Added support for drawing polylines on snapshots

ios/AirMaps.xcodeproj/project.pbxproj

@@ -155,6 +155,7 @@
 				1125B2D31C4AD3DA007D0023 /* AIRMapPolyline.h */,
 				1125B2D51C4AD3DA007D0023 /* AIRMapPolylineManager.h */,
 				1125B2D61C4AD3DA007D0023 /* AIRMapPolylineManager.m */,
+				21B6E2D21D99B886007E664F /* AIRMapSnapshot.h */,
 				1125B2F01C4AD445007D0023 /* SMCalloutView.h */,
 				1125B2F11C4AD445007D0023 /* SMCalloutView.m */,
 				1125B2D81C4AD3DA007D0023 /* RCTConvert+MoreMapKit.h */,

ios/AirMaps/AIRMapManager.m

@@ -284,6 +284,12 @@ - (void)takeMapSnapshot:(AIRMap *)mapView
                               [pin.image drawAtPoint:point];
                           }
                       }
+
+                      for (id <AIRMapSnapshot> overlay in mapView.overlays) {
+                          if ([overlay respondsToSelector:@selector(drawToSnapshot:context:)]) {
+                                  [overlay drawToSnapshot:snapshot context:UIGraphicsGetCurrentContext()];
+                          }
+                      }
 
                       UIImage *compositeImage = UIGraphicsGetImageFromCurrentImageContext();
 

ios/AirMaps/AIRMapPolyline.m

@@ -104,4 +104,43 @@ - (BOOL)canReplaceMapContent
     return NO;
 }
 
+
+#pragma mark AIRMapSnapshot implementation
+
+- (void) drawToSnapshot:(MKMapSnapshot *) snapshot context:(CGContextRef) context
+{
+    // Prepare context
+    CGContextSetStrokeColorWithColor(context, self.strokeColor.CGColor);
+    CGContextSetLineWidth(context, self.strokeWidth);
+    CGContextSetLineCap(context, self.lineCap);
+    CGContextSetLineJoin(context, self.lineJoin);
+    CGContextSetMiterLimit(context, self.miterLimit);
+    CGFloat dashes[self.lineDashPattern.count];
+    for (NSUInteger i = 0; i < self.lineDashPattern.count; i++) {
+        dashes[i] = self.lineDashPattern[i].floatValue;
+    }
+    CGContextSetLineDash(context, self.lineDashPhase, dashes, self.lineDashPattern.count);
+
+    // Begin path
+    CGContextBeginPath(context);
+
+    // Get coordinates
+    CLLocationCoordinate2D coordinates[[self.polyline pointCount]];
+    [self.polyline getCoordinates:coordinates range:NSMakeRange(0, [self.polyline pointCount])];
+
+    // Draw line segments
+    for(int i = 0; i < [self.polyline pointCount]; i++) {
+        CGPoint point = [snapshot pointForCoordinate:coordinates[i]];
+        if (i == 0) {
+            CGContextMoveToPoint(context,point.x, point.y);
+        }
+        else{
+            CGContextAddLineToPoint(context,point.x, point.y);
+        }
+    }
+
+    // Finish path
+    CGContextStrokePath(context);
+}
+
 @end

ios/AirMaps/AIRMapSnapshot.h

@@ -0,0 +1,17 @@
+//
+//  AIRMapSnapshot.h
+//  AirMaps
+//
+//  Created by Hein Rutjes on 26/09/16.
+//  Copyright © 2016 Christopher. All rights reserved.
+//
+
+#ifndef AIRMapSnapshot_h
+#define AIRMapSnapshot_h
+
+@protocol AIRMapSnapshot <NSObject>
+@optional
+- (void) drawToSnapshot:(MKMapSnapshot *) snapshot context:(CGContextRef) context;
+@end
+
+#endif /* AIRMapSnapshot_h */