I am trying to draw and edit multiple lines on iOS. Each line has a UIView at each end acting as handles so once the line is drawn a user can drag each end and the line will redraw.
Im currently using a UIBezierPath to draw a CAShapelayer on the view. The issue I have is working the best way to then draw another one and which ever line is tapped on the user can edit this one.
Does anyone have any ideas about the best way for this? Is CAShapelayer the best option?
Video Link that might show better what I'm trying to achieve.
https://www.dropbox.com/s/8rpt2azrs3uk6vr/Line%20Example.mov?dl=0
An example of the code I have done so far is below:
//Drawing a Line
Here I create a path from two touch points and the draw a CAShapeLayer on the view. I also create a custom object 'Line' to store the path and shapelayer.
-(void)DrawLineFrom:(CGPoint)pointA to:(CGPoint)pointB
{
NSLog(#"Drawing line X:%f Y:%f - X:%f Y:%f", pointA.x, pointA.y, pointB.x, pointB.y);
UIBezierPath* path = [[UIBezierPath alloc]init];
[path moveToPoint:pointA];
[path addLineToPoint:pointB];
[path addLineToPoint:CGPointMake(pointB.x, pointB.y+2)];
[path addLineToPoint:CGPointMake(pointA.x, pointA.y+2)];
[path addLineToPoint:pointA];
[path closePath];
currentLine.bPath = path;
if (!shapeLayer)
{
shapeLayer = [LineLayer layer];
[shapeLayer setFrame:self.view.frame];
shapeLayer.path = path.CGPath;
shapeLayer.strokeColor = [UIColor redColor].CGColor; //etc...
shapeLayer.lineWidth = 2.0; //etc...
shapeLayer.parent = currentLine;
currentLine.shapeLayer = shapeLayer;
[self.view.layer addSublayer:shapeLayer];
}
else
{
shapeLayer.path = path.CGPath;
}
[self ExitDrawMode];
}
//Creating a Handle
This creates the two views at either end and adds the Long Press Gesture.
-(HandleView *)MakeLineHandleForPoint:(int)point atLocation:(CGPoint)loc
{
HandleView *pointView = [[HandleView alloc]initWithFrame:CGRectMake(loc.x-10, loc.y-10, 20, 20)];
pointView.layer.cornerRadius = 10;
pointView.backgroundColor = [UIColor redColor];
UILongPressGestureRecognizer *LP = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:#selector(handleLp:)];
[pointView addGestureRecognizer:LP];
LP.delegate = self;
LP.minimumPressDuration = 0.0;
pointView.userInteractionEnabled = YES;
pointView.tag = point;
pointView.lineParent = currentLine;
return pointView;
}
Finally the gesture is handled here. This works fine however will always move the last line drawn. Even if I have selected the first one.
-(void)handleLp:(UILongPressGestureRecognizer *)sender
{
CGPoint loc = [sender locationInView:self.view];
[sender view].center = loc;
HandleView *handleView = [sender view];
if ([sender view].tag == 0) {
currentLine.pointA = loc;
[self DrawLineFrom:loc to:currentLine.pointB];
}
if ([sender view].tag == 1) {
currentLine.pointB = loc;
[self DrawLineFrom:currentLine.pointA to:loc];
}
}
Any Help much appreciated. Thanks in advance.
Related
I am masking UIView(240 * 240) in tringular shape using UIBezierPath as follows:
path = [UIBezierPath new];
[path moveToPoint:(CGPoint){0, 240}];
[path addLineToPoint:(CGPoint){120,0}];
[path addLineToPoint:(CGPoint){240,240}];
[path addLineToPoint:(CGPoint){0,240}];
[path closePath];
CAShapeLayer *mask = [CAShapeLayer new];
mask.frame = self.viewShape.bounds;
mask.path = path.CGPath;
self.viewShape.layer.mask = mask;
In above Image triangular area is mask. Now I have image of "Coca-Cola" which is to be moved only in triangular mask. So, for that I have apply UIPanGestureRecognizer to UIIMageView and restrict its frame in following way.
