在iPhone MapView中，绘制路线部分未获得所需的输出 [英] Drawing route partially not getting required output in iPhone MapView
问题描述
我正在尝试使用多段线在两点之间绘制路线。我有些路线，但不正确，我认为它会在转弯时感到困惑。
- （IBAction）onclickDrawButton：这是我使用google api获取路线的点数。以下是代码我试过的请检查。 （id）发送者
{
flag = TRUE;
NSString * startpoint = [satrtTextfield text];
NSString * endpoint = [endTextfield text];
NSMutableString * urlString = [NSMutableString stringWithFormat：@http://maps.googleapis.com/maps/api/directions/json?origin=%@&destination=%@&sensor=假时，起始点，终点]。
NSURL * url = [NSURL URLWithString：urlString];
NSURLRequest * request = [[NSURLRequest alloc] initWithURL：url];
NSURLConnection * connection = [[NSURLConnection alloc] initWithRequest：request
delegate：self];
if（connection）
{
NSLog（@connectin done）;
}
}
<$ p （NSURLConnection *）连接didReceiveResponse：（NSURLResponse *）响应
{
if（flag）
{
recievedRoutes = [[NSMutableData alloc] init];
$ b
- （void）connectionDidFinishLoading：（NSURLConnection *）连接
{
if（flag）{
NSString * jsonResult = [[NSString alloc ] initWithData：recievedRoutes encoding：NSUTF8StringEncoding];
NSLog（@json response％@，jsonResult）;
NSDictionary * partialJsonDict = [jsonResult JSONValue];
NSArray * items = [partialJsonDict valueForKey：@routes];
$ b $ // NSLog（@responsed valued％@，[[items objectAtIndex：0] valueForKey：@legs]）;
NSArray * aary = [[items objectAtIndex：0] valueForKey：@legs];
NSLog（@legs array wuth polyline％@，[[aary objectAtIndex：0] valueForKey：@steps]）;
NSArray * steps = [[aary objectAtIndex：0] valueForKey：@steps];
NSLog（@steps％@，[[steps objectAtIndex：1] objectForKey：@polyline]）;
NSMutableString * string = [[NSMutableString alloc] init];
for（int i = 0; i< [steps count]; i ++）
{
// NSLog（@steps i value％@，[[[steps objectAtIndex：i] objectForKey：@ 折线] objectForKey：@ sttpoints]）;
[string appendString：[[[steps [objectAtIndex：i] objectForKey：@polyline] objectForKey：@points]];
}
NSLog（@final％@，string）;
MKPolyline * polyline = [self polylineWithEncodedString：string];
[mapView addOverlay：polyline];
[self zoomToFitMapAnnotations：mapView];
$ - （void）connection：（NSURLConnection *）connection didReceiveData：（NSData *）data
{
if（flag）{
[recievedRoutes appendData：data];
}
}
/ /解码折线和回收协调我已经使用下面的方法
pre $ - （MKPolyline *）polylineWithEncodedString：（NSString *）encodedString {
const char * bytes = [encodedString UTF8String];
NSUInteger length = [encodedString lengthOfBytesUsingEncoding：NSUTF8StringEncoding];
NSUInteger idx = 0;
NSUInteger count = length / 4;
CLLocationCoordinate2D * coords = calloc（count，sizeof（CLLocationCoordinate2D））;
NSUInteger coordIdx = 0;
float latitude = 0;
float longitude = 0;
while（idx< length）{
char byte = 0;
int res = 0;
char shift = 0;
do {
byte = bytes [idx ++] - 63;
res | =（byte& 0x1F）<<转移;
shift + = 5;
} while（byte> = 0x20）; （res& 1）？〜（res>> 1）：（res>> 1））;
float deltaLat =
latitude + = deltaLat;
shift = 0;
res = 0;
do {
byte = bytes [idx ++] - 0x3F;
res | =（byte& 0x1F）<<转移;
shift + = 5;
} while（byte> = 0x20）; （res& 1）？〜（res>> 1）：（res>> 1））;
float deltaLon =
longitude + = deltaLon;
float finalLat =纬度* 1E-5;
float finalLon = longitude * 1E-5;
CLLocationCoordinate2D coord = CLLocationCoordinate2DMake（finalLat，finalLon）;
coords [coordIdx ++] = coord;
NSLog（@in encoding％f％f，纬度，经度）;
if（coordIdx == count）{
NSUInteger newCount = count + 10;
coords = realloc（coords，newCount * sizeof（CLLocationCoordinate2D））;
count = newCount;
}
}
MKPolyline * polyline = [MKPolyline polylineWithCoordinates：coords count：coordIdx];
free（coords）;
返回折线;
}
//绘制实际路线
- （MKOverlayView *）mapView：（MKMapView *）mapView
viewForOverlay：（id< MKOverlay>）overlay {
MKPolylineView * overlayView = [[ MKPolylineView alloc] initWithOverlay：overlay];
overlayView.lineWidth = 2;
overlayView.strokeColor = [UIColor purpleColor];
overlayView.fillColor = [[UIColor purpleColor] colorWithAlphaComponent：0.1f];
返回overlayView;
}
p>
NSArray * steps = [[aary objectAtIndex：0] valueForKey：@steps];
用这行代替行可能有用
NSMutableArray * polyLinesArray = [[NSMutableArray alloc] init];
for（int i = 0; i< [steps count]; i ++）
{
NSString * encodedPoints = [[[steps [objectAtIndex：i] objectForKey：@折线] valueForKey：@points];
MKPolyline * route = [self polylineWithEncodedString：encodedPoints];
[polyLinesArray addObject：route];
}
[self.mapView addOverlays：polyLinesArray];;
[polyLinesArray release];
I am trying to draw route between two points using polyline . I got somewhat route but not correct and I think it will get confused at the turn . I am using google api for getting points of route .Following is code what i tried please check .
