Drawing on UIIMage / Memory Issues

[puppet]

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:

-(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:

-(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!

[puppet]

I've got this issue figured out:

I have created a temp UIImage in my addcircle method, which allows me to release the cgimage and return my formatted UImage.

I also created a new UIImage for this to be returned to in my refreshMap method.

[hasitcometothis]

Originally Posted by puppet

I've got this issue figured out:

I have created a temp UIImage in my addcircle method, which allows me to release the cgimage and return my formatted UImage.

I also created a new UIImage for this to be returned to in my refreshMap method.

Hi,

I am having the exact same problem, I have a site map in the form of a PNG on which I want to draw a point when a certain action happens. I am having real trouble with even getting started. I was wondering if you could help me out a bit?

Thanks very much

Dave

[puppet]

Originally Posted by hasitcometothis

Hi,

I am having the exact same problem, I have a site map in the form of a PNG on which I want to draw a point when a certain action happens. I am having real trouble with even getting started. I was wondering if you could help me out a bit?

Thanks very much

Dave

Well, I should warn you that I am a new an inexperienced developer, and my advice should be taken lightly.

The above example is not terrible. (please someone correct me if I'm wrong)

Where to start I suppose I would recommend the tutorials on this site, they really helped me understand handling touch events, and even in specific; touches in uiimageviews.
iphonedevcentral.org video tutorials

If you have any specific questions to ask (such as how to accomplish a specific task) I will try to answer them.

[nehapundlik]

Originally Posted by puppet

Well, I should warn you that I am a new an inexperienced developer, and my advice should be taken lightly.

The above example is not terrible. (please someone correct me if I'm wrong)

Where to start I suppose I would recommend the tutorials on this site, they really helped me understand handling touch events, and even in specific; touches in uiimageviews.
iphonedevcentral.org video tutorials

If you have any specific questions to ask (such as how to accomplish a specific task) I will try to answer them.

I want to ask you wheather how you can draw a line on a view. I'm currently developing a game, & need to draw a line creating d string of a bow. can u please help?