- (void)handlePanGesture:(UIPanGestureRecognizer *)gestureRecognizer
{
CGPoint touchLocation = [gestureRecognizer locationInView:self.viewShape];
CGRect boundsRect;
BOOL isInside = [path containsPoint:CGPointMake(self.innerView.center.x, self.innerView.center.y)];
NSLog(#"value:%d",isInside);
if (isInside) {
NSLog(#"inside");
self.innerView.center = touchLocation;
}else{
NSLog(#"outside");
}
}
My above if condition executes successfully but when control goes into else condition I am not able to drag back my ImageView inside mask frame.
So, My question is when else block(outside) called I should be able to drag imageView again inside the Mask's frame.
How can I achieve this?
saving reference to last center of imageview is a way to achieve this.
in your customView;
CGPoint lastValidCenter; //initially it is the center of imageview;
and in the code
NSLog(#"value:%d",isInside);
if (isInside) {
NSLog(#"inside");
self.innerView.center = touchLocation;
lastValidCenter = self.innerView.center;
}else{
NSLog(#"outside");
self.innerView.center = lastValidCenter;
}
There is a problem in your calculation. What you need to do is to check the top-left and top-right corner of the UIImageView for contains point with UIBezirePath instance.
It is so because when the image will move both of these corners are the ones which will try to go out first. So just put a check and you'll get your desired output.
BOOL isInside = [path containsPoint:CGPointMake(CGRectGetMinX(self.innerView.bounds), CGRectGetMinY(self.innerView.bounds))];
isInside = isInside || [path containsPoint:CGPointMake(CGRectGetMaxX(self.innerView.bounds), CGRectGetMinY(self.innerView.bounds))];
if (isInside) {
//Move your UIImageView
}
else {
//Don't move
}
I modified some portion of Meth's code. The code is as follows:
self.innerView.center = touchLocation;
BOOL isInside = [path containsPoint:CGPointMake(self.innerView.center.x, self.innerView.center.y)];
if (isInside) {
NSLog(#"inside");
self.innerView.center = touchLocation;
lastValidCenter = self.innerView.center;
}else{
NSLog(#"outside");
self.innerView.center = lastValidCenter;
}
I want my custom view to clear everything (subviews, sublayers, drawings, etc.) in it and call drawRect: again when pressing a button, so it will be like getting a clean slate and painting on it again.
Right now, I've tried using setNeedsDisplay and it just draws over the whole thing without cleaning the previous work.
A snippet of code in my drawRect:
if (_displayYAxisAverageLine) {
// Check if y axis data are numbers
for (id yValue in yAxisValues) {
if (![yValue isKindOfClass:[NSNumber class]]) {
return;
}
}
NSNumber *average = [yAxisValues valueForKeyPath:#"#avg.self"];
CGFloat scale = [self scaleForYValue:average];
CGFloat avgLineY = roundf(graphHeight * scale)+_graphInset;
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointMake(0, avgLineY)];
[path addLineToPoint:CGPointMake(contentWidth, avgLineY)];
CAShapeLayer *avgLine = [CAShapeLayer layer];
avgLine.path = path.CGPath;
avgLine.fillColor = [UIColor clearColor].CGColor;
avgLine.strokeColor = _borderColor.CGColor;
avgLine.lineWidth = 1.f;
avgLine.lineDashPattern = #[#2, #2];
[self.contentView.layer addSublayer:avgLine];
}
Taking a next step from this post Drag UIView around Shape Comprised of CGMutablePaths , I am trying to add a line which is on one end pinned to the center of the pathLayer_ and the other end gets dragged along with the circular object (circleLayer in handleView_) on the path (figure-8).
The line has its own layer andview and path initiated in (void)initHandleView.
