Obvoiusly, there’s still stuff to do to make it look good, like label the window, but it has the stuff to start.

I am now back to working on the project that’s paying some bills, so I’ll be laying this aside for a bit again. As usual, it’s all available on Github.

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Development, imGravityGame, imSimReal, Mac OS X

I need to create a sample application that puts it to use as is to show how to use it.

I have the Acceptance Test framework working for all tests, and they all pass. First image is the top level menu:

This image displays the success of the PointObject tests:

Much of the activity involved refactoring to simplify the code yet still work correctly.

Two remaining activities:

• Create a Framework to work with MacOS X projects
• Create a test application, either iPhone or Mac, to demonstrate use of the framework

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Development, imSimReal, iPhone, Mac OS X

The test framework is built on a UITableView in a NavigationView. The top table contains a list of the sets of tests available, like so:

Each cell is a test suite. Touching the cell causes the suite to run. If it passes, it turns green. If it fails, it turns red. And if it is mixed results, it turns yellow. A gray cell is one that has not been run.

If you select the detail view button on the right side of the cell, the detailed table view opens:

This display shows the Gravity test suite, with all the tests having passed. I need another layer, to provide details of the test when you touch the detailed button on the cells at this level, but I haven’t added that part yet. The code for all this is available in the imSimReal package in gitHub.

I am reworking the IMSRPointObject class, removing the NSDictionary that contained all the data, and instead putting the data at the top level. So far it hasn’t been completed, but should be soon. I also plan to add a new Xcode project that builds a Framework for OS X. This framework will support garbage collection.

After that, I’m thinking I need to make an example application using the IMSRGravity and IMSRPointObject classes before moving on to the next piece of functionality.

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Development, imSimReal, iPhone, Mac OS X

As you can see, the instructions are not helpful. Here is the About box:

This box contains enough text to require a scrolling box.

//
// FlipsideViewController.h
// imGravityGame
//
// Created by John Ahrens on 1/9/09.
// Copyright John Ahrens, LLC 2009. All rights reserved.
//

@end


Also of interest at this time is the -(IBAction)buttonPressed: (id)sender method:

- (IBAction)buttonPressed: (id)sender
{
NSString *title = [sender currentTitle];
NSBundle *bundle = [NSBundle mainBundle];
NSString *file;

[alert release];
}


Note that it determines which button was pressed, then gets the appropriate file and opens the alert box. The message in the alert box is the contents of the file.

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Development, imGravityGame, iPhone

The two buttons turn blue when touched, but they don’t actually do anything yet. That’s the part I have to figure out next. How to best bring up a window that shows the instructions for how to play, and an About box with the credits.

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Development, imGravityGame, iPhone

Update 3:49 MST: Here’s an image of the working picker:

Update 5:00 MST: Added the slider to set the velocity of the sliding box moving across the base to catch the falling ball. Here’s an image:

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Development, imGravityGame, iPhone

In short, I added the test case - (void)testGetGravityForSelectedBodyWithBadBodyName:. The primary plan here was to make sure that we can deal with the case where the selectedBody in IMSRGravity is not a member of the bodyGravity NSDictionary.

A look at the test:

- (void)testGetGravityForSelectedBodyWithBadBodyName
{
NSString *body = @"test";
IMSRGravity *gravity = [[IMSRGravity alloc] init];
STAssertNotNil(gravity, @"IMSRGravity not created with default initializer");

[body release];
[gravity release];
}

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Development, imSimReal

There is also a new initializer -initWithBody:

- (id)initWithBody: (NSString *)body
{
if (![super init])
{
return nil;
}

return self;
}

Note that the initializer takes an NSString object that provides the key into the bodyGravity NSDictionary. With this change, the default -init: method changes to call -initWithBody: with Earth as the default selectedBody:

- (id)init
{
return [self initWithBody: @"Earth"]; // Use Earth in the absence of other values
}

The new -gravityForSelectedBody: method returns 0.0 if the selectedBody is nil, otherwise it gets accesses the bodyGravity NSDictionary to get the gravity value for the selectedBody key.

At this point there is some error handling missing for the case where the selectedBody does not match any element in the NSDictionary.

- (double)gravityForSelectedBody
{
if (selectedBody == nil)
{
return 0.0;
}

NSNumber *gravity = [bodyGravity valueForKey: selectedBody];
return [gravity doubleValue];
}

The current class declaration looks like:

@interface IMSRGravity : NSObject
{
NSDictionary *bodyGravity;
NSString *selectedBody;
}

@end

This is available from GitHub as tag 0.1RC3, and as a disk image at the downloads page.

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Development, imSimReal

gravity = [IMSRGravity alloc] init];

In -viewDidLoad:, I construct an NSArray using the keys from gravity:

planets = [gravity allKeys];

The FlipSide implements two data source methods:

-numberOfComponentsInPickerView:

which returns 1, and

-pickerView:numberOfRowsInComponent:

which returns the number of planets in the gravity:

return [planets count];

It also implements one UIPickerViewDelegateMethod

:

-pickerView:titleForRow:forComponent:

which returns the name of the planet indicated by the NSInteger row

return [planets objectAtIndex: row];

At this point I realized that IMSRGravity needs a place to store the currently selected planet, so I will be going back to imSimReal and preparing 0.1RC3 soon (like tomorrow, hopefully).

Here is the current status of FlipSideViewController class:

@interface FlipsideViewController : UIViewController

{
IBOutlet UIPickerView *planetView;
IMSRGravity *gravity;
NSArray *planets;
}

@property (nonatomic, retain) UIPickerView *planetView;
@property (nonatomic, retain) IMSRGravity *gravity;
@property (nonatomic, retain) NSArray *planets;

@end

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imSimReal, iPhone, imGravityGame

This code is currently only being used in an iPhone application, so the fact that the project file is an application file is irrelevant. That was the easiest way to get the tests built into the project quickly, so I went with it. I should point out that the project file, if you build the Unit Test target, builds the imSimReal code and the OCUnit test code, then executes the tests, and only reports success if all the tests pass.

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imSimReal, iPhone