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"\t\t\tcoordIndex[currentIndex ] = currentIndex;", "\t\t\tcoordIndex[currentIndex + 1] = -1;", "\t\t}", "\t} else {", "\t\t// subsequent passes when tail is a constant length of maxPoints", "\t\t// and coordIndex consists of two polylines", "\t\tif ( currentIndex < maxPoints ) {", "\t\t\tcoordIndex[currentIndex] = currentIndex;", "\t\t\tcoordIndex[currentIndex + 1] = -1;", "\t\t} else {", "\t\t\t// occurs once each cycle when currentIndex == maxPoints", "\t\t\tcoordIndex[currentIndex ] = 0;", "\t\t\tcoordIndex[currentIndex + 1] = -1;", "\t\t\tcurrentIndex = 0;", "\t\t\tcoordIndex[currentIndex ] = currentIndex;", "\t\t\tcoordIndex[currentIndex + 1] = -1;", "\t\t}", "\t}", "", "\t// save last position and time to later compute direction and speed", "\tlast_position = position;", "\tposition = value;", "\tlast_time = current_time;", "\tcurrent_time = time;", "", "\t// add the new position to the coordinate array ring-buffer", "\tcoord[currentIndex] = position;", "\tposition_changed = position; \t// echo position value as an output", "", "", "\t", "\t// compute direction based on last two points passed in", "\tdirection = position.subtract(last_position);", "\tdistance = direction.length();", "", "\t// compute a new rotation only if there has been some finite movement", "\tif ( distance >= 0.00001 ) {", "\t\t\trotation = new SFRotation(initial_direction, direction);", "\t}", "", "\t// Compute speed and output results only if two or more points have been", "\t// passed in since initialization or last reset", "\tif ( pointCount >= 1 ) {", "", "\t\t// compute speed", "\t\tspeed = distance / (current_time - last_time);", "\t\trotation_changed = rotation;", "\t\tspeed_changed = speed;", "", "\t\t// outpout the coord and coordIndex arrays only when appropriate", "\t\tif (isVisible ) {", "\t\t\tcoord_changed = coord;", "\t\t\tcoordIndex_changed = coordIndex;", "\t\t} else {", "\t\t\tcoordIndex_changed = nullcoordIndex;", "\t\t}", "\t}", "", "\t// increment the appropriate 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