First: I am not able to get the line to go through the center of the pathLayer_:
- (void)viewDidLoad {
[super viewDidLoad];
[self initPathLayer];
[self initHandleView];
[self initHandlePanGestureRecognizer];
}
- (void)initPathLayer {
pathLayer_ = [CAShapeLayer layer];
pathLayer_.lineWidth = 1;
pathLayer_.fillColor = nil;
pathLayer_.strokeColor = [UIColor lightGrayColor].CGColor;
pathLayer_.lineCap = kCALineCapButt;
pathLayer_.lineJoin = kCALineJoinRound;
pathLayer_.frame = self.view.bounds;
pathLayerCenter_ = CGPointMake(CGRectGetMidX(pathLayer_.frame), CGRectGetMidY(pathLayer_.frame));
[self.view.layer addSublayer:pathLayer_];
}
- (void)initHandleView {
handlePathPointIndex_ = 0;
CGRect rect = CGRectMake(0, 0, 30, 30);
CAShapeLayer *circleLayer = [CAShapeLayer layer];
circleLayer.fillColor = [UIColor redColor].CGColor;
circleLayer.strokeColor = [UIColor redColor].CGColor;
circleLayer.lineWidth = 2;
UIBezierPath *circlePath = [UIBezierPath bezierPathWithOvalInRect:CGRectInset(rect, circleLayer.lineWidth, circleLayer.lineWidth)];
circleLayer.frame = rect;
circleLayer.path = circlePath.CGPath;
handleView_ = [[UIView alloc] initWithFrame:rect];
CGRect lineRect = CGRectMake(0,0,CGRectGetMaxX([[UIScreen mainScreen] bounds]), CGRectGetMaxY([[UIScreen mainScreen] bounds]));
CGPoint center = CGPointMake(CGRectGetMidX(pathLayer_.frame), CGRectGetMidY(pathLayer_.frame));
lineView_ = [[UIView alloc] initWithFrame:lineRect];
CAShapeLayer *lineLayer = [CAShapeLayer layer];
lineLayer.fillColor = [UIColor blueColor].CGColor;
lineLayer.strokeColor = [UIColor blueColor].CGColor;
lineLayer.lineWidth = 2;
lineLayer.frame = self.view.bounds;
UIBezierPath *linePath = [UIBezierPath bezierPath];
CGPoint circlePoint = CGPointMake(handleView_.center.x, handleView_.center.y);
[linePath moveToPoint:center]; //Center
[linePath addLineToPoint:circlePoint];
[linePath moveToPoint:circlePoint]; //Handle
lineLayer.path = linePath.CGPath;
[handleView_.layer insertSublayer:circleLayer above:handleView_.layer];
[handleView_.layer insertSublayer:lineLayer above:handleView_.layer];
// handleView_.layer.masksToBounds = YES;
float direction = DEGREES_TO_RADIANS(10);
CGAffineTransform rotationTransform = CGAffineTransformMakeRotation(direction);
[handleView_ setTransform:rotationTransform];
[self.view addSubview:lineView_];
[self.view addSubview:handleView_];
}
And second: I am not sure I do the right thing with the PanGesturerecognizer:
- (void)handleWasPanned:(UIPanGestureRecognizer *)recognizer {
switch (recognizer.state) {
case UIGestureRecognizerStateBegan: {
desiredHandleCenter_ = handleView_.center;
break;
}
case UIGestureRecognizerStateChanged:
case UIGestureRecognizerStateEnded:
case UIGestureRecognizerStateCancelled: {
CGPoint translation = [recognizer translationInView:self.view];
desiredHandleCenter_.x += translation.x;
desiredHandleCenter_.y += translation.y;
[self moveHandleTowardPointAndRotateLine:desiredHandleCenter_];
break;
}
default:
break;
}
[recognizer setTranslation:CGPointZero inView:self.view];
}
- (void)moveHandleTowardPointAndRotateLine:(CGPoint)point {
CGFloat earlierDistance = [self distanceToPoint:point ifHandleMovesByOffset:-1];
CGFloat currentDistance = [self distanceToPoint:point ifHandleMovesByOffset:0];
CGFloat laterDistance = [self distanceToPoint:point ifHandleMovesByOffset:1];
if (currentDistance <= earlierDistance && currentDistance <= laterDistance)
return;
NSInteger step;
CGFloat distance;
if (earlierDistance < laterDistance) {
step = -1;
distance = earlierDistance;
} else {
step = 1;
distance = laterDistance;
}
NSInteger offset = step;
while (true) {
NSInteger nextOffset = offset + step;
CGFloat nextDistance = [self distanceToPoint:point ifHandleMovesByOffset:nextOffset];
if (nextDistance >= distance)
break;
distance = nextDistance;
offset = nextOffset;
}
handlePathPointIndex_ += offset;
// Make one end of the line move with handle (point) while the other is pinned to center of pathLayer_ (ie. in figure8 its the cross point, in a circle it's center)
//CGFloat rot = [self getTouchAngle:point];
CGFloat rot = atan2f((point.x - pathLayerCenter_.x), -(point.y - pathLayerCenter_.y));
handleView_.layer.transform = CATransform3DMakeRotation(rot, 0., 0., 1.);
[self layoutHandleView];
}
I'm just going to ignore your code and tell you how I'd modify my original answer to add the line you want.
