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78 lines
2.6 KiB
78 lines
2.6 KiB
2 years ago
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#if !defined(__has_feature) || !__has_feature(objc_arc)
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#error "This file requires ARC support."
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#endif
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#import "GoogleMapsDemos/Samples/GradientPolylinesViewController.h"
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#import <GoogleMaps/GoogleMaps.h>
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@implementation GradientPolylinesViewController {
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GMSMapView *_mapView;
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GMSPolyline *_polyline;
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NSMutableArray *_trackData;
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}
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- (void)viewDidLoad {
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[super viewDidLoad];
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GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:44.1314
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longitude:9.6921
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zoom:14.059f
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bearing:328.f
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viewingAngle:40.f];
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_mapView = [GMSMapView mapWithFrame:CGRectZero camera:camera];
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self.view = _mapView;
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[self parseTrackFile];
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[_polyline setSpans:[self gradientSpans]];
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}
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- (NSArray *)gradientSpans {
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NSMutableArray *colorSpans = [NSMutableArray array];
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NSUInteger count = [_trackData count];
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UIColor *prevColor;
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for (NSUInteger i = 0; i < count; i++) {
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NSDictionary *dict = [_trackData objectAtIndex:i];
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double elevation = [[dict objectForKey:@"elevation"] doubleValue];
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UIColor *toColor = [UIColor colorWithHue:(float)elevation/700
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saturation:1.f
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brightness:.9f
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alpha:1.f];
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if (prevColor == nil) {
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prevColor = toColor;
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}
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GMSStrokeStyle *style = [GMSStrokeStyle gradientFromColor:prevColor toColor:toColor];
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[colorSpans addObject:[GMSStyleSpan spanWithStyle:style]];
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prevColor = toColor;
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}
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return colorSpans;
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}
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- (void)parseTrackFile {
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NSString *filePath = [[NSBundle mainBundle] pathForResource:@"track" ofType:@"json"];
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NSData *data = [NSData dataWithContentsOfFile:filePath];
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NSArray *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
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_trackData = [[NSMutableArray alloc] init];
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GMSMutablePath *path = [GMSMutablePath path];
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for (NSUInteger i = 0; i < [json count]; i++) {
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NSDictionary *info = [json objectAtIndex:i];
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NSNumber *elevation = [info objectForKey:@"elevation"];
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CLLocationDegrees lat = [[info objectForKey:@"lat"] doubleValue];
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CLLocationDegrees lng = [[info objectForKey:@"lng"] doubleValue];
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CLLocation *loc = [[CLLocation alloc] initWithLatitude:lat longitude:lng];
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[_trackData addObject:@{@"loc": loc, @"elevation": elevation}];
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[path addLatitude:lat longitude:lng];
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}
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_polyline = [GMSPolyline polylineWithPath:path];
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_polyline.strokeWidth = 6;
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_polyline.map = _mapView;
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}
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@end
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