- (IBAction)onclickDrawButton:(id)sender
{
flag=TRUE;
NSString *startpoint=[satrtTextfield text];
NSString *endpoint=[endTextfield text];
NSMutableString *urlString=[NSMutableString stringWithFormat:@"http://maps.googleapis.com/maps/api/directions/json?origin=%@&destination=%@&sensor=false",startpoint,endpoint];
NSURL *url = [NSURL URLWithString:urlString];
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request
delegate:self];
if(connection)
{
NSLog(@"connectin done");
}
}
-(void)connection:(NSURLConnection*)connection didReceiveResponse: (NSURLResponse*)response
{
if(flag)
{
recievedRoutes=[[NSMutableData alloc]init];
}
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
if(flag){
NSString *jsonResult = [[NSString alloc] initWithData:recievedRoutes encoding:NSUTF8StringEncoding];
NSLog(@"json response %@",jsonResult);
NSDictionary *partialJsonDict=[jsonResult JSONValue];
NSArray *items=[partialJsonDict valueForKey:@"routes"];
//NSLog(@"responsed valued %@",[[items objectAtIndex:0]valueForKey:@"legs"]);
NSArray *aary=[[items objectAtIndex:0]valueForKey:@"legs"];
NSLog(@"legs array wuth polyline %@",[[aary objectAtIndex:0]valueForKey:@"steps"]);
NSArray *steps=[[aary objectAtIndex:0]valueForKey:@"steps"];
NSLog(@"steps %@",[[steps objectAtIndex:1]objectForKey:@"polyline"]);
NSMutableString *string=[[NSMutableString alloc]init];
for(int i=0;i<[steps count];i++)
{
//NSLog(@"steps i value %@",[[[steps objectAtIndex:i]objectForKey:@"polyline"]objectForKey:@"sttpoints"]);
[string appendString:[[[steps objectAtIndex:i]objectForKey:@"polyline"]objectForKey:@"points"]];
}
NSLog(@"final %@",string);
MKPolyline *polyline=[self polylineWithEncodedString:string];
[mapView addOverlay:polyline];
[self zoomToFitMapAnnotations:mapView];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
if(flag){
[recievedRoutes appendData:data];
}
}
//to decode polyline and retrives coordintes i have used following method
-(MKPolyline *)polylineWithEncodedString:(NSString *)encodedString {
const char *bytes = [encodedString UTF8String];
NSUInteger length = [encodedString lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
NSUInteger idx = 0;
NSUInteger count = length / 4;
CLLocationCoordinate2D *coords = calloc(count, sizeof(CLLocationCoordinate2D));
NSUInteger coordIdx = 0;
float latitude = 0;
float longitude = 0;
while (idx < length) {
char byte = 0;
int res = 0;
char shift = 0;
do {
byte = bytes[idx++] - 63;
res |= (byte & 0x1F) << shift;
shift += 5;
} while (byte >= 0x20);
float deltaLat = ((res & 1) ? ~(res >> 1) : (res >> 1));
latitude += deltaLat;
shift = 0;
res = 0;
do {
byte = bytes[idx++] - 0x3F;
res |= (byte & 0x1F) << shift;
shift += 5;
} while (byte >= 0x20);
float deltaLon = ((res & 1) ? ~(res >> 1) : (res >> 1));
longitude += deltaLon;
float finalLat = latitude * 1E-5;
float finalLon = longitude * 1E-5;
CLLocationCoordinate2D coord = CLLocationCoordinate2DMake(finalLat, finalLon);
coords[coordIdx++] = coord;
NSLog(@"in encoding %f %f ",latitude,longitude);
if (coordIdx == count) {
NSUInteger newCount = count + 10;
coords = realloc(coords, newCount * sizeof(CLLocationCoordinate2D));
count = newCount;
}
}
MKPolyline *polyline = [MKPolyline polylineWithCoordinates:coords count:coordIdx];
free(coords);
return polyline;
}
// to draw actual route
- (MKOverlayView *)mapView:(MKMapView *)mapView
viewForOverlay:(id<MKOverlay>)overlay {
MKPolylineView *overlayView = [[MKPolylineView alloc] initWithOverlay:overlay];
overlayView.lineWidth = 2;
overlayView.strokeColor = [UIColor purpleColor];
overlayView.fillColor = [[UIColor purpleColor] colorWithAlphaComponent:0.1f];
return overlayView;
}
After your line
NSArray *steps=[[aary objectAtIndex:0]valueForKey:@"steps"];
replace lines with this may work
NSMutableArray *polyLinesArray = [[NSMutableArray alloc] init];
for (int i = 0; i < [steps count]; i++)
{
NSString* encodedPoints = [[[steps objectAtIndex:i] objectForKey:@"polyline"] valueForKey:@"points"];
MKPolyline *route = [self polylineWithEncodedString:encodedPoints];
[polyLinesArray addObject:route];
}
[self.mapView addOverlays:polyLinesArray];
[polyLinesArray release];
这篇关于在iPhone MapView中，绘制路线部分未获得所需的输出的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
