Mini Curso iPhone

8/8/2019 Mini Curso iPhone

1/60

Development of Computer Graphics and

Digital Image Processing on the iPhone

Luciano Fagundes([email protected])

Rafael Santos([email protected])

domingo, 22 de agosto de 2010
mailto:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]


2/60

Agenda

Motivation iOS Devices Dev Basics

From Concept to the App Store



3/60

Agenda

Motivation



4/60

Motivation



5/60

Motivation



6/60

Motivation

Multi-purpouse device

Wide Community (Millions of iOS

devices world-wide) Easy to Deploy !!! (App Store)

Apps can and are changing the World (Size of the Market) See Gigaom

Infograph



7/60

Motivation

Old WAP-based Mobile Phones



8/60

iOS Devices

iPhone iPad iPod Touch



9/60

iOS Devices


Camera +Phone +

WiFi + 3G



10/60

iOS Devices


Camera +Phone +

WiFi + 3G

WiFi + 3G



11/60

iOS Devices


Camera +Phone +

WiFi + 3G

WiFi + 3G WiFi



12/60

iPhone

Tech Benchmark

Engadgetdomingo, 22 de agosto de 2010
http://www.engadget.com/2010/06/07/iphone-4-vs-the-smartphone-elite-evo-4g-n8-pre-plus-and-hd2/http://www.engadget.com/2010/06/07/iphone-4-vs-the-smartphone-elite-evo-4g-n8-pre-plus-and-hd2/


13/60

iPhone4/iPad

Tech Benchmark

PCMagazine

The iPad's graphics capabilities comefrom a PowerVR SGX GPU, similar tothe one found in the iPhone 3GS andiPod Touch. If the iPad is using the samePowerVR SGX 535 as in the 3GS, it canrender about 28 million polygons/ second ...

http://www.pcmag.com/article2/0,2817,2362040,00.asphttp://www.pcmag.com/article2/0,2817,2362040,00.asphttp://www.pcmag.com/article2/0,2817,2362040,00.asp


14/60

IPhone 3GS vs 3G



15/60

IPhone 3GS vs 3G



16/60

iPhone4 vs 3Gs

Early benchmarks of the iPhone 4 show it

to be 31% faster than the iPhone 3GSaccording to the Geekbench 2 app....

Macrumors

http://www.macrumors.com/2010/06/23/iphone-4-is-faster-than-3gs-and-slower-than-ipad-in-early-benchmarks/http://www.macrumors.com/2010/06/23/iphone-4-is-faster-than-3gs-and-slower-than-ipad-in-early-benchmarks/http://www.macrumors.com/2010/06/23/iphone-4-is-faster-than-3gs-and-slower-than-ipad-in-early-benchmarks/http://www.macrumors.com/2010/06/23/iphone-4-is-faster-than-3gs-and-slower-than-ipad-in-early-benchmarks/http://appshopper.com/utilities/geekbench-2http://appshopper.com/utilities/geekbench-2


17/60

iPhone4 vs 3Gs

Early benchmarks of the iPhone 4 show it

to be 31% faster than the iPhone 3GSaccording to the Geekbench 2 app....

Macrumors

Brings iPhone4 performance to ~36Million Polygons/sec

http://www.macrumors.com/2010/06/23/iphone-4-is-faster-than-3gs-and-slower-than-ipad-in-early-benchmarks/http://www.macrumors.com/2010/06/23/iphone-4-is-faster-than-3gs-and-slower-than-ipad-in-early-benchmarks/http://www.macrumors.com/2010/06/23/iphone-4-is-faster-than-3gs-and-slower-than-ipad-in-early-benchmarks/http://www.macrumors.com/2010/06/23/iphone-4-is-faster-than-3gs-and-slower-than-ipad-in-early-benchmarks/http://appshopper.com/utilities/geekbench-2http://appshopper.com/utilities/geekbench-2


18/60 Agenda

Dev BasicsMotivation iOS Devices




19/60 Agenda

Dev Basics



20/60

Dev Basics

What would you need to start Building Native Apps??



