Tag Archives: orbital defense

Orbital Defense II – Update 2



I got a lot done today in my work to update Orbital Defense.

My goal was to get player units working today.  For the basic functionality I really only need one unit in place so I just updated the basic attack unit.

First up I added in the graphics for it.  In the original I wanted the satellites to rotate or at least have some bit of animation.  With LibGDX it’s pretty simple to handle animation so I now have them rotating, which is nice.

One thing I had to fix in the conversion was the placement of satellites.  The coordinate system is different between the standard android canvas and LibGDX.  Basically the Y axis is reversed  in Canvas 0 is at the top, in LibGDX 0 is at the bottom.  I knew this was something to keep an eye out for so as soon as I tested it and saw the results I knew the change I had to make.

2013-02-12bNow that I had satellites placed on the screen I need to get them to move.  Moving something smoothly around a circle takes a bit more code then one might imagine but luckily all the code I had written still worked perfectly.  I needed to make some adjustments based on changes I’ve made to where variables and methods are coming from, but nothing about the calculations needed to change which is always handy.

Since satellites could orbit I figured they should next be able to attack.  Since I have meteors already in place, we have targets for the satellites.  This was code that once I took a look at it I was able to reduce it down to far fewer lines.  The general logic is still the same, i just get where I need to be a lot quicker and removed some of the redundant branches.  Basically it checks to see if it still has a valid target, and if not finds one.  Once a target is found it fires on it if the satellite is ready to fire. My original code for this logic took up about 50 lines, my new code for it takes up 20 and performs the same job in a more efficient way.

Part of attacking is that you want to see it on the screen, so I had to work out some better code for that.  Previously I only had the attacks on screen for a frame or two, but with faster running frames this doesn’t really work so it’s all time based now.  It is still only on the screen for 0.15 seconds but it is enough that you see it happening.  I will probably adjust that number further as I work on things more.

Once I had code for satellites attacking in place I could just copy the same code for enemy attacks. Even though I don’t have any enemies that shoot in place yet, the logic stays essentially the same.

I do have meteors though, and the way that those attack is by hitting things, so I needed to put collision detection in place.  One thing that is nice for simple collision detection in this game is that everything is more or less bounded by a circle.  What makes that simple is that all you need to do to check for a collision is find out the distance between the center of the two objects and see if it is smaller than the radius of the two objects added together.  Everything in the game has an impact damage assigned to it so I just subtract from the health of both objects.  Of course I couldn’t leave things that simple though and I currently have two special types of satellites that don’t obey the same collision rules.  The easy one is the Bulldozer satellite, specifically designed to take out meteors and other objects.  It takes no damage from impact.  The more difficult one is the Bouncer satellite.  Bouncer satellites deflect meteors and neither takes damage.  Handling these requires figuring out tangents and reflecting angles and all that jazz, which I had figured out previously and have code for.  Right now I’m hoping my old code will work fine, as soon as Bouncers are added back in I specifically need to test them.

After all this added code I can then just simply check the health of all allied and enemy units and destroy the ones below 0, with a little quick explosion that I think I want to expand later on.

Basic game play is more or less in place with all these additions.  What I really need to do next is add information to the screen.  You currently do not know planet health or current resources, vitally important data to actually know how the game is going and what actions you can take in the game. I think I will work on those tomorrow as well as start working on the main menu screen and other non-game screens, which will all be new with the change to LibGDX.

In completely unrelated news, my Flynt Flossy shirt came in yesterday which is awesome.  Here is Turquoise Jeep’s latest video:

Orbital Defense II In Progress

So I kind of started One Game a Month last month, though my first game didn’t really fully come together what with being sick and having a prototype to build for actual work.  For February I’ve decided to update an old game of mine, Orbital Defense and making Orbital Defense II.

ODII 2013-02-11a

The first order of business for the update is that I’m converting it over to use LibGDX.  This is the framework I’ve used for my later games.  I think it will help it run better and just look nicer overall.  I’m still in this stage of the process, to the right is a screenshot of the current progress.  The star field is twinkling, the Earth and the orbital zone are there and meteors are being created and run across the screen.

I still have a long ways to go, I need to add in all the other units, take care of unit collision and attacks, add the info bar and unit selection bar, etc.  There is plenty to do here to have it converted and ready for the next step.