First, I'm going to use a dedicated shape layer for the line, so I'll add an instance variable to reference the line layer:
#implementation ViewController {
CAShapeLayer *lineLayer_; // NEW!!!
UIBezierPath *path_;
CAShapeLayer *pathLayer_;
etc.
I need to initialize the line layer when I load the view:
- (void)viewDidLoad {
[super viewDidLoad];
[self initPathLayer];
[self initHandleView];
[self initHandlePanGestureRecognizer];
[self initLineLayer]; // NEW!!!
}
- (void)initLineLayer {
lineLayer_ = [CAShapeLayer layer];
lineLayer_.lineWidth = 1;
lineLayer_.fillColor = nil;
lineLayer_.strokeColor = [UIColor redColor].CGColor;
lineLayer_.lineCap = kCALineCapRound;
lineLayer_.lineJoin = kCALineJoinRound;
[self.view.layer addSublayer:lineLayer_];
}
I need to lay out the line layer when I lay out my top-level view (when it's first shown and on rotations):
- (void)viewDidLayoutSubviews {
[super viewDidLayoutSubviews];
[self createPath];
[self createPathPoints];
[self layoutPathLayer];
[self layoutHandleView];
[self layoutLineLayer]; // NEW!!!
}
- (void)layoutLineLayer {
lineLayer_.frame = self.view.bounds;
CGRect bounds = self.view.bounds;
CGPoint start = CGPointMake(CGRectGetMidX(bounds), CGRectGetMidY(bounds));
CGPoint end = pathPoints_[handlePathPointIndex_];
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:start];
[path addLineToPoint:end];
lineLayer_.path = path.CGPath;
}
Finally, I need to lay out the line layer again (to update its path) whenever I update the handle:
- (void)moveHandleTowardPoint:(CGPoint)point {
// I have omitted most of this method body for brevity.
// Just copy it from the original answer.
...
...
handlePathPointIndex_ += offset;
[self layoutHandleView];
[self layoutLineLayer]; // NEW!!!
}
Result:
I'm attempting to get the reference to a UImageView that is underneath a masked UIImageView using hitTest withEvent. Here is what I have that is not working:
UIView A that contains 3 UIImageViews as subviews: panelOne, panelTwo, and panelThree. panelThree is takes up the entire frame but is masked into a triangle, revealing parts of panels one and two. So I need to detect when a user taps outside of that rectangle and send the touch to the appropriate UIImageView.
Code: (CollagePanel is a subclass of UIImageView)
-(void)triangleInASquare
{
CGSize size = self.frame.size;
CollagePanel *panelOne = [[CollagePanel alloc] initWithFrame:CGRectMake(0,0, size.width/2, size.height)];
panelOne.panelScale = panelOne.frame.size.width/self.frame.size.width;
panelOne.backgroundColor = [UIColor greenColor];
CollagePanel *panelTwo = [[CollagePanel alloc] initWithFrame:CGRectMake(size.width/2,0, size.width/2, size.height)];
panelTwo.panelScale = panelOne.frame.size.width/self.frame.size.width;
panelTwo.backgroundColor = [UIColor purpleColor];
CollagePanel *panelThree = [[CollagePanel alloc] initWithFrame:CGRectMake(0,0, size.width, size.height)];
panelThree.backgroundColor = [UIColor orangeColor];
UIBezierPath* trianglePath = [UIBezierPath bezierPath];
[trianglePath moveToPoint:CGPointMake(0, panelThree.frame.size.height)];
[trianglePath addLineToPoint:CGPointMake(panelThree.frame.size.width/2,0)];
[trianglePath addLineToPoint:CGPointMake(panelThree.frame.size.width, panelTwo.frame.size.height)];
[trianglePath closePath];
// Mask the panels's layer to triangle.
