Add Bearing to Apple Maps MapOverlay

alsun2001 · Aug 17, 2018 · e0c0c4d · e0c0c4d
1 parent a56ed5c
commit e0c0c4d
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Showing 3 changed files with 22 additions and 2 deletions.
diff --git a/lib/ios/AirMaps/AIRMapOverlay.h b/lib/ios/AirMaps/AIRMapOverlay.h
@@ -20,7 +20,7 @@
 @property (nonatomic, copy) NSString *imageSrc;
 @property (nonatomic, strong, readonly) UIImage *overlayImage;
 @property (nonatomic, copy) NSArray *boundsRect;
-@property (nonatomic, assign) NSInteger rotation;
+@property (nonatomic, assign) CLLocationDirection bearing;
 @property (nonatomic, assign) CGFloat transparency;
 @property (nonatomic, assign) NSInteger zIndex;
 

diff --git a/lib/ios/AirMaps/AIRMapOverlay.m b/lib/ios/AirMaps/AIRMapOverlay.m
@@ -40,7 +40,11 @@ - (void)setImageSrc:(NSString *)imageSrc
                                                                      }
                                                                      dispatch_async(dispatch_get_main_queue(), ^{
                                                                          NSLog(@">>> IMAGE: %@", image);
-                                                                         weakSelf.overlayImage = image;
+                                                                         if (_bearing == 0) {
+                                                                           weakSelf.overlayImage = image;
+                                                                         } else {
+                                                                           weakSelf.overlayImage = [self _rotateImage:image angle:360 - _bearing];
+                                                                         }
                                                                          [weakSelf createOverlayRendererIfPossible];
                                                                          [weakSelf update];
                                                                      });
@@ -61,6 +65,21 @@ - (void)setBoundsRect:(NSArray *)boundsRect {
     [self update];
 }
 
+- (UIImage *)_rotateImage:(UIImage *)image angle:(CGFloat)angle
+{
+  CGSize s = {image.size.width, image.size.height};
+  UIGraphicsBeginImageContextWithOptions(s, NO, 0.0f);
+  CGContextRef ctx = UIGraphicsGetCurrentContext();
+  CGContextTranslateCTM(ctx, 0,image.size.height);
+  CGContextScaleCTM(ctx, 1.0, -1.0);
+
+  CGContextRotateCTM(ctx, angle * M_PI / 180);
+  CGContextDrawImage(ctx, CGRectMake(0, 0, image.size.width, image.size.height), image.CGImage);
+  UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
+  UIGraphicsEndImageContext();
+  return newImage;
+}
+
 - (void)createOverlayRendererIfPossible
 {
     if (MKMapRectIsEmpty(_mapRect) || !self.overlayImage) return;

diff --git a/lib/ios/AirMaps/AIRMapOverlayManager.m b/lib/ios/AirMaps/AIRMapOverlayManager.m
@@ -22,6 +22,7 @@ - (UIView *)view
 
 RCT_REMAP_VIEW_PROPERTY(bounds, boundsRect, NSArray)
 RCT_REMAP_VIEW_PROPERTY(image, imageSrc, NSString)
+RCT_EXPORT_VIEW_PROPERTY(bearing, CGFloat)
 
 @end