问题描述
我正在制作导航应用程序，并跟踪用户在已绘制的GMSPolyline上的当前动作。它在用户直行时效果很好。现在如果假设在GMSPolyline上有右转/左转或掉头，现在按照我的GPS位置，我会在转弯前拿到一个20米左右的更新，而在30米后转向另一个。
我的GPS无法收集即将出现在转折点的点。在这种情况下，我的GMSMarker从点x跳到y，如果我应用动画，则它会沿着对角线移动，并且不会沿着GMSPolyline弧线或曲线移动。
请向我建议如何从GMSPolyline收集那些缺失的点或显示GMS标记的某些动画，以便用户可以看到他实际上正在打开折线。
我附上了一张样本图片。红线可以理解为GMSPolylines，蓝点是我用CLLocation Manager收到的GPS坐标。
p>
//当在GMSMapView上绘制折线时
GMSPath * path = [GMSPath pathFromEncodedPath ：strEncodedPolyline]; //解码编码的折线字符串以转换为位置。
//将所有路径点捕获到全局数组中，以便我们可以跟踪用户稍后旅行的方式。
arrLocationsOnPolyline = [NSMutableArray new]; //在为
填充（int counter = 0; counter< path.count; ++ counter）
{
CLLocationCoordinate2D coordinate = [path coordinateAtIndex：counter];
CLLocation * locTemp = [[CLLocation alloc] initWithLatitude：coordinate.latitude longitude：coordinate.longitude];
[arrLocationsOnPolyline addObject：locTemp];
}
//这里，循环结束后，我们将获取所有路径点作为位置到arrLocationsOnPolyline
//现在位于-locationManager：didUpdateLocations：委托方法
// 1.在arrLocationsOnPolyline中查找用户当前位置的最近路径点的索引，让我们将其称为nFoundAtIndexTemp。
// FMI：循环遍历arrLocationsOnPolyline并找到最近点的用户当前位置的索引，
//保存全局nLastFoundAtIndex变量并将其默认值设置为-1（in -viewDidLoad或者某处），
// 2.如果（nLastFoundAtIndex> = 0&&n; nFoundAtIndexTemp>（nLastFoundAtIndex + 10））//检查
//（意味着应用程序没有收到位置更新，但用户实际上是在多段线上绘制超过10点）
{
// 3. Hurray，你得到了他，现在从当前存储的最近路径点索引和当前最近点路径点索引arrLocationsOnPolyline
}
// 4.用当前状态更新nLastFoundAtIndex
nLastFoundAtIndex = nFoundAtIndexTemp;
//代码通过错过的点为用户位置标记添加动画
//使用用户错过的数组调用此函数（可能来自-locationManager：didUpdateLocations :)，标记将通过点。
#pragma mark - 通过错过的坐标进行动画制作
- （void）animateMarker：（GMSMarker *）markerUserLocation throughTheMissedLocations：（NSMutableArray< CLLocation *> *）arrMissedLocations
{
@try
{
CLLocation * locTemp = arrMissedLocations.firstObject;
if（locTemp）
{
[CATransaction begin];
NSTimeInterval nAnimationDuration = 0.1; //根据你的需要更新这个值。
[CATransaction setAnimationDuration：nAnimationDuration];
markerUserLocation.position = locTemp.coordinate;
if（arrMissedLocations.count> = 1）
{
@try
{
[CATransaction setCompletionBlock：^
{
@try
{
[arrMissedLocations removeObject：locTemp];
[self animateMarker：markerUserLocation throughTheMissedLocations：arrMissedLocations];
}
@catch（NSException * exception）
{
NSLog（@％s function％@处的异常，__ PRETTY_FUNCTION __，exception.debugDescription）;
}
}];
}
@catch（NSException * exception）
{
NSLog（@％s function％@处的异常，__ PRETTY_FUNCTION __，exception.debugDescription）;
}
}
[CATransaction commit];
{
}
@catch（NSException * exception）
{
NSLog（@％s function％@处的异常，__ PRETTY_FUNCTION __，exception.debugDescription）;
$ b $ p
$ b我们之前做过，但是不能发布代码，但希望你会得到一个设计水平的想法。
希望有帮助。
I am working on a navigation app and tracking user's current movement on an already drawn GMSPolyline. It works good when the user is going straight. Now if, suppose there is right / left turn or a u-turn on the GMSPolyline, now as per my GPS location I get one update around 20 meters before taking a turn and another after 30 meters.