CAShapeLayer *triangleMaskLayer = [CAShapeLayer layer];
[triangleMaskLayer setPath:trianglePath.CGPath];
triangleMaskLayer.strokeColor = [[UIColor whiteColor] CGColor];
panelThree.layer.mask = triangleMaskLayer;
//Add border
CAShapeLayer *borderLayer = [CAShapeLayer layer];
borderLayer.strokeColor = [[UIColor whiteColor] CGColor];
borderLayer.fillColor = [[UIColor clearColor] CGColor];
borderLayer.lineWidth = 6;
[borderLayer setPath:trianglePath.CGPath];
[panelThree.layer addSublayer:borderLayer];
NSMutableArray *tempArray = [[NSMutableArray alloc] init];
[tempArray addObject:panelOne];
[tempArray addObject:panelTwo];
[tempArray addObject:panelThree];
[self addGestureRecognizersToPanelsInArray:tempArray];
[self addPanelsFromArray:tempArray];
self.panelArray = tempArray;
}
-(void)handleTap: (UITapGestureRecognizer*) recognizer //coming from panel.imageView
{
CGPoint tapPoint = [recognizer locationInView:self];
NSLog(#"Location in self: %#", NSStringFromCGPoint(tapPoint));
NSLog(#"self.subviews: %#", self.subviews);
UIView *bottomView = [self hitTest:tapPoint withEvent:nil];
NSLog(#"Bottom View: %#", bottomView);
}
The NSLog of bottomView is always panelThree (the topmost panel). From what I understand the hit test should be returning the "bottom most" subview.
you understand wrong. it will return the view that recognizes itself as touched and is nearest to your finger, nearer to the top.
If a view shall not recognize itself as touch for a certain point, you need to overwrite
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
for that view.
I think Ole Begemann's Shapped Button is a great example how to do so.
In your project this method could determine, if a point lies within the paths: CGPathContainsPoint.
Your pointInside:withEvent: might look like this:
#import "CollagePanel.h"
#import <QuartzCore/QuartzCore.h>
#implementation CollagePanel
//
// ...
//
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
{
CGPoint p = [self convertPoint:point toView:[self superview]];
if(self.layer.mask){
if (CGPathContainsPoint([(CAShapeLayer *)self.layer.mask path], NULL, p, YES) )
return YES;
}else {
if(CGRectContainsPoint(self.layer.frame, p))
return YES;
}
return NO;
}
#end
In my app, user draws a shape on map and using UIBeizerPath i am drawing that path. Then based on the coordinates of the path i am displaying the results which are only in that area. Everything works great except that now when Annotations drops on the Map view the pins looks like they are behind the path which means path looks in the front.
I am using this code to display the Annotation and path :
-(void)clearAnnotationAndPath:(id)sender {
[_mapView removeAnnotations:_mapView.annotations];
path = [UIBezierPath bezierPath];
[shapeLayer removeFromSuperlayer];
}
- (void)handleGesture:(UIPanGestureRecognizer *)gesture
{
CGPoint location = [gesture locationInView:_pathOverlay];
if (gesture.state == UIGestureRecognizerStateBegan)
{
shapeLayer = [[CAShapeLayer alloc] init];
shapeLayer.fillColor = [[UIColor clearColor] CGColor];
shapeLayer.strokeColor = [[UIColor greenColor] CGColor];
shapeLayer.lineWidth = 5.0;
//[_mapView.layer addSublayer:shapeLayer];
[pathOverlay.layer addSublayer:shapeLayer];
path = [UIBezierPath bezierPath];
[path moveToPoint:location];
}
else if (gesture.state == UIGestureRecognizerStateChanged)
{
[path addLineToPoint:location];
shapeLayer.path = [path CGPath];
}
else if (gesture.state == UIGestureRecognizerStateEnded)
{
// MKMapView *mapView = (MKMapView *)gesture.view;
[path addLineToPoint:location];
[path closePath];
allStations = [RoadmapData sharedInstance].data;
for (int i=0; i<[allStations count]; i++) {
NSDictionary * itemNo = [allStations objectAtIndex:i];
NSString * fullAddress = [NSString stringWithFormat:#"%#,%#,%#,%#",[itemNo objectForKey:#"address"],[itemNo objectForKey:#"city"],[itemNo objectForKey:#"state"],[itemNo objectForKey:#"zip"]];
CLGeocoder * geoCoder = [[CLGeocoder alloc]init];
[geoCoder geocodeAddressString:fullAddress completionHandler:^(NSArray *placemarks, NSError *error) {
if (error) {
NSLog(#"Geocode failed with error: %#", error);
return;
