CGImage rotating when i draw it on CGContext

Question

I have next code which is called every time user touches the screen and modifies the UIBezierPath

  CGContextRef context = UIGraphicsGetCurrentContext();
  CGContextDrawImage(context, self.bounds, image);

  [lineColor setStroke];
  [currentPath stroke];
  if(panEnded)
  {
    if(image!=nil)
    {
      CFRelease(image);
    }
    image=nil;
    image=CGBitmapContextCreateImage(context);
    panEnded=false;
  }

so every time i create new image (from "if" branch) it rotates 180 degrees. what am i doing wrong?

Answer 1

I solved the problem by rotating image in separate context each time it is taken:

- (void)drawRect:(CGRect)rect
{
  CGContextRef context = UIGraphicsGetCurrentContext();
  CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image),CGImageGetHeight(image)), image);
  [lineColor setStroke];
  [currentPath stroke];
  if(panEnded)
  {
    if(image!=nil)
    {
      CFRelease(image);
    }
    image=nil;
    image=CGBitmapContextCreateImage(context);
    [self rotateCGImage];
    panEnded=false;
    currentPath=nil;
  }
}

-(void)rotateCGImage
{
  UIGraphicsBeginImageContext(CGSizeMake(CGImageGetWidth(image), CGImageGetHeight(image)));
  CGContextRef context = UIGraphicsGetCurrentContext();
  CGContextDrawImage(context, CGRectMake(0 , 0, CGImageGetWidth(image), CGImageGetHeight(image)), image);


  CGContextRotateCTM (context, radians(90));
  if(image!=nil)
  {
    CFRelease(image);
  }
  image=nil;
  image=CGBitmapContextCreateImage(context);

}