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Merge pull request #664 from Gustl22/geometry_utils

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GeometryUtils: Fix reverse clockwise check
This commit is contained in:
Emux
2019-02-19 13:31:23 +02:00
committed by GitHub
parent 7c2976819f 16132f7ae3
commit f6af3d7410
2 changed files with 47 additions and 13 deletions
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15
vtm/src/org/oscim/utils/geom/GeometryUtils.java
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@@ -322,9 +322,9 @@ public final class GeometryUtils {
public static float isClockwise(float[] points, int n) {
float area = 0f;
for (int i = 0; i < n - 2; i += 2) {
area += (points[i] * points[i + 3]) - (points[i + 1] * points[i + 2]);
area += (points[i + 1] * points[i + 2]) - (points[i] * points[i + 3]);
}
area += (points[n - 2] * points[1]) - (points[n - 1] * points[0]);
area += (points[n - 1] * points[0]) - (points[n - 2] * points[1]);
return 0.5f * area;
}
@@ -418,15 +418,4 @@ public final class GeometryUtils {
}
return scaled;
}
public static void main(String[] args) {
float[] p = {-1, 0, 0, 0, 0, 0};
for (int i = 0; i < 9; i++) {
p[4] = (float) Math.cos(Math.toRadians(i * 45));
p[5] = (float) Math.sin(Math.toRadians(i * 45));
System.out.println("\n> " + (i * 45) + " " + p[3] + ":" + p[4] + "\n="
+ dotProduct(p, 0, 2, 4));
}
}
}