My GPS fails to collect the points that will exist just at the turning point. In this case my GMSMarker jumps from point x to y and if I apply animation then it moves diagonally and does not move along the GMSPolyline arcs or curves. Please suggest me how can I collect those missing points from GMSPolyline or show some animation for GMS marker so that user can see he is actually turning on the polyline.
I am attaching one sample image. Red lines can be understood as GMSPolylines and blue dots are the GPS coordinates that I receive with CLLocation Manager.
解决方案// While drawing polyline on GMSMapView GMSPath *path = [GMSPath pathFromEncodedPath:strEncodedPolyline]; // Decoding encoded polyline string for converting to locations. // Capture all path points in to a global array,So that we can track how user is travelling later. arrLocationsOnPolyline = [NSMutableArray new]; // Make it fresh before filling for (int counter = 0; counter < path.count; ++counter) { CLLocationCoordinate2D coordinate = [path coordinateAtIndex:counter]; CLLocation *locTemp = [[CLLocation alloc] initWithLatitude:coordinate.latitude longitude:coordinate.longitude]; [arrLocationsOnPolyline addObject:locTemp]; } // Here,After loop ending, we'll get all path points as locations in to arrLocationsOnPolyline // Now in -locationManager:didUpdateLocations: delegate method, // 1. Find the index of nearest path point to user's current location in arrLocationsOnPolyline,Lets call it as nFoundAtIndexTemp. // FMI : loop through the arrLocationsOnPolyline and find the nearest point's index to user's current location, // Hold a global nLastFoundAtIndex variable and make it's default value as -1(in -viewDidLoad or somewhere), // 2. Check if (nLastFoundAtIndex >= 0 && nFoundAtIndexTemp > (nLastFoundAtIndex + 10)) // (Means app didn't received location updates but user actually traveled through more than 10 points on poyline drawn) { // 3. Hurray,You got him,Now animate your blue current location marker from the location at last stored nearest path point index and current nearest path point index of arrLocationsOnPolyline } // 4. Update nLastFoundAtIndex with current state nLastFoundAtIndex = nFoundAtIndexTemp; // Code To Animate user location marker through the missed points // Call this function with array of user missed points(Probably from -locationManager:didUpdateLocations:),Marker will be animated through the points. #pragma mark - Animating through the missed coordinates -(void)animateMarker:(GMSMarker *)markerUserLocation throughTheMissedLocations:(NSMutableArray <CLLocation *> *)arrMissedLocations { @try { CLLocation *locTemp = arrMissedLocations.firstObject; if(locTemp) { [CATransaction begin]; NSTimeInterval nAnimationDuration = 0.1; // Update this value as per your needs. [CATransaction setAnimationDuration:nAnimationDuration]; markerUserLocation.position = locTemp.coordinate; if(arrMissedLocations.count >= 1) { @try { [CATransaction setCompletionBlock:^ { @try { [arrMissedLocations removeObject:locTemp]; [self animateMarker:markerUserLocation throughTheMissedLocations:arrMissedLocations]; } @catch (NSException *exception) { NSLog(@"exception at %s function %@",__PRETTY_FUNCTION__,exception.debugDescription); } }]; } @catch (NSException *exception) { NSLog(@"exception at %s function %@",__PRETTY_FUNCTION__,exception.debugDescription); } } [CATransaction commit]; } } @catch (NSException *exception) { NSLog(@"exception at %s function %@",__PRETTY_FUNCTION__,exception.debugDescription); } }We did this earlier,But can't post code, But hopefully you'll get a design level idea.
Hope that helps.
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