21/60

Dev Basics


MacOS Device



22/60

Dev Basics


MacOS Device iPhoneDev Center

http://developer.apple.com/iphone/index.actionhttp://developer.apple.com/iphone/index.actionhttp://developer.apple.com/iphone/index.actionhttp://developer.apple.com/iphone/index.action


23/60


24/60

Dev Basics

Objective C

It is a superclass of ANSI C

It brings Object Orientation totraditional ANSI C

It is NOT C++ Objective C++ works with C++



25/60

Dev Basics

Objective C requires Header Files(*.h) and Implementation Files (*.m)

Objective C++ requires Header Files(*.h) and Implementation Files(*.mm)



26/60

Dev Basics

A header le from HelloWorld Project:

//// HelloWorldViewController.h

// HelloWorld//// Created by Luciano Fagundes on 19/08/10.// Copyright Pessoal 2010. All rights reserved.//

#import

@interface HelloWorldViewController : UIViewController {

}



27/60

Dev Basics

#import"HelloWorldViewController.h"

@implementation HelloWorldViewController

- ( id )initWithNibName:( NSString *) nibNameOrNil bundle:(NSBundle*) nibBundleOrNil {

return self;

}- ( void )loadView {}

- ( void )viewDidLoad {[super viewDidLoad];

}

- ( void )didReceiveMemoryWarning {!

[superdidReceiveMemoryWarning];!}

- ( void )viewDidUnload {

}

- ( void )dealloc {[super dealloc];

}

@enddomingo, 22 de agosto de 2010


28/60

Dev Basics

-( id )initWithNibName:(NSString *) nibName

bundle:(NSBundle *) nibBundleOrNil {return self;

}

Object Method in Objective C



29/60

Dev Basics

-

In Java it would be :

public



30/60


31/60

Dev Basics

initWithNibName :bundle :


initWithNibNameBundle



32/60

Dev Basics

(NSString *)nibName(NSBundle *)nibBundle


(String nibName, Bundle nibBundle)



33/60

Dev Basics

{

return self;}


{return self

}domingo, 22 de agosto de 2010


34/60

Dev Basics

Sending a Message to an Object

[receiver doSomething][receiver doThis:this andDoThat:that]

In Java it would be :receiver.doSomething()receiver.DoThisAndDoThat(this,that)



35/60

Agenda





36/60

Agenda




37/60

Demo 1:XCode

Interface Builder



38/60

Agenda





39/60

App Store



40/60

App StoreCreate an Account on the IPhone Developer Program

Build you AppDownload XCode

Develop / Test

Download your Digital Certicate

Sign your App

Distribution Access iTune Connect

Enter all the marketing material for your App, including : MultipleLanguages, price, description, snapshots, target countries, etc

Submit App to Apple for Approval



41/60

App StoreMaintenance

Monitor your Sales Reports from the entire World cia iTunesConnect ( https://itunesconnect.apple.com/WebObjects/iTunesConnect.woa )

Monitor your App reviews (Customer feedback) for the several

different countriesFix Bugs / Evolve the App

Submit updated App to Apple and start all over

GET RICH !!

You will get 70% of the price you have set for your App Another way would be launching free Apps monetized by

Advertisement (iAd, Admob and others)



42/60

App Store Advantages:

World Wide Exposure Very Hot Market for independent

developers

Very quick product cycle Up to the second user feedback



43/60

App Store

Risks:

Brutal Competition (Fast andFlexible) Apps can fade among the others Consumer has total control of the

market; very easy to discard andprovide a bad review for your App



44/60

Image Processing With Quartz



45/60

Showing Images

UIImageView * imgView =

[[UIImageView alloc ] initWithFrame ( 10,10,100,100 )]];UIImage * img =[[UIImage alloc ] initWithURL: ];

imgView.image = img;[img release

];



46/60

Acquiring ImagesUIImagePickerController *ipc =

[[UIImagePickerController alloc] init];

// Get images from the photo library.ipc.delegate = self;ipc.sourceType =

UIImagePickerControllerSourceTypePhotoLibrary;

[self presentModalViewController:ipc animated:YES];



