import com.badlogic.gdx.math.GeometryUtils; //导入依赖的package包/类
/**
 * Calculate the centroid of a polygon defined by its vertices
 * @param vertices Array of polygon vertices
 * @return Vector2 containing x and y coordinates of the centroid
 */
private Vector2 calculatePolygonCentroid(float[] vertices) {
    Vector2 polygonCentroid = new Vector2();

    GeometryUtils.polygonCentroid(vertices, 0, vertices.length, polygonCentroid);
    return polygonCentroid;
}
 

import com.badlogic.gdx.math.GeometryUtils; //导入依赖的package包/类
public TrapOriginator(TrapLocation trapLocation, float[] vertices) {
	this(trapLocation.getInternalId(), trapLocation.getTrap().getType().getName(), trapLocation.getMap(), trapLocation);
	isTrapLocation = true;
	Vector2 polygonCenter = GeometryUtils.polygonCentroid(vertices, 0, vertices.length, MathUtil.getVector2());
	position().set(polygonCenter);
	MathUtil.freeVector2(polygonCenter);
}
 

import com.badlogic.gdx.math.GeometryUtils; //导入依赖的package包/类
static public void ensureClockWise (float[] polygon, int offset, int count) {
	if (GeometryUtils.isClockwise(polygon, offset, count)) return;
	int lastX = offset + count - 2;
	for (int i = offset, n = offset + count / 2; i < n; i += 2) {
		int other = lastX - i;
		float x = polygon[i];
		float y = polygon[i + 1];
		polygon[i] = polygon[other];
		polygon[i + 1] = polygon[other + 1];
		polygon[other] = x;
		polygon[other + 1] = y;
	}
}
 

import com.badlogic.gdx.math.GeometryUtils; //导入依赖的package包/类
@Override
public float getCenterX() {
	if(centroidDirty) {
		GeometryUtils.polygonCentroid(vertices, 0, vertices.length, centroid);
		centroidDirty = false;
	}
	return centroid.x;
}
 

import com.badlogic.gdx.math.GeometryUtils; //导入依赖的package包/类
@Override
public float getCenterY() {
	if(centroidDirty) {
		GeometryUtils.polygonCentroid(vertices, 0, vertices.length, centroid);
		centroidDirty = false;
	}
	return centroid.y;
}