1 files changed, 59 insertions, 0 deletions
diff --git a/platform/ios/src/MGLUserLocationHeadingArrowLayer.m b/platform/ios/src/MGLUserLocationHeadingArrowLayer.m
new file mode 100644
index 0000000000..912ce30c35
--- /dev/null
+++ b/platform/ios/src/MGLUserLocationHeadingArrowLayer.m
@@ -0,0 +1,59 @@
+#import "MGLUserLocationHeadingArrowLayer.h"
+
+#import "MGLFaux3DUserLocationAnnotationView.h"
+#import "MGLGeometry.h"
+
+const CGFloat MGLUserLocationHeadingArrowSize = 6;
+
+@implementation MGLUserLocationHeadingArrowLayer
+
+- (instancetype)initWithUserLocationAnnotationView:(MGLUserLocationAnnotationView *)userLocationView
+{
+    CGFloat size = userLocationView.bounds.size.width + MGLUserLocationHeadingArrowSize;
+
+    self = [super init];
+    self.bounds = CGRectMake(0, 0, size, size);
+    self.position = CGPointMake(CGRectGetMidX(userLocationView.bounds), CGRectGetMidY(userLocationView.bounds));
+    self.path = [self arrowPath];
+    self.fillColor = userLocationView.tintColor.CGColor;
+    self.shouldRasterize = YES;
+    self.rasterizationScale = UIScreen.mainScreen.scale;
+    self.drawsAsynchronously = YES;
+
+    self.strokeColor = UIColor.whiteColor.CGColor;
+    self.lineWidth = 1.0;
+    self.lineJoin = kCALineJoinRound;
+
+    return self;
+}
+
+- (void)updateHeadingAccuracy:(CLLocationDirection)accuracy
+{
+    // unimplemented
+}
+
+- (void)updateTintColor:(CGColorRef)color
+{
+    self.fillColor = color;
+}
+
+- (CGPathRef)arrowPath {
+    CGFloat center = roundf(CGRectGetMidX(self.bounds));
+    CGFloat size = MGLUserLocationHeadingArrowSize;
+
+    CGPoint top =       CGPointMake(center,         0);
+    CGPoint left =      CGPointMake(center - size,  size);
+    CGPoint right =     CGPointMake(center + size,  size);
+    CGPoint middle =    CGPointMake(center,         size / M_PI);
+
+    UIBezierPath *bezierPath = [UIBezierPath bezierPath];
+    [bezierPath moveToPoint:top];
+    [bezierPath addLineToPoint:left];
+    [bezierPath addQuadCurveToPoint:right controlPoint:middle];
+    [bezierPath addLineToPoint:top];
+    [bezierPath closePath];
+    
+    return bezierPath.CGPath;
+}
+
+@end