The next step will be updates.  Since this is a tower defense type of game one big one I want in there are upgrades for satellites.  This is really something I should have had in the first version but I just didn’t have a good plan in mind for how to go about it.  I feel like I do now and it will work out nicely.  I also want to add more satellites for the player to use, and perhaps a selection screen to decide which satellites you use.  I want it to also have levels and more wave style gameplay for enemies instead of the random enemies it currently throws at you based on difficulty level.  I’d like to do something more with the graphics as well, at least update how it looks so units are quite so cheap looking.   Overall I just want to make it a better game that continues to be fun.

That is a lot to do, and the way I work I’m not sure it will be done this month so this might be an entry for another month.  Either way, this is something I’ve decided to do so hopefully I end up with something interesting.

I am a game developer

So I’ve started developing Android games as I probably mentioned somewhere before.  I have 2 on the market so far and am working on a 3rd.

My first game is called Tile Slider, though I’ve heard that’s not that great a name.  You are given a board with various pairs of colored tiles on it and you have to slide them together to remove them from the board.  If you are able to remove all of them from the board you move on to the next level.  You are given a specific number of moves to do it in on each board and if you run out of moves you lose.  New tiles can be added to the board if you make too many moves between matching as well so you have to be strategic about how you move them around.

Tile Slider hasn’t been downloaded a ton, it just went over 500 in the last few days.  I’m thinking about going back and revisiting it to see if what more I can add to it to try and increase interest in it.

My second game is Orbital Defense.  This game is a tower defense style game with the twist being that the “towers” you build for defense are satellites that orbit the Earth.  Meteors come flying in to strike the Earth and you want to shoot them down before they do.  There are also enemy ships that come in and shoot back at your satellites to try and destroy them.  There are several different types of satellites from the basic attack satellites to the bulldozer satellite that doesn’t take damage from meteor hits to the sentry that will stay in one place to fire on meteors and enemy ships.

This game has done better, it should go over 5000 downloads today so that is rad.  I receive more feedback on it as well so I’m getting plenty of good ideas of where to expand the game.  I don’t feel like this one is completely finished yet so I do regularly try to work on updates for it.

The third game is currently in progress and is called Galaxy Destroyer.  Even as I’m developing it I’m adjusting what I want the game to be so none of this is set in stone yet.  You are given a galaxy filled with stars and the ability to age one star and to grow one star.  The stars are modeled roughly after actual stellar evolution so as they age they will become giants and white dwarfs and so forth and the biggest of stars will even go supernova or hypernova.  Certain classes of stars can also be inhabited and spread their civilizations to other stars as well.  I think the general goal of the game is going to be to destroy as many civilizations as possible in the galaxy by inducing stars to go nova.  I want to track things like stars destroyed, civilizations destroyed, novas, etc. per galaxy so that those can be kind of sub goals of the game to get those higher and higher.

My plan for this game is to charge for it, I’m not sure yet.  I will have a free “lite” version that will include one or two levels while the full version will include however many levels I make and a random galaxy feature.  I put some solid work in every day and I think Galaxy Destroyer can be out by the end of October or early November.

It is my hope that I can start making enough money off of developing these games and other apps to just keep doing this.  We’ll see how it works out but I think I have a good start and plenty of time left before I absolutely have to get a job to get this rolling.

If you are interested there is more information on all of these at the kyrutech website.

So what’s going on with me

Hola amigos! I know it’s been a long time since I’ve rapped at ya but I’ve been kicking tires and lighting fires. Okay maybe none of that, for some reason I just felt like opening my post Jim Anchower style.

So I haven’t worked since the end of April and it’s been fantastic. I’ve had the first real summer I could enjoy worry-free in about 15 years. I’ve spent far too many days at the beach getting more sun then I have in the past 10 years combined. It hasn’t been all goofing off though, I’ve been working on writing Android programs as well. Under the company name kyrutech I’ve released one game, Tile Slider, and have another on the way, Orbital Defense. Tile Slider was released for free but I’m hoping to be able to put a small charge on the full version of Orbital Defense, with a lite free version also available to get people interested. We’ll see how that pans out.

I’m not expecting to make much money off of this so I am looking for other work. Leaving Minnesota is at the top of my priority list when it comes to looking for jobs, I’m mainly focusing on the Boston area and Milwaukee. I’ve just recently started looking even halfway seriously so we’ll see how it goes. I still get calls almost every day of people trying to get me into jobs up here in Minnesota even though I don’t list that as a place I want to work on any of my online resumes.

I don’t know if there is much more to say, I just kind of felt like posting something up on here. I always think I’d like to update this more often with interesting content but I just never really do. Oh well, all is good, I am happy with things right now.