merge two images

[Asad Ullah]

Hello All 

i want to add/merge two images into one image and then save the final
image.
like for example i want to add frames to an image, frames are also images.
i will add/merge two images and then get the final one image.


Thanks in advance.

[Cantek Batur]

Hi again,

I have the following array;

NSMutableArray *arrayStocks = [[NSArray alloc] initWithObjects:@"TG:ED:DELL", @"WE:DR:HHG:UU:TRF:DEF:WWS", @"WW:A:SD:QA", @"ER:DW", @"", @"", @"", @"", @"G", nil];

self.listOfItems = arrayStocks;

[arrayStocks release]; 

and I'd like to create another array from this one that holds the number of characters seperated by " : " .  The second array should look like

NSMutableArray *arrayCount = [[NSArray alloc] initWithObjects:@"3", @"7", @"4", @"2", @"0", @"0", @0"", @"0", @"1", nil];

self.itemCount = arrayCount;

[arrayCount release]; 

any help is appreciated, 

Thanks

[Lucas Neiva]

Loop through the arrayStocks Array, use "componentsSeparatedByString" to split the Strings, use "count" to get the count and add them the array arrayCounts:

NSMutableArray *arrayCounts= [[NSMutableArray alloc] initWithCapacity:[arrayStocks count]];

for (NSString *string in arrayStocks) {

NSArray *stringItems= [string componentsSeparatedByString:@":"];

[arrayCounts addObject: [NSString stringWithFormat:@"%d", [stringItems count]; /* You could consider using NSNumber instead of NSString here */

}

NOTE: I did not compile or test this. But I'm sure it's something similar to this.

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[Cantek Batur]

Thanks Lucas,

I made it work exactly this way, but the problem is when there is 1 value it returns 1, when there is no value it again returns 1. 

[Lucas Neiva]

So you mean when string is @"" [stringItems count] returns 1, but should be returning 0?

Try something like this:

if ([[stringItems objectAtIndex:0] isEqualToString:@""]) {

[arrayCounts addObject:@"0"];

} else {

[arrayCounts addObject: [NSString stringWithFormat:@"%d", [stringItems count];

}

[Cantek Batur]

worked perfectly.

Thanks a million.

[lvcha]

Please provide details of the array objects type.
if you wanna separate NSStringArray object by " : ", you even don't
have to create another array.as following:

NSString *string = [[NSString alloc] initWithString:@"One,Two,Three,Four"];
NSArray *array = [string componentsSeparatedByString:@","];
NSLog(@"array:%@",array);
[string release];

you may just do :
NSMutableArray *arrayCount = [[NSArray alloc] initWithObjects: array, ...nil];

self.itemCount = arrayCount;
[arrayCount release];

if the array above is actual not NSString object,you must declare
details of the array objects type before you create the array above.

any problem please feel free to email me.

[David Phillip Oster]

To graphically merge two images into a new image, you do something
like this:

UIImage *result = nil;
unsigned char *data = calloc(1,
size.width*size.height*kBytesPerPixel);
if (data != NULL) {
// kCGImageAlphaPremultipliedLast documented by Apple as the value
to use
// for a context with alpha
CGContextRef context = CGBitmapContextCreate(
data, size.width, size.height, 8, size.width*kBytesPerPixel,
CGColorSpaceCreateDeviceRGB(), kCGImageAlphaPremultipliedLast);
if (context != NULL) {
UIGraphicsPushContext(context);
// UIImage is upside down compared to CGContext.
CGContextTranslateCTM(context, 0, size.height);
CGContextScaleCTM(context, 1, -1);
[image drawInRect:imageRect];
[image2 drawInRect:image2Rect];
UIGraphicsPopContext();
CGImageRef imageRef = CGBitmapContextCreateImage(context);
if (imageRef != NULL) {
result = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
}
CGContextRelease(context);
}
free(data);
}
return result;

[Asad Ullah]

The code you send works fine when you are reading static images from resources folder.
when i take image from camera then the problem is that i cannot get the final output image
in portrait form (up - down side form). i can only get the final image in landscape form (horizontal form) even i used the function correctly

CGContextTranslateCTM(context, 0, size.height);
   CGContextScaleCTM(context, 1, -1);

but still the problem appears .
please reply me.

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[David Phillip Oster]

CGContextTranslateCTM(context, 0, size.height);
CGContextScaleCTM(context, 1, -1);

Just flips the image from upside down to right side up. To rotate the
image by 90 degrees, you need to something more like:

CGContextTranslateCTM(context, 0, size.height);
CGContextScaleCTM(context, 1, -1);

CGContextTranslateCTM(context, size.width/2., size.height/2.);
CGContextRotateCTM(context, M_PI/2.);
CGContextTranslateCTM(context, -size.height/2., -size.width/2.);

That is, move the 0,0 of the coordinate system to the center of the
image, rotate is by PI/2 radians (90 degrees), then move the
coordinate system back to zero zero.

(Not tested.)