/** * filters out nonessential points. A point is nonessential if it affects the path taken by less * than 5 meters * * @return The checkpoints of the trail in this map */ public TTLocation[] getCheckpoints() { // starting point always relevant// ArrayList<TTLocation> checkpointList = new ArrayList<TTLocation>(); checkpointList.add(locations[0]); int relevantPointIndex = 0; for (int locationIndex = 2; locationIndex < locations.length; locationIndex++) { TTLocation ptInQuestion = locations[locationIndex - 1]; TTLocation relevantPt = locations[relevantPointIndex]; // distance from the last relevant to the point in question// float distanceTo = relevantPt.distanceTo(ptInQuestion.getLongitude(), ptInQuestion.getLatitude()); // if the point is less than 5m away, it can't affect the trail by more than 5m// if (distanceTo < 5) { continue; } // difference between the bearing from the relevant point to the point in question // and the bearing from the relevant point to the point after the point in question float bearingDifference = Math.abs( relevantPt.bearingTo(ptInQuestion.getLongitude(), ptInQuestion.getLatitude()) - relevantPt.bearingTo( locations[locationIndex].getLongitude(), locations[locationIndex].getLatitude())); // distance away from the point in question that the new path will take// double distanceOff = Math.sin(bearingDifference) * distanceTo; if (distanceOff > 5) { checkpointList.add(ptInQuestion); relevantPointIndex = locationIndex - 1; } } // the last point is always relevant and, as a result of the loop conditions, // never added by the loop// checkpointList.add(locations[locations.length - 1]); TTLocation[] array = new TTLocation[checkpointList.size()]; return checkpointList.toArray(array); }
/** * Convenience method for adding appending a location's information to a StringBuilder for use in * a KML export * * @param stopsSB StringBuilder to which to append the location info * @param loc TTLocation from which to get info */ private void appendLocationString(StringBuilder stopsSB, TTLocation loc) { stopsSB .append(loc.getLongitude()) .append(",") .append(loc.getLatitude()) .append(",") .append(loc.getAccuracy()) .append(",") .append(loc.getAltitude()) .append(",") .append(loc.getAccuracy()) .append(",") .append(loc.getSpeed()) .append(",") .append(loc.getTime()) .append(",") .append(loc.getTime() / 1000) .append(",") .append(loc.getDistance()) .append(";") .append("\n"); }