}
if(placemarks && placemarks.count > 0)
{
CLPlacemark *placemark = placemarks[0];
CLLocation *location = placemark.location;
CLLocationCoordinate2D coords = location.coordinate;
CGPoint loc = [_mapView convertCoordinate:coords toPointToView:_pathOverlay];
if ([path containsPoint:loc])
{
NSString * name = [itemNo objectForKey:#"name"];
stationAnn = [[LocationAnnotation alloc]initWithCoordinate:coords Title:name subTitle:#"Wells Fargo Offer" annIndex:i];
stationAnn.tag = i;
[_mapView addAnnotation:stationAnn];
}
else{
NSLog(#"Out of boundary");
}
}
}];
[self turnOffGesture:gesture];
}
}
}
- (void)mapView:(MKMapView *)aMapView didAddAnnotationViews:(NSArray *)views{
if (views.count > 0) {
UIView* firstAnnotation = [views objectAtIndex:0];
UIView* parentView = [firstAnnotation superview];
if (_pathOverlay == nil){
// create a transparent view to add bezier paths to
pathOverlay = [[UIView alloc] initWithFrame: parentView.frame];
pathOverlay.opaque = NO;
pathOverlay.backgroundColor = [UIColor clearColor];
[parentView addSubview:pathOverlay];
}
// make sure annotations stay above pathOverlay
for (UIView* view in views) {
[parentView bringSubviewToFront:view];
}
}
}
Also once i go back from this and view and come again its not even drawing the Path.
Please help.
Thanks,
Apparently, when you add your bezier path to the map via:
[_mapView.layer addSublayer:shapeLayer];
it is getting added above some internal layer that MKMapView uses to draw the annotations. If you take a look at this somewhat related question, you'll see that you can implement the MKMapViewDelegate protocol, and get callbacks when new station annotations are added. When this happens, you basically inspect the view heirarchy of the newly added annotations, and insert a new, transparent UIView layer underneath them. You take care to bring all the annotations in front of this transparent UIView.
// always remember to assign the delegate to get callbacks!
_mapView.delegate = self;
...
#pragma mark - MKMapViewDelegate
- (void)mapView:(MKMapView *)aMapView didAddAnnotationViews:(NSArray *)views{
if (views.count > 0) {
UIView* firstAnnotation = [views objectAtIndex:0];
UIView* parentView = [firstAnnotation superview];
// NOTE: could perform this initialization in viewDidLoad, too
if (self.pathOverlay == nil){
// create a transparent view to add bezier paths to
pathOverlay = [[UIView alloc] initWithFrame: parentView.frame];
pathOverlay.opaque = NO;
pathOverlay.backgroundColor = [UIColor clearColor];
[parentView addSubview:pathOverlay];
}
// make sure annotations stay above pathOverlay
for (UIView* view in views) {
[parentView bringSubviewToFront:view];
}
}
}
Then, instead of adding your shape layer to _mapView.layer, you add it to your transparent view layer, also using this new layer in the coordinate conversion:
- (void)handleGesture:(UIPanGestureRecognizer*)gesture
{
CGPoint location = [gesture locationInView: self.pathOverlay];
if (gesture.state == UIGestureRecognizerStateBegan)
{
if (!shapeLayer)
{
shapeLayer = [[CAShapeLayer alloc] init];
shapeLayer.fillColor = [[UIColor clearColor] CGColor];
shapeLayer.strokeColor = [[UIColor greenColor] CGColor];
shapeLayer.lineWidth = 5.0;
[pathOverlay.layer addSublayer:shapeLayer]; // <- change here !!!
}
self.path = [[UIBezierPath alloc] init];
[path moveToPoint:location];
}
else if (gesture.state == UIGestureRecognizerStateChanged)
{
[path addLineToPoint:location];
shapeLayer.path = [path CGPath];
}
else if (gesture.state == UIGestureRecognizerStateEnded)
{
/*
* This code is the same as what you already have ...
*/
// But replace this next line with the following line ...
//CGPoint loc = [_mapView convertCoordinate:coords toPointToView:self];
CGPoint loc = [_mapView convertCoordinate:coords toPointToView: self.pathOverlay];
/*
* And again use the rest of your original code
*/
}
}
where I also added an ivar (and property) for the new transparent layer:
UIView* pathOverlay;
I tested this with a bogus grid of stations and got the following results:
P.S. I'd also recommend getting rid of your static variables. Just make them ivars/properties of your class.