ax, float ay, float bx, float by, float cx, float cy) {
float area = ((ax - cx) * (by - cy) - (bx - cx) * (ay - cy)) * 0.5f;
return area < 0 ? -area : area; float area = ((ax - cx) * (by - cy)
- (bx - cx) * (ay - cy));
return (area < 0 ? -area : area) * 0.5f;
}
public static float area(float[] a, int p1, int p2, int p3) {
float area = ((a[p1] - a[p3]) * (a[p2 + 1] - a[p3 + 1])
- (a[p2] - a[p3]) * (a[p1 + 1] - a[p3 + 1]));
return (area < 0 ? -area : area) * 0.5f;
} }
} }