Greetings,
I'm trying to draw a circle on a map. all the separate pieces of this project work independently but when I put them all together it breaks.
I setup my UI in my viewDidLoad, retaining most of it.
I then use touch events to call a my refresh map method:
Code:
-(void)refreshMap{
NSString *thePath = [NSString stringWithFormat:@"http://maps.google.com/staticmap?center=%f,%f&zoom=%i&size=640x640&maptype=hybrid",viewLatitude, viewLongitude, zoom];
NSURL *url = [NSURL URLWithString:thePath];
NSData *data = [NSData dataWithContentsOfURL:url];
UIImage *mapImage = [[UIImage alloc] initWithData:data];
mapImage = [self addCircle:(mapImage) influence:(70) latCon:(320) lonCon:(320)];
NSLog(@"-- mapimageview retaincount %i",[mapImage retainCount]);
mapImageView.image = mapImage;
[mapImage release];
}
Setup like this it will load the map with a circle once, but if the map is refreshed again it crashes.
If I comment out the mapImage release it works repeatedly but causes a memory leak.
The addCircle method I'm using:
Code:
-(UIImage *)addCircle:(UIImage *)img radius:(CGFloat)radius latCon:(CGFloat)lat lonCon:(CGFloat)lon{
int w = img.size.width;
int h = img.size.height;
lon = h - lon;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);
//draw the circle
CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);
CGRect leftOval = {lat- radius/2, lon - radius/2, radius, radius};
CGContextSetRGBFillColor(context, 0.0, 0.0, 1.0, 0.3);
CGContextAddEllipseInRect(context, leftOval);
CGContextFillPath(context);
CGImageRef imageMasked = CGBitmapContextCreateImage(context);
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
return [UIImage imageWithCGImage:imageMasked];
}
Any insight/advise is greatly appreciated!
