Beispiel #1
0
        /// <summary>
        /// Orders an array of three ResultPoints in an order [A,B,C] such that AB &lt; AC and
        /// BC &lt; AC and the angle between BC and BA is less than 180 degrees.
        /// </summary>
        public static void orderBestPatterns(ResultPoint[] patterns)
        {
            // Find distances between pattern centers
            float zeroOneDistance = distance(patterns[0], patterns[1]);
            float oneTwoDistance  = distance(patterns[1], patterns[2]);
            float zeroTwoDistance = distance(patterns[0], patterns[2]);

            ResultPoint pointA, pointB, pointC;

            // Assume one closest to other two is B; A and C will just be guesses at first
            if (oneTwoDistance >= zeroOneDistance && oneTwoDistance >= zeroTwoDistance)
            {
                pointB = patterns[0];
                pointA = patterns[1];
                pointC = patterns[2];
            }
            else if (zeroTwoDistance >= oneTwoDistance && zeroTwoDistance >= zeroOneDistance)
            {
                pointB = patterns[1];
                pointA = patterns[0];
                pointC = patterns[2];
            }
            else
            {
                pointB = patterns[2];
                pointA = patterns[0];
                pointC = patterns[1];
            }

            // Use cross product to figure out whether A and C are correct or flipped.
            // This asks whether BC x BA has a positive z component, which is the arrangement
            // we want for A, B, C. If it's negative, then we've got it flipped around and
            // should swap A and C.
            if (crossProductZ(pointA, pointB, pointC) < 0.0f)
            {
                ResultPoint temp = pointA;
                pointA = pointC;
                pointC = temp;
            }

            patterns[0] = pointA;
            patterns[1] = pointB;
            patterns[2] = pointC;
        }
Beispiel #2
0
 /// <returns>
 /// distance between two points
 /// </returns>
 public static float distance(ResultPoint pattern1, ResultPoint pattern2)
 {
     return(MathUtils.distance(pattern1.x, pattern1.y, pattern2.x, pattern2.y));
 }