47/60

Receiving Image-(void) imagePickerController:

(UIImagePickerController *)pickerdidFinishPickingMediaWithInfo:

(NSDictionary *)info {[self displayImage:[info objectForKey:

@"UIImagePickerControllerOriginalImage"]];[self dismissModalViewControllerAnimated:

YES];[picker release];

}



48/60

Receiving Image-(void) imagePickerController:

(UIImagePickerController *)pickerdidFinishPickingMediaWithInfo:

(NSDictionary *)info {

[self displayImage:[info objectForKey:@"UIImagePickerControllerOriginalImage"]];

[self dismissModalViewControllerAnimated:

YES];[picker release];

} -(void) imagePickerControllerDidCancel:

(UIImagePickerController *)picker;domingo, 22 de agosto de 2010


49/60


50/60

Drawing //Manually creates a a Graphical Context

int pixelsWide = workArea.size.width;int pixelsHigh = workArea.size.height;

CGContextRef ctx=NULL;CGColorSpaceRef colorSpace;void* bitmapData;int bitmapByteCount;

int bitmapBytesPerRow;// find dimension of the image regardingits bytesbitmapBytesPerRow =(pixelsWide*4);



51/60

Drawing //RGBA !!bitmapByteCount =(bitmapBytesPerRow*pixelsHigh);

//Allocate image buffer

bitmapData=malloc(bitmapByteCount);if(bitmapData==NULL){

fprintf (stderr,"Memorynotallocated!");return NULL;

}

//create RGB color spacecolorSpace=

CGColorSpaceCreateDeviceRGB();domingo, 22 de agosto de 2010


52/60

Drawing

//Create a Ghraphic Context with thejust created buffer

ctx=CGBitmapContextCreate(bitmapData,pixelsWide,pixelsHigh,

8,//bitspercomponenttipliedLast);

bitmapBytesPerRow,colorSpace,kCGImageAlphaPremultipliedlast);



53/60

Drawing // Returns NULLif Context creation failedif(ctx==NULL){ //5

free(bitmapData);} //release color space because it is nolonger needed

CGColorSpaceRelease(colorSpace);

! //Clear drawing area !CGContextClearRect(ctx, workArea);



54/60

Drawing // Create a sample array of values !! NSMutableArray * dataSet =[[NSMutableArray alloc] init];

[dataSet addObject:[NSNumbernumberWithInt:10]];

[dataSet addObject:[NSNumbernumberWithInt:15]];

![dataSet addObject:[NSNumbernumberWithInt:30]];

![dataSet addObject:[NSNumbernumberWithInt:5]]; ![dataSet addObject:[NSNumber

numberWithInt:18]];



55/60

Drawing ! // Create an array of colors for eachpie slice

NSMutableArray * colors =

[[NSMutableArray alloc] init];[colors addObject:[UIColor blueColor]];[colors addObject:[UIColor greenColor]];[colors addObject:[UIColor redColor]];[colors addObject:[UIColor grayColor]];[colors addObject:[UIColor whiteColor]];



56/60

Drawing // sum all values in the arrayfloat total = 0;for ( NSNumber * iTmp in dataSet ){

total+=[iTmp intValue];

}// Plots the Pie Chartfloat startDegree = 0;float endDegree = 0;float radius = workArea.size.width/2;

//Plot Itemsint item;CGContextSetStrokeColorWithColor(ctx,

[UIColor blackColor].CGColor );domingo, 22 de agosto de 2010


57/60

Drawing for(inti=0;i


58/60

Drawing // Create image to be returned from the// Graphical Context

CGImageRef img =CGBitmapContextCreateImage(ctx);

UIImage * ret = [UIImageimageWithCGImage:img]

// Free up all remaining memoryfree(CGBitmapContextGetData(ctx));CGContextRelease(ctx);CGImageRelease(img);return ret;

}



59/60

Exporting to PhotoLibrary

UIImageWriteToSavedPhotosAlbum([imageView image], nil,nil,nil);



60/60

Case of Study Demo 2:

Sample CG Apps

Documents

Mini Curso iPhone