how to print barcode in vb.net 2008 Collage: an image example in Objective-C

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Collage: an image example
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Figure 11.3 The collager displays many photos simultaneously.
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to momentarily. finishPic: also dismisses the UISlider and the tempImageView and resets the toolbar to its original setup. That original toolbar has one more button that we haven t covered yet: Save. It activates the savePic: method, which saves a CALayer to the photo library. Note that this method temporarily hides the toolbar in the process. Because the toolbar is a subview of the UIView, it would be included in the picture if you didn t do this. The last method, scaleImage:, is the utility that sets each image to fill about a quarter of the screen. This code has two dangling parts: the methods in the tempImageView, which allow a user to move the UIImageView, and the methods in the collageView, which later draw the image into a CALayer.
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11.4.2 The collage temporary image view
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The tempImageView class has only one purpose: to intercept UITouches that indicate that the user wants to move the new image to a different part of the collage. This simple code is shown in listing 11.3.
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Listing 11.3 Moving a temporary image by touches
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- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *thisTouch = [touches anyObject]; Determines CGPoint thisPoint = position in view [thisTouch locationInView:self];
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Media: images and the camera
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float newX = thisPoint.x+self.frame.origin.x; float newY = thisPoint.y+self.frame.origin.y; if (newX < 0) { newX = 0; } else if (newX > 320) { newX = 320; } if (newY < 0) { newY = 0; } else if (newY > 416) { newY = 416; } self.center = CGPointMake(newX,newY); }
Calculates overall position
This is similar to the touch code that you wrote in chapter 6. Recall that locationInView: B gives a CGPoint internal to the view s coordinate system and needs to be converted C into the global coordinate system of the application. In testing, we discovered that when run on an iPhone (but not in the iPhone Simulator), the result is sometimes out of bounds; you need to double-check the coordinates before you move the temporary image view.
11.4.3 The collage view
Last up we have the collageView, which is the background UIView that needs to respond to the addPic:at: message and draw onto the CALayer with drawRect:. The code to do this is shown in listing 11.4.
Listing 11.4 Background view managing low-level drawing when an image is set
-(void)addPic:(UIImage *)newPic at:(CGRect)newLoc { if (! myPics) { myPics = [[NSMutableArray alloc] initWithCapacity:0]; [myPics retain]; } [myPics addObject:[NSDictionary dictionaryWithObjectsAndKeys: newPic,@"picture", [NSNumber numberWithFloat:newLoc.origin.x],@"xpoint", [NSNumber numberWithFloat:newLoc.origin.y],@"ypoint", [NSNumber numberWithFloat:newLoc.size.width],@"width", [NSNumber numberWithFloat:newLoc.size.height],@"height", nil]]; [self setNeedsDisplay]; } - (void)drawRect:(CGRect)rect { if (myPics) { for (int i = 0 ; i < myPics.count ; i++) { UIImage *thisPic = [[myPics objectAtIndex:i] objectForKey:@"picture"]; float xpoint = [[[myPics objectAtIndex:i] objectForKey:@"xpoint"] floatValue]; float ypoint = [[[myPics objectAtIndex:i] objectForKey:@"ypoint"] floatValue];
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Summary
float height = [[[myPics objectAtIndex:i] objectForKey:@"height"] floatValue]; float width = [[[myPics objectAtIndex:i] objectForKey:@"width"] floatValue]; [thisPic drawInRect:CGRectMake(xpoint,ypoint,width,height)]; } } }
This code is broken into two parts. The addPic:at: method saves its information into an instance variable, adding a myPics dictionary to the NSMutableArray. Note that you have to convert values into NSNumbers so that you can place them in the dictionary. This method then calls setNeedsDisplay on the view. You should never call drawRect: directly. Instead, when you want it to be executed, call the setNeedsDisplay method, and everything else will be done for you. drawRect: is called shortly afterward. It reads through the whole NSMutableArray, breaks it apart, and draws each image onto the CALayer using the techniques you learned earlier. We haven t shown the few header files and the unchanged app delegate, but this is everything important needed to write a complete collage program.
11.4.4 Further exploration of this example
This was one of our longer examples, but it could still bear some expansion to turn it into a fully featured application. First, it s a little unfriendly with memory. It would be better to maintain references to filenames, rather than keep the UIImages around. In addition, the NSArray that the CALayer is drawn from should be saved out to a file so it won t get lost if memory is low. But the program as it exists should work fine. The program could be made more usable. An option to crop the pictures would be nice, but it may require access to Core Graphics functions. An option to move pictures around after they ve been locked in would be relatively simple: you could test for touches in the collageView and read backward through the NSArray to find which object the user was touching. Reinstantiating it as a UIImageView would then be simple.
11.5 Summary
Dealing with media is a huge topic that probably could fill a book on its own. Fortunately, there are relatively easy (if limited) ways to utilize each major sort of media. In this chapter, we discussed the various ways to manage and manipulate images on the iPhone and iPad. We first discussed how to load them from disk. This includes images saved in an application s directory as well as from the camera roll. We also showed you how the UIImagePickerController can be slightly modified to allow the user to take a photo and use it in an application. You ve seen how all these pictorial fundamentals work together, so we re now ready to move on to the next major types of media: audio and video.
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