android - 计算 android.graphics.path 值的质心，并找到质心相对于路径的位置

Question

如果我有一个ArrayList值Path，我如何计算由创建的Path值生成的图形的质心？然后，我怎样才能找到质心相对于Path. 需要指导或帮助。谢谢！:-)

Answer 1

也许这对你有一点帮助（来自 Android 资源 C:\adt-bundle-windows\sdk\sources\android-17\android\gesture\GestureUtils.java）：

/**
 * Calculates the centroid of a set of points.
 * 
 * @param points the points in the form of [x1, y1, x2, y2, ..., xn, yn]
 * @return the centroid
 */
static float[] computeCentroid(float[] points) {
    float centerX = 0;
    float centerY = 0;
    int count = points.length;
    for (int i = 0; i < count; i++) {
        centerX += points[i];
        i++;
        centerY += points[i];
    }
    float[] center = new float[2];
    center[0] = 2 * centerX / count;
    center[1] = 2 * centerY / count;

    return center;
}